从设备的特定文件夹中获取 AudioMP3 文件或获取所有文件

首先，将以下权限添加到项目清单中，以启用设备存储访问：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

然后，创建文件 AudioModel.class 并将以下模型类放入其中，以便获取和设置列表项：

public class AudioModel {
    String aPath;
    String aName;
    String aAlbum;
    String aArtist;

    public String getaPath() {
        return aPath;
    }
    public void setaPath(String aPath) {
        this.aPath = aPath;
    }
    public String getaName() {
        return aName;
    }
    public void setaName(String aName) {
        this.aName = aName;
    }
    public String getaAlbum() {
        return aAlbum;
    }
    public void setaAlbum(String aAlbum) {
        this.aAlbum = aAlbum;
    }
    public String getaArtist() {
        return aArtist;
    }
    public void setaArtist(String aArtist) {
        this.aArtist = aArtist;
    }
}

接下来，使用以下方法从设备的文件夹中读取所有 MP3 文件或读取设备的所有文件：

public List<AudioModel> getAllAudioFromDevice(final Context context) {
    final List<AudioModel> tempAudioList = new ArrayList<>();

    Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
    String[] projection = {MediaStore.Audio.AudioColumns.DATA, MediaStore.Audio.AudioColumns.TITLE, MediaStore.Audio.AudioColumns.ALBUM, MediaStore.Audio.ArtistColumns.ARTIST,};
    Cursor c = context.getContentResolver().query(uri, projection, MediaStore.Audio.Media.DATA + " like ? ", new String[]{"%utm%"}, null);

    if (c != null) {
        while (c.moveToNext()) {
            AudioModel audioModel = new AudioModel();
            String path = c.getString(0);
            String name = c.getString(1);
            String album = c.getString(2);
            String artist = c.getString(3);

            audioModel.setaName(name);
            audioModel.setaAlbum(album);
            audioModel.setaArtist(artist);
            audioModel.setaPath(path);

            Log.e("Name :" + name, " Album :" + album);
            Log.e("Path :" + path, " Artist :" + artist);

            tempAudioList.add(audioModel);
        }
        c.close();
    }

    return tempAudioList;
}

上面的代码将返回包含音乐名称，路径，艺术家和专辑的所有 MP3 文件的列表。有关更多详细信息，请参阅 Media.Store.Audio 文档。

要读取特定文件夹的文件，请使用以下查询（你需要替换文件夹名称）：

Cursor c = context.getContentResolver().query(uri,
    projection,
    MediaStore.Audio.Media.DATA + " like ? ",
    new String[]{"%yourFolderName%"}, // Put your device folder / file location here.
    null);

如果要从设备中检索所有文件，请使用以下查询：

Cursor c = context.getContentResolver().query(uri,
    projection,
    null,
    null,
    null);

注意：不要忘记启用存储访问权限。

现在，你所要做的就是调用上面的方法来获取 MP3 文件：

getAllAudioFromDevice(this);

活动示例

public class ReadAudioFilesActivity extends AppCompatActivity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_audio_list);

        /**
         * This will return a list of all MP3 files. Use the list to display data.
         */
        getAllAudioFromDevice(this);
    }

    // Method to read all the audio/MP3 files.
    public List<AudioModel> getAllAudioFromDevice(final Context context) {
        final List<AudioModel> tempAudioList = new ArrayList<>();

        Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
        String[] projection = {MediaStore.Audio.AudioColumns.DATA,MediaStore.Audio.AudioColumns.TITLE ,MediaStore.Audio.AudioColumns.ALBUM, MediaStore.Audio.ArtistColumns.ARTIST,};
        Cursor c = context.getContentResolver().query(uri, projection, MediaStore.Audio.Media.DATA + " like ? ", new String[]{"%utm%"}, null);

        if (c != null) {
            while (c.moveToNext()) {
                // Create a model object.
                AudioModel audioModel = new AudioModel();
                
                String path = c.getString(0);   // Retrieve path.
                String name = c.getString(1);   // Retrieve name.
                String album = c.getString(2);  // Retrieve album name.
                String artist = c.getString(3); // Retrieve artist name.

                // Set data to the model object.
                audioModel.setaName(name);
                audioModel.setaAlbum(album);
                audioModel.setaArtist(artist);
                audioModel.setaPath(path);

                Log.e("Name :" + name, " Album :" + album);
                Log.e("Path :" + path, " Artist :" + artist);

                // Add the model object to the list .
                tempAudioList.add(audioModel);
            }
            c.close();
        }

        // Return the list.
        return tempAudioList;
    }
}