Loader

MainActivity.java

public class MainActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks {
	private int LOADER_ID = 1;
	//...

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		//...
		
		if (getLoaderManager().getLoader(LOADER_ID) == null) {
			getLoaderManager().initLoader(LOADER_ID, null, this).forceLoad();
		}
		else 
			getLoaderManager().initLoader(LOADER_ID, null, this);
		}
	}

	@Override
	public Loader onCreateLoader(int i, Bundle bundle) 
		return new ExampleTaskLoader(this);
	}

	@Override
	public void onLoadFinished(Loader loader, Object o) 
		mTextView.setText((String) o);
	}

	@Override
	public void onLoaderReset(Loader loader) 
		loader.reset();
	}
}