在Android O预览中将AdaptiveIconDrawable转换为Bitmap

Question

通过昨天的新预览版,我开始将我的应用更新到此版本.我的应用程序的一部分是列出已安装的应用程序及相关图标.

Drawable drawable = mPackageManager.getApplicationIcon(packageName);

应用程序的这一部分仍然有效.时钟,计算器或消息等应用程序已经支持新版本的图标,因此它们会返回一个AdaptiveIconDrawable.

Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();

这部分不再起作用了.有没有其他方法可以转换AdaptiveIconDrawable为Bitmap？提前致谢.

Answer 1

这是更普遍的解决方案:

@NonNull
private Bitmap getBitmapFromDrawable(@NonNull Drawable drawable) {
    final Bitmap bmp = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
    final Canvas canvas = new Canvas(bmp);
    drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
    drawable.draw(canvas);
    return bmp;
}

如果您不想使用自己的,它还将在系统定义的形状中渲染背景.

您可以在任何Drawable上使用它,也可以在VectorDrawable中使用它.它也适用于BitmapDrawable,只需getBitmap()就可以提高内存效率.

Answer 2

我们可以通过以下方式实现，

AppIconHelper.java

public class AppIconHelper {

    public static Bitmap getAppIcon(PackageManager mPackageManager, String packageName) {

        if (Build.VERSION.SDK_INT >= 26) {
            return AppIconHelperV26.getAppIcon(mPackageManager, packageName);
        }

        try {
            Drawable drawable = mPackageManager.getApplicationIcon(packageName);

            return ((BitmapDrawable) drawable).getBitmap();
        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;
    }
}

对于支持 Android O(>=26) 的设备，我们可以调用 AppIconHelperV26 类来获取 AppIcon，在此，如果它的 drawable 是 AdaptiveIconDrawable，我们将执行以下步骤 1. 获取 Foreground 和 Background drawable 并创建为 Layer Drawable 2。使用 Canvas 我们可以将 Layer drawable 转换为 Bitmap

AppIconHelperV26.java

public class AppIconHelperV26 {

    @RequiresApi(api = Build.VERSION_CODES.O)
    public static Bitmap getAppIcon(PackageManager mPackageManager, String packageName) {

        try {
            Drawable drawable = mPackageManager.getApplicationIcon(packageName);

            if (drawable instanceof BitmapDrawable) {
                return ((BitmapDrawable) drawable).getBitmap();
            } else if (drawable instanceof AdaptiveIconDrawable) {
                Drawable backgroundDr = ((AdaptiveIconDrawable) drawable).getBackground();
                Drawable foregroundDr = ((AdaptiveIconDrawable) drawable).getForeground();

                Drawable[] drr = new Drawable[2];
                drr[0] = backgroundDr;
                drr[1] = foregroundDr;

                LayerDrawable layerDrawable = new LayerDrawable(drr);

                int width = layerDrawable.getIntrinsicWidth();
                int height = layerDrawable.getIntrinsicHeight();

                Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

                Canvas canvas = new Canvas(bitmap);

                layerDrawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
                layerDrawable.draw(canvas);

                return bitmap;
            }
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }

        return null;
    }
}

现在你可以调用 AppIconHelper.getAppIcon 来获取 Bitmap，

应用列表适配器.java

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
    //... your code here
    Bitmap appIcon = AppIconHelper.getAppIcon(packageManager, packageName);
    imageView.setImageBitmap(appIcon);

}