二进制XML文件行＃20：错误膨胀类片段Android-Java 学习之路

我想在平板电脑视图中显示列表说明 . 以下代码在纵向模式下工作正常，但在横向模式下停止 . 这有什么不对吗？

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>

Error

E / AndroidRuntime：FATAL EXCEPTION：main进程：com.example.fyp_awais.tab，PID：3974 java.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文件行＃20：在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2387）的android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2325）中错误地膨胀类片段在android.app.ActivityThread.access $ 800（ActivityThread.java:151）android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1303）在android.os.Handler.dispatchMessage（Handler.java:102）在android位于android.app.ActivityThread.main（ActivityThread.java:5254）的.os.Looper.loop（Looper.java:135）位于java.lang.reflect.Method的java.lang.reflect.Method.invoke（Native Method） .invoke（Method.java:372）com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:903）at com.android.internal.os.ZygoteInit.main（ZygoteIni） t.java:698）由以下原因引起：android.view.InflateException：二进制XML文件行＃20：在android.view.LayoutInflater.rInflate（在android.view.LayoutInflater.createViewFromTag（LayoutInflater.java:763）中填充类片段时出错（ LayoutInflater.java:806）android.view.LayoutInflater.inflate（LayoutInflater.java:804）android.view.LayoutInflater.inflate（LayoutInflater.java：804）android.view.LayoutInflater.inflate（LayoutInflater.java:414））在Android.app.Activity.setContentView（Activity.java：）的com.android.internal.policy.impl.PhoneWindow.setContentView（PhoneWindow.java:378）的android.view.LayoutInflater.inflate（LayoutInflater.java:365）中 . 2145）在android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1106）的android.app.Activity.performCreate（Activity.java:5990）的com.example.fyp_awais.tab.MainActivity.onCreate（MainActivity.java:56））在android.app.ActivityThread.handleLaunchActivity（ActivityTh）的android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2278） read.java:2387）在Android.app.Handler.dispatchMessage（处理程序 . ）的android.app.ActivityThread.access $ 800（ActivityThread.java:151）android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1303） . java：102）在android.app.Looper.loop（Looper.java:135）的android.app.ActivityThread.main（ActivityThread.java:5254）java. java.lang.reflect.Method.invoke（Native Method）位于com.android.internal.os.ZygoteInit.main的com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:903）中的.lang.reflect.Method.invoke（Method.java:372）（ZygoteInit） .java：698）引起：java.lang.ClassLoader.findLoadedClass（ClassLoader.java:362）java.lang.ClassLoader.loadClass（ClassLoader）java.lang.VMClassLoader.findLoadedClass（Native Method）的java.lang.NullPointerException .java：499）在android.app.Fragment.instantiate（Fragment.java:582）的android.app.Fragment.instantiate（Fragment.java:604）的java.lang.ClassLoader.loadClass（ClassLoader.java:469）在android.app.FragmentManagerImpl.onCreateView（Fr agmentManager.java:2108）在android.view.LayoutInflater.rInflate（LayoutInflater.java:806）的android.view.LayoutInflater.createViewFromTag（LayoutInflater.java:733）的android.app.Activity.onCreateView（Activity.java:5328））android.view.LayoutInflater.inflate（LayoutInflater.java:504）的android.view.LayoutInflater.inflate（LayoutInflater.java:504）android.view.LayoutInflater.inflate（LayoutInflater.java:414）android.view .LayoutInflater.inflate（LayoutInflater.java:365）位于com.android.internal.policy.impl.PhoneWindow.setContentView（PhoneWindow.java:378），位于com的android.app.Activity.setContentView（Activity.java:2145） . 在Android.app的android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1106）的android.app.Activity.performCreate（Activity.java:5990）的example.fyp_awais.tab.MainActivity.onCreate（MainActivity.java:56） .ActivityThread.performLaunchActivity（ActivityThread.java:2278）在android.ap.ActivityThread.handleLaunchActivity（ActivityThread.java:2387）的android.ap上p.ActivityThread.access $ 800（ActivityThread.java:151）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1303）at atandroid.os.Handler.dispatchMessage（Handler.java:102）位于android.app.Looper.loop（Looper.java:135）的android.app.ActivityThread.main（ActivityThread.java:5254），位于java.lang.reflect com.android上com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:903）的java.lang.reflect.Method.invoke（Method.java:372）中的.Method.invoke（Native Method） .internal.os.ZygoteInit.main（ZygoteInit.java:698）申请已终止 .

2 回答

您确定在 landscape 模式下收到错误吗？因为在_1836369中它运行良好并且在 portrait 模式下你没有使用动态片段，所以你需要扩展 Fragment Activity 而不是Activity来运行片段 . 如果你使用动态片段代替硬编码会很好 .

将layout-port / main_activity更改为此

<?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>

//你的完整解决方案

Main Activity

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();

        }
    }
}

port:

<?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>

land:

<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>

回复于 2024-04-23T21:46:07+08:00

我认为错误发生在 <fragment> 的xml文件中

如果要在xml中使用fragment，则需要将该片段的类定义为

<fragment
        class="com.example.android.app.fragmentName"
        android:id="@+id/titles"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

否则定义片段内部代码并将xml中的FrameLayout设置为

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

回复于 2024-04-23T21:46:07+08:00

二进制XML文件行＃20：错误膨胀类片段Android

2 回答

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