33.手势识别器

一、Activity中

protected GestureDetector mGestureDetector;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

//1.创建一个手势识别器 new 对象
mGestureDetector = new GestureDetector(new GestureDetector.SimpleOnGestureListener(){
//当手指在屏幕上滑动的时候 调用的方法.
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2,
float velocityX, float velocityY) {
if(e1.getRawX() - e2.getRawX() > 200){

//showNext();

return true;
}

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

//showPre();

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


}


//2.让手势识别器生效
@Override
public boolean onTouchEvent(MotionEvent event) {
mGestureDetector.onTouchEvent(event);
return super.onTouchEvent(event);
}