找到所有的MP3文件存儲在Android

我試圖找到所有的MP3文件，但一個也不知道，我發現這個代碼，唯一的問題是getActivity（）沒有宣佈，我不知道如何修復，請幫助我。如果有更好的方法來做到這一點，我接受消化。找到所有的MP3文件存儲在Android

這裏是我的類：

public class SongsManager { 
    private ArrayList<Song> songsList; 
    public void getMp3Songs() { 
     Uri allSongsUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; 
     String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0"; 
     Cursor cursor = getActivity().getContentResolver().query(allSongsUri, null, null, null, selection); 
     if (cursor != null) { 
      if (cursor.moveToFirst()) { 
       do { 
        Song song = new Song(cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.Media._ID)), 
             cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME)), 
             cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST)), 
             cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA))); 
        songsList.add(song); 
//     album_name = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM)); 
//     int album_id = cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID)); 
//     int artist_id = cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST_ID)); 
       } while (cursor.moveToNext()); 
      } 
      cursor.close(); 
     } 
    } 
}

來源

2017-03-05 Felipe Custódio

爲方法（getMp3Songs）設定的參數作爲上下文：

public class SongsManager { 
private ArrayList<Song> songsList; 
public void getMp3Songs(Context ctx) { 
    Uri allSongsUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; 
    String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0"; 
    Cursor cursor = ctx.getContentResolver().query(allSongsUri, null, null, null, selection); 
    if (cursor != null) { 
     if (cursor.moveToFirst()) { 
      do { 
       Song song = new Song(cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.Media._ID)), 
            cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME)), 
            cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST)), 
            cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA))); 
       songsList.add(song); 
//     album_name = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM)); 
//     int album_id = cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID)); 
//     int artist_id = cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST_ID)); 
      } while (cursor.moveToNext()); 
     } 
     cursor.close(); 
    } 
}

}

來源

2017-03-05 21:10:27 amin

創建構造函數，並把那裏語境。然後調用上下文而不是getActivity（）;

public class SongsManager { 

private Context context; 

public SongsManager(Context context){ 
this.context = context; 
} 
}

來源

2017-03-05 21:09:36 Bro

找到所有的MP3文件存儲在Android

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