/*  *  for左右手势  *  1.复制下面的内容到目标Activity  *  2.目标Activity的onCreate()调用initGesture()  *  3.目标Activity需implements OnTouchListener, OnGestureListener  */    private GestureDetector mGestureDetector;    private int verticalMinDistance = 180;    private int minVelocity         = 0;    private void initGesture() {     mGestureDetector = new GestureDetector((OnGestureListener) this);    }   public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {        if (e1.getX() - e2.getX() > verticalMinDistance && Math.abs(velocityX) > minVelocity) {            // 切换Activity            // Intent intent = new Intent(ViewSnsActivity.this, UpdateStatusActivity.class);            // startActivity(intent);            //Toast.makeText(this, "向左手势", Toast.LENGTH_SHORT).show();        } else if (e2.getX() - e1.getX() > verticalMinDistance && Math.abs(velocityX) > minVelocity) {            // 切换Activity            // Intent intent = new Intent(ViewSnsActivity.this, UpdateStatusActivity.class);            // startActivity(intent);         //Toast.makeText(this, "向右手势", Toast.LENGTH_SHORT).show();            finish();            overridePendingTransition(R.anim.push_right_in, R.anim.push_right_out);        }        return false;    } @Override public void onLongPress(MotionEvent arg0) {  // TODO Auto-generated method stub } @Override public boolean onScroll(MotionEvent arg0, MotionEvent arg1, float arg2,   float arg3) {  // TODO Auto-generated method stub  return false; } @Override public void onShowPress(MotionEvent arg0) {  // TODO Auto-generated method stub } @Override public boolean onSingleTapUp(MotionEvent arg0) {  // TODO Auto-generated method stub  return false; } @Override public boolean onTouch(View v, MotionEvent event) {  // TODO Auto-generated method stub  return mGestureDetector.onTouchEvent(event); } @Override public boolean onDown(MotionEvent arg0) {  // TODO Auto-generated method stub  return false; } @Override  public boolean dispatchTouchEvent(MotionEvent ev) {  mGestureDetector.onTouchEvent(ev);  return super.dispatchTouchEvent(ev);   } 

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<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android">     <translate android:fromXDelta="0" android:toXDelta="100%p"         android:duration="500" />     <alpha android:fromAlpha="1.0" android:toAlpha="0.1"         android:duration="500"/> </set>