关于Android TabHost切换Tab字体的颜色背景颜色改变

最近在做一个平板电脑点餐的系统，要用到TabHost，不太好写，写好了分享给大家，先上图片，默认效果：

切换后效果

先是layout文件夹中的布局文件，代码如下：

    android:id="@android:id/tabhost"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >


            android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical"
        android:background="@drawable/category_bg"
        android:padding="0dp" >


                    android:id="@android:id/tabs"
            android:layout_width="wrap_content"
            android:layout_height="40dp"/>


                    android:id="@android:id/tabcontent"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:background="@drawable/context_bg"
            android:padding="0dp" />
   

然后是java文件，

package com.dzdc.activity;


import android.app.TabActivity;
import android.content.Intent;
import android.graphics.Typeface;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.TabHost;
import android.widget.TabHost.OnTabChangeListener;
import android.widget.TextView;


import com.dzdc.R;


@SuppressWarnings("deprecation")
public class IndexActivity extends TabActivity {
	private String[] tabMenu = { "热菜", "冷菜", "海鲜", "川菜", "酒饮", "招牌菜" };
	private Intent intent0, intent1, intent2, intent3, intent4, intent5;
	private Intent[] intents = { intent0, intent1, intent2, intent3, intent4,
			intent5 };
	private TabHost.TabSpec tabSpec0, tabSpec1, tabSpec2, tabSpec3, tabSpec4,
			tabSpec5;
	private TabHost.TabSpec[] tabSpecs = { tabSpec0, tabSpec1, tabSpec2,
			tabSpec3, tabSpec4, tabSpec5 };


	private TabHost tabHost = null;


	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);// 去掉标题栏
		getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
				WindowManager.LayoutParams.FLAG_FULLSCREEN);
		setContentView(R.layout.index);


		tabHost = getTabHost();


		for (int i = 0; i < tabMenu.length; i++) {
			intents[i] = new Intent();
			intents[i].setClass(this, IndexContentActivity.class);


			tabSpecs[i] = tabHost.newTabSpec(tabMenu[i]);
			tabSpecs[i].setIndicator(tabMenu[i]);// 设置文字
			tabSpecs[i].setContent(intents[i]);// 设置该页的内容


			tabHost.addTab(tabSpecs[i]);// 将该页的内容添加到Tabhost
		}


		tabHost.setCurrentTabByTag(tabMenu[0]); // 设置第一次打开时默认显示的标签，
		
		updateTab(tabHost);//初始化Tab的颜色，和字体的颜色
		
		tabHost.setOnTabChangedListener(new OnTabChangedListener()); // 选择监听器


	}


	class OnTabChangedListener implements OnTabChangeListener {


		@Override
		public void onTabChanged(String tabId) {
			tabHost.setCurrentTabByTag(tabId);
			System.out.println("tabid " + tabId);
			System.out.println("curreny after: " + tabHost.getCurrentTabTag());
			updateTab(tabHost);
		}
	}


	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
			System.exit(0);
			return false;
		} else if (keyCode == KeyEvent.KEYCODE_MENU
				&& event.getRepeatCount() == 0) {
			return true; // 返回true就不会弹出默认的setting菜单
		}


		return false;
	}
	
	/**
     * 更新Tab标签的颜色，和字体的颜色
     * @param tabHost
     */
    private void updateTab(final TabHost tabHost) {
        for (int i = 0; i < tabHost.getTabWidget().getChildCount(); i++) {
            View view = tabHost.getTabWidget().getChildAt(i);
            TextView tv = (TextView) tabHost.getTabWidget().getChildAt(i).findViewById(android.R.id.title);
 			tv.setTextSize(16);
 			tv.setTypeface(Typeface.SERIF, 2); // 设置字体和风格
            if (tabHost.getCurrentTab() == i) {//选中
                view.setBackgroundDrawable(getResources().getDrawable(R.drawable.category_current));//选中后的背景
                tv.setTextColor(this.getResources().getColorStateList(
     					android.R.color.black));
            } else {//不选中
                view.setBackgroundDrawable(getResources().getDrawable(R.drawable.category_bg));//非选择的背景
                tv.setTextColor(this.getResources().getColorStateList(
     					android.R.color.white));
            }
        }
    }
}