getSupportFragmentManager getFragment没有标签或标识 [英] getSupportFragmentManager getFragment without tag or id
问题描述
我开发一个Android 3.1平板电脑的应用程序。
I'm developing an Android 3.1 Tablet application.
我使用的是一个活动ViewPager和片段。我的问题是，我不知道如何设置一个ID或标记为片段。
I'm using ViewPager and fragments on one activity. My problem is that I don't know how to set an ID or Tag to fragments.
活动
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
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 /价值/ ids.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<item type="id" name="frag_general_info_factory"/>
<item type="id" name="frag_general_info_items"/>
</resources>
FactoryInfoFragment
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
<?xml version="1.0" encoding="utf-8"?>
<TableLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_margin="10dp"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:shrinkColumns="*"
android:stretchColumns="*">
<TableRow
android:weightSum="1"> <!-- 0 -->
<TextView
android:id="@+id/txtGenInfo"
android:layout_span="8"
android:layout_gravity="center_horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/layout_title_general_information"
android:textAppearance="?android:attr/textAppearanceLarge" />
</TableRow>
...
</TableLayout>
在这里我要得到一个特定的片段
private class LoadEReportAsyncTask extends AsyncTask<String, Void, Boolean>
{
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();
}
}
这里：
<$c$c>(FactoryInfoFragment)getSupportFragmentManager().findFragmentById(R.id.frag_general_info_factory);
我用 R.id.frag_general_info_factory 来获取片段引用，但我得到的无效
I use R.id.frag_general_info_factory to get that fragment reference but I get a null.
如何能我设置一个标签或一个ID FactoryInfoFragment
How can I set a Tag or an Id to FactoryInfoFragment?
推荐答案
您可以通过查看ViewPager增加了它的 ID 得到一个片段：
You can get a Fragment by using the id of the View the ViewPager adds it to:
getFragmentManager().findFragmentById(R.id.frameWhichFragmentHasBeenAddedTo);
您的问题是找到此ID。我已经通过了<一个运行href=\"http://$c$c.google.com/p/openintents/source/browse/trunk/compatibility/AndroidSupportV2/src/android/support/v2/view/ViewPager.java?r=3488\"相对=nofollow>来源$ C $ C 为 ViewPager ，并没有跳出来，如果有的话我会建议它使用本身（的ViewGroup ），所以你应该在这种情况下使用id是 R.id.pager ;
Your problem is finding this id. I've run through the source code for ViewPager and it doesn't jump out, if anything I would suggest it uses itself (a ViewGroup) so the id you should use in this instance would be R.id.pager;
NB
您可能还希望混合时要非常小心， android.support.v4.app.Fragment 和 android.app.Fragment - 这意味着在支持库或蜂窝+ API使用功能之间的差异
You may also want to be very careful when mixing android.support.v4.app.Fragment and android.app.Fragment - It means the difference between using the functionality in the support library or in the Honeycomb+ API.
即，如果使用 android.support.v4.app.Fragment ：
getSupportFragmentManager();
否则，如果你使用 android.app.Fragment ：
getFragmentManager();
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