关于android的id

当引用Android的资源ID（非本地资源ID）时，必须机上android包名，使用TabHost控件时就要如此操作：

When referencing an Android resource ID, you do not need the plus-symbol, but must add the android package namespace, like so:

引用 android:id="@android:id/empty"

With the android package namespace in place, we're now referencing an ID from the android.R resources class, rather than the local resources class.

TabHost的xml布局

<?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="match_parent"    android:layout_height="match_parent" >    <LinearLayout        android:layout_width="match_parent"        android:layout_height="match_parent"        android:orientation="vertical"        android:padding="5dp" >        <TabWidget            android:id="@android:id/tabs"            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"            android:padding="5dp" />    </LinearLayout></TabHost>

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