[AndroidGraphic] Bitmap and Drawable

// drawable 轉換為 bitmap: 利用canvas物件來達成。
Bitmap drawableToBitmap(Drawable drawable) { 
    Bitmap.Config c = drawable.getOpacity() != PixelFormat.OPAQUE ? 
        Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565;
    Bitmap bitmap = Bitmap.createBitmap( 
        drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), c);
    Canvas canvas = new Canvas(bitmap); 
    drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), 
    drawable.getIntrinsicHeight()); 
    drawable.draw(canvas); 
    return bitmap;
}

Bitmap bitmap = ((BitmapDrawable) iconDrawable).getBitmap();
new BitmapDrawable(Bitmap.createScaledBitmap(bitmap, 128, 128, true))


// bitmap 轉換為 drawable: 利用BitmapDrawable直接轉換。
Drawable bitmapToDrawable(Bitmap bitmap) {
    Drawable drawable = new BitmapDrawable(bitmap);return drawable;
}

* Reference
- Camangi 市集 - 關發商資訊