Java Android emulator找不到音乐播放器应用程序的音频文件

我正在开发一个简单的音乐播放器应用程序，并查询内容解析程序，如下所示：

        ContentResolver contentResolver = getContentResolver();

        Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
        String selection = MediaStore.Audio.Media.IS_MUSIC + "!= 0";
        String sortOrder = MediaStore.Audio.Media.TITLE + " ASC";
        Cursor cursor = contentResolver.query(uri, null, selection, null, sortOrder);

        audioList = new ArrayList<>();
        Log.d("CURSOR IS NULL", (cursor != null) ? "FALSE": "TRUE");
        Log.d("CURSOR COUNT", String.valueOf(cursor.getCount()));
        if (cursor != null && cursor.getCount() > 0) {
            while (cursor.moveToNext()) {
                String data = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA));
                String title = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE));
                String album = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM));
                String artist = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST));

                // Save to audioList
                audioList.add(new Audio(data, title, album, artist));
                Log.d("DEBUG TITLE", title);
            }
        }
        cursor.close();

哪个报道

Broadcasting: Intent { act=android.intent.action.MEDIA_SCANNER_SCAN_FILE dat=/mnt/sdcard/Music/bensound-betterdays.mp3 flg=0x400000 }
Broadcast completed: result=0
Broadcasting: Intent { act=android.intent.action.MEDIA_SCANNER_SCAN_FILE dat=/mnt/sdcard/Music/bensound-dubstep.mp3 flg=0x400000 }
Broadcast completed: result=0
Broadcasting: Intent { act=android.intent.action.MEDIA_SCANNER_SCAN_FILE dat=/mnt/sdcard/Music/bensound-epic.mp3 flg=0x400000 }
Broadcast completed: result=0
Broadcasting: Intent { act=android.intent.action.MEDIA_SCANNER_SCAN_FILE dat=/mnt/sdcard/Music/bensound-funnysong.mp3 flg=0x400000 }
Broadcast completed: result=0
Broadcasting: Intent { act=android.intent.action.MEDIA_SCANNER_SCAN_FILE dat=/mnt/sdcard/Music/bensound-sunny.mp3 flg=0x400000 }
Broadcast completed: result=0

我可以从文件应用程序或Youtube音乐中自由播放这些音乐文件，但我的应用程序无论如何都找不到它们。有人能告诉我我遗漏了什么吗？我是Android开发新手

---

非常感谢

尝试将其添加到应用程序标记中的AndroidManifest.xml文件中

<application
.....
  android:requestLegacyExternalStorage="true"
....

---

谢谢你的建议！不幸的是，这并没有改变任何事情，冷启动再次太
Broadcasting: Intent { act=android.intent.action.MEDIA_SCANNER_SCAN_FILE dat=/mnt/sdcard/Music/bensound-betterdays.mp3 flg=0x400000 }
Broadcast completed: result=0
Broadcasting: Intent { act=android.intent.action.MEDIA_SCANNER_SCAN_FILE dat=/mnt/sdcard/Music/bensound-dubstep.mp3 flg=0x400000 }
Broadcast completed: result=0
Broadcasting: Intent { act=android.intent.action.MEDIA_SCANNER_SCAN_FILE dat=/mnt/sdcard/Music/bensound-epic.mp3 flg=0x400000 }
Broadcast completed: result=0
Broadcasting: Intent { act=android.intent.action.MEDIA_SCANNER_SCAN_FILE dat=/mnt/sdcard/Music/bensound-funnysong.mp3 flg=0x400000 }
Broadcast completed: result=0
Broadcasting: Intent { act=android.intent.action.MEDIA_SCANNER_SCAN_FILE dat=/mnt/sdcard/Music/bensound-sunny.mp3 flg=0x400000 }
Broadcast completed: result=0

<application
.....
  android:requestLegacyExternalStorage="true"
....