android - InflateException 错误膨胀类 fragment

Question

启动具有 fragment 的 Activity 时，我不断收到该错误。

这是我的代码的概述:

主页 Activity 从启动 屏幕 Activity 开始

home.xml(每个 fragment 有50%的layout_weight)

<LinearLayout>
    <fragment android:name="com.example.test.FragmentClass1" ...>
    <fragment android:name="com.example.test.FragmentClass2" ...>
</LinearLayout>

fragment1.xml

<LinearLayout>
    //some EditTexts and Buttons here
<LinearLayout>

fragment2.xml

<LinearLayout>
    <ListView ... />
</LinearLayout>

FragmentClass1.java

public class FragmentClass1 extends Fragment{
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
        View view = inflater.inflate(R.layout.fragment1, container, false);
        return view;
    }
}

FragmentClass2.java

public class FragmentClass2 extends ListFragment{
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
        View view = inflater.inflate(R.layout.fragment2, container, false);
        return view;
    }
}

Home.java

public class Home extends Activity{
    public View onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.home);
        //still empty
    }
}

错误日志是这样的:

12-09 20:39:00.317: E/AndroidRuntime(18214): FATAL EXCEPTION: main
12-09 20:39:00.317: E/AndroidRuntime(18214): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.test/com.example.test.Home}: android.view.InflateException: Binary XML file line #10: Error inflating class fragment
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.ActivityThread.access$600(ActivityThread.java:141)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.os.Handler.dispatchMessage(Handler.java:99)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.os.Looper.loop(Looper.java:137)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.ActivityThread.main(ActivityThread.java:5039)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at java.lang.reflect.Method.invokeNative(Native Method)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at java.lang.reflect.Method.invoke(Method.java:511)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at dalvik.system.NativeStart.main(Native Method)
12-09 20:39:00.317: E/AndroidRuntime(18214): Caused by: android.view.InflateException: Binary XML file line #10: Error inflating class fragment
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:270)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.Activity.setContentView(Activity.java:1881)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at com.example.test.Home.onCreate(Home.java:16)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.Activity.performCreate(Activity.java:5104)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
12-09 20:39:00.317: E/AndroidRuntime(18214):    ... 11 more
12-09 20:39:00.317: E/AndroidRuntime(18214): Caused by: java.lang.ClassCastException: com.example.test.Fragment1 cannot be cast to android.app.Fragment
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.Fragment.instantiate(Fragment.java:585)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.Fragment.instantiate(Fragment.java:560)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.app.Activity.onCreateView(Activity.java:4709)
12-09 20:39:00.317: E/AndroidRuntime(18214):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:680)
12-09 20:39:00.317: E/AndroidRuntime(18214):    ... 21 more

有什么解决办法吗？谢谢

Answer 1

如果您尝试使用 Android 支持包的 fragment 反向移植，您需要让您的 Activity 继承自 FragmentActivity(或从继承自 FragmentActivity 的其他东西，像 SherlockFragmentActivity)。

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更新

堆栈跟踪中的关键行是:

12-09 20:39:00.317: E/AndroidRuntime(18214): Caused by: java.lang.ClassCastException: com.example.test.Fragment1 cannot be cast to android.app.Fragment

现在，您提供的源代码中没有任何名为 com.example.test.Fragment1 的内容。如果这确实是您作为 com.example.test.FragmentClass1 列出的内容，那么您继承的 Fragment 可能不是 android.app。 fragment 。在这种情况下，最有可能的是 android.support.v4.app.Fragment —— backport 中的 Fragment 类。如果是这种情况，请更改导入语句(以及代码库其余部分中的任何其他有缺陷的语句)。