Android TabHost 的美化与设计

<?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="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>

//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;
}