设置GestureDetector所有子视图(Set GestureDetector to all

我想补充一个GestureDetector到活动的所有视图（图组），而无需手动在分配给每一个视图。眼下onFling（）刷在背景上时才会被激活，但是，如不Button1的刷卡时。

package com.app.example;

import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.LinearLayout;

public class ExampleActivity extends Activity {
    Context mContext = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mContext = this;

        LinearLayout parent = new LinearLayout(mContext);
        parent.setOrientation(LinearLayout.VERTICAL);
        parent.setBackgroundColor(Color.RED);

        Button button1 = new Button(mContext);
        button1.setText("Button 1");
        Button button2 = new Button(mContext);
        button2.setText("Button 2");

        parent.addView(button1);
        parent.addView(button2);

        final GestureDetector gestureDetector = new GestureDetector(
                new MyGestureDetector());

        parent.setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                gestureDetector.onTouchEvent(event);

                return true;
            }
        });

        setContentView(parent);
    }
}

class MyGestureDetector extends SimpleOnGestureListener {

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2,
            float velocityX, float velocityY) {

        // right to left
        if(e1.getX() - e2.getX() > 10 && Math.abs(velocityX) > 20) {
            Log.i("onFling", "right to left");

            return false;

        // left to right
        }  else if (e2.getX() - e1.getX() > 10 && Math.abs(velocityX) > 20) {
            Log.i("onFling", "left to right");

            return false; 
        }

        return false;
    }

}

您可以使用GestureOverlayView看到previus计算器后如何使用它。