Restaurer l'état actif après y être retourné

Question

Mon ListView consiste en quelques musiques à côté desquelles il y a une icône à côté de chaque élément, si la musique existe sur la carte SD, l'icône est icône de lecture sinon c'est l'icône de téléchargement. Lorsque je clique sur l'icône de téléchargement, il commence à télécharger avec un ProgressBar mais si j'appuie sur le bouton de retour pendant le téléchargement puis de nouveau sur l'activité, la barre de progression disparaît et l'icône de lecture apparaît.

Comment puis-je me mettre à jour à partir des dernières modifications lorsque je reviens à l'activité?

ActivityMusic:

ActivityMusic.myFileDownloadTask task = new ActivityMusic.myFileDownloadTask(info, mAdapter, myList); 
task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR); 

Mon adaptateur:

ActivityMusic.myFileDownloadTask task = new ActivityMusic.myFileDownloadTask(info, mAdapter, myList); 
task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR); 

myfileDownloadTask:

public static class myFileDownloadTask extends AsyncTask<String, Integer, String> { 
    //  private static final String TAG = FileDownloadTask.class.getSimpleName(); 
    final DownloadInfo mInfo; 
    public List<DownloadInfo> myList; 
    private String url = ""; 

    //  public DownloadInfoArrayAdapter downloadInfoArrayAdapter; 

    public myFileDownloadTask(DownloadInfo info, DownloadInfoArrayAdapter mAdapter, List<DownloadInfo> updateList) { 
     mInfo = info; 
     info.setDownloading(true); 
     mInfo.setDownloading(true); 

     mInfo.setDownloadState(DownloadInfo.DownloadState.DOWNLOADING); 
     //   downloadInfoArrayAdapter = mAdapter; 
     myList = updateList; 

    } 

    // 
    @Override 
    protected void onProgressUpdate(Integer... values) { 
     mInfo.setProgress(values[0]); 
     ProgressBar bar = mInfo.getProgressBar(); 
     if (bar != null) { 
      ActivityMusic.loading.setVisibility(View.INVISIBLE); 
      bar.setProgress(mInfo.getProgress()); 
      bar.invalidate(); 
     } 
    } 

    @Override 
    protected void onPostExecute(String result) { 
     mInfo.setDownloadState(DownloadInfo.DownloadState.COMPLETE); 
     ProgressBar progressBar = mInfo.getProgressBar(); 
     progressBar.setVisibility(View.INVISIBLE); 
     mInfo.setDownloading(false); 
     ImageView img = mInfo.getDImageView(); 
     img.setImageResource(R.drawable.download); 
     mInfo.setDImaegView(img); 
     mInfo.getDImageView().setVisibility(View.INVISIBLE); 

     mInfo.setProgressBar(progressBar); 
     ImageView img2 = mInfo.getImageView(); 
     img2.setImageResource(R.drawable.play); 
     mInfo.setPImaegView(img2); 
     mInfo.getImageView().setEnabled(true); 
     mInfo.getImageView().setVisibility(View.VISIBLE); 

     mInfo.getImageView().setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       //     Toast.makeText(ActivityMusic.mcontext, "Ari", Toast.LENGTH_SHORT).show(); 
       File mfolder = new File(Environment.getExternalStorageDirectory() + "/Sh_M/" + mInfo.getFilename() + ".mp3"); 
       DownloadInfoArrayAdapter.mUri = Uri.fromFile(mfolder); 
       ActivityMusic.audioWife.getInstance().release(); 
       ActivityMusic.audioWife 
         .init(null, DownloadInfoArrayAdapter.mUri) 
         .setPlayView(ActivityMusic.mPlayMedia) 
         .setPauseView(ActivityMusic.mPauseMedia) 
         .setSeekBar(ActivityMusic.mMediaSeekBar) 
         .setRuntimeView(ActivityMusic.mRunTime) 
         .setTotalTimeView(ActivityMusic.mTotalTime).play(); 
       ActivityMusic.relativeLayout.setVisibility(View.VISIBLE); 
       ActivityMusic.isPlaying = true; 
      } 
     }); 
     //   downloadInfo.add(new DownloadInfo("", 1000, "")); 
     //   myList.add(ActivityMusic.downloadInfo.get(0)); 
     //   downloadInfoArrayAdapter = new DownloadInfoArrayAdapter(mcontext,R.id.list_view,downloadInfo); 
     //   listView.setAdapter(downloadInfoArrayAdapter); 
     downloadInfoArrayAdapter.notifyDataSetChanged(); 
     //   ActivityMusic.downloadInfoArrayAdapter.notifyDataSetChanged(); 

    } 

    @Override 
    protected void onPreExecute() { 
     mInfo.setDownloadState(DownloadInfo.DownloadState.DOWNLOADING); 
     mInfo.setDownloading(true); 
    } 


    @Override 
    protected String doInBackground(String... f_url) { 
     //   mInfo.setDownloadState(DownloadInfo.DownloadState.DOWNLOADING); 
     int count; 
     try { 
      URL url = new URL(mInfo.getLink()); 
      URLConnection conection = url.openConnection(); 
      conection.connect(); 
      // getting file length 
      int lenghtOfFile = conection.getContentLength(); 

      // input stream to read file - with 8k buffer 
      InputStream input = new BufferedInputStream(url.openStream(), 8192); 

      File folder = new File(Environment.getExternalStorageDirectory() + "/Sh_M"); 
      if (!folder.exists()) { 
       folder.mkdir(); 
      } 
      // Output stream to write file 
      OutputStream output = new FileOutputStream("/sdcard/Sh_M/" + mInfo.getFilename() + ".mp3"); 

      byte data[] = new byte[1024]; 

      long total = 0; 

      while ((count = input.read(data)) != -1) { 
       total += count; 
       // publishing the progress.... 
       // After this onProgressUpdate will be called 
       publishProgress((int) ((total * 1000)/lenghtOfFile)); 

       // writing data to file 
       output.write(data, 0, count); 
      } 

      // flushing output 
      output.flush(); 


      // closing streams 
      output.close(); 
      input.close(); 

     } catch (Exception e) { 
      Log.e("Error: ", ""); 
     } 
     return null; 
    } 

} 

Answer 1

Lorsque vous jouez avec des activités, essayez d'enregistrer l'état et la restauration de retour lorsque l'activité reprend. Vérifiez https://stackoverflow.com/a/151940/1403009 pour plus d'informations