GestureListener无法识别

问题描述：

我有一个GestureListener无法识别

定制View有圈，以及在
MainActivity

我显示自定义View，它的工作原理。我可以看到这个圈子。

我已经实现在View的OnGestureListener，但它不被识别。所有的手势方法都不会被调用。

我在做什么错？

代码：

MainActivity：

package com.example.testpath; 

import android.app.Activity; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.widget.LinearLayout; 
import android.widget.RelativeLayout; 

public class MainActivity extends Activity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     RelativeLayout rlayout = (RelativeLayout) findViewById(getResourceId("main","id")); 
     WorldMap worldmap = new WorldMap(this); 
     rlayout.addView(worldmap); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 
    public int getResourceId(String pVariableName, String pResourcename) 
    { 
     try { 
      return getResources().getIdentifier(pVariableName, pResourcename, getPackageName()); 
     } catch (Exception e) { 
      e.printStackTrace(); 
      return -1; 
     } 
    } 
}

定制View：

package com.example.testpath; 

import android.content.Context; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.util.Log; 
import android.view.GestureDetector.OnGestureListener; 
import android.view.MotionEvent; 
import android.view.View; 

public class WorldMap extends View implements OnGestureListener{ 

// private GestureDetector gestureScanner; 

    static float translatex = -2200; 
    static float translatey = -1500; 

    public WorldMap(Context context) { 
     super(context); 
     // TODO Auto-generated constructor stub 
    } 


    protected void onDraw(Canvas canvas) { 
      super.onDraw(canvas); 
      Paint paint = new Paint(); 
      canvas.translate(translatex,translatey); 
      paint.setColor(Color.RED); 
      canvas.drawCircle(100, 100, 50, paint); 
      paint.setColor(Color.BLUE); 
      canvas.drawCircle(2290, 1590, 50, paint); 
     } 


    @Override 
    public boolean onDown(MotionEvent e) { 
     // TODO Auto-generated method stub 
Log.v("DEBUG TEST", "onDown "); 
     return false; 
    } 

    @Override 
    public void onShowPress(MotionEvent e) { 
     // TODO Auto-generated method stub 
Log.v("DEBUG TEST", "onShowPress "); 

    } 

    @Override 
    public boolean onSingleTapUp(MotionEvent e) { 
     // TODO Auto-generated method stub 
     Log.v("DEBUG TEST", "onSingleTapUp "); 
     return false; 
    } 

    @Override 
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { 
     // TODO Auto-generated method stub 
     float vx = e1.getRawX(); 
     float vy = e1.getRawY(); 
     Log.v("DEBUG TEST", "onScroll : " + vx + " " + vy); 
     translatex=translatex+vx; 
     translatey=translatey+vy; 
     invalidate(); 
     return false; 
    } 

    @Override 
    public void onLongPress(MotionEvent e) { 
     Log.v("DEBUG TEST", "onLongPress "); 
     // TODO Auto-generated method stub 
    } 

    @Override 
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { 
     // TODO Auto-generated method stub 
     Log.v("DEBUG TEST", "onFling "); 
     return false; 
    } 
}

答

声明一个GestureDetector在WorldMap：

private GestureDetector detector;

初始化：

public WorldMap(Context context) { 
    super(context); 
    detector = new GestureDetector(context, this); 
}

，并覆盖onTouchEvent()：

@Override 
public boolean onTouchEvent(MotionEvent event) { 
    detector.onTouchEvent(event); 
    return super.onTouchEvent(event); 
}

请参阅开发指南中的Detecting Common Gestures。

GestureListener无法识别

相关推荐