Glide：获取位图以显示通知

Posted 2021-04-29

我试图运行下面的代码来获取封面图像，如果没有找到封面方法返回默认drawable（R.drawable.no_cover）。

private Bitmap getCoverImage(final Song song) {
    Bitmap bitmap;
    final Uri uri = ContentUris.withAppendedId(Utilities.sArtworkUri, song.getAlbumId());
        try {
            bitmap = Glide.with(service)
                .load(uri)
                .asBitmap()
                .into(256, 256)
                .get();
        } catch (InterruptedException | ExecutionException e) {
            bitmap = BitmapFactory.decodeResource(service.getResources(), R.drawable.no_cover);
        }
    return bitmap;
}

但是我收到错误（记录如下）。我应该为此创建新线程吗？

07-17 08:25:30.508 21095-21095/com.example.app E/androidRuntime: FATAL EXCEPTION: main
    Process: com.example.app, PID: 21098
    java.lang.IllegalArgumentException: YOu must call this method on a background thread
        at com.bumptech.glide.util.Util.assertBackgroundThread(Util.java:144)
        at com.bumptech.glide.request.RequestFutureTarget.doGet(RequestFutureTarget.java:169)
        at com.bumptech.glide.request.RequestFutureTarget.get(RequestFutureTarget.java:100)
        at com.example.app.notification.PlayerNotification$1.run(PlayerNotification.java:151)
        at android.os.Handler.handleCallback(Handler.java:751)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6682)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)

答案

因为您需要此Bitmap来显示通知，这意味着您必须首先获取位图，然后才能实际显示通知。

这是一个AsyncTask实现，可以帮助您：

public class TestActivity extends Activity {

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        new MyAsyncTask(getApplicationContext(), "some url").execute();
    }

    private static class MyAsyncTask extends AsyncTask<Void, Void, Bitmap> {

        private Context context;
        private String url;

        MyAsyncTask(Context context, String url) {
            this.context = context;
            this.url = url;
        }

        @Override
        protected Bitmap doInBackground(Void... params) {
            try {
                return Glide.with(context)
                        .load(url)
                        .asBitmap()
                        .into(256, 256)
                        .get();
            } catch (InterruptedException | ExecutionException e) {
                e.printStackTrace();
                return null;
            }
        }

        @Override
        protected void onPostExecute(Bitmap bitmap) {
            super.onPostExecute(bitmap);

            if (null != bitmap) {
                // show notification using bitmap
            } else {
                // couldn't fetch the bitmap
            }
        }
    }
}