在Android中，如果想要實作3D動畫效果一般有兩種選擇：一是使用Open GL ES，二是使用Camera。Open GL ES使用起來太過複雜，一般是用于比較進階的3D特效或遊戲，并且這個也不是開源的，像比較簡單的一些3D效果，使用Camera就足夠了。
一些熟知的Android 3D動畫如對某個View進行旋轉或翻轉的 Rotate3dAnimation類，還有使用Gallery( Gallery目前已過時，現在都推薦使用 HorizontalScrollView或 RecyclerView替代其實作相應功能) 實作的3D畫廊效果等，當然有一些特效要通過僞3D變換來實作，比如CoverFlow效果，它使用标準Android 2D庫，還是繼承的Gallery類并自定義一些方法，具體實作和使用請參照Android實作CoverFlow效果控件的執行個體代碼。
本文要實作的3D星體旋轉效果也是從這個CoverFlow演繹而來，不過CoverFlow隻是對圖像進行轉動，我這裡要實作的效果是要對所有的View進行類似旋轉木馬的轉動，并且CoverFlow還存在很多已知bug,是以我這裡需要重寫一些類，并且将Scroller類用Rotator類替代，使界面看起來具有滾動效果，實際上是在轉動一組圖像。
首先我們需要自定義控件的一些屬性，我們将控件取名Carousel，需要設定子項的最小個數和最大個數、目前選中項以及定義旋轉角度等，attrs.xml
The CarouselImageView Class
這個類裝載控件子項在3D空間的位置、子項的索引和目前子項的角度，通過實作Comparable接口，幫助我們确定子項繪制的順序
package com.john.carousel.lib;
import android.content.Context;
import android.util.AttributeSet;
import android.widget.ImageView;
public class CarouselImageView extends ImageView implements Comparable
{
private int index;
private float currentAngle;
private float x;
private float y;
private float z;
private boolean drawn;
public CarouselImageView(Context context)
{
this(context, null, 0);
}
public CarouselImageView(Context context, AttributeSet attrs)
{
this(context, attrs, 0);
}
public CarouselImageView(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
}
public void setIndex(int index)
{
this.index = index;
}
public int getIndex()
{
return index;
}
public void setCurrentAngle(float currentAngle)
{
this.currentAngle = currentAngle;
}
public float getCurrentAngle()
{
return currentAngle;
}
public int compareTo(CarouselImageView another)
{
return (int) (another.z - this.z);
}
public void setX(float x)
{
this.x = x;
}
public float getX()
{
return x;
}
public void setY(float y)
{
this.y = y;
}
public float getY()
{
return y;
}
public void setZ(float z)
{
this.z = z;
}
public float getZ()
{
return z;
}
public void setDrawn(boolean drawn)
{
this.drawn = drawn;
}
public boolean isDrawn()
{
return drawn;
}
}
The Carousel Item Class
這個類簡化我上面定義的 CarouselImageView一些控件屬性
package com.john.carousel.lib;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.TextView;
public class CarouselItem extends FrameLayout implements Comparable
{
public ImageView mImage;
public TextView mText, mTextUp;
public Context context;
public int index;
public float currentAngle;
public float itemX;
public float itemY;
public float itemZ;
public float degX;
public float degY;
public float degZ;
public boolean drawn;
// It's needed to find screen coordinates
private Matrix mCIMatrix;
public CarouselItem(Context context)
{
super(context);
this.context = context;
FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
this.setLayoutParams(params);
LayoutInflater inflater = LayoutInflater.from(context);
View itemTemplate = inflater.inflate(R.layout.carousel_item, this, true);
mImage = (ImageView) itemTemplate.findViewById(R.id.item_image);
mText = (TextView) itemTemplate.findViewById(R.id.item_text);
mTextUp = (TextView) itemTemplate.findViewById(R.id.item_text_up);
}
public void setTextColor(int i)
{
this.mText.setTextColor(context.getResources().getColorStateList(i));
this.mTextUp.setTextColor(context.getResources().getColorStateList(i));
}
public String getName()
{
return mText.getText().toString();
}
public void setIndex(int index)
{
this.index = index;
}
public int getIndex()
{
return index;
}
public void setCurrentAngle(float currentAngle)
{
if (index == 0 && currentAngle > 5)
{
Log.d("", "");
}
this.currentAngle = currentAngle;
}
public float getCurrentAngle()
{
return currentAngle;
}
public int compareTo(CarouselItem another)
{
return (int) (another.itemZ - this.itemZ);
}
public void setItemX(float x)
{
this.itemX = x;
}
public float getItemX()
{
return itemX;
}
public void setItemY(float y)
{
this.itemY = y;
}
public float getItemY()
{
return itemY;
}
public void setItemZ(float z)
{
this.itemZ = z;
}
public float getItemZ()
{
return itemZ;
}
public float getDegX()
{
return degX;
}
public void setDegX(float degX)
{
this.degX = degX;
}
public float getDegY()
{
return degY;
}
public void setDegY(float degY)
{
this.degY = degY;
}
public float getDegZ()
{
return degZ;
}
public void setDegZ(float degZ)
{
this.degZ = degZ;
}
public void setDrawn(boolean drawn)
{
this.drawn = drawn;
}
public boolean isDrawn()
{
return drawn;
}
public void setImageBitmap(Bitmap bitmap)
{
mImage.setImageBitmap(bitmap);
}
public void setText(int i)
{
String s = context.getResources().getString(i);
mText.setText(s);
mTextUp.setText(s);
}
public void setText(String txt)
{
mText.setText(txt);
mTextUp.setText(txt);
}
Matrix getCIMatrix()
{
return mCIMatrix;
}
void setCIMatrix(Matrix mMatrix)
{
this.mCIMatrix = mMatrix;
}
public void setImage(int i)
{
mImage.setImageDrawable(context.getResources().getDrawable(i));
}
public void setVisiblity(int id)
{
if (id == 0)
{
mText.setVisibility(View.INVISIBLE);
mTextUp.setVisibility(View.VISIBLE);
}
else
{
mTextUp.setVisibility(View.INVISIBLE);
mText.setVisibility(View.VISIBLE);
}
}
}
The Rotator Class
如果你去檢視Scroller類方法，你會發現它定義了兩種操作模式：滑動模式和抛動作，用來計算目前相對于給出的起始位置的偏移量，我們需要移除一些不需要的成員變量，添加我們自己的成員，并且修改相應的計算方法
package com.john.carousel.lib;
import android.content.Context;
import android.view.animation.AnimationUtils;
public class Rotator
{
private float mStartAngle;
private float mCurrAngle;
private long mStartTime;
private long mDuration;
private float mDeltaAngle;
private boolean mFinished;
private int direction;
private float mCurrDeg;
public Rotator(Context context)
{
mFinished = true;
}
public final boolean isFinished()
{
return mFinished;
}
public final void forceFinished(boolean finished)
{
mFinished = finished;
}
public final long getDuration()
{
return mDuration;
}
public final float getCurrAngle()
{
return mCurrAngle;
}
public final float getStartAngle()
{
return mStartAngle;
}
public int timePassed()
{
return (int) (AnimationUtils.currentAnimationTimeMillis() - mStartTime);
}
public int getdirection()
{
return this.direction;
}
public float getCurrDeg()
{
return this.mCurrDeg;
}
public void extendDuration(int extend)
{
int passed = timePassed();
mDuration = passed + extend;
mFinished = false;
}
public void abortAnimation()
{
mFinished = true;
}
public boolean computeAngleOffset()
{
if (mFinished)
{
return false;
}
long systemClock = AnimationUtils.currentAnimationTimeMillis();
long timePassed = systemClock - mStartTime;
if (timePassed < mDuration)
{
float sc = (float) timePassed / mDuration;
mCurrAngle = mStartAngle + Math.round(mDeltaAngle * sc);
mCurrDeg = direction == 0 ? (Math.round(360 * sc)) : (Math.round(-360 * sc));
return true;
}
else
{
mCurrAngle = mStartAngle + mDeltaAngle;
mCurrDeg = direction == 0 ? 360 : -360;
mFinished = true;
return false;
}
}
public void startRotate(float startAngle, float dAngle, int duration, int direction)
{
mFinished = false;
mDuration = duration;
mStartTime = AnimationUtils.currentAnimationTimeMillis();
mStartAngle = startAngle;
mDeltaAngle = dAngle;
this.direction = direction;
}
}
The CarouselSpinner Class
package com.john.carousel.lib;
import android.content.Context;
import android.database.DataSetObserver;
import android.graphics.Rect;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.util.SparseArray;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsSpinner;
import android.widget.SpinnerAdapter;
public abstract class CarouselSpinner extends CarouselAdapter
{
SpinnerAdapter mAdapter;
int mHeightMeasureSpec;
int mWidthMeasureSpec;
boolean mBlockLayoutRequests;
int mSelectionLeftPadding = 0;
int mSelectionTopPadding = 0;
int mSelectionRightPadding = 0;
int mSelectionBottomPadding = 0;
final Rect mSpinnerPadding = new Rect();
final RecycleBin mRecycler = new RecycleBin();
private DataSetObserver mDataSetObserver;
public CarouselSpinner(Context context)
{
super(context);
initCarouselSpinner();
}
public CarouselSpinner(Context context, AttributeSet attrs)
{
this(context, attrs, 0);
}
public CarouselSpinner(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
initCarouselSpinner();
}
private void initCarouselSpinner()
{
setFocusable(true);
setWillNotDraw(false);
}
@Override
public SpinnerAdapter getAdapter()
{
return mAdapter;
}
@Override
public void setAdapter(SpinnerAdapter adapter)
{
if (null != mAdapter)
{
mAdapter.unregisterDataSetObserver(mDataSetObserver);
resetList();
}
mAdapter = adapter;
mOldSelectedPosition = INVALID_POSITION;
mOldSelectedRowId = INVALID_ROW_ID;
if (mAdapter != null)
{
mOldItemCount = mItemCount;
mItemCount = mAdapter.getCount();
checkFocus();
mDataSetObserver = new AdapterDataSetObserver();
mAdapter.registerDataSetObserver(mDataSetObserver);
int position = mItemCount > 0 ? 0 : INVALID_POSITION;
setSelectedPositionInt(position);
setNextSelectedPositionInt(position);
if (mItemCount == 0)
{
// Nothing selected
checkSelectionChanged();
}
}
else
{
checkFocus();
resetList();
// Nothing selected
checkSelectionChanged();
}
requestLayout();
}
@Override
public View getSelectedView()
{
if (mItemCount > 0 && mSelectedPosition >= 0)
{
return getChildAt(mSelectedPosition - mFirstPosition);
}
else
{
return null;
}
}
public void setSelection(int position, boolean animate)
{
// Animate only if requested position is already on screen somewhere
boolean shouldAnimate = animate && mFirstPosition <= position && position <= mFirstPosition + getChildCount() - 1;
setSelectionInt(position, shouldAnimate);
}
void setSelectionInt(int position, boolean animate)
{
if (position != mOldSelectedPosition)
{
mBlockLayoutRequests = true;
int delta = position - mSelectedPosition;
setNextSelectedPositionInt(position);
layout(delta, animate);
mBlockLayoutRequests = false;
}
}
abstract void layout(int delta, boolean animate);
@Override
public void setSelection(int position)
{
setSelectionInt(position, false);
}
void resetList()
{
mDataChanged = false;
mNeedSync = false;
removeAllViewsInLayout();
mOldSelectedPosition = INVALID_POSITION;
mOldSelectedRowId = INVALID_ROW_ID;
setSelectedPositionInt(INVALID_POSITION);
setNextSelectedPositionInt(INVALID_POSITION);
invalidate();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int widthSize;
int heightSize;
mSpinnerPadding.left = getPaddingLeft() > mSelectionLeftPadding ? getPaddingLeft() : mSelectionLeftPadding;
mSpinnerPadding.top = getPaddingTop() > mSelectionTopPadding ? getPaddingTop() : mSelectionTopPadding;
mSpinnerPadding.right = getPaddingRight() > mSelectionRightPadding ? getPaddingRight() : mSelectionRightPadding;
mSpinnerPadding.bottom = getPaddingBottom() > mSelectionBottomPadding ? getPaddingBottom() : mSelectionBottomPadding;
if (mDataChanged)
{
handleDataChanged();
}
int preferredHeight = 0;
int preferredWidth = 0;
boolean needsMeasuring = true;
int selectedPosition = getSelectedItemPosition();
if (selectedPosition >= 0 && mAdapter != null && selectedPosition < mAdapter.getCount())
{
// Try looking in the recycler. (Maybe we were measured once
// already)
View view = mRecycler.get(selectedPosition);
if (view == null)
{
// Make a new one
view = mAdapter.getView(selectedPosition, null, this);
}
if (view != null)
{
// Put in recycler for re-measuring and/or layout
mRecycler.put(selectedPosition, view);
}
if (view != null)
{
if (view.getLayoutParams() == null)
{
mBlockLayoutRequests = true;
view.setLayoutParams(generateDefaultLayoutParams());
mBlockLayoutRequests = false;
}
measureChild(view, widthMeasureSpec, heightMeasureSpec);
preferredHeight = getChildHeight(view) + mSpinnerPadding.top + mSpinnerPadding.bottom;
preferredWidth = getChildWidth(view) + mSpinnerPadding.left + mSpinnerPadding.right;
needsMeasuring = false;
}
}
if (needsMeasuring)
{
// No views -- just use padding
preferredHeight = mSpinnerPadding.top + mSpinnerPadding.bottom;
if (widthMode == MeasureSpec.UNSPECIFIED)
{
preferredWidth = mSpinnerPadding.left + mSpinnerPadding.right;
}
}
preferredHeight = Math.max(preferredHeight, getSuggestedMinimumHeight());
preferredWidth = Math.max(preferredWidth, getSuggestedMinimumWidth());
heightSize = resolveSize(preferredHeight, heightMeasureSpec);
widthSize = resolveSize(preferredWidth, widthMeasureSpec);
setMeasuredDimension(widthSize, heightSize);
mHeightMeasureSpec = heightMeasureSpec;
mWidthMeasureSpec = widthMeasureSpec;
}
int getChildHeight(View child)
{
return child.getMeasuredHeight();
}
int getChildWidth(View child)
{
return child.getMeasuredWidth();
}
@Override
protected ViewGroup.LayoutParams generateDefaultLayoutParams()
{
return new Carousel.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
}
void recycleAllViews()
{
final int childCount = getChildCount();
final CarouselSpinner.RecycleBin recycleBin = mRecycler;
final int position = mFirstPosition;
// All views go in recycler
for (int i = 0; i < childCount; i++)
{
View v = getChildAt(i);
int index = position + i;
recycleBin.put(index, v);
}
}
@Override
public void requestLayout()
{
if (!mBlockLayoutRequests)
{
super.requestLayout();
}
}
@Override
public int getCount()
{
return mItemCount;
}
public int pointToPosition(int x, int y)
{
// All touch events are applied to selected item
return mSelectedPosition;
}
static class SavedState extends BaseSavedState
{
long selectedId;
int position;
SavedState(Parcelable superState)
{
super(superState);
}
private SavedState(Parcel in)
{
super(in);
selectedId = in.readLong();
position = in.readInt();
}
@Override
public void writeToParcel(Parcel out, int flags)
{
super.writeToParcel(out, flags);
out.writeLong(selectedId);
out.writeInt(position);
}
@Override
public String toString()
{
return "AbsSpinner.SavedState{" + Integer.toHexString(System.identityHashCode(this)) + " selectedId=" + selectedId + " position=" + position + "}";
}
public static final Parcelable.Creator CREATOR = new Parcelable.Creator()
{
public SavedState createFromParcel(Parcel in)
{
return new SavedState(in);
}
public SavedState[] newArray(int size)
{
return new SavedState[size];
}
};
}
@Override
public Parcelable onSaveInstanceState()
{
Parcelable superState = super.onSaveInstanceState();
SavedState ss = new SavedState(superState);
ss.selectedId = getSelectedItemId();
if (ss.selectedId >= 0)
{
ss.position = getSelectedItemPosition();
}
else
{
ss.position = INVALID_POSITION;
}
return ss;
}
@Override
public void onRestoreInstanceState(Parcelable state)
{
SavedState ss = (SavedState) state;
super.onRestoreInstanceState(ss.getSuperState());
if (ss.selectedId >= 0)
{
mDataChanged = true;
mNeedSync = true;
mSyncRowId = ss.selectedId;
mSyncPosition = ss.position;
mSyncMode = SYNC_SELECTED_POSITION;
requestLayout();
}
}
class RecycleBin
{
private final SparseArray mScrapHeap = new SparseArray();
public void put(int position, View v)
{
mScrapHeap.put(position, v);
}
View get(int position)
{
// System.out.print("Looking for " + position);
View result = mScrapHeap.get(position);
if (result != null)
{
// System.out.println(" HIT");
mScrapHeap.delete(position);
}
else
{
// System.out.println(" MISS");
}
return result;
}
void clear()
{
final SparseArray scrapHeap = mScrapHeap;
final int count = scrapHeap.size();
for (int i = 0; i < count; i++)
{
final View view = scrapHeap.valueAt(i);
if (view != null)
{
removeDetachedView(view, true);
}
}
scrapHeap.clear();
}
}
}
The CarouselAdapter Class
[The CarouselAdapter vs. AdapterView]
The only changes are in updateEmptyStatus method where unavailable variables were replaced with their getters.
The Carousel Class
package com.john.carousel.lib;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Camera;
import android.graphics.Matrix;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Transformation;
import android.widget.BaseAdapter;
public class Carousel extends CarouselSpinner implements Constants
{
private int mAnimationDuration = 100;
private int mAnimationDurationMin = 50;
private Camera mCamera = null;
private FlingRotateRunnable mFlingRunnable = null;
private int mGravity = 0;
private View mSelectedChild = null;
private static int mSelectedItemIndex = 2;
private boolean mShouldStopFling = false;
private static final int LEFT = 0;
private static final int RIGHT = 1;
private boolean mSuppressSelectionChanged = false;
private float mTheta = 0.0f;
private boolean isFocus = true;
private ImageAdapter adapter = null;
private static final int ONE_ITEM = 1;
private CarouselItemClickListener callback = null;
public Carousel(Context context)
{
this(context, null);
}
public Carousel(Context context, AttributeSet attrs)
{
this(context, attrs, 0);
}
public Carousel(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
setChildrenDrawingOrderEnabled(false);
setStaticTransformationsEnabled(true);
TypedArray arr = getContext().obtainStyledAttributes(attrs, R.styleable.Carousel);
int imageArrayID = arr.getResourceId(R.styleable.Carousel_Items, -1);
TypedArray images = getResources().obtainTypedArray(imageArrayID);
int namesForItems = arr.getResourceId(R.styleable.Carousel_Names, -1);
TypedArray names = null;
if (namesForItems != -1)
{
names = getResources().obtainTypedArray(namesForItems);
}
initView(images, names);
arr.recycle();
images.recycle();
if (names != null)
{
names.recycle();
}
}
private void initView(TypedArray images, TypedArray names)
{
mCamera = new Camera();
mFlingRunnable = new FlingRotateRunnable();
mTheta = (float) (15.0f * (Math.PI / 180.0));
adapter = new ImageAdapter(getContext());
adapter.setImages(images, names);
setAdapter(adapter);
setSelectedPositionInt(mSelectedItemIndex);
}
@Override
protected int computeHorizontalScrollExtent()
{
// Only 1 item is considered to be selected
return ONE_ITEM;
}
@Override
protected int computeHorizontalScrollOffset()
{
// Current scroll position is the same as the selected position
return mSelectedPosition;
}
@Override
protected int computeHorizontalScrollRange()
{
// Scroll range is the same as the item count
return mItemCount;
}
public void setFocusFlag(boolean flag)
{
this.isFocus = flag;
adapter.notifyDataSetChanged();
}
public boolean getFocusFlag()
{
return this.isFocus;
}
public void setSelected(int index)
{
setNextSelectedPositionInt(index);
mSelectedItemIndex = index;
}
public void setCarouselItemClickCallBack(CarouselItemClickListener listener)
{
callback = listener;
}
public interface CarouselItemClickListener
{
public void CarouselClickCallBack(int itemPosition);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
switch (keyCode)
{
case KEY_OK:
case KEY_CENTER:
callback.CarouselClickCallBack(mSelectedItemIndex);
return true;
case KEY_LEFT:
toNextLeftItem();
return true;
case KEY_RIGHT:
toNextRightItem();
return true;
}
return super.onKeyDown(keyCode, event);
}
@Override
protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect)
{
super.onFocusChanged(gainFocus, direction, previouslyFocusedRect);
if (gainFocus && mSelectedChild != null)
{
mSelectedChild.requestFocus(direction);
}
}
@Override
protected boolean checkLayoutParams(ViewGroup.LayoutParams p)
{
return p instanceof LayoutParams;
}
@Override
protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p)
{
return new LayoutParams(p);
}
@Override
public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs)
{
return new LayoutParams(getContext(), attrs);
}
@Override
protected void dispatchSetPressed(boolean pressed)
{
if (mSelectedChild != null)
{
mSelectedChild.setPressed(pressed);
}
}
@Override
public boolean dispatchKeyEvent(KeyEvent event)
{
return false;
}
@Override
protected boolean getChildStaticTransformation(View child, Transformation transformation)
{
transformation.clear();
transformation.setTransformationType(Transformation.TYPE_MATRIX);
// Center of the view
float centerX = (float) getWidth() / 2, centerY = (float) getHeight() / 2;
mCamera.save();
final Matrix matrix = transformation.getMatrix();
mCamera.translate(((CarouselItem) child).getItemX(), ((CarouselItem) child).getItemY(), ((CarouselItem) child).getItemZ());
mCamera.getMatrix(matrix);
matrix.preTranslate(-centerX, -centerY);
matrix.postTranslate(centerX, centerY);
float[] values = new float[9];
matrix.getValues(values);
mCamera.restore();
Matrix mm = new Matrix();
mm.setValues(values);
((CarouselItem) child).setCIMatrix(mm);
child.invalidate();
return true;
}
// CarouselAdapter overrides
void layout(int delta, boolean animate)
{
Log.d("ORDER", "layout");
if (mDataChanged)
{
handleDataChanged();
}
if (mNextSelectedPosition >= 0)
{
setSelectedPositionInt(mNextSelectedPosition);
}
recycleAllViews();
detachAllViewsFromParent();
int count = getAdapter().getCount();
float angleUnit = 360.0f / count;
float angleOffset = mSelectedPosition * angleUnit;
for (int i = 0; i < getAdapter().getCount(); i++)
{
float angle = angleUnit * i - angleOffset;
if (angle < 0.0f)
{
angle = 360.0f + angle;
}
makeAndAddView(i, angle);
}
mRecycler.clear();
invalidate();
setNextSelectedPositionInt(mSelectedPosition);
checkSelectionChanged();
mNeedSync = false;
updateSelectedItemMetadata();
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b)
{
super.onLayout(changed, l, t, r, b);
Log.d("ORDER", "onLayout");
mInLayout = true;
layout(0, false);
mInLayout = false;
}
@Override
void selectionChanged()
{
if (!mSuppressSelectionChanged)
{
super.selectionChanged();
}
}
@Override
void setSelectedPositionInt(int position)
{
super.setSelectedPositionInt(position);
super.setNextSelectedPositionInt(position);
updateSelectedItemMetadata();
}
private class FlingRotateRunnable implements Runnable
{
private Rotator mRotator;
private float mLastFlingAngle;
public FlingRotateRunnable()
{
mRotator = new Rotator(getContext());
}
private void startCommon()
{
removeCallbacks(this);
}
public void startUsingDistance(float deltaAngle, int flag, int direction)
{
if (deltaAngle == 0)
return;
startCommon();
mLastFlingAngle = 0;
synchronized (this)
{
mRotator.startRotate(0.0f, -deltaAngle, flag == 0 ? mAnimationDuration : mAnimationDurationMin, direction);
}
post(this);
}
private void endFling(boolean scrollIntoSlots, int direction)
{
synchronized (this)
{
mRotator.forceFinished(true);
}
if (scrollIntoSlots)
{
scrollIntoSlots(direction);
}
}
public void run()
{
Log.d("ORDER", "run");
mShouldStopFling = false;
final Rotator rotator;
final float angle;
final float deg;
boolean more;
int direction;
synchronized (this)
{
rotator = mRotator;
more = rotator.computeAngleOffset();
angle = rotator.getCurrAngle();
deg = rotator.getCurrDeg();
direction = rotator.getdirection();
}
if (more && !mShouldStopFling)
{
Log.d("GETVIEW", "========go");
float delta = mLastFlingAngle - angle;
trackMotionScroll(delta, deg);
mLastFlingAngle = angle;
post(this);
}
else
{
Log.d("GETVIEW", "========end");
float delta = mLastFlingAngle - angle;
trackMotionScroll(delta, deg);
mLastFlingAngle = 0.0f;
endFling(false, direction);
}
}
}
private class ImageAdapter extends BaseAdapter
{
private Context mContext;
private CarouselItem[] mImages;
private int[] lightImages = { R.drawable.icons_light_network, R.drawable.icons_light_update, R.drawable.icons_light_app, R.drawable.icons_light_stb, R.drawable.icons_light_other,
R.drawable.icons_light_wallpaper, R.drawable.icons_light_media };
private final int[] normalImages = { R.drawable.icons_normal_network0, R.drawable.icons_normal_update0, R.drawable.icons_normal_app0, R.drawable.icons_normal_stb0,
R.drawable.icons_normal_other0, R.drawable.icons_normal_wallpaper0, R.drawable.icons_normal_meida0 };
private final int[] colors = { R.color.network_text_color, R.color.update_text_color, R.color.app_text_color, R.color.stb_text_color, R.color.other_text_color, R.color.wallpaper_text_color,
R.color.media_text_color, R.color.text_color_white };
// private final int[] names = { R.string.STR_NETWORK,
// R.string.STR_UPDATE, R.string.STR_APP, R.string.STR_STB,
// R.string.STR_OTHER, R.string.STR_WALLPAPER, R.string.STR_MEDIA };
public ImageAdapter(Context c)
{
mContext = c;
}
public void setImages(TypedArray array, TypedArray names)
{
Drawable[] drawables = new Drawable[array.length()];
mImages = new CarouselItem[array.length()];
for (int i = 0; i < array.length(); i++)
{
drawables[i] = array.getDrawable(i);
Bitmap originalImage = ((BitmapDrawable) drawables[i]).getBitmap();
CarouselItem item = new CarouselItem(mContext);
item.setIndex(i);
item.setImageBitmap(originalImage);
if (names != null)
{
item.setText(names.getString(i));
}
if (i == mSelectedItemIndex || (i + 6) % 7 == mSelectedItemIndex || (i + 1) % 7 == mSelectedItemIndex)
{
item.setVisiblity(1);
}
else
{
item.setVisiblity(0);
}
mImages[i] = item;
}
}
public int getCount()
{
if (mImages == null)
{
return 0;
}
else
{
return mImages.length;
}
}
public Object getItem(int position)
{
return position;
}
public long getItemId(int position)
{
return position;
}
public View getView(int position, View convertView, ViewGroup parent)
{
if (position == mSelectedItemIndex || (position + 6) % 7 == mSelectedItemIndex || (position + 1) % 7 == mSelectedItemIndex)
{
mImages[position].setVisiblity(1);
}
else
{
mImages[position].setVisiblity(0);
}
if (position == mSelectedItemIndex && isFocus)
{
mImages[position].setImage(lightImages[position]);
mImages[position].setTextColor(colors[position]);
}
else
{
mImages[position].setImage(normalImages[position]);
mImages[position].setTextColor(colors[7]);
}
Log.d("GETVIEW", position + ":getView");
return mImages[position];
}
}
@SuppressLint("FloatMath")
private void Calculate3DPosition(CarouselItem child, int diameter, float angleOffset)
{
angleOffset = angleOffset * (float) (Math.PI / 180.0f);
float x = -(float) (diameter / 2 * android.util.FloatMath.sin(angleOffset) * 1.05) + diameter / 2 - child.getWidth() / 2;
float z = diameter / 2 * (1.0f - (float) android.util.FloatMath.cos(angleOffset));
float y = -getHeight() / 2 + (float) (z * android.util.FloatMath.sin(mTheta)) + 120;
child.setItemX(x);
child.setItemZ(z);
child.setItemY(y);
}
private int calculateTop(View child, boolean duringLayout)
{
int myHeight = duringLayout ? getMeasuredHeight() : getHeight();
int childHeight = duringLayout ? child.getMeasuredHeight() : child.getHeight();
int childTop = 0;
switch (mGravity)
{
case Gravity.TOP:
childTop = mSpinnerPadding.top;
break;
case Gravity.CENTER_VERTICAL:
int availableSpace = myHeight - mSpinnerPadding.bottom - mSpinnerPadding.top - childHeight;
childTop = mSpinnerPadding.top + (availableSpace / 2);
break;
case Gravity.BOTTOM:
childTop = myHeight - mSpinnerPadding.bottom - childHeight;
break;
}
return childTop;
}
private void makeAndAddView(int position, float angleOffset)
{
Log.d("ORDER", "makeAndAddView");
CarouselItem child;
if (!mDataChanged)
{
child = (CarouselItem) mRecycler.get(position);
if (child != null)
{
// Position the view
setUpChild(child, child.getIndex(), angleOffset);
}
else
{
// Nothing found in the recycler -- ask the adapter for a view
child = (CarouselItem) mAdapter.getView(position, null, this);
Log.d("GETVIEW", "makeAndAddView1");
// Position the view
setUpChild(child, child.getIndex(), angleOffset);
}
return;
}
// Nothing found in the recycler -- ask the adapter for a view
child = (CarouselItem) mAdapter.getView(position, null, this);
Log.d("GETVIEW", "makeAndAddView2");
// Position the view
setUpChild(child, child.getIndex(), angleOffset);
}
private void onFinishedMovement()
{
if (mSuppressSelectionChanged)
{
mSuppressSelectionChanged = false;
super.selectionChanged();
}
checkSelectionChanged();
invalidate();
}
private void scrollIntoSlots(int direction)
{
Log.d("ORDER", "scrollIntoSlots");
float angle;
int position;
ArrayList arr = new ArrayList();
for (int i = 0; i < getAdapter().getCount(); i++)
{
arr.add(((CarouselItem) getAdapter().getView(i, null, null)));
Log.d("GETVIEW", "scrollIntoSlots");
}
Collections.sort(arr, new Comparator()
{
public int compare(CarouselItem c1, CarouselItem c2)
{
int a1 = (int) c1.getCurrentAngle();
if (a1 > 180)
{
a1 = 360 - a1;
}
int a2 = (int) c2.getCurrentAngle();
if (a2 > 180)
{
a2 = 360 - a2;
}
return (a1 - a2);
}
});
angle = arr.get(0).getCurrentAngle();
if (angle > 180.0f)
{
angle = -(360.0f - angle);
}
if (Math.abs(angle) > 0.5f)
{
mFlingRunnable.startUsingDistance(-angle, 1, direction);
}
else
{
position = arr.get(0).getIndex();
setSelectedPositionInt(position);
onFinishedMovement();
}
}
public int getIndex()
{
return mSelectedItemIndex;
}
private void resetIndex()
{
if (mSelectedItemIndex == 7)
{
mSelectedItemIndex = 0;
}
if (mSelectedItemIndex == -1)
{
mSelectedItemIndex = 6;
}
}
public void toNextRightItem()
{
mSelectedItemIndex = mSelectedItemIndex - 1;
resetIndex();
scrollToChild(mSelectedItemIndex, RIGHT);
setSelectedPositionInt(mSelectedItemIndex);
}
public void toNextLeftItem()
{
mSelectedItemIndex = mSelectedItemIndex + 1;
resetIndex();
scrollToChild(mSelectedItemIndex, LEFT);
setSelectedPositionInt(mSelectedItemIndex);
}
void scrollToChild(int i, int v)
{
Log.d("ORDER", "scrollToChild");
CarouselItem view = (CarouselItem) getAdapter().getView(i, null, null);
Log.d("GETVIEW", "scrollToChild");
float angle = view.getCurrentAngle();
Log.d("selectCurrentAngle", "Angle:" + angle);
if (angle == 0)
{
return;
}
if (angle > 180.0f)
{
angle = 360.0f - angle;
}
else
{
angle = -angle;
}
mFlingRunnable.startUsingDistance(angle, 0, v);
}
public void setGravity(int gravity)
{
if (mGravity != gravity)
{
mGravity = gravity;
requestLayout();
}
}
private void setUpChild(CarouselItem child, int index, float angleOffset)
{
Log.d("ORDER", "setUpChild");
// Ignore any layout parameters for child, use wrap content
addViewInLayout(child, -1 , generateDefaultLayoutParams());
child.setSelected(index == mSelectedPosition);
int h;
int w;
int d;
if (mInLayout)
{
w = child.getMeasuredWidth();
h = child.getMeasuredHeight();
d = getMeasuredWidth();
}
else
{
w = child.getMeasuredWidth();
h = child.getMeasuredHeight();
d = getWidth();
}
child.setCurrentAngle(angleOffset);
child.measure(w, h);
int childLeft;
int childTop = calculateTop(child, true);
childLeft = 0;
child.layout(childLeft, childTop - 45, w, h);
Calculate3DPosition(child, d, angleOffset);
}
void trackMotionScroll(float deltaAngle, float deg)
{
Log.d("ORDER", "trackMotionScroll");
for (int i = 0; i < getAdapter().getCount(); i++)
{
CarouselItem child = (CarouselItem) getAdapter().getView(i, null, null);
Log.d("GETVIEW", "trackMotionScroll");
float angle = child.getCurrentAngle();
angle += deltaAngle;
while (angle > 360.0f)
{
angle -= 360.0f;
}
while (angle < 0.0f)
{
angle += 360.0f;
}
child.setCurrentAngle(angle);
child.setDegY(deg);
Calculate3DPosition(child, getWidth(), angle);
}
mRecycler.clear();
invalidate();
}
private void updateSelectedItemMetadata()
{
View oldSelectedChild = mSelectedChild;
View child = mSelectedChild = getChildAt(mSelectedPosition - mFirstPosition);
if (child == null)
{
return;
}
child.setSelected(true);
child.setFocusable(true);
if (hasFocus())
{
child.requestFocus();
}
if (oldSelectedChild != null)
{
oldSelectedChild.setSelected(false);
oldSelectedChild.setFocusable(false);
}
}
}
Demo測試類AndroidActivity.java
package com.john.carousel.test;
import com.john.carousel.lib.Carousel;
import com.john.carousel.lib.Carousel.CarouselItemClickListener;
import com.john.carousel.lib.CarouselAdapter;
import com.john.carousel.lib.CarouselAdapter.cOnItemClickListener;
import com.john.carousel.lib.Constants;
import com.john.carousel.lib.R;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnKeyListener;
import android.widget.LinearLayout;
public class AndroidActivity extends Activity implements CarouselItemClickListener, Constants
{
private Carousel carousel;
private final String TAG = AndroidActivity.class.getSimpleName();
private LinearLayout layoutMain = null;
private final int NETWORK = 0;
private final int UPDATE = 1;
private final int APK = 2;
private final int STB = 3;
private final int OTHER = 4;
private final int WALLPAPER = 5;
private final int MEDIA = 6;
private int initSelection = 2;
private long lastClickTime, currClickTime;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
View mainView = LayoutInflater.from(this).inflate(R.layout.activity_android, null);
setContentView(mainView);
if (getIntent() != null) {
initSelection = getIntent().getExtras().getInt("selection", 2);
}
if (initSelection >= 6 || initSelection <= 0)
{
initSelection = initSelection % 7;
}
buildView();
}
private void buildView()
{
carousel = (Carousel) findViewById(R.id.carousel);
layoutMain = (LinearLayout) findViewById(R.id.layoutMain);
layoutMain.setBackground(getResources().getDrawable(R.drawable.main_back00));
carousel.setDrawingCacheEnabled(true);
carousel.setGravity(Gravity.TOP);
carousel.setFocusFlag(true);
carouselGetFocus();
carousel.setSelected(initSelection);
carousel.setCarouselItemClickCallBack(this);
carousel.setOnItemClickListener(new cOnItemClickListener()
{
@Override
public void onItemClick(CarouselAdapter> parent, View view, int position, long id)
{
onItemClickOrCallback(position);
}
});
carousel.setOnKeyListener(new OnKeyListener()
{
@Override
public boolean onKey(View v, int keyCode, KeyEvent event)
{
if (event.equals(KeyEvent.ACTION_DOWN))
{
switch (keyCode)
{
case KEY_LEFT:
carousel.toNextLeftItem();
break;
case KEY_RIGHT:
carousel.toNextRightItem();
break;
case KEY_OK:
case KEY_CENTER:
onItemClickOrCallback(carousel.getIndex());
break;
}
}
carouselGetFocus();
return true;
}
});
}
private void onItemClickOrCallback(int position)
{
switch (position)
{
case NETWORK:
break;
case UPDATE:
break;
case APK:
break;
case STB:
break;
case OTHER:
break;
case WALLPAPER:
break;
case MEDIA:
break;
default:
break;
}
}
@Override
public void CarouselClickCallBack(int itemPosition)
{
onItemClickOrCallback(itemPosition);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
switch (keyCode)
{
case KEY_OK:
case KEY_CENTER:
onItemClickOrCallback(carousel.getIndex());
return true;
case KEY_LEFT:
if (carousel.getFocusFlag())
{
currClickTime = System.currentTimeMillis();
if (currClickTime - lastClickTime > 200)
{
lastClickTime = currClickTime;
carousel.toNextLeftItem();
Log.d("selectedItemIndex", carousel.getIndex() + "");
return true;
}
else
{
return true;
}
}
break;
case KEY_RIGHT:
if (carousel.getFocusFlag())
{
currClickTime = System.currentTimeMillis();
if (currClickTime - lastClickTime > 200)
{
lastClickTime = currClickTime;
carousel.toNextRightItem();
Log.d("selectedItemIndex", carousel.getIndex() + "");
return true;
}
else
{
return true;
}
}
break;
case KEY_UP:
carousel.setFocusFlag(false);
carousel.clearFocus();
carousel.setFocusable(false);
carousel.setSelected(false);
return true;
case KEY_DOWN:
if (!carousel.getFocusFlag())
{
Log.e(TAG, "KEY_DOWN");
carouselGetFocus();
}
return true;
case KEY_EXIT:
return true;
case KEY_VOLDOWN:
case KEY_VOLUP:
case KEY_MUTE:
case KEY_VOLUME_MUTE:
return true;
}
return super.onKeyDown(keyCode, event);
}
private void carouselGetFocus()
{
carousel.setFocusFlag(true);
carousel.requestFocus();
carousel.setFocusable(true);
}
}
以上就是這篇文章的全部内容了，希望本文的内容對大家的學習或者工作具有一定的參考學習價值，如果有疑問大家可以留言交流，謝謝大家對腳本之家的支援。
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