我创建了一个带有3片段布局的活动,用户将滑动屏幕以显示另一个片段。
在我的第一个片段上,我计划让ListView显示用户的信息。 但是,我通常用于扩展活动的代码不适用于extends Fragment。 我研究了一下,最后摆脱了红线,但是当我显示片段时我的应用程序崩溃了。
这是我的代码:
public class LayoutOne extends ListFragment {
ListView myInfoList;
String[] items = {"Item 1", "Item 2"};
ArrayAdapter<CharSequence> adapter;
public static Fragment newInstance(Context context) {
LayoutOne f = new LayoutOne();
return f;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.layout_one, container, false);
return view;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
myInfoList = getListView();
adapter = new ArrayAdapter<CharSequence>(getActivity().getApplicationContext(), android.R.layout.simple_list_item_1, items);
myInfoList.setAdapter(adapter);
}
}
这是我的日志猫:
06-16 17:57:16.150:D / AndroidRuntime(20378):关闭VM 06-16 17:57:16.150:W / dalvikvm(20378):threadid = 1:线程退出未捕获异常(组= 0x40ff9930) 06-16 17:57:16.158:E / AndroidRuntime(20378):致命异常:主要 06-16 17:57:16.158:E / AndroidRuntime(20378):java.lang.RuntimeException:您的内容必须有一个ListView,其id属性为&#39; android.R.id.list&#39; 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.support.v4.app.ListFragment.ensureList(ListFragment.java:344) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.support.v4.app.ListFragment.onViewCreated(ListFragment.java:145) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:884) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1080) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.support.v4.app.BackStackRecord.run(BackStackRecord.java:622) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1416) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:431) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:139) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.support.v4.view.ViewPager.populate(ViewPager.java:804) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1016) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.view.View.measure(View.java:15523) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.widget.LinearLayout.measureVertical(LinearLayout.java:695) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.view.View.measure(View.java:15523) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.view.View.measure(View.java:15523) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.widget.LinearLayout.measureVertical(LinearLayout.java:847) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.view.View.measure(View.java:15523) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 06-16 17:57:16.158:E / AndroidRuntime(20378):at com.android.internal.policy.impl.PhoneWindow $ DecorView.onMeasure(PhoneWindow.java:2434) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.view.View.measure(View.java:15523) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.view.ViewRootImpl $ TraversalRunnable.run(ViewRootImpl.java:4351) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.view.Choreographer $ CallbackRecord.run(Choreographer.java:749) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.view.Choreographer.doCallbacks(Choreographer.java:562) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.view.Choreographer.doFrame(Choreographer.java:532) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.view.Choreographer $ FrameDisplayEventReceiver.run(Choreographer.java:735) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.os.Handler.handleCallback(Handler.java:725) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.os.Handler.dispatchMessage(Handler.java:92) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.os.Looper.loop(Looper.java:137) 06-16 17:57:16.158:E / AndroidRuntime(20378):在android.app.ActivityThread.main(ActivityThread.java:5233) 06-16 17:57:16.158:E / AndroidRuntime(20378):at java.lang.reflect.Method.invokeNative(Native Method) 06-16 17:57:16.158:E / AndroidRuntime(20378):at java.lang.reflect.Method.invoke(Method.java:511) 06-16 17:57:16.158:E / AndroidRuntime(20378):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:799) 06-16 17:57:16.158:E / AndroidRuntime(20378):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566) 06-16 17:57:16.158:E / AndroidRuntime(20378):at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分:2)
你永远不会初始化myInfoList
。 Ihmo你的类应该扩展ListFragment而不是Fragment。
你的onCreateView应该膨胀包含ListView的布局,你应该移动
adapter = new ArrayAdapter<CharSequence>(getActivity().getApplicationContext(), android.R.layout.simple_list_item_1, items);
myInfoList.setAdapter(adapter);
在onActivityCreate中:
public void onActivityCreated(Bundle savedInstanceState) {
myInfoList = getListView();
adapter = new ArrayAdapter<CharSequence>(getActivity().getApplicationContext(), android.R.layout.simple_list_item_1, items);
myInfoList.setAdapter(adapter);
}
ListView的ID必须是
android:id="@id/android:list"