我想将GestureDetector添加到活动的所有视图(视图组),而不是手动将其分配给每个视图。现在onFling()仅在向后滑动时激活,但在滑动时不激活。按钮1。
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;
}
}