Comment mettre à jour la position d'un bitmap Android dessiné sur canvas avec un événement onTouch?

Question

J'essaie de mettre à jour la position d'un bitmap avec un événement onTouch. L'image s'affiche correctement dans l'emplacement initial. Les journaux montrent que l'événement onTouch met à jour les coordonnées et indique également que onDraw est appelé.

Mon activité:

package com.miker.haminvaders; 

import android.app.Activity; 
import android.os.Bundle; 

public class HamInvadersActivity extends Activity 
{ 
    private DrawView drawView; 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    drawView = (DrawView) findViewById(R.id.drawView);  

    } 
    @Override 
    public void onPause() 
    { 
    super.onPause(); 
    drawView.stopGame(); 

    } 
    @Override 
    protected void onDestroy() 
    { 
    super.onDestroy(); 
    drawView.releaseResources(); 
    } 
} 

Mon fil Classe:

package com.miker.haminvaders; 

import android.graphics.Canvas; 
import android.util.Log; 
import android.view.SurfaceHolder; 


public class MainThread extends Thread 
{ 
    private boolean running; 
    SurfaceHolder surfaceHolder; 
    DrawView drawView; 
    public void setRunning(boolean r) 
    { 
     this.running = r; 
    } 
    @Override 
    public void run() 
    { 
     Canvas canvas = null; 
     while(running) 
     { 
      //Log.v("HAM", "tick!"); 
      try 
      { 
       canvas = surfaceHolder.lockCanvas(); 
       synchronized(surfaceHolder) 
       { 
        drawView.onDraw(canvas); 
        drawView.updatePositions(); 

       } 
      } 
      finally 
      { 
       if(canvas != null) 
        surfaceHolder.unlockCanvasAndPost(canvas); 
      } 
     } 
    } 
    public MainThread(SurfaceHolder surface, DrawView draw) 
    { 
     super(); 
     surfaceHolder = surface; 
     drawView = draw; 
    } 

} 

Ma classe SurfaceView:

package com.miker.haminvaders; 

import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.util.AttributeSet; 
import android.view.MotionEvent; 
import android.view.SurfaceHolder; 
import android.view.SurfaceView; 
import android.graphics.BitmapFactory; 
import android.util.Log; 


public class DrawView extends SurfaceView implements SurfaceHolder.Callback 
{ 
    private MainThread myThread; 

    private int screenWidth; 
    private int screenHeight; 

    private Paint textPaint; 
    private Paint backPaint; 

    private float x, y; 
    private Bitmap bmpHam; 


    public DrawView(Context context, AttributeSet attrs) 
    { 
     super(context, attrs); 

     SurfaceHolder holder = getHolder(); 
     holder.addCallback(this); 

     textPaint = new Paint(); 
     backPaint = new Paint(); 

     myThread = new MainThread(holder, this); 
     bmpHam = BitmapFactory.decodeResource(getResources(), R.drawable.lilhamstrich); 


    } 
    @Override 
    protected void onSizeChanged(int w, int h, int oldw, int oldh) 
    { 
     super.onSizeChanged(w, h, oldw, oldh); 
     screenWidth = w; 
     screenHeight = h; 

     textPaint.setTextSize(w/20); 
     backPaint.setColor(Color.WHITE); 

     newGame(); 
    } 
    public void newGame() 
    { 
     x = screenWidth/2; 
     y = screenHeight/2; 
    } 
    public void updatePositions() 
    { 
    } 
    public void onDraw(Canvas canvas) 
    { 
      canvas.drawColor(Color.WHITE); 
      canvas.drawBitmap(bmpHam, x, y, null); 
      Log.v("HAM", "Draw! " + x + " " + y); 
    } 
    public void stopGame() 
    { 
     if(myThread != null) 
      myThread.setRunning(false); 
    } 
    public void releaseResources() 
    { 
     //soundPool stuff 
    } 
    @Override 
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) 
    { 

    } 
    @Override 
    public void surfaceCreated(SurfaceHolder holder) 
    { 
     myThread.setRunning(true); 
     myThread.start(); 
    } 
    @Override 
    public void surfaceDestroyed(SurfaceHolder holder) 
    { 
     boolean retry = true; 
     myThread.setRunning(false); 
     while(retry) 
     { 
      try 
      { 
       myThread.join(); 
       retry = false; 
      } 
      catch(InterruptedException e) 
      { 

      } 
     } 
    } 
    @Override 
    public boolean onTouchEvent (MotionEvent event) 
    { 
    int action = event.getAction(); 
    if(action == MotionEvent.ACTION_DOWN) 
    { 

     x = event.getX(); 
     y = event.getY(); 
     Log.v("HAM","Down! " + x + " " + y); 
    } 
    return true; 
    } 

} 

Y at-il autre chose que je dois inclure?

Answer 1

Appelez invalidate() dans le onTouchEvent(), il devrait provoquer un redessin.