android左右手勢滑動事件處理

建了個交流羣：416157653，歡迎你們加入討論

要實現手指在屏幕上左右滑動的事件須要實例化對象GestureDetector，new GestureDetector(MainActivity.this,onGestureListener);首先實現監聽對象GestureDetector.OnGestureListener，根據x或y軸先後變化座標來判斷是左滑動仍是右滑動並根據不一樣手勢滑動作出事件處理doResult（int action），

而後覆寫onTouchEvent方法，在onTouchEvent方法中將event對象傳給gestureDetector.onTouchEvent(event);處理。

代碼例：

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;

 

}

}

}