【发布时间】：2013-11-28 17:00:50
【问题描述】：
我有一个选项卡式视图活动，其中包含 3 个选项卡和每个选项卡中的一个片段。这些片段由链接到查看器的FragmentPageAdapter 管理。
一切正常，直到我尝试拥有第 4 个片段 (ServiceSpecifNotListFragment)，它是由 @987654323 管理的片段之一 (ServicesListFragment) 的嵌套片段@。
当我尝试用 ServiceSpecifNotListFragment 替换 ServicesListFragment 时。我设法用 ServiceSpecifNotListFragment 仅替换 ServicesListFragment 中的列表元素，ServicesListFragment 中的另一个视图控制器（一个按钮）仍然存在....
我一直想知道问题是否在于我用它的子片段替换片段的方法是transaction.replace(R.id.service_list_fragment, newFragment).commit();，service_list_fragment是listfragment主线性布局的id，其中包含使用 id 定义的列表视图：@id/android:list
我找到的最接近的问答是this one，但据我所知，我正确使用了片段容器 ID。
这是代码和布局：
ServicesListFragment（嵌套片段的父级）的布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/service_list_fragment">
<Button
android:id="@+id/addServiceButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="AddService" />
<ListView android:id="@id/android:list"
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_weight="1"
android:drawSelectorOnTop="false"/>
<TextView android:id="@id/android:empty"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="No data"/>
</LinearLayout>
ServiceSpecifNotListFragment的布局（要嵌套的片段）
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/service_notif_list_fragment" >
<ListView android:id="@id/android:list"
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_weight="1"
android:drawSelectorOnTop="false"/>
<TextView android:id="@id/android:empty"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="No data"/>
</LinearLayout>
主要活动xml布局（基本上是对pager的引用）：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v4.view.ViewPager>
ServiceListFragment源码，片段嵌套调用在onListItemClick：
public class ServicesListFragment extends ListFragment {
private final String TAG = "ServicesListFragment";
Button addButton = null;
ServiceNotifRowAdapter adapter;
ArrayList<NotifService> list = new ArrayList<NotifService>();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Activity parent = getActivity();
// some ommited code for populating adapter with list of stored subscriptions
adapter = new ServiceNotifRowAdapter(getActivity().getApplicationContext(),list);
setListAdapter(adapter);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.servicelist_fragment, container, false);
addButton = (Button) rootView.findViewById(R.id.addServiceButton);
MainActivity m = (MainActivity) getActivity();
addButton.setOnClickListener(m);
return rootView;
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
NotifService item = (NotifService) getListAdapter().getItem(position);
Log.d(TAG, "selected service " + item.getServiceURI());
Fragment newFragment = new ServiceSpecifNotListFragment();
Bundle bundle = new Bundle();
bundle.putString("service", item.getServiceURI());
newFragment.setArguments(bundle);
FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
transaction.addToBackStack(null);
transaction.replace(R.id.service_list_fragment, newFragment).commit();
}
主要活动java代码
public class MainActivity extends FragmentActivity implements TabListener, AddServiceDialogFragmentListener
, OnClickListener{
private final String TAG = "MQTT main activity";
private ViewPager viewPager;
private TabsPagerAdapter mAdapter;
private ActionBar actionBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initilization
viewPager = (ViewPager) findViewById(R.id.pager);
actionBar = getActionBar();
List<Fragment> fragments = new Vector<Fragment>();
fragments.add(Fragment.instantiate(this, StatusListFragment.class.getName()));
fragments.add(Fragment.instantiate(this, ServicesListFragment.class.getName()));
fragments.add(Fragment.instantiate(this, ConfigFragment.class.getName()));
mAdapter = new TabsPagerAdapter(getSupportFragmentManager(),fragments);
viewPager.setAdapter(mAdapter);
actionBar.setHomeButtonEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Adding Tabs
for (String tab_name : MqttApplication.tabs) {
actionBar.addTab(actionBar.newTab().setText(tab_name)
.setTabListener(this));
}
/**
* on swiping the viewpager make respective tab selected
* */
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageSelected(int position) {
// on changing the page
// make respected tab selected
actionBar.setSelectedNavigationItem(position);
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageScrollStateChanged(int arg0) {
}
});
// lock the screen in portrait mode
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
}
标签页适配器
public class TabsPagerAdapter extends FragmentPagerAdapter {
private List<Fragment> fragments;
private FragmentManager fm;
private final String TAG = "TabsPagerAdapter";
public TabsPagerAdapter(FragmentManager fm,List<Fragment> fragments) {
super(fm);
this.fm = fm;
this.fragments = fragments;
}
@Override
public Fragment getItem(int index) {
return this.fragments.get(index);
}
@Override
public int getCount() {
return this.fragments.size();
}
// 0 - Status, 1 Service, 2 Config (due to the order in which they have been added)
public Fragment findFragmentByPosition(int position) {
return fm.findFragmentByTag(
"android:switcher:" + R.id.pager + ":"
+ this.getItemId(position));
}
}
【问题讨论】：
-
能否请您发布您用于加载父片段的 xml 和 java 文件？即您已实现片段寻呼机适配器的文件
标签： java android android-layout android-fragments android-listfragment