Android手势识别ViewFlipper触摸动画

         最近项目中用到了ViewFlipper这个类，感觉效果真的很炫，今天自己也试着做了下，确实还不错。

           首先在layout下定义viewflipper.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" >        <ViewFlipper          android:id="@+id/viewFlipper1"          android:layout_width="fill_parent"          android:layout_height="fill_parent" >            <ImageView              android:id="@+id/imageView1"              android:layout_width="fill_parent"              android:layout_height="fill_parent"              android:src="@drawable/b" />           <ImageView              android:id="@+id/imageView2"              android:layout_width="fill_parent"              android:layout_height="fill_parent"              android:src="@drawable/c" />            <ImageView              android:id="@+id/imageView3"              android:layout_width="fill_parent"              android:layout_height="fill_parent"              android:src="@drawable/d" />            <ImageView              android:id="@+id/imageView4"              android:layout_width="fill_parent"              android:layout_height="fill_parent"              android:src="@drawable/f" />           <ImageView              android:id="@+id/imageView5"              android:layout_width="fill_parent"              android:layout_height="fill_parent"              android:src="@drawable/g" />      </ViewFlipper>    </LinearLayout>

public class ViewFlipperActivity extends Activity implements OnTouchListener, android.view.GestureDetector.OnGestureListener {      private ViewFlipper flipper;      GestureDetector mGestureDetector;        private int mCurrentLayoutState;        private static final int FLING_MIN_DISTANCE = 80;        private static final int FLING_MIN_VELOCITY = 150;     @Override   protected void onCreate(Bundle savedInstanceState) {    // TODO Auto-generated method stub    super.onCreate(savedInstanceState);    setContentView(R.layout.viewflipper);        flipper=(ViewFlipper) this.findViewById(R.id.viewFlipper1);     //注册一个用于手势识别的类            mGestureDetector = new GestureDetector(this);            //给mFlipper设置一个listener            flipper.setOnTouchListener(this);            mCurrentLayoutState = 0;            //允许长按住ViewFlipper,这样才能识别拖动等手势            flipper.setLongClickable(true);               }   /**         * 此方法在本例中未用到，可以指定跳转到某个页面         * @param switchTo         */        public void switchLayoutStateTo(int switchTo) {            while (mCurrentLayoutState != switchTo)   {                if (mCurrentLayoutState > switchTo) {                    mCurrentLayoutState--;                    flipper.setInAnimation(inFromLeftAnimation());                    flipper.setOutAnimation(outToRightAnimation());                    flipper.showPrevious();                } else {                    mCurrentLayoutState++;                    flipper.setInAnimation(inFromRightAnimation());                    flipper.setOutAnimation(outToLeftAnimation());                    flipper.showNext();                }                 }           }       /**         * 定义从右侧进入的动画效果         * @return         */        protected Animation inFromRightAnimation() {            Animation inFromRight = new TranslateAnimation(                    Animation.RELATIVE_TO_PARENT, +1.0f,                    Animation.RELATIVE_TO_PARENT, 0.0f,                    Animation.RELATIVE_TO_PARENT, 0.0f,                    Animation.RELATIVE_TO_PARENT, 0.0f);            inFromRight.setDuration(200);            inFromRight.setInterpolator(new AccelerateInterpolator());            return inFromRight;        }             /**         * 定义从左侧退出的动画效果         * @return         */        protected Animation outToLeftAnimation() {            Animation outtoLeft = new TranslateAnimation(                    Animation.RELATIVE_TO_PARENT, 0.0f,                    Animation.RELATIVE_TO_PARENT, -1.0f,                    Animation.RELATIVE_TO_PARENT, 0.0f,                    Animation.RELATIVE_TO_PARENT, 0.0f);            outtoLeft.setDuration(200);            outtoLeft.setInterpolator(new AccelerateInterpolator());            return outtoLeft;        }             /**         * 定义从左侧进入的动画效果         * @return         */        protected Animation inFromLeftAnimation() {            Animation inFromLeft = new TranslateAnimation(                    Animation.RELATIVE_TO_PARENT, -1.0f,                    Animation.RELATIVE_TO_PARENT, 0.0f,                    Animation.RELATIVE_TO_PARENT, 0.0f,                    Animation.RELATIVE_TO_PARENT, 0.0f);            inFromLeft.setDuration(200);            inFromLeft.setInterpolator(new AccelerateInterpolator());            return inFromLeft;        }              /**         * 定义从右侧退出时的动画效果         * @return         */        protected Animation outToRightAnimation() {            Animation outtoRight = new TranslateAnimation(                    Animation.RELATIVE_TO_PARENT, 0.0f,                    Animation.RELATIVE_TO_PARENT, +1.0f,                    Animation.RELATIVE_TO_PARENT, 0.0f,                    Animation.RELATIVE_TO_PARENT, 0.0f);            outtoRight.setDuration(200);            outtoRight.setInterpolator(new AccelerateInterpolator());            return outtoRight;        }           public boolean onDown(MotionEvent e) {    // TODO Auto-generated method stub    return false;   }   /*         * 用户按下触摸屏、快速移动后松开即触发这个事件         * e1：第1个ACTION_DOWN MotionEvent         * e2：最后一个ACTION_MOVE MotionEvent         * velocityX：X轴上的移动速度，像素/秒         * velocityY：Y轴上的移动速度，像素/秒         * 触发条件 ：         * X轴的坐标位移大于FLING_MIN_DISTANCE，且移动速度大于FLING_MIN_VELOCITY个像素/秒         */   public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,     float velocityY) {     if (e1.getX() - e2.getX() > FLING_MIN_DISTANCE                     && Math.abs(velocityX) > FLING_MIN_VELOCITY) {                 // 当像左侧滑动的时候                 //设置View进入屏幕时候使用的动画                 flipper.setInAnimation(inFromRightAnimation());                 //设置View退出屏幕时候使用的动画                 flipper.setOutAnimation(outToLeftAnimation());                 flipper.showNext();             } else if (e2.getX() - e1.getX() > FLING_MIN_DISTANCE                     && Math.abs(velocityX) > FLING_MIN_VELOCITY) {                 // 当像右侧滑动的时候                 flipper.setInAnimation(inFromLeftAnimation());                 flipper.setOutAnimation(outToRightAnimation());                 flipper.showPrevious();             }             return false;     }   public void onLongPress(MotionEvent e) {    // TODO Auto-generated method stub       }   public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,     float distanceY) {    // TODO Auto-generated method stub    return false;   }   public void onShowPress(MotionEvent e) {    // TODO Auto-generated method stub       }   public boolean onSingleTapUp(MotionEvent e) {    // TODO Auto-generated method stub    return false;   }   public boolean onTouch(View v, MotionEvent event) {    // TODO Auto-generated method stub      // 一定要将触屏事件交给手势识别类去处理（自己处理会很麻烦的）            return mGestureDetector.onTouchEvent(event);     }        }