Android美化TabWidget详细代码

android默认的tabwidget是置顶的，有时放在下面比较好看，但是使用默认的tabwidget放在下面看上去效果非常不好看，由此对其美化一下。设置其背景，以及选中的tab和未被选中的tab差异化，同时去掉了烦人了白线，同时对被选中和未被选中的标签进行区别，效果还可以。看代码。

预先准备好几个资源文件，然后在extends TabActivity的那个class中加进这个函数，找个地方调用它，就OK了。

//记得先定义这几个变量
private TabHost tabHost;
private TabWidget tabWidget;
Field mBottomLeftStrip;
Field mBottomRightStrip;

public TabHost makeTab(){
    if(this.tabHost == null){
        tabHost = (TabHost)findViewById(android.R.id.tabhost);
        tabWidget = (TabWidget)findViewById(android.R.id.tabs);
        tabHost.setup();
        tabHost.bringToFront();
        
        TabSpec nearby_tab = tabHost.newTabSpec("nearby_tab");
        TabSpec history_tab = tabHost.newTabSpec("history_tab");
        TabSpec about_tab = tabHost.newTabSpec("about_tab");
        
        nearby_tab.setIndicator("first",getResources().getDrawable(R.drawable.first)).setContent(new Intent(this,first.class));
        history_tab.setIndicator("second",getResources().getDrawable(R.drawable.second)).setContent(new Intent(this,second.class));
        about_tab.setIndicator("third",getResources().getDrawable(R.drawable.third)).setContent(new Intent(this,third.class));
        
        tabHost.addTab(nearby_tab);
        tabHost.addTab(history_tab);
        tabHost.addTab(about_tab);

        if (Integer.valueOf(Build.VERSION.SDK) <= 7) {
            try {
                mBottomLeftStrip = tabWidget.getClass().getDeclaredField ("mBottomLeftStrip");
                mBottomRightStrip = tabWidget.getClass().getDeclaredField ("mBottomRightStrip");
                if(!mBottomLeftStrip.isAccessible()) {
                    mBottomLeftStrip.setAccessible(true);
                }
                if(!mBottomRightStrip.isAccessible()){
                    mBottomRightStrip.setAccessible(true);
                }
                mBottomLeftStrip.set(tabWidget, getResources().getDrawable (R.drawable.linee));
                mBottomRightStrip.set(tabWidget, getResources().getDrawable (R.drawable.linee));

            } catch (Exception e) {
                e.printStackTrace();
            }
        } else {
            try {
                mBottomLeftStrip = tabWidget.getClass().getDeclaredField("mLeftStrip");
                mBottomRightStrip = tabWidget.getClass().getDeclaredField("mRightStrip");
                if (!mBottomLeftStrip.isAccessible()) {
                    mBottomLeftStrip.setAccessible(true);
                }
                if (!mBottomRightStrip.isAccessible()) {
                    mBottomRightStrip.setAccessible(true);
                }
                mBottomLeftStrip.set(tabWidget, getResources().getDrawable(R.drawable.linee));
                mBottomRightStrip.set(tabWidget, getResources().getDrawable(R.drawable.linee));
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        
        for (int i =0; i <tabWidget.getChildCount(); i++) {
            
            final TextView tv = (TextView) tabWidget.getChildAt(i).findViewById(android.R.id.title);
            tv.setTextColor(Color.WHITE);
            View vvv = tabWidget.getChildAt(i);
            if(tabHost.getCurrentTab()==i){
                vvv.setBackgroundDrawable(getResources().getDrawable(R.drawable.focus));
            }
            else {
                vvv.setBackgroundDrawable(getResources().getDrawable(R.drawable.unfocus));
            }
        }
        
        tabHost.setOnTabChangedListener(new OnTabChangeListener(){

            @Override
            public void onTabChanged(String tabId) {
            // TODO Auto-generated method stub
            for (int i =0; i < tabWidget.getChildCount(); i++) {
                View vvv = tabWidget.getChildAt(i);
                if(tabHost.getCurrentTab()==i){
                    vvv.setBackgroundDrawable(getResources().getDrawable(R.drawable.focus));
                }
                else {
                    vvv.setBackgroundDrawable(getResources().getDrawable(R.drawable.unfocus));
                }
            }
            }
        });
    }
    else{
        return tabHost;
    }
    return null;
}

用到的布局xml文件内容如下：

<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="wrap_content"
         android:layout_weight="1">
      </FrameLayout>
      <TabWidget
         android:id="@android:id/tabs"
         android:layout_width="fill_parent"
         android:layout_alignParentBottom="true"
         android:layout_height="wrap_content"/>  
    </LinearLayout>
</TabHost>