Frage zum Thema abstract AsyncTask

1public abstract class MyAsyncTask<A, B, C> extends AsyncTask<A, B, C> {
2
3 protected Context context;
4 protected MyProgressDialog dialog;
5 protected OnAsyncTaskCompletedListener listener;
6 protected int task_id;
7
8 public MyAsyncTask(int task_id, Context context, OnAsyncTaskCompletedListener listener) {
9 super();
10
11 this.context = context;
12 this.listener = listener;
13 this.task_id = task_id;
14 }
15
16 protected void attach(Context context, OnAsyncTaskCompletedListener listener) {
17 this.context = context;
18 this.listener = listener;
19
20 processCreateDialog();
21 }
22
23 protected void detach() {
24 processDismissDialog();
25
26 if (context != null) {
27 context = null;
28 }
29
30 if (listener != null) {
31 listener = null;
32 }
33 }
34
35 @Override
36 protected void onPostExecute(C result) {
37 if (listener != null) {
38 listener.onAsyncTaskCompleted(task_id, result);
39 }
40
41 detach();
42 }
43
44 @Override
45 protected void onPreExecute() {
46 processCreateDialog();
47 }
48
49 private void processCreateDialog() {
50 if (context != null) {
51 dialog = MyProgressDialog.show(context, null, null, true, false);
52 }
53 }
54
55 private void processDismissDialog() {
56 if (dialog != null) {
57 try {
58 dialog.dismiss();
59 } catch (Exception exception) {
60 }
61
62 dialog = null;
63 }
64 }
65}

1public class MyAsyncTaskImpl extends MyAsyncTask<Void, Void, Cursor> {
2 // --> Fehler: MyAsyncTask cannot be resolved to a type - Create class 'MyAsyncTask<T1, T2, T3>'
3
4 private String search;
5
6 public MyAsyncTaskImpl(int task_id, Context context, OnAsyncTaskCompletedListener listener, String search) {
7 super(task_id, context, listener);
8
9 this.search = search;
10 }
11
12 @Override
13 protected Cursor doInBackground(final Void... voids) {
14 // --> Fehler: The method doInBackground(Void...) of type MyAsyncTaskImpl must override or implement a supertype method - Remove '@Override' annotation
15 return MyApplication.getSqliteOpenHelper().fetchSomething(search);
16 }
17}