GestureListener wird nicht erkannt

Question

Ich habe einen

• individuelle View mit einem Kreis in ihm
• MainActivity

ich die Anzeige der benutzerdefinierten View, die funktioniert. Ich kann den Kreis sehen.

Ich habe die OnGestureListener in der View implementiert, aber es wird nicht erkannt. Alle Gestenmethoden werden nie aufgerufen.

Was mache ich falsch?

Code:

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; 
     } 
    } 
} 

Individuelle 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; 
    } 
} 

Answer 1

Deklarieren Sie eine GestureDetector in WorldMap:

private GestureDetector detector; 

es initialisieren:

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

Und außer Kraft setzen onTouchEvent():

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

Prüfen auf Detecting Common Gestures den Entwicklerleitfaden heraus.