Question

我有一个包含4个片段的slidinglayout，其中一个片段应该在侧面使用listview但是当我运行我的应用程序时崩溃，所以这里是我的代码。

news.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" >

    <ListView
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true" >
    </ListView>

</RelativeLayout>

这是我的news.java

public class News extends Fragment {
    ListView myListView;
    String[] news={"first","Secound","Third"}; 
    @Override
    public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState){

        View rootView= inflater.inflate(R.layout.news, container, false);
        myListView = (ListView) rootView.findViewById(R.id.listview);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this.getActivity(), android.R.layout.simple_list_item_1, news);
        myListView.setAdapter(adapter);
        return rootView;
    }

这里是slidinglayout片段管理器

class MyAdapter extends FragmentPagerAdapter{



    public MyAdapter(FragmentManager fm) {
        super(fm);

        // TODO Auto-generated constructor stub
    }
    @Override
    public Fragment getItem(int position) {
        // TODO Auto-generated method stub
        Fragment fragment=null;
        if(position==0){
            fragment=new Generalization();

        }
        if(position==1){
            fragment=new Report();

        }
        if(position==2){
            fragment=new Templet();

        }
        if(position==3){
            fragment=new News();

        }
        return fragment;
    }



    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return 4;
    }
    @Override
    public CharSequence getPageTitle(int position){
        String title="";
        if(position==0){
            title="     تعميم     ";
        }
        if(position==1){
            title="     نماذج     ";
        }
        if(position==2){
            title="     تقارير     ";
        }
        if(position==3){
            title="     أخبار     ";
        }
        return title;

    }

}

请告诉我错误在哪里，

这里是logcat ,,

02-05 12:38:24.361: E/AndroidRuntime(1407):     at com.uigtc.kasd.SlidingTabLayout$TabClickListener.onClick(SlidingTabLayout.java:315)
02-05 12:38:24.361: E/AndroidRuntime(1407):     at android.view.View.performClick(View.java:4438)
02-05 12:38:24.361: E/AndroidRuntime(1407):     at android.view.View$PerformClick.run(View.java:18422)
02-05 12:38:24.361: E/AndroidRuntime(1407):     at android.os.Handler.handleCallback(Handler.java:733)
02-05 12:38:24.361: E/AndroidRuntime(1407):     at android.os.Handler.dispatchMessage(Handler.java:95)
02-05 12:38:24.361: E/AndroidRuntime(1407):     at android.os.Looper.loop(Looper.java:136)
02-05 12:38:24.361: E/AndroidRuntime(1407):     at android.app.ActivityThread.main(ActivityThread.java:5001)
02-05 12:38:24.361: E/AndroidRuntime(1407):     at java.lang.reflect.Method.invokeNative(Native Method)
02-05 12:38:24.361: E/AndroidRuntime(1407):     at java.lang.reflect.Method.invoke(Method.java:515)
02-05 12:38:24.361: E/AndroidRuntime(1407):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
02-05 12:38:24.361: E/AndroidRuntime(1407):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
02-05 12:38:24.361: E/AndroidRuntime(1407):     at dalvik.system.NativeStart.main(Native Method)
02-05 12:38:26.353: D/dalvikvm(1532): GC_FOR_ALLOC freed 61K, 4% free 3772K/3928K, paused 3ms, total 3ms
02-05 12:38:26.353: I/dalvikvm-heap(1532): Grow heap (frag case) to 4.376MB for 637572-byte allocation
02-05 12:38:26.389: D/dalvikvm(1532): GC_FOR_ALLOC freed 2K, 4% free 4392K/4552K, paused 8ms, total 8ms
02-05 12:38:26.413: D/dalvikvm(1532): GC_FOR_ALLOC freed 6K, 3% free 4853K/4992K, paused 3ms, total 3ms
02-05 12:38:26.421: D/dalvikvm(1532): GC_FOR_ALLOC freed 6K, 3% free 4921K/5056K, paused 5ms, total 5ms
02-05 12:38:26.429: I/dalvikvm-heap(1532): Grow heap (frag case) to 8.890MB for 4194316-byte allocation
02-05 12:38:26.437: D/dalvikvm(1532): GC_FOR_ALLOC freed <1K, 2% free 9017K/9156K, paused 10ms, total 10ms
02-05 12:38:26.549: D/libEGL(1532): loaded /system/lib/egl/libEGL_genymotion.so
02-05 12:38:26.553: D/(1532): HostConnection::get() New Host Connection established 0xb860fbf8, tid 1532
02-05 12:38:26.573: D/libEGL(1532): loaded /system/lib/egl/libGLESv1_CM_genymotion.so
02-05 12:38:26.577: D/libEGL(1532): loaded /system/lib/egl/libGLESv2_genymotion.so
02-05 12:38:26.621: W/EGL_genymotion(1532): eglSurfaceAttrib not implemented
02-05 12:38:26.625: E/OpenGLRenderer(1532): Getting MAX_TEXTURE_SIZE from GradienCache
02-05 12:38:26.625: E/OpenGLRenderer(1532): MAX_TEXTURE_SIZE: 8192
02-05 12:38:26.637: E/OpenGLRenderer(1532): Getting MAX_TEXTURE_SIZE from Caches::initConstraints()
02-05 12:38:26.641: E/OpenGLRenderer(1532): MAX_TEXTURE_SIZE: 8192
02-05 12:38:26.641: D/OpenGLRenderer(1532): Enabling debug mode 0

Answer 1

当您在Android应用程序中使用片段时，您无法在onCreateView方法中填充其中的窗口小部件数据，因为尚未将视图放置在屏幕上（需要返回）。因此，在片段生命周期中，首先使用onCreateView放置布局，然后在onCreate方法中填充小部件

所以解决方法是让你的onCreateView看起来像这样：

public class News extends Fragment {
ListView myListView;
String[] news={"first","Secound","Third"}; 
@Override
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState){
    return inflater.inflate(R.layout.news , container , false);
}

并在片段的onCreate函数中填充ListView数据。要使用View，您只需要调用

getView().findViewById(R.id.listview);....

祝你好运

Answer 2

你可能遇到了＆＃34; getActivity＆＃34;有时返回＆＃34; null＆＃34;。尝试将参考文献存储在＆＃34; onAttach＆＃34;方法，然后用它来创建你的适配器：

Activity activity

@Override
void onAttach (Activity activity) {
    this.activity = activity;
}

@Override
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState){
    ...
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(activity, android.R.layout.simple_list_item_1, news);
    myListView.setAdapter(adapter);
    ...
}

希望这有帮助

如何将列表视图创建为片段

2 个答案: