GetSupportFragmentManager getFragment without tag or id ⇐ Android

[Anonymous]

Ich entwickle eine Tablet-Anwendung für Android 3.1.

Ich verwende ViewPager und Fragmente für eine Aktivität. Mein Problem ist, dass ich nicht weiß, wie ich Fragmenten eine ID oder ein Tag zuweisen soll.

Aktivität

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public class FillEReportFragmentActivity extends FragmentActivity
{
...

/**
* View Pager to manage form parts.
*/
private ViewPager mViewPager;
/**
* Page Adapter to handle fragments.
*/
private FillEReportFragmentPagerAdapter mPagerAdapter;

@Override
protected void onCreate(Bundle savedInstance)
{
Log.v("FillEReportFragmentActivity", "onCreate");

super.onCreate(savedInstance);
setContentView(R.layout.fill_ereport_paged);

// Recoge los argumentos que le llegan de la actividad padre.
Bundle extras = getIntent().getExtras();
if (extras != null)
{
qapId = extras.getLong(BundleKeys.qapIdKey);
orderId = extras.getLong(BundleKeys.orderIdKey);
eReportId = extras.getLong(BundleKeys.eReportIdKey);
}

// Cargamos el E-Report o creamos uno nuevo.  Además se recuperan los
// artículos de la orden actual.
LoadEReportAsyncTask task = new LoadEReportAsyncTask(this);
task.execute(Long.toString(this.qapId));

// Establezco los fragmentos (o partes del form) que se mostrarán en el
// View Pager.
mViewPager = (ViewPager)findViewById(R.id.pager);
mPagerAdapter = new FillEReportFragmentPagerAdapter(getSupportFragmentManager());
mViewPager.setAdapter(mPagerAdapter);

// Muestro en la parte inferior unos círculos para indicar donde me
// encuentro dentro del E-Report.
CirclePageIndicator mIndicator = (CirclePageIndicator)findViewById(R.id.indicator);
mIndicator.setViewPager(mViewPager);

// Creo unos tabs para poder navegar más facilmente a través de las
// partes del E-Report.
TabPageIndicator titleIndicator = (TabPageIndicator)findViewById(R.id.tabIndicator);
titleIndicator.setViewPager(mViewPager);
}

...
}

FragmentPagerAdapter

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public class FillEReportFragmentPagerAdapter extends FragmentPagerAdapter
{
private static final String[] TITLES = new String[] {
"Factory",
"Items"
};

public FillEReportFragmentPagerAdapter(FragmentManager fm)
{
super(fm);
// TODO Auto-generated constructor stub
}

@Override
public Fragment getItem(int index)
{
switch (index)
{
case 0:
return FactoryInfoFragment.newInstance();
case 1:
return ItemsFragment.newInstance();

default:
return null;
}
}

@Override
public int getCount()
{
return 2; // TODO: Este número hay que cambiarlo porque serán más.
}

public String getPageTitle(int position)
{
return TITLES[position];
}
}

res/values/ids.xml

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FactoryInfoFragment

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public class FactoryInfoFragment extends Fragment
{
public static FactoryInfoFragment newInstance()
{
FactoryInfoFragment frag = new FactoryInfoFragment();

return frag;
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
Log.v("FactoryInfoFragment", "onCreateView");

View v = inflater.inflate(R.layout.frag_general_info_factory, container, false);
view.setId(R.id.frag_general_info_factory);

return v;
}
}

frag_general_info_factory.xml

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...

Hier möchte ich ein bestimmtes Fragment erhalten

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private class LoadEReportAsyncTask extends AsyncTask
{
private Context mContext;
private ProgressDialog loadingDialog;
private EReport eReport;
private QAP qap;

public LoadEReportAsyncTask(Context context)
{
Log.v("LoadEReportAsyncTask", "constructor");
eReport = null;
qap = null;

this.mContext = context;
loadingDialog = new ProgressDialog(mContext);
loadingDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
loadingDialog.setMessage(getString(R.string.msg_loading_ereport));
loadingDialog.setCancelable(false);
loadingDialog.show();
}

@Override
protected Boolean doInBackground(String... params)
{
Log.v("LoadEReportAsyncTask", "doInBackground");
...
}

protected void onPostExecute(Boolean result)
{
Log.v("LoadEReportAsyncTask", "onPostExecute");

FillEReportFragmentActivity parentActivity = (FillEReportFragmentActivity) mContext;
if (result)
{
FactoryInfoFragment factFragment = (FactoryInfoFragment)getSupportFragmentManager().findFragmentById(R.id.frag_general_info_factory);
factFragment.fillEReport(eReport, qap);

Toast.makeText(getApplicationContext(), getString(R.string.msg_ereport_got_correct), Toast.LENGTH_SHORT).show();

ItemsFragment fragment = (ItemsFragment)getSupportFragmentManager().findFragmentById(R.id.frag_general_info_items);
fragment.setUpArticles(orderArticles);
}
else
{
Toast.makeText(getApplicationContext(), getString(R.string.msg_ereport_problem), Toast.LENGTH_LONG).show();
}

loadingDialog.dismiss();
}
}

Hier:

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(FactoryInfoFragment)getSupportFragmentManager().findFragmentById(R.id.frag_general_info_factory);

Ich verwende R.id.frag_general_info_factory, um diese Fragmentreferenz zu erhalten, aber ich erhalte eine Null.

Wie kann ich ein Tag oder eine ID für FactoryInfoFragment festlegen?