<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal">
    
    <TabHost
        android:id="@+id/mytabhost"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentBottom="true" 
        android:background="@drawable/bg_keyboard">        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical" >            <TabWidget
                android:id="@android:id/tabs"
                android:layout_width="match_parent"
                android:layout_height="match_parent" >
            </TabWidget>            <FrameLayout
                android:id="@android:id/tabcontent"
                android:layout_width="match_parent"
                android:layout_height="match_parent" >                <RelativeLayout
                    android:id="@+id/tab1"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent" >
                    <include
                                                layout="@layout/layout_keyboard_engchars" 
                                                android:id="@+id/keyboard_eng_chars"/>
                </RelativeLayout>                <RelativeLayout
                    android:id="@+id/tab2"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent" >
                    <include
                        layout="@layout/layout_keyboard_greekchars"
                        android:id="@+id/keyboard_greek_chars"/>
                </RelativeLayout>                <RelativeLayout
                    android:id="@+id/tab3"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent" >
                    <include 
                        layout="@layout/layout_keyboard_operators"
                        android:id="@+id/keyboard_operators"/>
                </RelativeLayout>
                
                <RelativeLayout
                    android:id="@+id/tab4"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent" >
                    <include 
                        layout="@layout/layout_keyboard_funcs"
                        android:id="@+id/keyboard_funcs"/>
                </RelativeLayout>
            </FrameLayout>
        </LinearLayout>
    </TabHost>
</RelativeLayout>
上面就是是布局(一个Tab),帮忙看下问题在哪?