I am using AsyncTask as an inner class with the following signature as below:
public abstract class BaseFragmentActivity extends FragmentActivity {
static final int PROGRESS_DIALOG = 0;
Dialog progessDialog;
public abstract void displayData(T output);
@Override
protected Dialog onCreateDialog(int id) {
if (id == PROGRESS_DIALOG) {
ProgressDialog progressDialog = ProgressDialog.show(this, "",
"Loading. Please wait...", true);
progessDialog = progressDialog;
}
return progessDialog;
}
class PerformOPTask<T> extends AsyncTask<Void, String, T> {
// connector=new JSONConnector();
Connector connector;
String curUrl;
Class<T> clazz;
PerformOPTask(String url, Class<T> curClazz) {
//connector = new UnitTestConnector();
connector = new JSONConnector();
curUrl = url;
clazz = curClazz;
}
@Override
protected T doInBackground(Void... params) {
return connector.getData(URLUtils.getFormattedUrl(curUrl),clazz);
}
@Override
protected void onPostExecute(T output) {
displayData(output);
}
}
}
public abstract class BaseListFragmentActivity extends BaseFragmentActivity implements OnItemClickListener, OnClickListener{
protected ListView mList;
/** Called when the activity is first created. */
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.table_list);
CommonUtil.getActionBarWithBackButton(this,getLayoutInflater());
mList=(ListView)findViewById(R.id.table_list_listView);
mList.setOnItemClickListener(this);
}
public void onBackABButtonPressed(View view) {
finish();
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
@Override
public abstract void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3);
}
public class ListAccountsActivity extends BaseListFragmentActivity {
protected Acct[] mItems;
private String[] mIcons;
protected boolean displayHandledBySubClass=false;
/** Called when the activity is first created. */
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
// Create an array of Strings, that will be put to our ListActivity
// Log.i("MY INFO",this.runJSONParser().getAcct().toString());
AccountData actData = new AccountData();
//actData=(AccountData)
new PerformOPTask<AccountData>(getString(R.string.get_account),AccountData.class).execute();
showDialog(PROGRESS_DIALOG);
//.getData(URLUtils.getFormattedUrl(getString(R.string.get_account)),actData);
}
@Override
public void onItemClick(AdapterView<?> lv, View view, int position, long id) {
// super.onListItemClick(l, v, position, id);
// Get the item that was clicked
Acct account = (Acct) mList.getAdapter().getItem(position);
Intent intent=new Intent(this,AccountDetailViewActivity.class);
intent.putExtra("selectedAccount",account);
startActivity(intent);
}
@Override
**public void displayData(ServerOutput output){** //error here
if(displayHandledBySubClass){
//handle display in subclass
handleDisplayData(output);
}
else {
Acct[] accountArray = new Acct[((AccountData)output).getAccount().size()];
mItems = ((AccountData)output).getAccount().toArray(accountArray);
IWMArrayAdapter<Acct> adapter = new IWMArrayAdapter<Acct>(this, mItems);
adapter.setIcons(mIcons);
adapter.setArrowNeeded();
//mList is superClassVariable
mList.setAdapter(adapter);
dismissDialog(PROGRESS_DIALOG);
adapter.notifyDataSetChanged();
}
}
public void handleDisplayData(SrOutput output){
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
//Toast.makeText(this, "Tapped search", Toast.LENGTH_SHORT).show();
super.onCreateOptionsMenu(menu);
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.list_servers_menu, menu);
// Calling super after populating the menu is necessary here to ensure
// that the
// action bar helpers have a chance to handle this event.
return true;
}
}
I have the following method signature for my calback method displayData in the outer class
public abstract <T> void displayData(T output);
Now I want to extend my outer class and implement displaydata method differently for extended classes based on the type of response object I am expecting.
When I define a method as below in subclass I am getting error as not a valid override:
@Override
public void displayData(ServerOutput output){}
Asynctask is invoked as :
new PerformOPTask<AccountData>(getString(R.string.get_account),AccountData.class).execute();
What is the correct way to do this. I am new to generics stuff so I am a little bit confused about all this. Thanks in advance for any help.
