android 自定義TabActivity的實例方法

一、改變Tab欄的位置。
java代碼。在TabActivity的oncreate方法中添加
setContentView(R.layout.tab_host);

其中 Layout tab_host.xml 是從系統資源文件中摳出來之後略作修改。
系統原來的 tab_host.xml內容如下

復制代碼 代碼如下:
<?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>

要實現TAB欄在頁面下方，只需簡單修改。
復制代碼 代碼如下:
<?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>

這樣，就實現了ＴＡＢ欄在頁面下冊。需要注意的是，view的id不要修改。

二、自定義TAB的圖片。系統自帶的tab_indicator.xml內容如下

復制代碼 代碼如下:
<?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"
       
    />

</RelativeLayout>

可以看出，默認情況下，圖標在文字上方，並且不能占到整個格，無法滿足設計需要。因此可以重寫該Layout。
編寫tab_in.xml

復制代碼 代碼如下:
<?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)
             );