31

我只是想看看 Fragment 并且我得到了一些愚蠢的东西......有我的 SkippersActivity.java ：

public class SkippersActivity extends Activity{
 public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
    setContentView(R.layout.skippers_fragment);
 }
}

还有我的 skippers_fragment.xml ：

 <?xml version="1.0" encoding="utf-8"?>
    <fragment
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:name="com.arkezis.globedroid.SkippersFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/skippers_fragment">
    </fragment>

还有我的 SkippersFragment.xml ：

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

}

我的skippers.xml：

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

为什么我得到：

04-30 13:45:16.355: E/AndroidRuntime(30077): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.arkezis.globedroid/com.arkezis.globedroid.SkippersActivity}: android.view.InflateException: Binary XML file line #2: Error inflating class fragment
04-30 13:45:16.355: E/AndroidRuntime(30077):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at android.app.ActivityThread.access$600(ActivityThread.java:123)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at android.os.Handler.dispatchMessage(Handler.java:99)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at android.os.Looper.loop(Looper.java:137)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at android.app.ActivityThread.main(ActivityThread.java:4424)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at java.lang.reflect.Method.invokeNative(Native Method)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at java.lang.reflect.Method.invoke(Method.java:511)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at dalvik.system.NativeStart.main(Native Method)
04-30 13:45:16.355: E/AndroidRuntime(30077): Caused by: android.view.InflateException: Binary XML file line #2: Error inflating class fragment
04-30 13:45:16.355: E/AndroidRuntime(30077):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:697)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at android.view.LayoutInflater.inflate(LayoutInflater.java:466)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:251)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at android.app.Activity.setContentView(Activity.java:1835)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at com.arkezis.globedroid.SkippersActivity.onCreate(SkippersActivity.java:19)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at android.app.Activity.performCreate(Activity.java:4465)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
04-30 13:45:16.355: E/AndroidRuntime(30077):    ... 11 more
04-30 13:45:16.355: E/AndroidRuntime(30077): Caused by: java.lang.ClassCastException: com.arkezis.globedroid.SkippersFragment cannot be cast to android.app.Fragment
04-30 13:45:16.355: E/AndroidRuntime(30077):    at android.app.Fragment.instantiate(Fragment.java:574)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at android.app.Fragment.instantiate(Fragment.java:549)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at android.app.Activity.onCreateView(Activity.java:4235)
04-30 13:45:16.355: E/AndroidRuntime(30077):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:673)
4

4 回答 4

101

如果我不得不猜测，SkippersFragment正在扩展android.support.v4.app.Fragment. 但是，SkippersActivity不是扩展。尝试使用本机 API 级别 11 片段也是如此。android.support.v4.app.FragmentActivitySkippersActivity

于 2012-04-30T12:57:58.687 回答
19

如果您使用 v4 兼容包，您的 Activity 必须扩展 FragmentActivity，而不是 Activity。如果您使用 Android > 3.0，那么您的 Activity 会扩展 Activity，但请阅读 CommonsWare 关于不混合两种类型的片段的答案。

于 2012-06-13T02:02:55.177 回答
2

另一个需要注意的陷阱是确保不要忘记从活动中调用 super.onCreate()。如果你像我一样犯了这个愚蠢的错误，即使你没有不匹配标准和支持，你也会看到“Error inflating class fragment”和“... cannot be cast to android.app.Fragment”错误.v4 版本的类。

于 2014-03-21T20:15:41.370 回答
0

我在尝试扩展 ListFragment 时遇到了同样的错误。我的发现是，要在 minSdkVersion < 11 的项目上使用 ListFragment，我必须import android.support.v4.app.ListFragment;. 否则，我将不得不import android.app.ListFragment;。

这个链接澄清了我的问题。

于 2013-11-14T19:05:53.123 回答