java - TabHost 未正确加载？

Question

我的 TabHost Activity 由于错误而无法正确加载。这是我的代码、xml 和错误日志:

public class TabScreen extends TabActivity {

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

    TabHost t = getTabHost();
    TabHost tabHost = (TabHost)findViewById(android.R.id.tabhost);


    //For New Photos
    TabSpec newSpec = tabHost.newTabSpec("NewPhoto");
    newSpec.setIndicator("NewPhoto", getResources().getDrawable(R.drawable.ic_tab_newphoto));
    Intent phNewIntent = new Intent(this, NewPhoto.class);
    newSpec.setContent(phNewIntent);
    //For List of Taken Photos
    TabSpec listSpec = tabHost.newTabSpec("PhotoList");
    listSpec.setIndicator("PhotoList", getResources().getDrawable(R.drawable.ic_tab_photolist));
    Intent phListIntent = new Intent(this, PhotoList.class);
    listSpec.setContent(phListIntent);
    //For Map
    TabSpec mapSpec = tabHost.newTabSpec("PhotoMap");
    mapSpec.setIndicator("PhotoMap", getResources().getDrawable(R.drawable.ic_tab_photomap));
    Intent phMapIntent = new Intent(this, PhotoMap.class);
    mapSpec.setContent(phMapIntent);

    tabHost.addTab(newSpec);
    tabHost.addTab(listSpec);
    tabHost.addTab(mapSpec);
}


}

还有我的 XML:

<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent">

<LinearLayout
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <TabWidget
        android:id="@android:id/tabs"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
    <FrameLayout
        android:id="@android:id/tabcontent"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"/>

</LinearLayout>

最后，我的错误消息:(有一个很长的列表，但我认为问题的主要是我正在粘贴的内容)

12-02 16:00:06.250: E/AndroidRuntime(3757): FATAL EXCEPTION: main
12-02 16:00:06.250: E/AndroidRuntime(3757): java.lang.RuntimeException: Unable to start         activity ComponentInfo{edu.wcu.snipsnaps/edu.wcu.snipsnaps.TabScreen}:     java.lang.RuntimeException: Unable to start activity     ComponentInfo{edu.wcu.snipsnaps/edu.wcu.snipsnaps.NewPhoto}: java.lang.RuntimeException:     Your content must have a TabHost whose id attribute is 'android.R.id.tabhost'

该网站上有多个关于此问题的条目，但在查看每个条目后，没有一个解决方案有效。我的 xml 具有正确的 @android:id/tabhost，我删除了 R.java 文件并多次清理了整个项目。如果这有帮助，当我进行一些调试时，应用程序崩溃的地方是 tabHost.addTab(newSpec); 。有人知道这是怎么回事吗？

编辑:完整错误日志:

12-02 17:02:43.296: E/AndroidRuntime(8121): java.lang.RuntimeException: Unable to start activity ComponentInfo{edu.wcu.snipsnaps/edu.wcu.snipsnaps.TabScreen}:     java.lang.RuntimeException: Your content must have a TabHost whose id attribute is     'android.R.id.tabhost'
12-02 17:02:43.296: E/AndroidRuntime(8121):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
12-02 17:02:43.296: E/AndroidRuntime(8121):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
12-02 17:02:43.296: E/AndroidRuntime(8121):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
12-02 17:02:43.296: E/AndroidRuntime(8121):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
12-02 17:02:43.296: E/AndroidRuntime(8121):     at android.os.Handler.dispatchMessage(Handler.java:99)
12-02 17:02:43.296: E/AndroidRuntime(8121):     at android.os.Looper.loop(Looper.java:130)
12-02 17:02:43.296: E/AndroidRuntime(8121):     at android.app.ActivityThread.main(ActivityThread.java:3687)
12-02 17:02:43.296: E/AndroidRuntime(8121):     at java.lang.reflect.Method.invokeNative(Native Method)
12-02 17:02:43.296: E/AndroidRuntime(8121):     at java.lang.reflect.Method.invoke(Method.java:507)
12-02 17:02:43.296: E/AndroidRuntime(8121):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
12-02 17:02:43.296: E/AndroidRuntime(8121):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
12-02 17:02:43.296: E/AndroidRuntime(8121):     at dalvik.system.NativeStart.main(Native Method)
12-02 17:02:43.296: E/AndroidRuntime(8121): Caused by: java.lang.RuntimeException: Your content must have a TabHost whose id attribute is 'android.R.id.tabhost'
12-02 17:02:43.296: E/AndroidRuntime(8121):     at android.app.TabActivity.onContentChanged(TabActivity.java:105)
12-02 17:02:43.296: E/AndroidRuntime(8121):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:212)
12-02 17:02:43.296: E/AndroidRuntime(8121):     at android.app.Activity.setContentView(Activity.java:1657)
12-02 17:02:43.296: E/AndroidRuntime(8121):     at edu.wcu.snipsnaps.TabScreen.onCreate(TabScreen.java:16)
12-02 17:02:43.296: E/AndroidRuntime(8121):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
12-02 17:02:43.296: E/AndroidRuntime(8121):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
12-02 17:02:43.296: E/AndroidRuntime(8121):     ... 11 more

Answer 1

在代码中尝试一下

TabHost tabHost = (TabHost)findViewById(R.id.tabhost);

而不是:

TabHost tabHost = (TabHost)findViewById(android.R.id.tabhost);

在 XML 中:

<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent">

而不是

<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent">

还有可能您需要将 View 中的所有 id 从 android:id="@android:id...."更改为 android:id="@+id/....."， @android 为 android 默认保留元素

帮助链接http://www.androidhive.info/2011/08/android-tab-layout-tutorial/