为activity增加左右手势识别（scrollview，gridview，listview适用）

本文介绍如何使用手势检测实现Activity间的快速切换，通过检测左右手势触发不同的操作。

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 /* 
 
    
 *  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 
 
 * 4.import android.view.GestureDetector;
 import android.view.GestureDetector.OnGestureListener; 
 
    
 */ 
 
  privateGestureDetector mGestureDetector;
 privateint verticalMinDistance = 180;
 privateint minVelocity         = 0;
 
 privatevoid initGesture() {
     mGestureDetector = newGestureDetector((OnGestureListener) this);
 }
 
 publicboolean onFling(MotionEvent e1, MotionEvent e2, floatvelocityX, floatvelocityY) {
 
     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();
     }elseif (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();
 //activty切换动画
         overridePendingTransition(R.anim.push_right_in, R.anim.push_right_out);
     }
 
     returnfalse;
 }
  
 @Override
 publicvoid onLongPress(MotionEvent arg0) {
     // TODO Auto-generated method stub
      
 }
 
 @Override
 publicboolean onScroll(MotionEvent arg0, MotionEvent arg1, floatarg2,
         floatarg3) {
     // TODO Auto-generated method stub
     returnfalse;
 }
 
 @Override
 publicvoid onShowPress(MotionEvent arg0) {
     // TODO Auto-generated method stub
      
 }
 
 @Override
 publicboolean onSingleTapUp(MotionEvent arg0) {
     // TODO Auto-generated method stub
     returnfalse;
 }
 
 @Override
 publicboolean onTouch(View v, MotionEvent event) {
     // TODO Auto-generated method stub
 // 触摸事件设置位mGestureDetector
     returnmGestureDetector.onTouchEvent(event);
 }
 
 @Override
 publicboolean onDown(MotionEvent arg0) {
     // TODO Auto-generated method stub
     returnfalse;
 }
  
 @Override 
 publicboolean dispatchTouchEvent(MotionEvent ev) {
// 把触摸事件分配给GestureDetector,重点一
     mGestureDetector.onTouchEvent(ev);
     returnsuper.dispatchTouchEvent(ev);
} 
 
 
 
 