ContextUtils.java 文件源码

public Bitmap getBitmapFromDrawable(int drawableId) {
    Bitmap bitmap = null;
    Drawable drawable = ContextCompat.getDrawable(_context, drawableId);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && (drawable instanceof VectorDrawable || drawable instanceof VectorDrawableCompat)) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            drawable = (DrawableCompat.wrap(drawable)).mutate();
        }

        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);
    } else if (drawable instanceof BitmapDrawable) {
        bitmap = ((BitmapDrawable) drawable).getBitmap();
    }
    return bitmap;
}