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Android: Template for an AsyncTask (task to run in a background thread)

/ Published in: Java
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  1. public class MyThins {
  2.  
  3. 	private Object[] itemsToProcess;
  4. 	private OnProgressListener<FilesNeedDownloadingCheckerTask> onProgressListener;
  5. 	private OnFinishedListener<FilesNeedDownloadingCheckerTask, Result> onFinishedListener;
  6. 	private FilesNeedDownloadingCheckerTask task;
  7.  
  8. 	public void setOnProgressListener(OnProgressListener<FilesNeedDownloadingCheckerTask> onProgressListener) {
  9. 		this.onProgressListener = onProgressListener;
  10. 	}
  11.  
  12. 	public void setOnFinishedListener(OnFinishedListener<FilesNeedDownloadingCheckerTask, Result> onFinishedListener) {
  13. 		this.onFinishedListener = onFinishedListener;
  14. 	}
  15.  
  16. 	public FilesNeedDownloadingChecker(Object[] items) {
  17. 		super();
  18. 		this.itemsToProcess = items;
  19. 	}
  20.  
  21. 	public void cancel() {
  22. 		if (task != null) {
  23. 			task.cancel(true);
  24. 		}
  25. 	}
  26.  
  27. 	public void runAsync() {
  28. 		task = new MyThingTask();
  29. 		task.execute(null);
  30. 	}
  31.  
  32. 	public class Result {
  33. 		public ArrayList<Object> results = new ArrayList<Object>();
  34. 	}
  35.  
  36. 	public class MyThingTask extends AsyncTask<Object, Integer, Result> {
  37.                 Result result = new Result();
  38.  
  39. 		@Override
  40. 		protected Result doInBackground(Object... params) {
  41.                         // do things with this.itemsToProcess..
  42.                         if (isCancelled()) { return null);
  43.                         //	
  44.  
  45. 			return result;
  46. 		}
  47.  
  48. 		@Override
  49. 		protected void onProgressUpdate(Integer... values) {
  50. 			super.onProgressUpdate(values);
  51.  
  52. 			if (onProgressListener != null) {
  53. 				onProgressListener.onProgress(this, (double)values[0] / (double) remoteFiles.length );
  54. 			}
  55. 		}
  56.  
  57. 		@Override
  58. 		protected void onPostExecute(Result result) {
  59. 			super.onPostExecute(result);
  60.  
  61. 			if (onFinishedListener != null) {
  62. 				onFinishedListener.onFinished(this, result);
  63. 			}
  64. 		}
  65. 	}
  66. }

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