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我正在关注这个Google 演示，当我包含片段视图时，我的应用程序失败了。eclipse 模拟器会生成一个对话框，说明应用程序意外关闭。

该代码根本没有任何意义，也不是问题，因为当我在没有 activity_main.xml 中的片段的情况下运行它时，它工作正常。

代码：

导入android.app.Activity；导入android.os.Bundle；

公共类 MainActivity 扩展 Activity {

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

}

我无法复制 xml，但它是默认的空白“activity_main”xml 文件（带有 RelativeLayout 根），其中在 RelativeLayout 父级内部添加了片段，与演示中完全相同，只是没有重新复制的 xml 版本标记（这与已经存在的相同）。

当我删除片段时，它运行良好。

我在做什么使片段类​​无法使用？

更新：这里是 logcat

04-25 01:35:42.202: D/AndroidRuntime(441): Shutting down VM

04-25 01:35:42.202: W/dalvikvm(441): threadid=1: thread exiting with uncaught exception (group=0x40015560)

04-25 01:35:42.221: E/AndroidRuntime(441): FATAL EXCEPTION: main

04-25 01:35:42.221: E/AndroidRuntime(441): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.sikkemamap/com.example.sikkemamap.MainActivity}: android.view.InflateException: Binary XML file line #7: Error inflating class fragment

04-25 01:35:42.221: E/AndroidRuntime(441):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)

04-25 01:35:42.221: E/AndroidRuntime(441):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)

04-25 01:35:42.221: E/AndroidRuntime(441):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)

04-25 01:35:42.221: E/AndroidRuntime(441):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)

04-25 01:35:42.221: E/AndroidRuntime(441):  at android.os.Handler.dispatchMessage(Handler.java:99)

04-25 01:35:42.221: E/AndroidRuntime(441):  at android.os.Looper.loop(Looper.java:123)

04-25 01:35:42.221: E/AndroidRuntime(441):  at android.app.ActivityThread.main(ActivityThread.java:3683)

04-25 01:35:42.221: E/AndroidRuntime(441):  at java.lang.reflect.Method.invokeNative(Native Method)

04-25 01:35:42.221: E/AndroidRuntime(441):  at java.lang.reflect.Method.invoke(Method.java:507)

04-25 01:35:42.221: E/AndroidRuntime(441):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)

04-25 01:35:42.221: E/AndroidRuntime(441):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)

04-25 01:35:42.221: E/AndroidRuntime(441):  at dalvik.system.NativeStart.main(Native Method)

04-25 01:35:42.221: E/AndroidRuntime(441): Caused by: android.view.InflateException: Binary XML file line #7: Error inflating class fragment

04-25 01:35:42.221: E/AndroidRuntime(441):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:581)

04-25 01:35:42.221: E/AndroidRuntime(441):  at android.view.LayoutInflater.rInflate(LayoutInflater.java:623)

04-25 01:35:42.221: E/AndroidRuntime(441):  at android.view.LayoutInflater.inflate(LayoutInflater.java:408)

04-25 01:35:42.221: E/AndroidRuntime(441):  at android.view.LayoutInflater.inflate(LayoutInflater.java:320)

04-25 01:35:42.221: E/AndroidRuntime(441):  at android.view.LayoutInflater.inflate(LayoutInflater.java:276)

04-25 01:35:42.221: E/AndroidRuntime(441):  at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:207)

04-25 01:35:42.221: E/AndroidRuntime(441):  at android.app.Activity.setContentView(Activity.java:1657)

04-25 01:35:42.221: E/AndroidRuntime(441):  at com.example.sikkemamap.MainActivity.onCreate(MainActivity.java:11)

04-25 01:35:42.221: E/AndroidRuntime(441):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)

04-25 01:35:42.221: E/AndroidRuntime(441):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)

04-25 01:35:42.221: E/AndroidRuntime(441):  ... 11 more

04-25 01:35:42.221: E/AndroidRuntime(441): Caused by: java.lang.ClassNotFoundException: android.view.fragment in loader dalvik.system.PathClassLoader[/data/app/com.example.sikkemamap-2.apk]

04-25 01:35:42.221: E/AndroidRuntime(441):  at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)

04-25 01:35:42.221: E/AndroidRuntime(441):  at java.lang.ClassLoader.loadClass(ClassLoader.java:551)

04-25 01:35:42.221: E/AndroidRuntime(441):  at java.lang.ClassLoader.loadClass(ClassLoader.java:511)

04-25 01:35:42.221: E/AndroidRuntime(441):  at android.view.LayoutInflater.createView(LayoutInflater.java:471)

04-25 01:35:42.221: E/AndroidRuntime(441):  at android.view.LayoutInflater.onCreateView(LayoutInflater.java:549)

04-25 01:35:42.221: E/AndroidRuntime(441):  at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:66)

04-25 01:35:42.221: E/AndroidRuntime(441):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:568)

04-25 01:35:42.221: E/AndroidRuntime(441):  ... 20 more

04-25 01:35:55.342: I/Process(441): Sending signal. PID: 441 SIG: 9
4

1 回答 1

3

You're extending Activity while targeting a pre-Honycomb (API level 11) device. For use of fragments on Gingerbread (API level 10) and lower you should be extending FragmentActvity instead.

Note: FragmentActivity is part of the Android Support Package, so make sure you have it imported in your project.

于 2013-04-25T05:32:56.223 回答