手势识别器

//1.定义一个手势识别器
private GestureDetector mGestureDetector;

//2.初始化手势识别器
mGestureDetector = new GestureDetector(this, new GestureDetector.SimpleOnGestureListener(){

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2,
float velocityX, float velocityY) {
if(Math.abs(velocityX)<100){
Log.i(TAG,"滑动的太慢,不是有效的事件");
return true;
}
if(e2.getRawX()-e1.getRawX()>200){
  //todo
return true;
}

if(e1.getRawX()-e2.getRawX()>200){

//todo
return true;
}

return super.onFling(e1, e2, velocityX, velocityY);
}

});

//3.让手势识别器生效
@Override
public boolean onTouchEvent(MotionEvent event) {
mGestureDetector.onTouchEvent(event);
return super.onTouchEvent(event);
}