Android

Question

在我的应用程序中，我必须从登录名 activity（使用 RelativeLayout 开发的正常 activity）导航到包含 Tab Host 的 activity。我为 Tab Host 创建了以下 xml：

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

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/linearLayout1"
        android:orientation="vertical">

        <TabWidget
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@android:id/tabs"
            android:layout_marginBottom="-4dp">
        </TabWidget>

        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@android:id/tabcontent"
            android:layout_weight="1">
        </FrameLayout>

        </LinearLayout>

</TabHost>

这是控制标签主机的 class 的代码：

public class TabBarActivity extends TabActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_tabbar);

        TabHost tabHost = getTabHost();
        TabHost.TabSpec spec;
        Intent intent;

        intent = new Intent().setClass(this, HomeActivity.class);
        spec = tabHost.newTabSpec("Home").setIndicator("", getResources().getDrawable(R.drawable.home)).setContent(intent);
        tabHost.addTab(spec);

        intent = new Intent().setClass(this, HistoryActivity.class);
        spec = tabHost.newTabSpec("History").setIndicator("", getResources().getDrawable(R.drawable.bell)).setContent(intent);
        tabHost.addTab(spec);

        intent = new Intent().setClass(this, SettingsActivity.class);
        spec = tabHost.newTabSpec("Settings").setIndicator("", getResources().getDrawable(R.drawable.gear)).setContent(intent);
        tabHost.addTab(spec);
    }
}

我的登录 activity 将用户名和密码发送到 Web 服务，如果 Web 服务允许用户登录，它应该在底部显示带有 3 个不同 activity 的选项卡主机。如何使用 Tab Host 显示 activity？我试过这样做：

Intent i = new Intent(MainActivity.this, TabBarActivity.class);
startActivity(i);

但是它崩溃了。你能帮帮我吗？

更新

02-26 15:16:27.533    5504-5504/com.sample.app E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.sample.app, PID: 5504
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.sample.app/com.sample.app.TabBarActivity}: java.lang.RuntimeException: Your content must have a TabHost whose id attribute is 'android.R.id.tabhost'
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2305)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2363)
            at android.app.ActivityThread.access0(ActivityThread.java:161)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1265)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:157)
            at android.app.ActivityThread.main(ActivityThread.java:5356)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.RuntimeException: Your content must have a TabHost whose id attribute is 'android.R.id.tabhost'
            at android.app.TabActivity.onContentChanged(TabActivity.java:131)
            at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:362)
            at android.app.Activity.setContentView(Activity.java:2010)
            at armandotesta.it.atbrain.TabBarActivity.onCreate(TabBarActivity.java:15)
            at android.app.Activity.performCreate(Activity.java:5426)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2269)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2363)
            at android.app.ActivityThread.access0(ActivityThread.java:161)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1265)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:157)
            at android.app.ActivityThread.main(ActivityThread.java:5356)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
            at dalvik.system.NativeStart.main(Native Method)

Answer 1

替换

TabHost tabHost = getTabHost();

和

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

Answer 2

您是否尝试过将 android:id="@android:id/tabhost" 添加到您的 TabHost

<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/tabhost"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

顺便说一句：TabHost 似乎已被弃用，您应该改用 Fragments。

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