解析Android中实现滑动翻页之ViewFlipper的使用详解

public class ViewFlipperActivity extends Activity implements OnGestureListener { 

    private static final int FLING_MIN_DISTANCE = 100; 
    private ViewFlipper flipper; 
    private GestureDetector detector; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.viewflipper); 
        // 注册一个GestureDetector  
        detector = new GestureDetector(this); 
        flipper = (ViewFlipper) findViewById(R.id.ViewFlipper); 
        ImageView image1 = new ImageView(this); 
        image1.setBackgroundResource(R.drawable.image1); 
        // 增加第一个view  
        flipper.addView(image1); 
        ImageView image2 = new ImageView(this); 
        image2.setBackgroundResource(R.drawable.image2); 
        // 增加第二个view  
        flipper.addView(image2); 
    } 

    @Override 
    public boolean onTouchEvent(MotionEvent event) { 
        // 将触屏事件交给手势识别类处理  
        return this.detector.onTouchEvent(event); 
    } 

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

    @Override 
    public void onShowPress(MotionEvent e) { 
    } 

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

    @Override 
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, 
            float distanceY) { 
        return false; 
    } 

    @Override 
    public void onLongPress(MotionEvent e) { 
    } 

    @Override 
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, 
            float velocityY) { 
        if (e1.getX() - e2.getX() > FLING_MIN_DISTANCE) { 
            //设置View进入和退出的动画效果  
            this.flipper.setInAnimation(AnimationUtils.loadAnimation(this, 
                    R.anim.left_in)); 
            this.flipper.setOutAnimation(AnimationUtils.loadAnimation(this, 
                    R.anim.left_out)); 
            this.flipper.showNext(); 
            return true; 
        } 
        if (e1.getX() - e2.getX() <-FLING_MIN_DISTANCE) { 
            this.flipper.setInAnimation(AnimationUtils.loadAnimation(this, 
                    R.anim.right_in)); 
            this.flipper.setOutAnimation(AnimationUtils.loadAnimation(this, 
                    R.anim.right_out)); 
            this.flipper.showPrevious(); 
            return true; 
        } 
        return false; 
    } 
}