android 横向滑动事件,android左右手势滑动事件处理
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要實(shí)現(xiàn)手指在屏幕上左右滑動(dòng)的事件需要實(shí)例化對(duì)象GestureDetector，new GestureDetector(MainActivity.this,onGestureListener);首先實(shí)現(xiàn)監(jiān)聽對(duì)象GestureDetector.OnGestureListener，根據(jù)x或y軸前后變化坐標(biāo)來判斷是左滑動(dòng)還是右滑動(dòng)并根據(jù)不同手勢(shì)滑動(dòng)做出事件處理doResult(int action)，
然后覆寫onTouchEvent方法，在onTouchEvent方法中將event對(duì)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. */
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() {
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;
}
}
}
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