android 扫描本地音乐文件

你可以使用Android自带的MediaStore类来扫描本地音乐文件。下面是一个简单的示例代码：

private void scanMusicFiles() {
    // 定义要查询的列
    String[] projection = new String[]{
            MediaStore.Audio.Media._ID,
            MediaStore.Audio.Media.DATA,
            MediaStore.Audio.Media.TITLE,
            MediaStore.Audio.Media.ARTIST,
            MediaStore.Audio.Media.ALBUM,
            MediaStore.Audio.Media.DURATION,
            MediaStore.Audio.Media.SIZE
    };

    // 定义查询条件，只查询音频文件
    String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0";

    // 查询音乐文件
    Cursor cursor = getContentResolver().query(
            MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
            projection,
            selection,
            null,
            null
    );

    // 遍历查询结果
    if (cursor != null) {
        while (cursor.moveToNext()) {
            // 获取音乐文件的信息
            long id = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media._ID));
            String path = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA));
            String title = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE));
            String artist = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST));
            String album = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM));
            long duration = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION));
            long size = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.SIZE));

            // 打印音乐文件的信息
            Log.d(TAG, "id: " + id);
            Log.d(TAG, "path: " + path);
            Log.d(TAG, "title: " + title);
            Log.d(TAG, "artist: " + artist);
            Log.d(TAG, "album: " + album);
            Log.d(TAG, "duration: " + duration);
            Log.d(TAG, "size: " + size);
        }
        cursor.close();
    }
}

注意：需要在AndroidManifest.xml文件中添加读取外部存储的权限：

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