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Asynctask wrapped in a retained fragment
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| import android.os.AsyncTask; | |
| import android.os.Bundle; | |
| import android.support.annotation.Nullable; | |
| import android.support.v4.app.Fragment; | |
| public abstract class RetainedAsyncTask<Params, Progress, Result> extends Fragment | |
| { | |
| private AsyncCustom asyncCustom; | |
| public RetainedAsyncTask() | |
| { | |
| asyncCustom = new AsyncCustom(); | |
| } | |
| @Override | |
| public void onCreate(@Nullable Bundle savedInstanceState) | |
| { | |
| super.onCreate(savedInstanceState); | |
| setRetainInstance(true); | |
| } | |
| @SuppressWarnings("unchecked") | |
| public void execute(Params... params) | |
| { | |
| if (asyncCustom.getStatus() == AsyncTask.Status.FINISHED) | |
| asyncCustom = new AsyncCustom(); | |
| asyncCustom.execute(params); | |
| } | |
| public void cancel(boolean mayInterrupt) | |
| { | |
| asyncCustom.cancel(mayInterrupt); | |
| } | |
| protected boolean isCancelled() | |
| { | |
| return asyncCustom.isCancelled(); | |
| } | |
| protected abstract void onPostExecute(Result result); | |
| protected abstract void onPreExecute(); | |
| @SuppressWarnings("unchecked") | |
| protected abstract void onProgressUpdate(Progress... values); | |
| protected abstract void onCancelled(); | |
| private final class AsyncCustom extends AsyncTask<Params, Progress, Result> | |
| { | |
| @SafeVarargs | |
| @Override | |
| protected final Result doInBackground(Params... paramses) | |
| { | |
| return RetainedAsyncTask.this.loadInBackground(paramses); | |
| } | |
| @Override | |
| protected void onPostExecute(Result result) | |
| { | |
| RetainedAsyncTask.this.onPostExecute(result); | |
| } | |
| @Override | |
| protected void onPreExecute() | |
| { | |
| RetainedAsyncTask.this.onPreExecute(); | |
| } | |
| @SafeVarargs | |
| @Override | |
| protected final void onProgressUpdate(Progress... values) | |
| { | |
| RetainedAsyncTask.this.onProgressUpdate(values); | |
| } | |
| @Override | |
| protected void onCancelled() | |
| { | |
| RetainedAsyncTask.this.onCancelled(); | |
| } | |
| } | |
| @SuppressWarnings("unchecked") | |
| protected abstract Result loadInBackground(Params... paramses); | |
| } |
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