android左右手势滑动事件处理

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要实现手指在屏幕上左右滑动的事件须要实例化对象GestureDetector，new GestureDetector(MainActivity.this,onGestureListener);首先实现监听对象GestureDetector.OnGestureListener，根据x或y轴先后变化坐标来判断是左滑动仍是右滑动并根据不一样手势滑动作出事件处理doResult（int action），

而后覆写onTouchEvent方法，在onTouchEvent方法中将event对象传给gestureDetector.onTouchEvent(event);处理。

代码例：

import android.view.GestureDetector;

 

public class MainActivity extends TabActivity implements OnClickListener {

 

final int RIGHT = 0;

final int LEFT = 1;

private GestureDetector gestureDetector;

 

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

requestWindowFeature(Window.FEATURE_NO_TITLE);

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

 

gestureDetector = new GestureDetector(MainActivity.this,onGestureListener);

}

 

private GestureDetector.OnGestureListener onGestureListener =

new GestureDetector.SimpleOnGestureListener() {

@Override

public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,

float velocityY) {

float x = e2.getX() - e1.getX();

float y = e2.getY() - e1.getY();

 

if (x > 0) {

doResult(RIGHT);

} else if (x < 0) {

doResult(LEFT);

}

return true;

}

};

 

public boolean onTouchEvent(MotionEvent event) {

return gestureDetector.onTouchEvent(event);

}

 

public void doResult(int action) {

 

switch (action) {

case RIGHT:

System.out.println("go right");

break;

 

case LEFT:

System.out.println("go left");

break;

 

}

}

}