难以实现手势控制

Question

我正在尝试学习 android 应用中的手势检测。但显然，在使用 onFling 方法时，我在 logcat 中什么也得不到。我已经在主要 class 上实现了 GestureDetector.OnGestureListener。我从这里看到了手势检测的例子： https://developer.android.com/training/gestures/detector.html#detect

package com.persi.fragmenttester;
import android.content.Intent;
import android.support.v4.view.GestureDetectorCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;

public class MainActivity extends AppCompatActivity implements GestureDetector.OnGestureListener,
        GestureDetector.OnDoubleTapListener{

    private GestureDetectorCompat mDetector;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mDetector=new GestureDetectorCompat(this,this);
        mDetector.setOnDoubleTapListener(this);


    }


    @Override
    public boolean onSingleTapConfirmed(MotionEvent e) {
        return false;
    }

    @Override
    public boolean onDoubleTap(MotionEvent e) {
        Log.d("App",e.toString());
        return true;
    }

    @Override
    public boolean onDoubleTapEvent(MotionEvent e) {
        return false;
    }

    @Override
    public boolean onDown(MotionEvent e) {
        return false;
    }

    @Override
    public void onShowPress(MotionEvent e) {

    }

    @Override
    public boolean onSingleTapUp(MotionEvent e) {
        return false;
    }

    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
        return false;
    }

    @Override
    public void onLongPress(MotionEvent e) {
        Log.d("App",e.toString());

    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        Log.d("App", "onFling: " + e1.toString() + e2.toString());
        return true;

    }
}

Answer 1

您需要覆盖 onTouchEvent()

@Override
public boolean onTouchEvent(MotionEvent event){
    if (this.mDetector.onTouchEvent(event)) {
        return true;
    }
    return super.onTouchEvent(event);
}

来自文档：

To make it possible for your GestureDetector object to receive events, you override the View or Activity's onTouchEvent() method, and pass along all observed events to the detector instance.

难以实现手势控制

Difficulty in implementing gesture controls

android

gesture