Android仿Launcher效果

效果1

Android仿Launcher效果

效果2

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.cn.npass.nj"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="10" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:label="@string/app_name"
            android:name=".MainActivity" >
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

scroll_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/myView"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_weight="1" >

    <com.cn.npass.nj.ScrollViewGroup
        android:id="@+id/scrollViewGroup"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

    <com.cn.npass.nj.PageControlView
        android:id="@+id/pageControl"
        android:layout_width="fill_parent"
        android:layout_height="80px"
        android:layout_alignParentBottom="true"
        android:background="#8f00000f"
        android:gravity="center" />

</RelativeLayout>

scroll_layout_0.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="請輸入姓名：" />

    <EditText
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="" />

    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="送出" />

</LinearLayout>

MainActivity.java

package com.cn.npass.nj;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;

/**
 */
public class MainActivity extends Activity {

	@SuppressWarnings("unused")
	private static final String TAG = "scroller";

	private ScrollViewGroup viewGroup;

	private PageControlView pageControl;
	private int[] argImages = {
		R.drawable.a1,
		R.drawable.a2,
		R.drawable.a3,
		R.drawable.a4
	};

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.scroll_main);
		viewGroup = (ScrollViewGroup) findViewById(R.id.scrollViewGroup);

		ImageView imageView = new ImageView(this);
		imageView.setImageDrawable(getResources().getDrawable(R.drawable.a1));
		viewGroup.addView(imageView);

		viewGroup.addView(View.inflate(this, R.layout.scroll_layout_0, null));

		imageView = new ImageView(this);
		imageView.setImageDrawable(getResources().getDrawable(R.drawable.a1));
		viewGroup.addView(imageView);
		
		imageView = new ImageView(this);
		imageView.setImageDrawable(getResources().getDrawable(R.drawable.ic_launcher));
		viewGroup.addView(imageView);
		
		for (int i = 0; i < argImages.length; i++) {
			
			imageView = new ImageView(this);
			imageView.setImageDrawable(getResources().getDrawable(argImages[i]));
			viewGroup.addView(imageView);
		}
		
		// 設定圖檔填充ImageView
		//imageView.setScaleType(ScaleType.CENTER);

		viewGroup.setCurrentScreenIndex(0);
		

		pageControl = (PageControlView) findViewById(R.id.pageControl);
		pageControl.bindScrollViewGroup(viewGroup);

	}
	

}

PageControlView.java

package com.cn.npass.nj;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.ImageView;
import android.widget.LinearLayout;

import com.cn.npass.nj.ScrollViewGroup.OnScreenChangeListener;


/**
 */
public class PageControlView extends LinearLayout {
	private Context context;

	private int count;

	public void bindScrollViewGroup(ScrollViewGroup scrollViewGroup) {
		this.count = scrollViewGroup.getChildCount();
		generatePageControl(scrollViewGroup.getCurrentScreenIndex());

		scrollViewGroup.setOnScreenChangeListener(new OnScreenChangeListener() {

			@Override
			public void onScreenChange(int currentIndex) {
				generatePageControl(currentIndex);
			}
		});
	}

	public PageControlView(Context context) {
		super(context);
		this.init(context);
	}

	public PageControlView(Context context, AttributeSet attrs) {
		super(context, attrs);
		this.init(context);
	}

	private void init(Context context) {
		this.context = context;
	}

	private void generatePageControl(int currentIndex) {
		this.removeAllViews();

		for (int i = 0; i < this.count; i++) {
			ImageView imageView = new ImageView(context);
			if (currentIndex == i) {
				imageView.setImageResource(R.drawable.page_indicator_focused);
			} else {
				imageView.setImageResource(R.drawable.page_indicator);
			}
			this.addView(imageView);
		}
	}
}

ScrollViewGroup.java

package com.cn.npass.nj;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.widget.Scroller;

/**
 */
public class ScrollViewGroup extends ViewGroup {

	private static final String TAG = "scroller";

	private Scroller scroller;

	private int currentScreenIndex;//目前屏的索引
	
	public int getCurrentScreenIndex() {
		return currentScreenIndex;
	}

	public void setCurrentScreenIndex(int currentScreenIndex) {
		this.currentScreenIndex = currentScreenIndex;
	}

	private GestureDetector gestureDetector;

	// 設定一個标志位，防止底層的onTouch事件重複處理UP事件
	private boolean fling;

	public ScrollViewGroup(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		initView(context);
	}

	public ScrollViewGroup(Context context, AttributeSet attrs) {
		super(context, attrs);
		initView(context);
	}

	public ScrollViewGroup(Context context) {
		super(context);
		initView(context);
	}

	private void initView(final Context context) {
		this.scroller = new Scroller(context);

		this.gestureDetector = new GestureDetector(new OnGestureListener() {

			@Override
			public boolean onSingleTapUp(MotionEvent e) {
				return false;
			}

			@Override
			public void onShowPress(MotionEvent e) {
			}

			@Override
			public boolean onScroll(MotionEvent e1, MotionEvent e2,
					float distanceX, float distanceY) {
				if ((distanceX > 0 && currentScreenIndex < getChildCount() - 1)// 防止移動過最後一頁
						|| (distanceX < 0 && getScrollX() > 0)) {// 防止向第一頁之前移動
					scrollBy((int) distanceX, 0);
				}
				return true;
			}

			@Override
			public void onLongPress(MotionEvent e) {
			}

			@Override
			public boolean onFling(MotionEvent e1, MotionEvent e2,
					float velocityX, float velocityY) {
				Log.d(TAG, "min velocity >>>"
						+ ViewConfiguration.get(context)
								.getScaledMinimumFlingVelocity()
						+ " current velocity>>" + velocityX);
				// 判斷是否達到最小輕松速度，取絕對值的
				if (Math.abs(velocityX) > ViewConfiguration.get(context)
						.getScaledMinimumFlingVelocity()) {
					if (velocityX > 0 && currentScreenIndex > 0) {// 手指從左往右劃
						Log.d(TAG, ">>>>fling to left");
						fling = true;
						scrollToScreen(currentScreenIndex - 1);
					} else if (velocityX < 0
							&& currentScreenIndex < getChildCount() - 1) {
						Log.d(TAG, ">>>>fling to right");
						fling = true;
						scrollToScreen(currentScreenIndex + 1);
					}
				}

				return true;
			}

			@Override
			public boolean onDown(MotionEvent e) {
				return false;
			}
		});

	}

	@Override
	protected void onLayout(boolean changed, int left, int top, int right,
			int bottom) {
		Log.d(TAG, ">>left: " + left + " top: " + top + " right: " + right
				+ " bottom:" + bottom);
		/**
		 * 設定布局，将子視圖順序橫屏排列
		 */
		for (int i = 0; i < getChildCount(); i++) {
			View child = getChildAt(i);
			child.setVisibility(View.VISIBLE);
			child.measure(right - left, bottom - top);
			child.layout(0 + i * getWidth(), 0, getWidth() + i * getWidth(),
					getHeight());
		}
		// 初始化顯示第幾個界面
		int delta = currentScreenIndex * getWidth() - getScrollX();
		scroller.startScroll(getScrollX(), 0, delta, 0, 0);
		invalidate();
	}

	@Override
	public void computeScroll() {
		if (scroller.computeScrollOffset()) {
			scrollTo(scroller.getCurrX(), 0);
			postInvalidate();
		}
	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {
		gestureDetector.onTouchEvent(event);
		
		switch (event.getAction()) {
		case MotionEvent.ACTION_DOWN:
			break;
		case MotionEvent.ACTION_MOVE:
			break;
		case MotionEvent.ACTION_UP:
			if (!fling) {
				snapToDestination();
			}
			fling = false;
			break;
		default:
			break;
		}
		return true;
	}
	
	/**
	 * 切換到指定屏
	 * 
	 * @param whichScreen
	 */
	private void scrollToScreen(int whichScreen) {
		if (getFocusedChild() != null && whichScreen != currentScreenIndex
				&& getFocusedChild() == getChildAt(currentScreenIndex)) {
			getFocusedChild().clearFocus();
		}

		final int delta = whichScreen * getWidth() - getScrollX();
		scroller.startScroll(getScrollX(), 0, delta, 0, Math.abs(delta) * 2);
		invalidate();

		currentScreenIndex = whichScreen;
		if (onScreenChangeListener != null) {
			onScreenChangeListener.onScreenChange(currentScreenIndex);
		}
	}

	/**
	 * 根據目前x坐标位置确定切換到第幾屏
	 */
	private void snapToDestination() {
		scrollToScreen((getScrollX() + (getWidth() / 2)) / getWidth());
	}

	public interface OnScreenChangeListener {
		void onScreenChange(int currentIndex);
	}

	private OnScreenChangeListener onScreenChangeListener;

	public void setOnScreenChangeListener(
			OnScreenChangeListener onScreenChangeListener) {
		this.onScreenChangeListener = onScreenChangeListener;
	}
}

資源下載下傳位址為:http://download.csdn.net/detail/niejing654092427/4500937

Android仿Launcher效果

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