安卓系统中的tabhost示例强制关闭模拟器

Question

我写了一个简单的tabhost示例，如下

<?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" >
    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >
        <TabWidget
            android:id="@android:id/tabs"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" >
        </TabWidget>
        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent" >
            <LinearLayout
                android:id="@+id/tab1"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent" >
                <Button
                    android:id="@+id/button1"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Button" />
                <Button
                    android:id="@+id/button2"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Button" />
                <TextView
                    android:id="@+id/textView1"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Large Text"
                    android:textAppearance="?android:attr/textAppearanceLarge" />
            </LinearLayout>
            <LinearLayout
                android:id="@+id/tab2"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent" >
                <Button
                    android:id="@+id/button3"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Button" />
            </LinearLayout>
            <LinearLayout
                android:id="@+id/tab3"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent" >
                <TextView
                    android:id="@+id/tv2"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Large Text"
                    android:textAppearance="?android:attr/textAppearanceLarge" />
            </LinearLayout>
        </FrameLayout>
    </LinearLayout>
</TabHost>

这在main.xml中所以我将setcontentview设置为main.xml

public class AndroidtabhostActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
}

它在android 4.0模拟器中运行良好，但当我在android 2.1模拟器上运行它时，它会强制关闭ddms 中的这些日志

03-16 17:19:08.295: E/AndroidRuntime(1579):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1819)
03-16 17:39:27.016: E/AndroidRuntime(2092): Uncaught handler: thread main exiting due to uncaught exception
03-16 17:39:27.036: E/AndroidRuntime(2092): java.lang.RuntimeException: Unable to start activity ComponentInfo{banana.com/banana.com.AndroidtabhostActivity}: java.lang.RuntimeException: Your content must have a TabHost whose id attribute is 'android.R.id.tabhost'
03-16 17:39:27.036: E/AndroidRuntime(2092):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
03-16 17:39:27.036: E/AndroidRuntime(2092):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
03-16 17:39:27.036: E/AndroidRuntime(2092):     at android.app.ActivityThread.access$2200(ActivityThread.java:119)
03-16 17:39:27.036: E/AndroidRuntime(2092):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
03-16 17:39:27.036: E/AndroidRuntime(2092):     at android.os.Handler.dispatchMessage(Handler.java:99)
03-16 17:39:27.036: E/AndroidRuntime(2092):     at android.os.Looper.loop(Looper.java:123)
03-16 17:39:27.036: E/AndroidRuntime(2092):     at android.app.ActivityThread.main(ActivityThread.java:4363)
03-16 17:39:27.036: E/AndroidRuntime(2092):     at java.lang.reflect.Method.invokeNative(Native Method)
03-16 17:39:27.036: E/AndroidRuntime(2092):     at java.lang.reflect.Method.invoke(Method.java:521)
03-16 17:39:27.036: E/AndroidRuntime(2092):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
03-16 17:39:27.036: E/AndroidRuntime(2092):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
03-16 17:39:27.036: E/AndroidRuntime(2092):     at dalvik.system.NativeStart.main(Native Method)
03-16 17:39:27.036: E/AndroidRuntime(2092): Caused by: java.lang.RuntimeException: Your content must have a TabHost whose id attribute is 'android.R.id.tabhost'
03-16 17:39:27.036: E/AndroidRuntime(2092):     at android.app.TabActivity.onContentChanged(TabActivity.java:105)
03-16 17:39:27.036: E/AndroidRuntime(2092):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:201)
03-16 17:39:27.036: E/AndroidRuntime(2092):     at android.app.Activity.setContentView(Activity.java:1622)
03-16 17:39:27.036: E/AndroidRuntime(2092):     at banana.com.AndroidtabhostActivity.onCreate(AndroidtabhostActivity.java:11)
03-16 17:39:27.036: E/AndroidRuntime(2092):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-16 17:39:27.036: E/AndroidRuntime(2092):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
03-16 17:39:27.036: E/AndroidRuntime(2092):     ... 11 more

为什么会这样？？？有人能解释一下吗

按照samir所说的改变后，我仍然得到一个异常

03-16 17:50:03.925: E/AndroidRuntime(2372): Uncaught handler: thread main exiting due to uncaught exception
03-16 17:50:03.936: E/AndroidRuntime(2372): java.lang.NullPointerException
03-16 17:50:03.936: E/AndroidRuntime(2372):     at android.widget.TabHost.dispatchWindowFocusChanged(TabHost.java:295)
03-16 17:50:03.936: E/AndroidRuntime(2372):     at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:661)
03-16 17:50:03.936: E/AndroidRuntime(2372):     at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:661)
03-16 17:50:03.936: E/AndroidRuntime(2372):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1819)
03-16 17:50:03.936: E/AndroidRuntime(2372):     at android.os.Handler.dispatchMessage(Handler.java:99)
03-16 17:50:03.936: E/AndroidRuntime(2372):     at android.os.Looper.loop(Looper.java:123)
03-16 17:50:03.936: E/AndroidRuntime(2372):     at android.app.ActivityThread.main(ActivityThread.java:4363)
03-16 17:50:03.936: E/AndroidRuntime(2372):     at java.lang.reflect.Method.invokeNative(Native Method)
03-16 17:50:03.936: E/AndroidRuntime(2372):     at java.lang.reflect.Method.invoke(Method.java:521)
03-16 17:50:03.936: E/AndroidRuntime(2372):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
03-16 17:50:03.936: E/AndroidRuntime(2372):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
03-16 17:50:03.936: E/AndroidRuntime(2372):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

Android的Tabhost有缺陷。请查看我的博客了解更多信息以创建标签

搜索tabhost可以立即获得相应的信息。

Answer 2

我必须至少设置一个选项卡，否则它会在2.1中出现错误，而4.0则会处理它，所以我在设置contentview 后添加了此代码

TabHost th = (TabHost) findViewById(R.id.mytabhost);
    th.setup();
    TabSpec ts = th.newTabSpec("whatevver");
    ts.setContent(R.id.tab1);
    ts.setIndicator("TAB1");
    th.addTab(ts); 

它在两个模拟器中都运行良好。