相关疑难解决方法(0)

我正在为Android开发一个mp3播放器应用程序,我收到与用户权限相关的错误(READ_EXTERNAL_STORAGE)

这是我要求权限的代码:

int permissionCheck = ContextCompat.checkSelfPermission(PlayListActivity.this,
                Manifest.permission.READ_EXTERNAL_STORAGE);

        if (ContextCompat.checkSelfPermission(PlayListActivity.this,
                Manifest.permission.READ_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED) {


            // OPCIONAL(explicaciones de poque pedimos los permisos)
            if (ActivityCompat.shouldShowRequestPermissionRationale(PlayListActivity.this,
                    Manifest.permission.READ_EXTERNAL_STORAGE)) {

            } else {
                //pedir permisos
                ActivityCompat.requestPermissions(PlayListActivity.this,
                        new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                        permissionCheck);

这是代码的其余部分:

ArrayList<HashMap<String, String>> songsListData = new ArrayList<HashMap<String, String>>();

    SongsManager plm = new SongsManager(PlayListActivity.this);
    // get all songs from sdcard
    this.songsList = plm.getPlayList();

    // looping through playlist
    for (int i = 0; i < songsList.size(); i++) {
        // creating new HashMap
        HashMap<String, String> song = songsList.get(i);

        // adding …