使用片段：`错误膨胀类片段`

时间：2016-08-19 05:26:27

标签： android xml android-layout listview android-fragments

我正在练习Fragments，并创建了一个测试人员来熟悉这个过程。

我的目标是创建一个简单的应用程序，其中包含由10个字符串组成的ListView。 ListView包含在MainActivity中的一个片段中。

但是，我遇到了错误...... 

bash

这是我的相关代码......

activity_main.xml中： 

   FATAL EXCEPTION: main
   Process: com.example.frank.listview_test, PID: 5819
   java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.frank.listview_test/com.example.frank.listview_test.MainActivity}: android.view.InflateException: Binary XML file line #14: Binary XML file line #14: Error inflating class fragment
       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3253)
       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349)
       at android.app.ActivityThread.access$1100(ActivityThread.java:221)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:158)
       at android.app.ActivityThread.main(ActivityThread.java:7224)
       at java.lang.reflect.Method.invoke(Native Method)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
    Caused by: android.view.InflateException: Binary XML file line #14: Binary XML file line #14: Error inflating class fragment
       at android.view.LayoutInflater.inflate(LayoutInflater.java:551)
       at android.view.LayoutInflater.inflate(LayoutInflater.java:429)
       at android.view.LayoutInflater.inflate(LayoutInflater.java:380)
       at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:284)
       at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
       at com.example.frank.listview_test.MainActivity.onCreate(MainActivity.java:17)
       at android.app.Activity.performCreate(Activity.java:6876)
       at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135)
       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3206)
       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349) 
       at android.app.ActivityThread.access$1100(ActivityThread.java:221) 
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794) 
       at android.os.Handler.dispatchMessage(Handler.java:102) 
       at android.os.Looper.loop(Looper.java:158) 
       at android.app.ActivityThread.main(ActivityThread.java:7224) 
       at java.lang.reflect.Method.invoke(Native Method) 
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 
    Caused by: android.view.InflateException: Binary XML file line #14: Error inflating class fragment
       at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:794)
       at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:716)
       at android.view.LayoutInflater.rInflate(LayoutInflater.java:847)
       at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:810)
       at android.view.LayoutInflater.inflate(LayoutInflater.java:527)
       at android.view.LayoutInflater.inflate(LayoutInflater.java:429) 
       at android.view.LayoutInflater.inflate(LayoutInflater.java:380) 
       at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:284) 
       at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140) 
       at com.example.frank.listview_test.MainActivity.onCreate(MainActivity.java:17) 
       at android.app.Activity.performCreate(Activity.java:6876) 
       at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135) 
       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3206) 
       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349) 
       at android.app.ActivityThread.access$1100(ActivityThread.java:221) 
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794) 
       at android.os.Handler.dispatchMessage(Handler.java:102) 
       at android.os.Looper.loop(Looper.java:158) 
       at android.app.ActivityThread.main(ActivityThread.java:7224) 
       at java.lang.reflect.Method.invoke(Native Method) 
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 
    Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference
       at com.example.frank.listview_test.MainActivity$TestListFragment.onCreateView(MainActivity.java:37)
       at android.app.Fragment.performCreateView(Fragment.java:2281)
       at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:954)
       at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1141)
       at android.app.FragmentManagerImpl.addFragment(FragmentManager.java:1245)
       at android.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2218)
       at android.app.FragmentController.onCreateView(FragmentController.java:98)
       at android.app.Activity.onCreateView(Activity.java:6070)
       at android.support.v4.app.BaseFragmentActivityHoneycomb.onCreateView(BaseFragmentActivityHoneycomb.java:36)
       at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:75)
       at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:766)
       at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:716) 
       at android.view.LayoutInflater.rInflate(LayoutInflater.java:847) 
       at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:810) 
       at android.view.LayoutInflater.inflate(LayoutInflater.java:527) 
       at android.view.LayoutInflater.inflate(LayoutInflater.java:429) 
       at android.view.LayoutInflater.inflate(LayoutInflater.java:380) 
       at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:284) 
       at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140) 
       at com.example.frank.listview_test.MainActivity.onCreate(MainActivity.java:17) 
       at android.app.Activity.performCreate(Activity.java:6876) 
       at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135) 
       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3206) 
       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349) 
       at android.app.ActivityThread.access$1100(ActivityThread.java:221) 
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794) 
       at android.os.Handler.dispatchMessage(Handler.java:102) 
       at android.os.Looper.loop(Looper.java:158) 
       at android.app.ActivityThread.main(ActivityThread.java:7224) 
       at java.lang.reflect.Method.invoke(Native Method) 
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 

list_fragment.xml： 

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:background="#FFFFFF"
    android:gravity="center"
    tools:context="com.example.frank.listview_test.MainActivity">

    <fragment android:name="com.example.frank.listview_test.MainActivity$TestListFragment"
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</FrameLayout>

list_item.xml： 

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/listFragment"
    android:layout_width="match_parent" android:layout_height="match_parent">

    <ListView
        android:id="@+id/testListView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center" />

</FrameLayout>

MainActivity.java： 

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="70dp"
    android:textSize="50sp"
    android:textColor="#000000"
    android:layout_gravity="center"/>

这段代码中是否有任何可能导致此错误的错误？

3 个答案:

答案 0 :(得分：2)

您的片段代码onCreateView()应首先使包含list_fragment的{​​{1}}布局膨胀。然后你应该在膨胀的布局上调用ListView而不是活动，因为片段布局还不是活动视图层次结构的一部分。

例如：

findViewById()

答案 1 :(得分：0)

试试这个：

View view = inflater.inflate(R.layout.list_fragment, container, false);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(),R.layout.list_item , myStringArray);
            listView = (ListView) view.findViewById(R.id.testListView);
            listView.setAdapter(adapter);
return view;

答案 2 :(得分：0)

当我们要在运行时加载活动上的片段时，可能会发生此错误。 所以，代码模式就像，

有三个文件： 1. MainActivity.java 2. WelcomeFragment.java 3. LoginFragment.java

MainActivity.java 

FragmentManager fragmentManager = getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

    WelcomeFragment f1 = new WelcomeFragment();
    fragmentTransaction.replace(R.id.fragmentContainer, f1);
    fragmentTransaction.addToBackStack(null);
    fragmentTransaction.commit();

WelcomeFragment.java 

 public class WelcomeFragment extends Fragment {
Button btnLogin;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.layout_fragment_welcome, container, false);
    return view;
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    btnLogin = view.findViewById(R.id.btnLogin);
    btnLogin.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            FragmentManager fragmentManager = getFragmentManager();
            LoginFragment f2 = new LoginFragment();
            FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
            fragmentTransaction.replace(R.id.fragmentContainer, f2);
            fragmentTransaction.addToBackStack(null);
            fragmentTransaction.commit();
        }
    });
}

}

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