title: replacing one bitmap with second one canvas android
body: <p>i want to make an application in that there is two bitmap, i want to remove image whenever i touch my finger or move my finger and second bitmap's part be shown will be shown &amp; first image's part will be erased i have used following code but in that <strong>both images are replacing</strong> but i want to erase only first one, second will shown on erased area, ..can any body help me how to handle this</p>
  
  <p>below is the code</p>
  
  <pre><code>public class PaintView extends View implements OnTouchListener {
  private static final String TAG = "PaintView";
  Bitmap Bitmap1, Bitmap2;
  Bitmap Transparent;
  Bitmap overlay;
  int X = -100;
  int Y = -100;
  Canvas c2;
  
  // List&lt;Point&gt; points = new ArrayList&lt;Point&gt;();
  Paint paint = new Paint();
  
  public PaintView(Context context) {
      super(context);
      setFocusable(true);
      setFocusableInTouchMode(true);
      this.setOnTouchListener(this);
  
      Bitmap1 = BitmapFactory.decodeResource(getResources(), R.drawable.bear);
      Bitmap2 = BitmapFactory
              .decodeResource(getResources(), R.drawable.camel);
      Transparent = Bitmap.createBitmap(480, 800, Bitmap.Config.ARGB_8888);
      c2 = new Canvas();
      c2.setBitmap(Transparent);
      c2.drawBitmap(Bitmap1, 0, 0, null);
  
  
      paint.setAlpha(0);
      paint.setStyle(Style.FILL);
  
      paint.setXfermode(new PorterDuffXfermode(Mode.SRC_OUT));
      paint.setAntiAlias(true);
  
  }
  
  @Override
  public void onDraw(Canvas canvas) {
      c2.drawBitmap(Bitmap2, 0, 0, null);
      c2.drawCircle(X, Y, 50, paint);
      canvas.drawBitmap(Transparent, 0, 0, null);
  
  }
  
  public boolean onTouch(View view, MotionEvent event) {
      X = (int) event.getX();
      Y = (int) event.getY();
  
      invalidate();
      return true;
  }
   }
  
  class Point {
  float x, y;
  
  @Override
  public String toString() {
      return x + ", " + y;
  }
  }
  </code></pre>