Question

我的斗智斗勇！我想在我的活动中添加一个片段。我已经阅读了大量有关此错误的Stackoverflow文章，但我看到的解决方案（扩展FragmentActivity，导入android.support.v4等等）都没有为我修复过。

这是我看到的错误：

02-21 13:59:52.063: E/AndroidRuntime(2165): FATAL EXCEPTION: main
02-21 13:59:52.063: E/AndroidRuntime(2165): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myfirstapp/net.myd.app.custom.MyActivity}: android.view.InflateException: Binary XML file line #57: Error inflating class Fragment
02-21 13:59:52.063: E/AndroidRuntime(2165):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at android.app.ActivityThread.access$600(ActivityThread.java:130)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at android.os.Handler.dispatchMessage(Handler.java:99)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at android.os.Looper.loop(Looper.java:137)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at android.app.ActivityThread.main(ActivityThread.java:4745)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at java.lang.reflect.Method.invokeNative(Native Method)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at java.lang.reflect.Method.invoke(Method.java:511)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at dalvik.system.NativeStart.main(Native Method)
02-21 13:59:52.063: E/AndroidRuntime(2165): Caused by: android.view.InflateException: Binary XML file line #57: Error inflating class Fragment
02-21 13:59:52.063: E/AndroidRuntime(2165):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:698)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:749)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:256)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at android.app.Activity.setContentView(Activity.java:1867)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at net.myd.app.custom.MyActivity.onCreate(MyActivity.java:46)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at android.app.Activity.performCreate(Activity.java:5008)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
02-21 13:59:52.063: E/AndroidRuntime(2165):     ... 11 more
02-21 13:59:52.063: E/AndroidRuntime(2165): Caused by: java.lang.ClassNotFoundException: android.view.Fragment
02-21 13:59:52.063: E/AndroidRuntime(2165):     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at android.view.LayoutInflater.createView(LayoutInflater.java:552)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at android.view.LayoutInflater.onCreateView(LayoutInflater.java:643)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:66)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at android.view.LayoutInflater.onCreateView(LayoutInflater.java:660)
02-21 13:59:52.063: E/AndroidRuntime(2165):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:685)
02-21 13:59:52.063: E/AndroidRuntime(2165):     ... 22 more

这是我正在使用的片段类：

package net.myd.app.custom;

import com.example.myfirstapp.R;

import android.annotation.TargetApi;
import android.app.Fragment;

import android.app.Fragment;
import android.os.Build;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public class MyFragment extends Fragment 
{   
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 
    {
        // Inflate the layout for this fragment 
        return inflater.inflate(R.layout.my_custom_fragment, container, false);
    }
}

这是我正在使用的活动：

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public class MyActivity extends FragmentActivity 
{
    // ... class fields

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

        selectFragment();
    }

    public void selectFragment()
    {
         Fragment fragment = new MyFragment();

         FragmentManager fm = getFragmentManager();
         FragmentTransaction fragmentTransaction = fm.beginTransaction();
         fragmentTransaction.replace(R.id.my_fragment, fragment);
         fragmentTransaction.commit();
    }

    // etc...
}

在我的活动的xml中，这就是我引用片段的方式：

（有一篇stackoverflow文章，它建议在片段xml代码中添加完整的类路径，我试过这个，但也没有用。）

 <Fragment
            android:id="@+id/my_fragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

如果有人能看到导致此错误的任何问题，我会非常感激！

由于

Answer 1

替换：

<Fragment
            android:id="@+id/my_fragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

有类似的东西：

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

Answer 2

使用FrameLayout可以解决问题。

  <FrameLayout
    android:id="@+id/my_fragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:ignore="MergeRootFrame" />

Android活动错误 - 错误膨胀类Fragment

2 个答案: