android customizes the instance methods of TabActivity

1. Change the position of the Tab column.
java code. Add in the oncreate method of TabActivity
setContentView(R.layout.tab_host);

Among them, Layout tab_host.xml was slightly modified after it was extracted from the system resource file.
The system's original tab_host.xml is as follows

<?xml version="1.0" encoding="utf-8"?>
<!--
/* //device/apps/common/assets/res/layout/tab_content.xml
**
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License"); 
** you may not use this file except in compliance with the License. 
** You may obtain a copy of the License at 
**
**     http://www.apache.org/licenses/LICENSE-2.0 
**
** Unless required by applicable law or agreed to in writing, software 
** distributed under the License is distributed on an "AS IS" BASIS, 
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
** See the License for the specific language governing permissions and 
** limitations under the License.
*/
-->
<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:orientation="vertical"
        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_weight="0" />
        <FrameLayout android:id="@android:id/tabcontent"
            android:layout_width="match_parent" android:layout_height="0dip"
            android:layout_weight="1"/>
    </LinearLayout>
</TabHost>

To implement the TAB bar at the bottom of the page, simply modify it.

<?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="fill_parent" android:layout_height="fill_parent">
        <LinearLayout android:orientation="vertical"
        android:layout_width="fill_parent" android:layout_height="fill_parent">
                 <FrameLayout android:id="@android:id/tabcontent"
                 android:layout_width="fill_parent" android:layout_height="0dip"
            android:layout_weight="1"/>
       <TabWidget android:id="@android:id/tabs" android:layout_width="fill_parent"
                android:layout_height="wrap_content" android:layout_weight="0" />
         </LinearLayout>
 </TabHost>

In this way, the realization of the TAB bar in the page next volume. Note that view's id should not be modified.

2. Customize TAB images. The built-in tab_indicator.xml is as follows

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2008 The Android Open Source Project
     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at

          http://www.apache.org/licenses/LICENSE-2.0

     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
-->
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="0dip"
    android:layout_height="64dip"
    android:layout_weight="1"
    android:layout_marginLeft="-3dip"
    android:layout_marginRight="-3dip"
    android:orientation="vertical"
    android:background="@android:drawable/tab_indicator">
    <ImageView android:id="@+id/icon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
    />
    <TextView android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        style="?android:attr/tabWidgetStyle"
    />
</RelativeLayout>

As you can see, by default, the icon is above the text and does not take up the whole space, which does not meet the design needs. So you can rewrite this Layout.
Write tab_in xml

<?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="64dip"
     android:orientation="vertical"
     >
</RelativeLayout>

View view1 = inflater.inflate(R.layout.tab_in, null);;
        View view2 = inflater.inflate(R.layout.tab_in, null);;
        View view3 = inflater.inflate(R.layout.tab_in, null);;

        

        view1 .setBackgroundResource(R.drawable.record_upload_button_stateful);
        view2 .setBackgroundResource(R.drawable.record_download_button_stateful);
        view3 .setBackgroundResource(R.drawable.record_receive_button_stateful);
tabHost.addTab(tabHost
                .newTabSpec("view1")
                .setIndicator(view1)              
          );
        tabHost.addTab(tabHost
                .newTabSpec("view2")
                .setIndicator(view2)
        );
       
        tabHost.addTab(tabHost
                .newTabSpec("view3")
                .setIndicator(view3)
             );