我正在创建应用以加载特定公司的推文。为了使其与Android 2.3及更高版本兼容,我需要使用FragmentActivity& ListFragment。我正在使用AsyncTask在FragmentAcitivity类中获取关于app start的推文并添加选项卡并将它们加载到sqlite DB中。现在,在选项卡上单击我需要从我正在使用LoaderManager的sqllite DB加载这些推文,但是在选项卡点击上没有显示任何内容。这是我的代码片段:
FragmentActivity:
@Override
public void onTabChanged(String tag) {
Log.d(TAG, "onTabChanged");
TabInfo newTab = this.mapTabInfo.get(tag);
if (mLastTab != newTab) {
FragmentTransaction ft = this.getSupportFragmentManager().beginTransaction();
if (mLastTab != null) {
if (mLastTab.fragment != null) {
ft.detach(mLastTab.fragment);
}
}
if (newTab != null) {
if (newTab.fragment == null) {
newTab.fragment = (ListFragment) ListFragment.instantiate(this, newTab.clss.getName(), newTab.args);
ft.add(R.id.realtabcontent, newTab.fragment, newTab.tag);
} else {ft.attach(newTab.fragment);
}
}
mLastTab = newTab;
ft.commit();
this.getSupportFragmentManager().executePendingTransactions();
}
}
ListFragment:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Log.d(TAG, "onCreateView");
if (container == null) {
return null;
}
adapter = new SimpleCursorAdapter(getActivity().getApplicationContext(), R.layout.row, null,TweetStatusProvider.FROM,TweetStatusProvider.TO,CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
adapter.setViewBinder(VIEW_BINDER);
getLoaderManager().initLoader(STATUS_LOADER, null, this);
Log.d(TAG, "initLoader executed");
View view = inflater.inflate(R.layout.list_fragment_layout, container, false);
ListView listView = (ListView)view.findViewById(android.R.id.list);
listView.setAdapter(adapter);
return view;
}
布局: main.xml中:
<?xml version="1.0" encoding="utf-8"?>
'<'TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
android:layout_width="match_parent"
android:layout_height="match_parent" '>'
'<'LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/background"
android:orientation="vertical"
android:padding="10dp" '>'
'<'HorizontalScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="none" '>'
'<'TabWidget
android:id="@android:id/tabs"
android:layout_width="54dp"
android:layout_height="60dp" '/>'
'<'/HorizontalScrollView'>'
'<'FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="5dp" '>'
'<'/FrameLayout'>'
'<'FrameLayout
android:id="@+android:id/realtabcontent"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1" /'>'
'<'/LinearLayout'>'
'<'/TabHost'>'
list_fragment_layout.xml:
'<'?xml version="1.0" encoding="utf-8"?'>'
'<'LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" '>'
'<'ListView
android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content" '>'
'<'/ListView'>'
'<'/LinearLayout'>'
row.xml:
'<'?xml version="1.0" encoding="utf-8"?'>'
'<'RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" '>'
'<'TextView
android:id="@+id/text_user"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" /'>'
'<'TextView
android:id="@+id/text_created_at"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="10 minutes ago"
android:textAppearance="?android:attr/textAppearanceMedium" /'>'
'<'TextView
android:id="@+id/text_text"
android:autoLink="all"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/text_user"
android:text="Small Text"
android:textAppearance="?android:attr/textAppearanceSmall" /'>'
'<'/RelativeLayout'>'