我正在使用Download Manger下載一些多媒體文件并對其進行分類.我也在使用Crashlytics,這是一個錯誤,我經(jīng)常在不同的設備和Android版本上得到它.我正在尋找你的解決方案/建議！

java.lang.IllegalArgumentException: Unknown URL content://downloads/my_downloads

at android.content.ContentResolver.insert(ContentResolver.java:862)

at android.app.DownloadManager.enqueue(DownloadManager.java:1252)

at com.myapp.LessonFragment$DownloadClickListener.onClick(SourceFile:570)

at android.view.View.performClick(View.java:4262)

at android.view.View$PerformClick.run(View.java:17351)

at android.os.Handler.handleCallback(Handler.java:615)

at android.os.Handler.dispatchMessage(Handler.java:92)

at android.os.Looper.loop(Looper.java:137)

at android.app.ActivityThread.main(ActivityThread.java:4921)

at java.lang.reflect.Method.invokeNative(Method.java)

at java.lang.reflect.Method.invoke(Method.java:511)

at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)

at dalvik.system.NativeStart.main(NativeStart.java)

您可以在下面看到我的代碼：

private class DownloadClickListener implements View.OnClickListener {

@Override

public void onClick(View view) {

// Check if download manager available before request

if (!DownloadHelper.isDownloadManagerAvailable(getActivity())) {

// Build custom alert dialog

AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

builder.setMessage(R.string.download_manager_disabled);

builder.setCancelable(false);

builder.setPositiveButton(R.string.ok, (dialog, which) -> {

dialog.dismiss();

});

// Create and display alert dialog

AlertDialog dialog = builder.create();

dialog.show();

return;

}

// Display short toast on download clicked

Toast.makeText(getActivity(), R.string.lesson_download_start, Toast.LENGTH_SHORT).show();

// Get attach from view tag

Attache attache = (Attache) view.getTag();

// Get lesson using lesson id

Lesson lesson = new Select().from(Lesson.class)

.where(Condition.column("id").is(attache.getLessonId()))

.querySingle();

// Set file name from url and attache name

Uri uri = Uri.parse(attache.getFile());

String fileName = attache.getName() + '.'

+ MimeTypeMap.getFileExtensionFromUrl(attache.getFile());

// Check if path directory not exist and create it

String filePath = Environment.getExternalStorageDirectory() + "/myapp/" + lesson.getTitle() + "/";

File path = new File(filePath);

if (!path.exists() || !path.isDirectory()) {

if (!path.mkdirs()) {

Timber.e("Could not create path directory.");

}

}

// Check if file exist and then delete it

File file = new File(filePath, fileName);

if (file.exists() && file.isFile()) {

if (file.delete()) {

Timber.v("%s just deleted.", fileName);

}

}

// Create download manager request using url

DownloadManager.Request request = new DownloadManager.Request(uri);

request.setTitle(attache.getName());

request.setDestinationInExternalPublicDir("/myapp/" + lesson.getTitle(), fileName);

// Using DownloadManager for download attache file

DownloadManager manager = (DownloadManager) getActivity().getSystemService(Context.DOWNLOAD_SERVICE);

manager.enqueue(request);

}

}

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