Decoding bitmap from Drawable Resource Id is giving null

Question

我想从可绘制资源ID中获取Bitmap，我找到了一种使用BitmapFactory解码方法对其进行解码的解决方案，但它给出了null。

Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_tick);

Answer 1

Please check if you are using Vector drawable or normal png/jpeg image as a drawable, it gives null value if you try to decode vector drawable.

Use this code if you are trying to decode Vector drawable

public static Bitmap getBitmapFromVectorDrawable(Context context, int drawableId) {
Drawable drawable = ContextCompat.getDrawable(context, drawableId);
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
    drawable = (DrawableCompat.wrap(drawable)).mutate();
}

Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),
        drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);

return bitmap;
}

Also make sure if you have vector support enable in your app gradle

vectorDrawables.useSupportLibrary = true