Fixes #2

Fixes #2

Image shaders are refreshed when the image itself changes. This helps
change images on runtime without taking a bit hit on performance.

CircularImageView/src/com/pkmmte/circularimageview/CircularImageView.java

@@ -254,17 +254,23 @@ public boolean dispatchTouchEvent(MotionEvent event)
  public void invalidate(Rect dirty) {
  super.invalidate(dirty);
  image = drawableToBitmap(getDrawable());
+ if(shader != null || canvasSize > 0)
+ refreshBitmapShader();
  }
 
  public void invalidate(int l, int t, int r, int b) {
  super.invalidate(l, t, r, b);
  image = drawableToBitmap(getDrawable());
+ if(shader != null || canvasSize > 0)
+ refreshBitmapShader();
  }
 
  @Override
  public void invalidate() {
  super.invalidate();
  image = drawableToBitmap(getDrawable());
+ if(shader != null || canvasSize > 0)
+ refreshBitmapShader();
  }
 
  @Override
@@ -350,6 +356,10 @@ public void refreshBitmapShader()
  shader = new BitmapShader(Bitmap.createScaledBitmap(image, canvasSize, canvasSize, false), Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
  }
 
+ /**
+ * Returns whether or not this view is currently 
+ * in its selected state.
+ */
  public boolean isSelected()
  {
  return this.isSelected;