下方显示android.support.v4.app.FragmentTabHost使用总结

最新推荐文章于 2023-04-24 16:34:20 发布

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本文总结了在Android应用中使用`android.support.v4.app.FragmentTabHost`的实践经验，包括遇到的问题及解决方案。在旧版本ADT中使用FragmentTabHost时可能遇到的布局问题，以及如何通过调整布局来避免此类错误。

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以前在ADT使用到FragmentTabHost时的布局如下

<?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" >

    <FrameLayout
        android:id="@+id/realtabcontent"
        android:layout_width="match_parent"
        android:layout_height="0dip"
        android:layout_weight="1" />

    <android.support.v4.app.FragmentTabHost
        android:id="@android:id/tabhost"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/bottom_bg" >

        <TabWidget
            android:id="@android:id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#000000"
            android:orientation="horizontal" />
    </android.support.v4.app.FragmentTabHost>

</LinearLayout>

没有报错，但最近在ADT：v22.6.2-1085508上新建一个工程使用上述方法报：

08-31 14:27:36.281: D/AndroidRuntime(12052): Shutting down VM
08-31 14:27:36.281: W/dalvikvm(12052): threadid=1: thread exiting with uncaught exception (group=0x41c1b960)
08-31 14:27:36.289: E/AndroidRuntime(12052): FATAL EXCEPTION: main
08-31 14:27:36.289: E/AndroidRuntime(12052): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.ayome.testdemo/com.ayome.testdemo.MainActivity}: java.lang.RuntimeException: Your TabHost must have a FrameLayout whose id attribute is 'android.R.id.tabcontent'
08-31 14:27:36.289: E/AndroidRuntime(12052):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
08-31 14:27:36.289: E/AndroidRuntime(12052):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
08-31 14:27:36.289: E/AndroidRuntime(12052):  at android.app.ActivityThread.access$600(ActivityThread.java:141)
08-31 14:27:36.289: E/AndroidRuntime(12052):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
08-31 14:27:36.289: E/AndroidRuntime(12052):  at android.os.Handler.dispatchMessage(Handler.java:99)
08-31 14:27:36.289: E/AndroidRuntime(12052):  at android.os.Looper.loop(Looper.java:137)
08-31 14:27:36.289: E/AndroidRuntime(12052):  at android.app.ActivityThread.main(ActivityThread.java:5046)
08-31 14:27:36.289: E/AndroidRuntime(12052):  at java.lang.reflect.Method.invokeNative(Native Method)
08-31 14:27:36.289: E/AndroidRuntime(12052):  at java.lang.reflect.Method.invoke(Method.java:511)
08-31 14:27:36.289: E/AndroidRuntime(12052):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
08-31 14:27:36.289: E/AndroidRuntime(12052):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
08-31 14:27:36.289: E/AndroidRuntime(12052):  at dalvik.system.NativeStart.main(Native Method)
08-31 14:27:36.289: E/AndroidRuntime(12052): Caused by: java.lang.RuntimeException: Your TabHost must have a FrameLayout whose id attribute is 'android.R.id.tabcontent'
08-31 14:27:36.289: E/AndroidRuntime(12052):  at android.widget.TabHost.setup(TabHost.java:163)
08-31 14:27:36.289: E/AndroidRuntime(12052):  at android.support.v4.app.FragmentTabHost.setup(FragmentTabHost.java:197)
08-31 14:27:36.289: E/AndroidRuntime(12052):  at com.ayome.testdemo.MainActivity.onCreate(MainActivity.java:24)
08-31 14:27:36.289: E/AndroidRuntime(12052):  at android.app.Activity.performCreate(Activity.java:5104)
08-31 14:27:36.289: E/AndroidRuntime(12052):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
08-31 14:27:36.289: E/AndroidRuntime(12052):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
08-31 14:27:36.289: E/AndroidRuntime(12052):  ... 11 more

根据提示Your TabHost must have a FrameLayout whose id attribute is 'android.R.id.tabcontent'，就是要在TabHost上添加一个FrameLayout的布局且id为：android.R.id.tabcontent

后来使用这种布局，不会报错

<?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" >

    <android.support.v4.app.FragmentTabHost
        android:id="@android:id/tabhost"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

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

        <TabWidget
            android:id="@android:id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_gravity="bottom"
            android:background="#B0C4DE"
            android:orientation="horizontal"
            android:showDividers="middle" />
    </android.support.v4.app.FragmentTabHost>

</LinearLayout>

但有一个问题：如果你的Fragment是一个全屏显示的控件或是ListView，或是Map，下方的Tab就会挡住底下（前提是你的Tab放在下方）的显示，后来在网上找到一种较好的方法

<?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" >

    <FrameLayout
        android:id="@+id/realtabcontent"
        android:layout_width="match_parent"
        android:layout_height="0dip"
        android:layout_weight="1" />

    <android.support.v4.app.FragmentTabHost
        android:id="@android:id/tabhost"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/bottom_bg" >
    </android.support.v4.app.FragmentTabHost>

</LinearLayout>

在初始化时就要注意了mTabHost.setup的id
mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);
或
mTabHost.setup(this, getSupportFragmentManager(), android.R.id.abcontent);
要看你布局中定义的是哪个id