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

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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);}

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