這裡暫時隻截了個圖，實際上是一個騎車的動畫。
實作原理及代碼：
1.首先導入module到項目中去，并且添加為依賴
2.在library中src/main/java/res/drawable 目錄下添加一個動畫圖檔refresh_anim.xml
<?xml version="1.0" encoding="utf-8"?>
<!--這裡的oneshot為false是讓動畫無限循環，如果隻執行一遍動畫可以設定為true-->
<animation-list
xmlns:android="http://schemas.android.com/apk/res/android"
android:oneshot="false"
>
<item android:drawable="@drawable/loading1" android:duration="150"></item>
<item android:drawable="@drawable/loading2" android:duration="150"></item>
<item android:drawable="@drawable/loading3" android:duration="150"></item>
<item android:drawable="@drawable/loading4" android:duration="150"></item>
<item android:drawable="@drawable/loading5" android:duration="150"></item>
<item android:drawable="@drawable/loading6" android:duration="150"></item>
</animation-list>
3.在library中src/main/java/res/layout目錄下添加一個重新整理布局pull_refersh_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android">
<FrameLayout
android:id="@+id/fl_inner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal">
<!--預設顯示第一張圖檔-->
<ImageView
android:id="@+id/pull_to_refresh_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:scaleX="0.7"
android:scaleY="0.7"
android:src="@drawable/loading1"
/>
</FrameLayout>
</FrameLayout>
</merge>
4.在library中src/main/java/com.handmark.pulltorefresh.library.internal/internal目錄下建立一個類MyLoadingLayout
package com.handmark.pulltorefresh.library.internal;
/**
* Created by Attrack on 2017/10/12.
*/
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.AnimationDrawable;
import android.graphics.drawable.Drawable;
import android.view.View;
import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;
import com.handmark.pulltorefresh.library.PullToRefreshBase.Orientation;
import com.handmark.pulltorefresh.library.R;
/**
* @author wuwenjie
* @date 2015/1/8
* @desc 幀動畫加載布局
*/
public class MyLoadingLayout extends LoadingLayout {
private AnimationDrawable animationDrawable;
public MyLoadingLayout(Context context, Mode mode,
Orientation scrollDirection, TypedArray attrs) {
super(context, mode, scrollDirection, attrs);
// 初始化
mHeaderImage.setImageResource(R.drawable.refresh_anim);
animationDrawable = (AnimationDrawable) mHeaderImage.getDrawable();
}
// 預設圖檔
@Override
protected int getDefaultDrawableResId() {
return R.drawable.loading1;
}
@Override
protected void onLoadingDrawableSet(Drawable imageDrawable) {
// NO-OP
}
@Override
protected void onPullImpl(float scaleOfLayout) {
// NO-OP
}
// 下拉以重新整理
@Override
protected void pullToRefreshImpl() {
// NO-OP
}
// 正在重新整理時回調
@Override
protected void refreshingImpl() {
// 播放幀動畫
animationDrawable.start();
}
// 釋放以重新整理
@Override
protected void releaseToRefreshImpl() {
// NO-OP
}
// 重新設定
@Override
protected void resetImpl() {
mHeaderImage.setVisibility(View.VISIBLE);
mHeaderImage.clearAnimation();
}
}
5.修改src/com/handmark/pulltorefresh/library/internal/LoadingLayout.java源碼
/*******************************************************************************
* Copyright 2011, 2012 Chris Banes.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*******************************************************************************/
package com.handmark.pulltorefresh.library.internal;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.TypedArray;
import android.graphics.Typeface;
import android.graphics.drawable.AnimationDrawable;
import android.graphics.drawable.Drawable;
import android.text.TextUtils;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Interpolator;
import android.view.animation.LinearInterpolator;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;
import com.handmark.pulltorefresh.library.ILoadingLayout;
import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;
import com.handmark.pulltorefresh.library.PullToRefreshBase.Orientation;
import com.handmark.pulltorefresh.library.R;
@SuppressLint("ViewConstructor")
public abstract class LoadingLayout extends FrameLayout implements ILoadingLayout {
static final String LOG_TAG = "PullToRefresh-LoadingLayout";
static final Interpolator ANIMATION_INTERPOLATOR = new LinearInterpolator();
private FrameLayout mInnerLayout;
protected final ImageView mHeaderImage;
protected final ProgressBar mHeaderProgress;
private boolean mUseIntrinsicAnimation;
private final TextView mHeaderText;
private final TextView mSubHeaderText;
protected final Mode mMode;
protected final Orientation mScrollDirection;
private CharSequence mPullLabel;
private CharSequence mRefreshingLabel;
private CharSequence mReleaseLabel;
public LoadingLayout(Context context, final Mode mode, final Orientation scrollDirection, TypedArray attrs) {
super(context);
mMode = mode;
mScrollDirection = scrollDirection;
switch (scrollDirection) {
case HORIZONTAL:
LayoutInflater.from(context).inflate(R.layout.pull_to_refresh_header_horizontal, this);
break;
case VERTICAL:
default:
/**
* 修改 1
*/
//如果是下拉重新整理調用動畫布局
if (mMode == Mode.PULL_FROM_START)
LayoutInflater.from(context).inflate(R.layout.pull_to_refresh_header_simple, this);
else
// 如果是上拉加載調用其它布局
LayoutInflater.from(context).inflate(R.layout.pull_to_refresh_header_vertical, this);
break;
}
mInnerLayout = (FrameLayout) findViewById(R.id.fl_inner);
mHeaderText = (TextView) mInnerLayout.findViewById(R.id.pull_to_refresh_text);
mHeaderProgress = (ProgressBar) mInnerLayout.findViewById(R.id.pull_to_refresh_progress);
mSubHeaderText = (TextView) mInnerLayout.findViewById(R.id.pull_to_refresh_sub_text);
mHeaderImage = (ImageView) mInnerLayout.findViewById(R.id.pull_to_refresh_image);
FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) mInnerLayout.getLayoutParams();
switch (mode) {
case PULL_FROM_END:
lp.gravity = scrollDirection == Orientation.VERTICAL ? Gravity.TOP : Gravity.LEFT;
// Load in labels
mPullLabel = context.getString(R.string.pull_to_refresh_from_bottom_pull_label);
mRefreshingLabel = context.getString(R.string.pull_to_refresh_from_bottom_refreshing_label);
mReleaseLabel = context.getString(R.string.pull_to_refresh_from_bottom_release_label);
break;
case PULL_FROM_START:
default:
lp.gravity = scrollDirection == Orientation.VERTICAL ? Gravity.BOTTOM : Gravity.RIGHT;
// Load in labels
mPullLabel = context.getString(R.string.pull_to_refresh_pull_label);
mRefreshingLabel = context.getString(R.string.pull_to_refresh_refreshing_label);
mReleaseLabel = context.getString(R.string.pull_to_refresh_release_label);
break;
}
/**
* 修改 2
*/
if (mMode != Mode.PULL_FROM_START) {
if (attrs.hasValue(R.styleable.PullToRefresh_ptrHeaderBackground)) {
Drawable background = attrs.getDrawable(R.styleable.PullToRefresh_ptrHeaderBackground);
if (null != background) {
ViewCompat.setBackground(this, background);
}
}
if (attrs.hasValue(R.styleable.PullToRefresh_ptrHeaderTextAppearance)) {
TypedValue styleID = new TypedValue();
attrs.getValue(R.styleable.PullToRefresh_ptrHeaderTextAppearance, styleID);
setTextAppearance(styleID.data);
}
if (attrs.hasValue(R.styleable.PullToRefresh_ptrSubHeaderTextAppearance)) {
TypedValue styleID = new TypedValue();
attrs.getValue(R.styleable.PullToRefresh_ptrSubHeaderTextAppearance, styleID);
setSubTextAppearance(styleID.data);
}
// Text Color attrs need to be set after TextAppearance attrs
if (attrs.hasValue(R.styleable.PullToRefresh_ptrHeaderTextColor)) {
ColorStateList colors = attrs.getColorStateList(R.styleable.PullToRefresh_ptrHeaderTextColor);
if (null != colors) {
setTextColor(colors);
}
}
if (attrs.hasValue(R.styleable.PullToRefresh_ptrHeaderSubTextColor)) {
ColorStateList colors = attrs.getColorStateList(R.styleable.PullToRefresh_ptrHeaderSubTextColor);
if (null != colors) {
setSubTextColor(colors);
}
}
}
// Try and get defined drawable from Attrs
Drawable imageDrawable = null;
if (attrs.hasValue(R.styleable.PullToRefresh_ptrDrawable)) {
imageDrawable = attrs.getDrawable(R.styleable.PullToRefresh_ptrDrawable);
}
// Check Specific Drawable from Attrs, these overrite the generic
// drawable attr above
switch (mode) {
case PULL_FROM_START:
default:
if (attrs.hasValue(R.styleable.PullToRefresh_ptrDrawableStart)) {
imageDrawable = attrs.getDrawable(R.styleable.PullToRefresh_ptrDrawableStart);
} else if (attrs.hasValue(R.styleable.PullToRefresh_ptrDrawableTop)) {
Utils.warnDeprecation("ptrDrawableTop", "ptrDrawableStart");
imageDrawable = attrs.getDrawable(R.styleable.PullToRefresh_ptrDrawableTop);
}
break;
case PULL_FROM_END:
if (attrs.hasValue(R.styleable.PullToRefresh_ptrDrawableEnd)) {
imageDrawable = attrs.getDrawable(R.styleable.PullToRefresh_ptrDrawableEnd);
} else if (attrs.hasValue(R.styleable.PullToRefresh_ptrDrawableBottom)) {
Utils.warnDeprecation("ptrDrawableBottom", "ptrDrawableEnd");
imageDrawable = attrs.getDrawable(R.styleable.PullToRefresh_ptrDrawableBottom);
}
break;
}
// If we don't have a user defined drawable, load the default
if (null == imageDrawable) {
imageDrawable = context.getResources().getDrawable(getDefaultDrawableResId());
}
// Set Drawable, and save width/height
setLoadingDrawable(imageDrawable);
reset();
}
public final void setHeight(int height) {
ViewGroup.LayoutParams lp = (ViewGroup.LayoutParams) getLayoutParams();
lp.height = height;
requestLayout();
}
public final void setWidth(int width) {
ViewGroup.LayoutParams lp = (ViewGroup.LayoutParams) getLayoutParams();
lp.width = width;
requestLayout();
}
public final int getContentSize() {
switch (mScrollDirection) {
case HORIZONTAL:
return mInnerLayout.getWidth();
case VERTICAL:
default:
return mInnerLayout.getHeight();
}
}
public final void hideAllViews() {
/**
* 修改 3
*/
if (mMode != Mode.PULL_FROM_START) {
if (View.VISIBLE == mHeaderText.getVisibility()) {
mHeaderText.setVisibility(View.INVISIBLE);
}
if (View.VISIBLE == mHeaderProgress.getVisibility()) {
mHeaderProgress.setVisibility(View.INVISIBLE);
}
if (View.VISIBLE == mHeaderImage.getVisibility()) {
mHeaderImage.setVisibility(View.INVISIBLE);
}
if (View.VISIBLE == mSubHeaderText.getVisibility()) {
mSubHeaderText.setVisibility(View.INVISIBLE);
}
}
}
public final void onPull(float scaleOfLayout) {
if (!mUseIntrinsicAnimation) {
onPullImpl(scaleOfLayout);
}
}
public final void pullToRefresh() {
/**
* 修改 4
*/
if (mMode != Mode.PULL_FROM_START) {
if (null != mHeaderText) {
mHeaderText.setText(mPullLabel);
}
}
// Now call the callback
pullToRefreshImpl();
}
public final void refreshing() {
if (null != mHeaderText) {
mHeaderText.setText(mRefreshingLabel);
}
if (mUseIntrinsicAnimation) {
((AnimationDrawable) mHeaderImage.getDrawable()).start();
} else {
// Now call the callback
refreshingImpl();
}
/**
* 修改 5
*/
if (mMode != Mode.PULL_FROM_START) {
if (null != mSubHeaderText) {
mSubHeaderText.setVisibility(View.GONE);
}
}
}
public final void releaseToRefresh() {
/**
* 修改 6
*/
if (mMode != Mode.PULL_FROM_START) {
if (null != mHeaderText) {
mHeaderText.setText(mReleaseLabel);
}
}
// Now call the callback
releaseToRefreshImpl();
}
public final void reset() {
if (null != mHeaderText) {
mHeaderText.setText(mPullLabel);
}
mHeaderImage.setVisibility(View.VISIBLE);
if (mUseIntrinsicAnimation) {
((AnimationDrawable) mHeaderImage.getDrawable()).stop();
} else {
// Now call the callback
resetImpl();
}
/**
* 修改 7
*/
if (mMode != Mode.PULL_FROM_START) {
if (null != mSubHeaderText) {
if (TextUtils.isEmpty(mSubHeaderText.getText())) {
mSubHeaderText.setVisibility(View.GONE);
} else {
mSubHeaderText.setVisibility(View.VISIBLE);
}
}
}
}
@Override
public void setLastUpdatedLabel(CharSequence label) {
// setSubHeaderText(label);
}
public final void setLoadingDrawable(Drawable imageDrawable) {
// Set Drawable
mHeaderImage.setImageDrawable(imageDrawable);
mUseIntrinsicAnimation = (imageDrawable instanceof AnimationDrawable);
// Now call the callback
onLoadingDrawableSet(imageDrawable);
}
public void setPullLabel(CharSequence pullLabel) {
mPullLabel = pullLabel;
}
public void setRefreshingLabel(CharSequence refreshingLabel) {
mRefreshingLabel = refreshingLabel;
}
public void setReleaseLabel(CharSequence releaseLabel) {
mReleaseLabel = releaseLabel;
}
@Override
public void setTextTypeface(Typeface tf) {
mHeaderText.setTypeface(tf);
}
public final void showInvisibleViews() {
/**
* 修改 8
*/
if (mMode != Mode.PULL_FROM_START) {
if (View.INVISIBLE == mHeaderText.getVisibility()) {
mHeaderText.setVisibility(View.VISIBLE);
}
if (View.INVISIBLE == mHeaderProgress.getVisibility()) {
mHeaderProgress.setVisibility(View.VISIBLE);
}
if (View.INVISIBLE == mHeaderImage.getVisibility()) {
mHeaderImage.setVisibility(View.VISIBLE);
}
if (View.INVISIBLE == mSubHeaderText.getVisibility()) {
mSubHeaderText.setVisibility(View.VISIBLE);
}
}
}
/**
* Callbacks for derivative Layouts
*/
protected abstract int getDefaultDrawableResId();
protected abstract void onLoadingDrawableSet(Drawable imageDrawable);
protected abstract void onPullImpl(float scaleOfLayout);
protected abstract void pullToRefreshImpl();
protected abstract void refreshingImpl();
protected abstract void releaseToRefreshImpl();
protected abstract void resetImpl();
private void setSubHeaderText(CharSequence label) {
if (null != mSubHeaderText) {
if (TextUtils.isEmpty(label)) {
mSubHeaderText.setVisibility(View.GONE);
} else {
mSubHeaderText.setText(label);
// Only set it to Visible if we're GONE, otherwise VISIBLE will
// be set soon
if (View.GONE == mSubHeaderText.getVisibility()) {
mSubHeaderText.setVisibility(View.VISIBLE);
}
}
}
}
private void setSubTextAppearance(int value) {
if (null != mSubHeaderText) {
mSubHeaderText.setTextAppearance(getContext(), value);
}
}
private void setSubTextColor(ColorStateList color) {
if (null != mSubHeaderText) {
mSubHeaderText.setTextColor(color);
}
}
private void setTextAppearance(int value) {
if (null != mHeaderText) {
mHeaderText.setTextAppearance(getContext(), value);
}
if (null != mSubHeaderText) {
mSubHeaderText.setTextAppearance(getContext(), value);
}
}
private void setTextColor(ColorStateList color) {
if (null != mHeaderText) {
mHeaderText.setTextColor(color);
}
if (null != mSubHeaderText) {
mSubHeaderText.setTextColor(color);
}
}
}
6.
/*******************************************************************************
* Copyright 2011, 2012 Chris Banes.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*******************************************************************************/
package com.handmark.pulltorefresh.library;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.os.Bundle;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.Interpolator;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import com.handmark.pulltorefresh.library.internal.FlipLoadingLayout;
import com.handmark.pulltorefresh.library.internal.LoadingLayout;
import com.handmark.pulltorefresh.library.internal.RotateLoadingLayout;
import com.handmark.pulltorefresh.library.internal.TweenAnimLoadingLayout;
import com.handmark.pulltorefresh.library.internal.Utils;
import com.handmark.pulltorefresh.library.internal.ViewCompat;
public abstract class PullToRefreshBase<T extends View> extends LinearLayout implements IPullToRefresh<T> {
// ===========================================================
// Constants
// ===========================================================
static final boolean DEBUG = true;
static final boolean USE_HW_LAYERS = false;
static final String LOG_TAG = "PullToRefresh";
static final float FRICTION = f;
public static final int SMOOTH_SCROLL_DURATION_MS = ;
public static final int SMOOTH_SCROLL_LONG_DURATION_MS = ;
static final int DEMO_SCROLL_INTERVAL = ;
static final String STATE_STATE = "ptr_state";
static final String STATE_MODE = "ptr_mode";
static final String STATE_CURRENT_MODE = "ptr_current_mode";
static final String STATE_SCROLLING_REFRESHING_ENABLED = "ptr_disable_scrolling";
static final String STATE_SHOW_REFRESHING_VIEW = "ptr_show_refreshing_view";
static final String STATE_SUPER = "ptr_super";
// ===========================================================
// Fields
// ===========================================================
private int mTouchSlop;
private float mLastMotionX, mLastMotionY;
private float mInitialMotionX, mInitialMotionY;
private boolean mIsBeingDragged = false;
private State mState = State.RESET;
private Mode mMode = Mode.getDefault();
private Mode mCurrentMode;
T mRefreshableView;
private FrameLayout mRefreshableViewWrapper;
private boolean mShowViewWhileRefreshing = true;
private boolean mScrollingWhileRefreshingEnabled = false;
private boolean mFilterTouchEvents = true;
private boolean mOverScrollEnabled = true;
private boolean mLayoutVisibilityChangesEnabled = true;
private Interpolator mScrollAnimationInterpolator;
private AnimationStyle mLoadingAnimationStyle = AnimationStyle.getDefault();
private LoadingLayout mHeaderLayout;
private LoadingLayout mFooterLayout;
private OnRefreshListener<T> mOnRefreshListener;
private OnRefreshListener2<T> mOnRefreshListener2;
private OnPullEventListener<T> mOnPullEventListener;
private SmoothScrollRunnable mCurrentSmoothScrollRunnable;
// ===========================================================
// Constructors
// ===========================================================
public PullToRefreshBase(Context context) {
super(context);
init(context, null);
}
public PullToRefreshBase(Context context, AttributeSet attrs) {
super(context, attrs);
init(context, attrs);
}
public PullToRefreshBase(Context context, Mode mode) {
super(context);
mMode = mode;
init(context, null);
}
public PullToRefreshBase(Context context, Mode mode, AnimationStyle animStyle) {
super(context);
mMode = mode;
mLoadingAnimationStyle = animStyle;
init(context, null);
}
@Override
public void addView(View child, int index, ViewGroup.LayoutParams params) {
if (DEBUG) {
Log.d(LOG_TAG, "addView: " + child.getClass().getSimpleName());
}
final T refreshableView = getRefreshableView();
if (refreshableView instanceof ViewGroup) {
((ViewGroup) refreshableView).addView(child, index, params);
} else {
throw new UnsupportedOperationException("Refreshable View is not a ViewGroup so can't addView");
}
}
@Override
public final boolean demo() {
if (mMode.showHeaderLoadingLayout() && isReadyForPullStart()) {
smoothScrollToAndBack(-getHeaderSize() * );
return true;
} else if (mMode.showFooterLoadingLayout() && isReadyForPullEnd()) {
smoothScrollToAndBack(getFooterSize() * );
return true;
}
return false;
}
@Override
public final Mode getCurrentMode() {
return mCurrentMode;
}
@Override
public final boolean getFilterTouchEvents() {
return mFilterTouchEvents;
}
@Override
public final ILoadingLayout getLoadingLayoutProxy() {
return getLoadingLayoutProxy(true, true);
}
@Override
public final ILoadingLayout getLoadingLayoutProxy(boolean includeStart, boolean includeEnd) {
return createLoadingLayoutProxy(includeStart, includeEnd);
}
@Override
public final Mode getMode() {
return mMode;
}
@Override
public final T getRefreshableView() {
return mRefreshableView;
}
@Override
public final boolean getShowViewWhileRefreshing() {
return mShowViewWhileRefreshing;
}
@Override
public final State getState() {
return mState;
}
/**
* @deprecated See {@link #isScrollingWhileRefreshingEnabled()}.
*/
public final boolean isDisableScrollingWhileRefreshing() {
return !isScrollingWhileRefreshingEnabled();
}
@Override
public final boolean isPullToRefreshEnabled() {
return mMode.permitsPullToRefresh();
}
@Override
public final boolean isPullToRefreshOverScrollEnabled() {
return VERSION.SDK_INT >= VERSION_CODES.GINGERBREAD && mOverScrollEnabled
&& OverscrollHelper.isAndroidOverScrollEnabled(mRefreshableView);
}
@Override
public final boolean isRefreshing() {
return mState == State.REFRESHING || mState == State.MANUAL_REFRESHING;
}
@Override
public final boolean isScrollingWhileRefreshingEnabled() {
return mScrollingWhileRefreshingEnabled;
}
@Override
public final boolean onInterceptTouchEvent(MotionEvent event) {
if (!isPullToRefreshEnabled()) {
return false;
}
final int action = event.getAction();
if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) {
mIsBeingDragged = false;
return false;
}
if (action != MotionEvent.ACTION_DOWN && mIsBeingDragged) {
return true;
}
switch (action) {
case MotionEvent.ACTION_MOVE: {
// If we're refreshing, and the flag is set. Eat all MOVE events
if (!mScrollingWhileRefreshingEnabled && isRefreshing()) {
return true;
}
if (isReadyForPull()) {
final float y = event.getY(), x = event.getX();
final float diff, oppositeDiff, absDiff;
// We need to use the correct values, based on scroll
// direction
switch (getPullToRefreshScrollDirection()) {
case HORIZONTAL:
diff = x - mLastMotionX;
oppositeDiff = y - mLastMotionY;
break;
case VERTICAL:
default:
diff = y - mLastMotionY;
oppositeDiff = x - mLastMotionX;
break;
}
absDiff = Math.abs(diff);
if (absDiff > mTouchSlop && (!mFilterTouchEvents || absDiff > Math.abs(oppositeDiff))) {
if (mMode.showHeaderLoadingLayout() && diff >= f && isReadyForPullStart()) {
mLastMotionY = y;
mLastMotionX = x;
mIsBeingDragged = true;
if (mMode == Mode.BOTH) {
mCurrentMode = Mode.PULL_FROM_START;
}
} else if (mMode.showFooterLoadingLayout() && diff <= -f && isReadyForPullEnd()) {
mLastMotionY = y;
mLastMotionX = x;
mIsBeingDragged = true;
if (mMode == Mode.BOTH) {
mCurrentMode = Mode.PULL_FROM_END;
}
}
}
}
break;
}
case MotionEvent.ACTION_DOWN: {
if (isReadyForPull()) {
mLastMotionY = mInitialMotionY = event.getY();
mLastMotionX = mInitialMotionX = event.getX();
mIsBeingDragged = false;
}
break;
}
}
return mIsBeingDragged;
}
@Override
public final void onRefreshComplete() {
if (isRefreshing()) {
setState(State.RESET);
}
}
@Override
public final boolean onTouchEvent(MotionEvent event) {
if (!isPullToRefreshEnabled()) {
return false;
}
// If we're refreshing, and the flag is set. Eat the event
if (!mScrollingWhileRefreshingEnabled && isRefreshing()) {
return true;
}
if (event.getAction() == MotionEvent.ACTION_DOWN && event.getEdgeFlags() != ) {
return false;
}
switch (event.getAction()) {
case MotionEvent.ACTION_MOVE: {
if (mIsBeingDragged) {
mLastMotionY = event.getY();
mLastMotionX = event.getX();
pullEvent();
return true;
}
break;
}
case MotionEvent.ACTION_DOWN: {
if (isReadyForPull()) {
mLastMotionY = mInitialMotionY = event.getY();
mLastMotionX = mInitialMotionX = event.getX();
return true;
}
break;
}
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP: {
if (mIsBeingDragged) {
mIsBeingDragged = false;
if (mState == State.RELEASE_TO_REFRESH
&& (null != mOnRefreshListener || null != mOnRefreshListener2)) {
setState(State.REFRESHING, true);
return true;
}
// If we're already refreshing, just scroll back to the top
if (isRefreshing()) {
smoothScrollTo();
return true;
}
// If we haven't returned by here, then we're not in a state
// to pull, so just reset
setState(State.RESET);
return true;
}
break;
}
}
return false;
}
public final void setScrollingWhileRefreshingEnabled(boolean allowScrollingWhileRefreshing) {
mScrollingWhileRefreshingEnabled = allowScrollingWhileRefreshing;
}
/**
* @deprecated See {@link #setScrollingWhileRefreshingEnabled(boolean)}
*/
public void setDisableScrollingWhileRefreshing(boolean disableScrollingWhileRefreshing) {
setScrollingWhileRefreshingEnabled(!disableScrollingWhileRefreshing);
}
@Override
public final void setFilterTouchEvents(boolean filterEvents) {
mFilterTouchEvents = filterEvents;
}
/**
* @deprecated You should now call this method on the result of
* {@link #getLoadingLayoutProxy()}.
*/
public void setLastUpdatedLabel(CharSequence label) {
getLoadingLayoutProxy().setLastUpdatedLabel(label);
}
/**
* @deprecated You should now call this method on the result of
* {@link #getLoadingLayoutProxy()}.
*/
public void setLoadingDrawable(Drawable drawable) {
getLoadingLayoutProxy().setLoadingDrawable(drawable);
}
/**
* @deprecated You should now call this method on the result of
* {@link #getLoadingLayoutProxy(boolean, boolean)}.
*/
public void setLoadingDrawable(Drawable drawable, Mode mode) {
getLoadingLayoutProxy(mode.showHeaderLoadingLayout(), mode.showFooterLoadingLayout()).setLoadingDrawable(
drawable);
}
@Override
public void setLongClickable(boolean longClickable) {
getRefreshableView().setLongClickable(longClickable);
}
@Override
public final void setMode(Mode mode) {
if (mode != mMode) {
if (DEBUG) {
Log.d(LOG_TAG, "Setting mode to: " + mode);
}
mMode = mode;
updateUIForMode();
}
}
public void setOnPullEventListener(OnPullEventListener<T> listener) {
mOnPullEventListener = listener;
}
@Override
public final void setOnRefreshListener(OnRefreshListener<T> listener) {
mOnRefreshListener = listener;
mOnRefreshListener2 = null;
}
@Override
public final void setOnRefreshListener(OnRefreshListener2<T> listener) {
mOnRefreshListener2 = listener;
mOnRefreshListener = null;
}
/**
* @deprecated You should now call this method on the result of
* {@link #getLoadingLayoutProxy()}.
*/
public void setPullLabel(CharSequence pullLabel) {
getLoadingLayoutProxy().setPullLabel(pullLabel);
}
/**
* @deprecated You should now call this method on the result of
* {@link #getLoadingLayoutProxy(boolean, boolean)}.
*/
public void setPullLabel(CharSequence pullLabel, Mode mode) {
getLoadingLayoutProxy(mode.showHeaderLoadingLayout(), mode.showFooterLoadingLayout()).setPullLabel(pullLabel);
}
/**
* @param enable Whether Pull-To-Refresh should be used
* @deprecated This simple calls setMode with an appropriate mode based on
* the passed value.
*/
public final void setPullToRefreshEnabled(boolean enable) {
setMode(enable ? Mode.getDefault() : Mode.DISABLED);
}
@Override
public final void setPullToRefreshOverScrollEnabled(boolean enabled) {
mOverScrollEnabled = enabled;
}
@Override
public final void setRefreshing() {
setRefreshing(true);
}
@Override
public final void setRefreshing(boolean doScroll) {
if (!isRefreshing()) {
setState(State.MANUAL_REFRESHING, doScroll);
}
}
/**
* @deprecated You should now call this method on the result of
* {@link #getLoadingLayoutProxy()}.
*/
public void setRefreshingLabel(CharSequence refreshingLabel) {
getLoadingLayoutProxy().setRefreshingLabel(refreshingLabel);
}
/**
* @deprecated You should now call this method on the result of
* {@link #getLoadingLayoutProxy(boolean, boolean)}.
*/
public void setRefreshingLabel(CharSequence refreshingLabel, Mode mode) {
getLoadingLayoutProxy(mode.showHeaderLoadingLayout(), mode.showFooterLoadingLayout()).setRefreshingLabel(
refreshingLabel);
}
/**
* @deprecated You should now call this method on the result of
* {@link #getLoadingLayoutProxy()}.
*/
public void setReleaseLabel(CharSequence releaseLabel) {
setReleaseLabel(releaseLabel, Mode.BOTH);
}
/**
* @deprecated You should now call this method on the result of
* {@link #getLoadingLayoutProxy(boolean, boolean)}.
*/
public void setReleaseLabel(CharSequence releaseLabel, Mode mode) {
getLoadingLayoutProxy(mode.showHeaderLoadingLayout(), mode.showFooterLoadingLayout()).setReleaseLabel(
releaseLabel);
}
public void setScrollAnimationInterpolator(Interpolator interpolator) {
mScrollAnimationInterpolator = interpolator;
}
@Override
public final void setShowViewWhileRefreshing(boolean showView) {
mShowViewWhileRefreshing = showView;
}
/**
* @return Either {@link Orientation#VERTICAL} or
* {@link Orientation#HORIZONTAL} depending on the scroll direction.
*/
public abstract Orientation getPullToRefreshScrollDirection();
final void setState(State state, final boolean... params) {
mState = state;
if (DEBUG) {
Log.d(LOG_TAG, "State: " + mState.name());
}
switch (mState) {
case RESET:
onReset();
break;
case PULL_TO_REFRESH:
onPullToRefresh();
break;
case RELEASE_TO_REFRESH:
onReleaseToRefresh();
break;
case REFRESHING:
case MANUAL_REFRESHING:
onRefreshing(params[]);
break;
case OVERSCROLLING:
// NO-OP
break;
}
// Call OnPullEventListener
if (null != mOnPullEventListener) {
mOnPullEventListener.onPullEvent(this, mState, mCurrentMode);
}
}
/**
* Used internally for adding view. Need because we override addView to
* pass-through to the Refreshable View
*/
protected final void addViewInternal(View child, int index, ViewGroup.LayoutParams params) {
super.addView(child, index, params);
}
/**
* Used internally for adding view. Need because we override addView to
* pass-through to the Refreshable View
*/
protected final void addViewInternal(View child, ViewGroup.LayoutParams params) {
super.addView(child, -, params);
}
protected LoadingLayout createLoadingLayout(Context context, Mode mode, TypedArray attrs) {
LoadingLayout layout = mLoadingAnimationStyle.createLoadingLayout(context, mode,
getPullToRefreshScrollDirection(), attrs);
layout.setVisibility(View.INVISIBLE);
return layout;
}
/**
* Used internally for {@link #getLoadingLayoutProxy(boolean, boolean)}.
* Allows derivative classes to include any extra LoadingLayouts.
*/
protected LoadingLayoutProxy createLoadingLayoutProxy(final boolean includeStart, final boolean includeEnd) {
LoadingLayoutProxy proxy = new LoadingLayoutProxy();
if (includeStart && mMode.showHeaderLoadingLayout()) {
proxy.addLayout(mHeaderLayout);
}
if (includeEnd && mMode.showFooterLoadingLayout()) {
proxy.addLayout(mFooterLayout);
}
return proxy;
}
/**
* This is implemented by derived classes to return the created View. If you
* need to use a custom View (such as a custom ListView), override this
* method and return an instance of your custom class.
* <p/>
* Be sure to set the ID of the view in this method, especially if you're
* using a ListActivity or ListFragment.
*
* @param context Context to create view with
* @param attrs AttributeSet from wrapped class. Means that anything you
* include in the XML layout declaration will be routed to the
* created View
* @return New instance of the Refreshable View
*/
protected abstract T createRefreshableView(Context context, AttributeSet attrs);
protected final void disableLoadingLayoutVisibilityChanges() {
mLayoutVisibilityChangesEnabled = false;
}
protected final LoadingLayout getFooterLayout() {
return mFooterLayout;
}
protected final int getFooterSize() {
return mFooterLayout.getContentSize();
}
protected final LoadingLayout getHeaderLayout() {
return mHeaderLayout;
}
protected final int getHeaderSize() {
return mHeaderLayout.getContentSize();
}
protected int getPullToRefreshScrollDuration() {
return SMOOTH_SCROLL_DURATION_MS;
}
protected int getPullToRefreshScrollDurationLonger() {
return SMOOTH_SCROLL_LONG_DURATION_MS;
}
protected FrameLayout getRefreshableViewWrapper() {
return mRefreshableViewWrapper;
}
/**
* Allows Derivative classes to handle the XML Attrs without creating a
* TypedArray themsevles
*
* @param a - TypedArray of PullToRefresh Attributes
*/
protected void handleStyledAttributes(TypedArray a) {
}
/**
* Implemented by derived class to return whether the View is in a state
* where the user can Pull to Refresh by scrolling from the end.
*
* @return true if the View is currently in the correct state (for example,
* bottom of a ListView)
*/
protected abstract boolean isReadyForPullEnd();
/**
* Implemented by derived class to return whether the View is in a state
* where the user can Pull to Refresh by scrolling from the start.
*
* @return true if the View is currently the correct state (for example, top
* of a ListView)
*/
protected abstract boolean isReadyForPullStart();
/**
* Called by {@link #onRestoreInstanceState(Parcelable)} so that derivative
* classes can handle their saved instance state.
*
* @param savedInstanceState - Bundle which contains saved instance state.
*/
protected void onPtrRestoreInstanceState(Bundle savedInstanceState) {
}
/**
* Called by {@link #onSaveInstanceState()} so that derivative classes can
* save their instance state.
*
* @param saveState - Bundle to be updated with saved state.
*/
protected void onPtrSaveInstanceState(Bundle saveState) {
}
/**
* Called when the UI has been to be updated to be in the
* {@link State#PULL_TO_REFRESH} state.
*/
protected void onPullToRefresh() {
switch (mCurrentMode) {
case PULL_FROM_END:
mFooterLayout.pullToRefresh();
break;
case PULL_FROM_START:
mHeaderLayout.pullToRefresh();
break;
default:
// NO-OP
break;
}
}
/**
* Called when the UI has been to be updated to be in the
* {@link State#REFRESHING} or {@link State#MANUAL_REFRESHING} state.
*
* @param doScroll - Whether the UI should scroll for this event.
*/
protected void onRefreshing(final boolean doScroll) {
if (mMode.showHeaderLoadingLayout()) {
mHeaderLayout.refreshing();
}
if (mMode.showFooterLoadingLayout()) {
mFooterLayout.refreshing();
}
if (doScroll) {
if (mShowViewWhileRefreshing) {
// Call Refresh Listener when the Scroll has finished
OnSmoothScrollFinishedListener listener = new OnSmoothScrollFinishedListener() {
@Override
public void onSmoothScrollFinished() {
callRefreshListener();
}
};
switch (mCurrentMode) {
case MANUAL_REFRESH_ONLY:
case PULL_FROM_END:
smoothScrollTo(getFooterSize(), listener);
break;
default:
case PULL_FROM_START:
smoothScrollTo(-getHeaderSize(), listener);
break;
}
} else {
smoothScrollTo();
}
} else {
// We're not scrolling, so just call Refresh Listener now
callRefreshListener();
}
}
/**
* Called when the UI has been to be updated to be in the
* {@link State#RELEASE_TO_REFRESH} state.
*/
protected void onReleaseToRefresh() {
switch (mCurrentMode) {
case PULL_FROM_END:
mFooterLayout.releaseToRefresh();
break;
case PULL_FROM_START:
mHeaderLayout.releaseToRefresh();
break;
default:
// NO-OP
break;
}
}
/**
* Called when the UI has been to be updated to be in the
* {@link State#RESET} state.
*/
protected void onReset() {
mIsBeingDragged = false;
mLayoutVisibilityChangesEnabled = true;
// Always reset both layouts, just in case...
mHeaderLayout.reset();
mFooterLayout.reset();
smoothScrollTo();
}
@Override
protected final void onRestoreInstanceState(Parcelable state) {
if (state instanceof Bundle) {
Bundle bundle = (Bundle) state;
setMode(Mode.mapIntToValue(bundle.getInt(STATE_MODE, )));
mCurrentMode = Mode.mapIntToValue(bundle.getInt(STATE_CURRENT_MODE, ));
mScrollingWhileRefreshingEnabled = bundle.getBoolean(STATE_SCROLLING_REFRESHING_ENABLED, false);
mShowViewWhileRefreshing = bundle.getBoolean(STATE_SHOW_REFRESHING_VIEW, true);
// Let super Restore Itself
super.onRestoreInstanceState(bundle.getParcelable(STATE_SUPER));
State viewState = State.mapIntToValue(bundle.getInt(STATE_STATE, ));
if (viewState == State.REFRESHING || viewState == State.MANUAL_REFRESHING) {
setState(viewState, true);
}
// Now let derivative classes restore their state
onPtrRestoreInstanceState(bundle);
return;
}
super.onRestoreInstanceState(state);
}
@Override
protected final Parcelable onSaveInstanceState() {
Bundle bundle = new Bundle();
// Let derivative classes get a chance to save state first, that way we
// can make sure they don't overrite any of our values
onPtrSaveInstanceState(bundle);
bundle.putInt(STATE_STATE, mState.getIntValue());
bundle.putInt(STATE_MODE, mMode.getIntValue());
bundle.putInt(STATE_CURRENT_MODE, mCurrentMode.getIntValue());
bundle.putBoolean(STATE_SCROLLING_REFRESHING_ENABLED, mScrollingWhileRefreshingEnabled);
bundle.putBoolean(STATE_SHOW_REFRESHING_VIEW, mShowViewWhileRefreshing);
bundle.putParcelable(STATE_SUPER, super.onSaveInstanceState());
return bundle;
}
@Override
protected final void onSizeChanged(int w, int h, int oldw, int oldh) {
if (DEBUG) {
Log.d(LOG_TAG, String.format("onSizeChanged. W: %d, H: %d", w, h));
}
super.onSizeChanged(w, h, oldw, oldh);
// We need to update the header/footer when our size changes
refreshLoadingViewsSize();
// Update the Refreshable View layout
refreshRefreshableViewSize(w, h);
/**
* As we're currently in a Layout Pass, we need to schedule another one
* to layout any changes we've made here
*/
post(new Runnable() {
@Override
public void run() {
requestLayout();
}
});
}
/**
* Re-measure the Loading Views height, and adjust internal padding as
* necessary
*/
protected final void refreshLoadingViewsSize() {
final int maximumPullScroll = (int) (getMaximumPullScroll() * f);
int pLeft = getPaddingLeft();
int pTop = getPaddingTop();
int pRight = getPaddingRight();
int pBottom = getPaddingBottom();
switch (getPullToRefreshScrollDirection()) {
case HORIZONTAL:
if (mMode.showHeaderLoadingLayout()) {
mHeaderLayout.setWidth(maximumPullScroll);
pLeft = -maximumPullScroll;
} else {
pLeft = ;
}
if (mMode.showFooterLoadingLayout()) {
mFooterLayout.setWidth(maximumPullScroll);
pRight = -maximumPullScroll;
} else {
pRight = ;
}
break;
case VERTICAL:
if (mMode.showHeaderLoadingLayout()) {
mHeaderLayout.setHeight(maximumPullScroll);
pTop = -maximumPullScroll;
} else {
pTop = ;
}
if (mMode.showFooterLoadingLayout()) {
mFooterLayout.setHeight(maximumPullScroll);
pBottom = -maximumPullScroll;
} else {
pBottom = ;
}
break;
}
if (DEBUG) {
Log.d(LOG_TAG, String.format("Setting Padding. L: %d, T: %d, R: %d, B: %d", pLeft, pTop, pRight, pBottom));
}
setPadding(pLeft, pTop, pRight, pBottom);
}
protected final void refreshRefreshableViewSize(int width, int height) {
// We need to set the Height of the Refreshable View to the same as
// this layout
LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) mRefreshableViewWrapper.getLayoutParams();
switch (getPullToRefreshScrollDirection()) {
case HORIZONTAL:
if (lp.width != width) {
lp.width = width;
mRefreshableViewWrapper.requestLayout();
}
break;
case VERTICAL:
if (lp.height != height) {
lp.height = height;
mRefreshableViewWrapper.requestLayout();
}
break;
}
}
/**
* Helper method which just calls scrollTo() in the correct scrolling
* direction.
*
* @param value - New Scroll value
*/
protected final void setHeaderScroll(int value) {
if (DEBUG) {
Log.d(LOG_TAG, "setHeaderScroll: " + value);
}
// Clamp value to with pull scroll range
final int maximumPullScroll = getMaximumPullScroll();
value = Math.min(maximumPullScroll, Math.max(-maximumPullScroll, value));
if (mLayoutVisibilityChangesEnabled) {
if (value < ) {
mHeaderLayout.setVisibility(View.VISIBLE);
} else if (value > ) {
mFooterLayout.setVisibility(View.VISIBLE);
} else {
mHeaderLayout.setVisibility(View.INVISIBLE);
mFooterLayout.setVisibility(View.INVISIBLE);
}
}
if (USE_HW_LAYERS) {
/**
* Use a Hardware Layer on the Refreshable View if we've scrolled at
* all. We don't use them on the Header/Footer Views as they change
* often, which would negate any HW layer performance boost.
*/
ViewCompat.setLayerType(mRefreshableViewWrapper, value != ? View.LAYER_TYPE_HARDWARE
: View.LAYER_TYPE_NONE);
}
switch (getPullToRefreshScrollDirection()) {
case VERTICAL:
scrollTo(, value);
break;
case HORIZONTAL:
scrollTo(value, );
break;
}
}
/**
* Smooth Scroll to position using the default duration of
* {@value #SMOOTH_SCROLL_DURATION_MS} ms.
*
* @param scrollValue - Position to scroll to
*/
protected final void smoothScrollTo(int scrollValue) {
smoothScrollTo(scrollValue, getPullToRefreshScrollDuration());
}
/**
* Smooth Scroll to position using the default duration of
* {@value #SMOOTH_SCROLL_DURATION_MS} ms.
*
* @param scrollValue - Position to scroll to
* @param listener - Listener for scroll
*/
protected final void smoothScrollTo(int scrollValue, OnSmoothScrollFinishedListener listener) {
smoothScrollTo(scrollValue, getPullToRefreshScrollDuration(), , listener);
}
/**
* Smooth Scroll to position using the longer default duration of
* {@value #SMOOTH_SCROLL_LONG_DURATION_MS} ms.
*
* @param scrollValue - Position to scroll to
*/
protected final void smoothScrollToLonger(int scrollValue) {
smoothScrollTo(scrollValue, getPullToRefreshScrollDurationLonger());
}
/**
* Updates the View State when the mode has been set. This does not do any
* checking that the mode is different to current state so always updates.
*/
protected void updateUIForMode() {
// We need to use the correct LayoutParam values, based on scroll
// direction
final LinearLayout.LayoutParams lp = getLoadingLayoutLayoutParams();
// Remove Header, and then add Header Loading View again if needed
if (this == mHeaderLayout.getParent()) {
removeView(mHeaderLayout);
}
if (mMode.showHeaderLoadingLayout()) {
addViewInternal(mHeaderLayout, , lp);
}
// Remove Footer, and then add Footer Loading View again if needed
if (this == mFooterLayout.getParent()) {
removeView(mFooterLayout);
}
if (mMode.showFooterLoadingLayout()) {
addViewInternal(mFooterLayout, lp);
}
// Hide Loading Views
refreshLoadingViewsSize();
// If we're not using Mode.BOTH, set mCurrentMode to mMode, otherwise
// set it to pull down
mCurrentMode = (mMode != Mode.BOTH) ? mMode : Mode.PULL_FROM_START;
}
private void addRefreshableView(Context context, T refreshableView) {
mRefreshableViewWrapper = new FrameLayout(context);
mRefreshableViewWrapper.addView(refreshableView, ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT);
addViewInternal(mRefreshableViewWrapper, new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT));
}
private void callRefreshListener() {
if (null != mOnRefreshListener) {
mOnRefreshListener.onRefresh(this);
} else if (null != mOnRefreshListener2) {
if (mCurrentMode == Mode.PULL_FROM_START) {
mOnRefreshListener2.onPullDownToRefresh(this);
} else if (mCurrentMode == Mode.PULL_FROM_END) {
mOnRefreshListener2.onPullUpToRefresh(this);
}
}
}
@SuppressWarnings("deprecation")
private void init(Context context, AttributeSet attrs) {
switch (getPullToRefreshScrollDirection()) {
case HORIZONTAL:
setOrientation(LinearLayout.HORIZONTAL);
break;
case VERTICAL:
default:
setOrientation(LinearLayout.VERTICAL);
break;
}
setGravity(Gravity.CENTER);
ViewConfiguration config = ViewConfiguration.get(context);
mTouchSlop = config.getScaledTouchSlop();
// Styleables from XML
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PullToRefresh);
if (a.hasValue(R.styleable.PullToRefresh_ptrMode)) {
mMode = Mode.mapIntToValue(a.getInteger(R.styleable.PullToRefresh_ptrMode, ));
}
if (a.hasValue(R.styleable.PullToRefresh_ptrAnimationStyle)) {
mLoadingAnimationStyle = AnimationStyle.mapIntToValue(a.getInteger(
R.styleable.PullToRefresh_ptrAnimationStyle, ));
}
// Refreshable View
// By passing the attrs, we can add ListView/GridView params via XML
mRefreshableView = createRefreshableView(context, attrs);
addRefreshableView(context, mRefreshableView);
// We need to create now layouts now
mHeaderLayout = createLoadingLayout(context, Mode.PULL_FROM_START, a);
mFooterLayout = createLoadingLayout(context, Mode.PULL_FROM_END, a);
/**
* Styleables from XML
*/
if (a.hasValue(R.styleable.PullToRefresh_ptrRefreshableViewBackground)) {
Drawable background = a.getDrawable(R.styleable.PullToRefresh_ptrRefreshableViewBackground);
if (null != background) {
mRefreshableView.setBackgroundDrawable(background);
}
} else if (a.hasValue(R.styleable.PullToRefresh_ptrAdapterViewBackground)) {
Utils.warnDeprecation("ptrAdapterViewBackground", "ptrRefreshableViewBackground");
Drawable background = a.getDrawable(R.styleable.PullToRefresh_ptrAdapterViewBackground);
if (null != background) {
mRefreshableView.setBackgroundDrawable(background);
}
}
if (a.hasValue(R.styleable.PullToRefresh_ptrOverScroll)) {
mOverScrollEnabled = a.getBoolean(R.styleable.PullToRefresh_ptrOverScroll, true);
}
if (a.hasValue(R.styleable.PullToRefresh_ptrScrollingWhileRefreshingEnabled)) {
mScrollingWhileRefreshingEnabled = a.getBoolean(
R.styleable.PullToRefresh_ptrScrollingWhileRefreshingEnabled, false);
}
// Let the derivative classes have a go at handling attributes, then
// recycle them...
handleStyledAttributes(a);
a.recycle();
// Finally update the UI for the modes
updateUIForMode();
}
private boolean isReadyForPull() {
switch (mMode) {
case PULL_FROM_START:
return isReadyForPullStart();
case PULL_FROM_END:
return isReadyForPullEnd();
case BOTH:
return isReadyForPullEnd() || isReadyForPullStart();
default:
return false;
}
}
/**
* Actions a Pull Event
*
* @return true if the Event has been handled, false if there has been no
* change
*/
private void pullEvent() {
final int newScrollValue;
final int itemDimension;
final float initialMotionValue, lastMotionValue;
switch (getPullToRefreshScrollDirection()) {
case HORIZONTAL:
initialMotionValue = mInitialMotionX;
lastMotionValue = mLastMotionX;
break;
case VERTICAL:
default:
initialMotionValue = mInitialMotionY;
lastMotionValue = mLastMotionY;
break;
}
switch (mCurrentMode) {
case PULL_FROM_END:
newScrollValue = Math.round(Math.max(initialMotionValue - lastMotionValue, ) / FRICTION);
itemDimension = getFooterSize();
break;
case PULL_FROM_START:
default:
newScrollValue = Math.round(Math.min(initialMotionValue - lastMotionValue, ) / FRICTION);
itemDimension = getHeaderSize();
break;
}
setHeaderScroll(newScrollValue);
if (newScrollValue != && !isRefreshing()) {
float scale = Math.abs(newScrollValue) / (float) itemDimension;
switch (mCurrentMode) {
case PULL_FROM_END:
mFooterLayout.onPull(scale);
break;
case PULL_FROM_START:
default:
mHeaderLayout.onPull(scale);
break;
}
if (mState != State.PULL_TO_REFRESH && itemDimension >= Math.abs(newScrollValue)) {
setState(State.PULL_TO_REFRESH);
} else if (mState == State.PULL_TO_REFRESH && itemDimension < Math.abs(newScrollValue)) {
setState(State.RELEASE_TO_REFRESH);
}
}
}
private LinearLayout.LayoutParams getLoadingLayoutLayoutParams() {
switch (getPullToRefreshScrollDirection()) {
case HORIZONTAL:
return new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.MATCH_PARENT);
case VERTICAL:
default:
return new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
}
}
private int getMaximumPullScroll() {
switch (getPullToRefreshScrollDirection()) {
case HORIZONTAL:
return Math.round(getWidth() / FRICTION);
case VERTICAL:
default:
return Math.round(getHeight() / FRICTION);
}
}
/**
* Smooth Scroll to position using the specific duration
*
* @param scrollValue - Position to scroll to
* @param duration - Duration of animation in milliseconds
*/
private final void smoothScrollTo(int scrollValue, long duration) {
smoothScrollTo(scrollValue, duration, , null);
}
private final void smoothScrollTo(int newScrollValue, long duration, long delayMillis,
OnSmoothScrollFinishedListener listener) {
if (null != mCurrentSmoothScrollRunnable) {
mCurrentSmoothScrollRunnable.stop();
}
final int oldScrollValue;
switch (getPullToRefreshScrollDirection()) {
case HORIZONTAL:
oldScrollValue = getScrollX();
break;
case VERTICAL:
default:
oldScrollValue = getScrollY();
break;
}
if (oldScrollValue != newScrollValue) {
if (null == mScrollAnimationInterpolator) {
// Default interpolator is a Decelerate Interpolator
mScrollAnimationInterpolator = new DecelerateInterpolator();
}
mCurrentSmoothScrollRunnable = new SmoothScrollRunnable(oldScrollValue, newScrollValue, duration, listener);
if (delayMillis > ) {
postDelayed(mCurrentSmoothScrollRunnable, delayMillis);
} else {
post(mCurrentSmoothScrollRunnable);
}
}
}
private final void smoothScrollToAndBack(int y) {
smoothScrollTo(y, SMOOTH_SCROLL_DURATION_MS, , new OnSmoothScrollFinishedListener() {
@Override
public void onSmoothScrollFinished() {
smoothScrollTo(, SMOOTH_SCROLL_DURATION_MS, DEMO_SCROLL_INTERVAL, null);
}
});
}
public static enum AnimationStyle {
/**
* This is the default for Android-PullToRefresh. Allows you to use any
* drawable, which is automatically rotated and used as a Progress Bar.
*/
ROTATE,
/**
* This is the old default, and what is commonly used on iOS. Uses an
* arrow image which flips depending on where the user has scrolled.
*/
FLIP;
static AnimationStyle getDefault() {
return ROTATE;
}
/**
* Maps an int to a specific mode. This is needed when saving state, or
* inflating the view from XML where the mode is given through a attr
* int.
*
* @param modeInt - int to map a Mode to
* @return Mode that modeInt maps to, or ROTATE by default.
*/
static AnimationStyle mapIntToValue(int modeInt) {
switch (modeInt) {
case :
default:
return ROTATE;
case :
return FLIP;
}
}
LoadingLayout createLoadingLayout(Context context, Mode mode, Orientation scrollDirection, TypedArray attrs) {
switch (this) {
case ROTATE:
default:
/**
* 修改 如果動畫類型為旋轉，根據是下拉重新整理還是上拉加載初始化不同布局
*/
if (mode == Mode.PULL_FROM_START)
return new TweenAnimLoadingLayout(context, mode, scrollDirection, attrs);
else
return new RotateLoadingLayout(context, mode, scrollDirection, attrs);
case FLIP:
return new FlipLoadingLayout(context, mode, scrollDirection, attrs);
}
}
}
public static enum Mode {
/**
* Disable all Pull-to-Refresh gesture and Refreshing handling
*/
DISABLED(),
/**
* Only allow the user to Pull from the start of the Refreshable View to
* refresh. The start is either the Top or Left, depending on the
* scrolling direction.
*/
PULL_FROM_START(),
/**
* Only allow the user to Pull from the end of the Refreshable View to
* refresh. The start is either the Bottom or Right, depending on the
* scrolling direction.
*/
PULL_FROM_END(),
/**
* Allow the user to both Pull from the start, from the end to refresh.
*/
BOTH(),
/**
* Disables Pull-to-Refresh gesture handling, but allows manually
* setting the Refresh state via
* {@link PullToRefreshBase#setRefreshing() setRefreshing()}.
*/
MANUAL_REFRESH_ONLY();
/**
* @deprecated Use {@link #PULL_FROM_START} from now on.
*/
public static Mode PULL_DOWN_TO_REFRESH = Mode.PULL_FROM_START;
/**
* @deprecated Use {@link #PULL_FROM_END} from now on.
*/
public static Mode PULL_UP_TO_REFRESH = Mode.PULL_FROM_END;
/**
* Maps an int to a specific mode. This is needed when saving state, or
* inflating the view from XML where the mode is given through a attr
* int.
*
* @param modeInt - int to map a Mode to
* @return Mode that modeInt maps to, or PULL_FROM_START by default.
*/
static Mode mapIntToValue(final int modeInt) {
for (Mode value : Mode.values()) {
if (modeInt == value.getIntValue()) {
return value;
}
}
// If not, return default
return getDefault();
}
static Mode getDefault() {
return PULL_FROM_START;
}
private int mIntValue;
// The modeInt values need to match those from attrs.xml
Mode(int modeInt) {
mIntValue = modeInt;
}
/**
* @return true if the mode permits Pull-to-Refresh
*/
boolean permitsPullToRefresh() {
return !(this == DISABLED || this == MANUAL_REFRESH_ONLY);
}
/**
* @return true if this mode wants the Loading Layout Header to be shown
*/
public boolean showHeaderLoadingLayout() {
return this == PULL_FROM_START || this == BOTH;
}
/**
* @return true if this mode wants the Loading Layout Footer to be shown
*/
public boolean showFooterLoadingLayout() {
return this == PULL_FROM_END || this == BOTH || this == MANUAL_REFRESH_ONLY;
}
int getIntValue() {
return mIntValue;
}
}
// ===========================================================
// Inner, Anonymous Classes, and Enumerations
// ===========================================================
/**
* Simple Listener that allows you to be notified when the user has scrolled
* to the end of the AdapterView. See (
* {@link PullToRefreshAdapterViewBase#setOnLastItemVisibleListener}.
*
* @author Chris Banes
*/
public static interface OnLastItemVisibleListener {
/**
* Called when the user has scrolled to the end of the list
*/
public void onLastItemVisible();
}
/**
* Listener that allows you to be notified when the user has started or
* finished a touch event. Useful when you want to append extra UI events
* (such as sounds). See (
* {@link PullToRefreshAdapterViewBase#setOnPullEventListener}.
*
* @author Chris Banes
*/
public static interface OnPullEventListener<V extends View> {
/**
* Called when the internal state has been changed, usually by the user
* pulling.
*
* @param refreshView - View which has had it's state change.
* @param state - The new state of View.
* @param direction - One of {@link Mode#PULL_FROM_START} or
* {@link Mode#PULL_FROM_END} depending on which direction
* the user is pulling. Only useful when <var>state</var> is
* {@link State#PULL_TO_REFRESH} or
* {@link State#RELEASE_TO_REFRESH}.
*/
public void onPullEvent(final PullToRefreshBase<V> refreshView, State state, Mode direction);
}
/**
* Simple Listener to listen for any callbacks to Refresh.
*
* @author Chris Banes
*/
public static interface OnRefreshListener<V extends View> {
/**
* onRefresh will be called for both a Pull from start, and Pull from
* end
*/
public void onRefresh(final PullToRefreshBase<V> refreshView);
}
/**
* An advanced version of the Listener to listen for callbacks to Refresh.
* This listener is different as it allows you to differentiate between Pull
* Ups, and Pull Downs.
*
* @author Chris Banes
*/
public static interface OnRefreshListener2<V extends View> {
// TODO These methods need renaming to START/END rather than DOWN/UP
/**
* onPullDownToRefresh will be called only when the user has Pulled from
* the start, and released.
*/
public void onPullDownToRefresh(final PullToRefreshBase<V> refreshView);
/**
* onPullUpToRefresh will be called only when the user has Pulled from
* the end, and released.
*/
public void onPullUpToRefresh(final PullToRefreshBase<V> refreshView);
}
public static enum Orientation {
VERTICAL, HORIZONTAL;
}
public static enum State {
/**
* When the UI is in a state which means that user is not interacting
* with the Pull-to-Refresh function.
*/
RESET(),
/**
* When the UI is being pulled by the user, but has not been pulled far
* enough so that it refreshes when released.
*/
PULL_TO_REFRESH(),
/**
* When the UI is being pulled by the user, and <strong>has</strong>
* been pulled far enough so that it will refresh when released.
*/
RELEASE_TO_REFRESH(),
/**
* When the UI is currently refreshing, caused by a pull gesture.
*/
REFRESHING(),
/**
* When the UI is currently refreshing, caused by a call to
* {@link PullToRefreshBase#setRefreshing() setRefreshing()}.
*/
MANUAL_REFRESHING(),
/**
* When the UI is currently overscrolling, caused by a fling on the
* Refreshable View.
*/
OVERSCROLLING();
/**
* Maps an int to a specific state. This is needed when saving state.
*
* @param stateInt - int to map a State to
* @return State that stateInt maps to
*/
static State mapIntToValue(final int stateInt) {
for (State value : State.values()) {
if (stateInt == value.getIntValue()) {
return value;
}
}
// If not, return default
return RESET;
}
private int mIntValue;
State(int intValue) {
mIntValue = intValue;
}
int getIntValue() {
return mIntValue;
}
}
final class SmoothScrollRunnable implements Runnable {
private final Interpolator mInterpolator;
private final int mScrollToY;
private final int mScrollFromY;
private final long mDuration;
private OnSmoothScrollFinishedListener mListener;
private boolean mContinueRunning = true;
private long mStartTime = -;
private int mCurrentY = -;
public SmoothScrollRunnable(int fromY, int toY, long duration, OnSmoothScrollFinishedListener listener) {
mScrollFromY = fromY;
mScrollToY = toY;
mInterpolator = mScrollAnimationInterpolator;
mDuration = duration;
mListener = listener;
}
@Override
public void run() {
/**
* Only set mStartTime if this is the first time we're starting,
* else actually calculate the Y delta
*/
if (mStartTime == -) {
mStartTime = System.currentTimeMillis();
} else {
/**
* We do do all calculations in long to reduce software float
* calculations. We use 1000 as it gives us good accuracy and
* small rounding errors
*/
long normalizedTime = ( * (System.currentTimeMillis() - mStartTime)) / mDuration;
normalizedTime = Math.max(Math.min(normalizedTime, ), );
final int deltaY = Math.round((mScrollFromY - mScrollToY)
* mInterpolator.getInterpolation(normalizedTime / f));
mCurrentY = mScrollFromY - deltaY;
setHeaderScroll(mCurrentY);
}
// If we're not at the target Y, keep going...
if (mContinueRunning && mScrollToY != mCurrentY) {
ViewCompat.postOnAnimation(PullToRefreshBase.this, this);
} else {
if (null != mListener) {
mListener.onSmoothScrollFinished();
}
}
}
public void stop() {
mContinueRunning = false;
removeCallbacks(this);
}
}
static interface OnSmoothScrollFinishedListener {
void onSmoothScrollFinished();
}
}
最後在recyclerview等清單布局的外部嵌套com.handmark.pulltorefresh.library.PullToRefreshScrollView，就大功告成了
![Android 屬性動畫（一）新手入門一、屬性動畫簡介二、屬性動畫的工作原理三、使用入門四、編後語[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)