二进制XML文件第20行:膨胀类片段Android时出错 [英] Binary XML file line #20: Error inflating class fragment Android

问题描述

我想在平板电脑视图中显示列表和说明.下面的代码在纵向模式下可以正常工作，但是在横向模式下可以停止.有什么问题吗?

I want to show the list+Description in tablet view. Code below works fine with Portrait mode but stopped when in Landscape mode. Is it something wrong?

MainActivity

    import android.os.Bundle;
    import android.app.Activity;
    import android.app.Fragment;
    import android.app.FragmentTransaction;
    import android.app.ListFragment;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ArrayAdapter;
    import android.widget.ListAdapter;

    public class MainActivity extends Activity {

        // if run on phone, isSinglePane = true
        // if run on tablet, isSinglePane = false
        boolean isSinglePane;

        static String[] month ={
                "January", "February", "March", "April",
                "May", "June", "July", "August",
                "September", "October", "November", "December"};

        public static class MyListFragment extends ListFragment {

            @Override
            public void onActivityCreated(Bundle savedInstanceState) {
                // TODO Auto-generated method stub
                super.onActivityCreated(savedInstanceState);

                ListAdapter myArrayAdapter =
                        new ArrayAdapter<String>(
                                getActivity(), android.R.layout.simple_list_item_1, month);
                setListAdapter(myArrayAdapter);

            }

        }

        public static class MyDetailFragment extends Fragment {

            @Override
            public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                     Bundle savedInstanceState) {
                // TODO Auto-generated method stub
                View view = inflater.inflate(R.layout.layout_detailfragment, null);
                return view;
            }

        }

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            View v = findViewById(R.id.phone_container);
            if(v == null){
                //it's run on tablet
                isSinglePane = false;
       /*
        * MyListFragment and MyDetailFragment have been loaded in XML,
        * no need load.
        */

            }else{
                //it's run on phone
                //Load MyListFragment programmatically
                isSinglePane = true;

                if(savedInstanceState == null){
                    //if's the first time created
                    MyListFragment myListFragment = new MyListFragment();
                    FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
                    fragmentTransaction.add(R.id.phone_container, myListFragment);
                    fragmentTransaction.commit();
                }
            }
        }
    }

Layout/activityMain.xml

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

        <fragment
            android:id="@+id/titles"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
             />

    </FrameLayout>

res/Layout-land/activitymain.xml

    <LinearLayout 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:orientation="vertical"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Normal" />

    <FrameLayout
        android:id="@+id/phone_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </FrameLayout>

</LinearLayout>

LayoutdetailFragment.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical">

    <TextView
        android:id="@+id/title_detailfragment"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Detail Fragment"/>

</LinearLayout>

错误

E/Android运行时:致命异常:主要流程:com.example.fyp_awais.tab，PID:3974java.lang.RuntimeException:无法启动活动ComponentInfo {com.example.fyp_awais.tab/com.example.fyp_awais.tab.MainActivity}:android.view.InflateException:二进制XML文件第20行:夸大类片段的错误在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)在android.app.ActivityThread.access $ 800(ActivityThread.java:151)在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1303)在android.os.Handler.dispatchMessage(Handler.java:102)在android.os.Looper.loop(Looper.java:135)在android.app.ActivityThread.main(ActivityThread.java:5254)在java.lang.reflect.Method.invoke(本机方法)在java.lang.reflect.Method.invoke(Method.java:372)在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:903)在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)原因:android.view.InflateException:二进制XML文件第20行:错误夸大了类片段在android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:763)在android.view.LayoutInflater.rInflate(LayoutInflater.java:806)在android.view.LayoutInflater.rInflate(LayoutInflater.java:809)在android.view.LayoutInflater.inflate(LayoutInflater.java:504)在android.view.LayoutInflater.inflate(LayoutInflater.java:414)在android.view.LayoutInflater.inflate(LayoutInflater.java:365)在com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:378)在android.app.Activity.setContentView(Activity.java:2145)在com.example.fyp_awais.tab.MainActivity.onCreate(MainActivity.java:56)在android.app.Activity.performCreate(Activity.java:5990)在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)在android.app.ActivityThread.access $ 800(ActivityThread.java:151)在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1303)在android.os.Handler.dispatchMessage(Handler.java:102)在android.os.Looper.loop(Looper.java:135)在android.app.ActivityThread.main(ActivityThread.java:5254)在java.lang.reflect.Method.invoke(本机方法)在java.lang.reflect.Method.invoke(Method.java:372)在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:903)在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)造成原因:java.lang.NullPointerException在java.lang.VMClassLoader.findLoadedClass(本地方法)在java.lang.ClassLoader.findLoadedClass(ClassLoader.java:362)在java.lang.ClassLoader.loadClass(ClassLoader.java:499)在java.lang.ClassLoader.loadClass(ClassLoader.java:469)在android.app.Fragment.instantiate(Fragment.java:604)在android.app.Fragment.instantiate(Fragment.java:582)在android.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2108)在android.app.Activity.onCreateView(Activity.java:5328)在android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:733)在android.view.LayoutInflater.rInflate(LayoutInflater.java:806)在android.view.LayoutInflater.rInflate(LayoutInflater.java:809)在android.view.LayoutInflater.inflate(LayoutInflater.java:504)在android.view.LayoutInflater.inflate(LayoutInflater.java:414)在android.view.LayoutInflater.inflate(LayoutInflater.java:365)在com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:378)在android.app.Activity.setContentView(Activity.java:2145)在com.example.fyp_awais.tab.MainActivity.onCreate(MainActivity.java:56)在android.app.Activity.performCreate(Activity.java:5990)在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)在android.app.ActivityThread.access $ 800(ActivityThread.java:151)在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1303)在android.os.Handler.dispatchMessage(Handler.java:102)在android.os.Looper.loop(Looper.java:135)在android.app.ActivityThread.main(ActivityThread.java:5254)在java.lang.reflect.Method.invoke(本机方法)在java.lang.reflect.Method.invoke(Method.java:372)在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:903)在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)应用已终止.

E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.fyp_awais.tab, PID: 3974 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.fyp_awais.tab/com.example.fyp_awais.tab.MainActivity}: android.view.InflateException: Binary XML file line #20: Error inflating class fragment at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387) at android.app.ActivityThread.access$800(ActivityThread.java:151) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5254) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) Caused by: android.view.InflateException: Binary XML file line #20: Error inflating class fragment at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:763) at android.view.LayoutInflater.rInflate(LayoutInflater.java:806) at android.view.LayoutInflater.rInflate(LayoutInflater.java:809) at android.view.LayoutInflater.inflate(LayoutInflater.java:504) at android.view.LayoutInflater.inflate(LayoutInflater.java:414) at android.view.LayoutInflater.inflate(LayoutInflater.java:365) at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:378) at android.app.Activity.setContentView(Activity.java:2145) at com.example.fyp_awais.tab.MainActivity.onCreate(MainActivity.java:56) at android.app.Activity.performCreate(Activity.java:5990) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)  at android.app.ActivityThread.access$800(ActivityThread.java:151)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)  at android.os.Handler.dispatchMessage(Handler.java:102)  at android.os.Looper.loop(Looper.java:135)  at android.app.ActivityThread.main(ActivityThread.java:5254)  at java.lang.reflect.Method.invoke(Native Method)  at java.lang.reflect.Method.invoke(Method.java:372)  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)  Caused by: java.lang.NullPointerException at java.lang.VMClassLoader.findLoadedClass(Native Method) at java.lang.ClassLoader.findLoadedClass(ClassLoader.java:362) at java.lang.ClassLoader.loadClass(ClassLoader.java:499) at java.lang.ClassLoader.loadClass(ClassLoader.java:469) at android.app.Fragment.instantiate(Fragment.java:604) at android.app.Fragment.instantiate(Fragment.java:582) at android.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2108) at android.app.Activity.onCreateView(Activity.java:5328) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:733) at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)  at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)  at android.view.LayoutInflater.inflate(LayoutInflater.java:504)  at android.view.LayoutInflater.inflate(LayoutInflater.java:414)  at android.view.LayoutInflater.inflate(LayoutInflater.java:365)  at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:378)  at android.app.Activity.setContentView(Activity.java:2145)  at com.example.fyp_awais.tab.MainActivity.onCreate(MainActivity.java:56)  at android.app.Activity.performCreate(Activity.java:5990)  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)  at android.app.ActivityThread.access$800(ActivityThread.java:151)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)  at android.os.Handler.dispatchMessage(Handler.java:102)  at android.os.Looper.loop(Looper.java:135)  at android.app.ActivityThread.main(ActivityThread.java:5254)  at java.lang.reflect.Method.invoke(Native Method)  at java.lang.reflect.Method.invoke(Method.java:372)  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)  Application terminated.

推荐答案

您确定在 landscape 模式下遇到错误吗?因为在 landscape 正常运行且在 portrait 模式下，您没有使用动态片段，因此您需要扩展 Fragment Activity 而不是Activity才能运行片段.如果您使用动态片段而不是硬编码，那就太好了.

Are you sure you are getting error in landscape mode? because in landscape its running fine and in portrait mode you are not using dynamic fragment so that you need to extend Fragment Activity instead of Activity to run the fragment. It would be good if you use dynamic fragment instead hard-coded.

将您的layout-port/main_activity更改为此

Change your layout-port/main_activity to this

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout  xmlns:android="http://schemas.android.com/apk/res/android"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             android:id="@+id/phone_container2"
    >

  // remove hard coded fragment

</FrameLayout>

//您的完整解决方案

主要活动

import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.app.ListFragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;

public class MainActivity extends Activity {

    // if run on phone, isSinglePane = true
    // if run on tablet, isSinglePane = false
    boolean isSinglePane;

    static String[] month ={
            "January", "February", "March", "April",
            "May", "June", "July", "August",
            "September", "October", "November", "December"};

    public static class MyListFragment extends ListFragment {

        @Override
        public void onActivityCreated(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onActivityCreated(savedInstanceState);

            ListAdapter myArrayAdapter =
                    new ArrayAdapter<String>(
                            getActivity(), android.R.layout.simple_list_item_1, month);
            setListAdapter(myArrayAdapter);

        }

    }

    public static class MyDetailFragment extends Fragment {

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            View view = inflater.inflate(R.layout.layout_detailfragment, null);
            return view;
        }

    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        View v = findViewById(R.id.phone_container);
        if(v == null){
            //it's run on tablet
            isSinglePane = false;

            //if's the first time created
            MyDetailFragment myListFragment = new MyDetailFragment();
            FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
            fragmentTransaction.add(R.id.phone_container2, myListFragment);
            fragmentTransaction.commit();



       /*
        * MyListFragment and MyDetailFragment have been loaded in XML,
        * no need load.
        */

        }else{
            //it's run on phone
            //Load MyListFragment programmatically
            isSinglePane = true;


                //if's the first time created
                MyListFragment myListFragment = new MyListFragment();
                FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
                fragmentTransaction.add(R.id.phone_container, myListFragment);
                fragmentTransaction.commit();

        }
    }
}

端口:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             android:id="@+id/phone_container2"
    >

  <!--  <fragment
        android:id="@+id/titles"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />-->

</FrameLayout>

土地:

<LinearLayout 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:orientation="vertical"
              tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Normal" />

    <FrameLayout
        android:id="@+id/phone_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </FrameLayout>

</LinearLayout>

这篇关于二进制XML文件第20行:膨胀类片段Android时出错的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！