我有一个包含多个项目的listview，当我单击一个项目时，进度条应该开始递增，递增的数据来自intentservice，被resultreceiver截取，并且从结果接收器我需要更新进度条。
问题是我不知道怎么做。我试着在adapterlist类中直接升级，但没有成功。据我所知，异步任务需要在后台运行才能正常工作，但我不知道异步任务是如何获得正确的视图来递增的，或者它是如何递增的。
这是我的主要活动：

public class MainActivity extends AppCompatActivity {

    ArrayList<PlaylistItem> arrayOfUsers = new ArrayList<PlaylistItem>();
    PlaylistAdapter adapter;
     ListView listView ;
     String name;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Create the adapter to convert the array to views
        // Attach the adapter to a ListView

        Intent downloadIntent = new Intent(this, DownloadService.class);
        downloadIntent.putExtra("url", "http://10.0.2.2:8080/downloadPlaylist" );
        downloadIntent.putExtra("type","playlist");
        downloadIntent.putExtra("receiver", new DownloadReceiver(new Handler()));
        startService(downloadIntent);

        Intent intentExtras = getIntent();
        String editJobID = intentExtras.getStringExtra("name");
        name=intentExtras.getStringExtra("name");
        if(editJobID!=null)
        {
            if (!checkPermission()) {
                romaneasca(1,editJobID);
            } else {
                if (checkPermission()) {
                    requestPermissionAndContinue(editJobID);
                } else {
                    romaneasca(1,editJobID);
                }
            }

        }

    }
   public class DownloadReceiver extends ResultReceiver {
        public DownloadReceiver(Handler handler) {
            super(handler);
        }
        @Override
        protected void onReceiveResult(int resultCode, Bundle resultData) {
            super.onReceiveResult(resultCode, resultData);
            if (resultCode == UPDATE_PROGRESS) {
                // vom updata progressbar-ul
                Toast.makeText(MainActivity.this, "update progress",Toast.LENGTH_SHORT);
                int res= (int) resultData.get("progress");
                int pos= (int) resultData.get("position");
               // adapter.progressBar.setProgress(res);
                adapter.setProgress(res);

            }
        }
    }

这是我的listview适配器

public class PlaylistAdapter extends ArrayAdapter<PlaylistItem> {
    Context context;
    ProgressBar progressBar;
    public PlaylistAdapter(Context context, ArrayList<PlaylistItem> playlist) {
        super(context, 0, playlist);
        this.context = context;

    }
    View convertView2;
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        convertView2=convertView;
        // Get the data item for this position
        PlaylistItem user = getItem(position);
        // Check if an existing view is being reused, otherwise inflate the view
        if (convertView == null) {
            convertView = LayoutInflater.from(getContext()).inflate(R.layout.item_music, parent, false);
        }
        // Lookup view for data population
        TextView title = (TextView) convertView.findViewById(R.id.Title);
        ImageButton downloaded = (ImageButton) convertView.findViewById(R.id.Download);
         progressBar = (ProgressBar) convertView.findViewById(R.id.simpleProgressBar);
        // Populate the data into the template view using the data object
        title.setText(user.musicName);
        if (user.downloaded)
        {
            downloaded.invalidate();
        }
        final int positionForListener = position;
        final PlaylistItem play = user;

        downloaded.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(getContext(),Integer.toString(positionForListener) + "position clicked", Toast.LENGTH_SHORT).show();
                Intent intentEditJob = new Intent(context,MainActivity.class);
                intentEditJob.putExtra("name", play.musicName);
                ProgressBar  progressBar2=new ProgressBar(view.getContext());
                progressBar2.setProgress(10);
                context.startService(intentEditJob);
                int incr=10;
            }
        });
        return convertView;
    }

    public void setProgress(int progress)
    {
        progressBar = new ProgressBar(getContext());
        progressBar.setProgress(progress);
    }

downloadservice是执行工作并返回增量的服务。我不知道在哪里安装异步任务来升级进度条。到目前为止，代码没有崩溃，但也没有任何作用。如果有人对该怎么做有想法或建议？谢谢您！