android之將圖片轉化為圓形圖片

bitmap = ((BitmapDrawable)imageView1.getDrawable()).getBitmap(); 
bitmap = getRoundedCornerBitmap(bitmap); 
imageView1.setImageBitmap(bitmap); 

public static Bitmap getRoundedCornerBitmap(Bitmap bitmap) { 
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), 
bitmap.getHeight(), Config.ARGB_8888); 
Canvas canvas = new Canvas(output); 

final int color = 0xff424242; 
final Paint paint = new Paint(); 
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); 
final RectF rectF = new RectF(rect); 
final float roundPx = bitmap.getWidth() / 2; 

paint.setAntiAlias(true); 
canvas.drawARGB(0, 0, 0, 0); 
paint.setColor(color); 
canvas.drawRoundRect(rectF, roundPx, roundPx, paint); 

paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); 
canvas.drawBitmap(bitmap, rect, rect, paint); 
return output; 
}