底部菜单栏（二） TabHost & RadioGroup 实现

需求：使用TabHost & RadioGroup实现底部菜单栏；

效果图：

实现分析：

1.目录结构：

代码实现：

1. activity_main.xml

<?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:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >

        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="fill_parent"
            android:layout_height="0.0dip"
            android:layout_weight="1.0" />

        <TabWidget
            android:id="@android:id/tabs"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="0.0"
            android:visibility="gone" />

        <RadioGroup
            android:id="@+id/main_radiogroup"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom"
            android:background="@drawable/tab_widget_background"
            android:gravity="center_vertical"
            android:orientation="horizontal"
            android:padding="2dip" >

            <RadioButton
                android:id="@+id/RadioButton0"
                style="@style/tab_item_background"
                android:checked="true"
                android:drawableTop="@drawable/tab_icon1"
                android:text="主页" />

            <RadioButton
                android:id="@+id/RadioButton1"
                style="@style/tab_item_background"
                android:drawableTop="@drawable/tab_icon2"
                android:text="关于" />

            <RadioButton
                android:id="@+id/RadioButton2"
                style="@style/tab_item_background"
                android:drawableTop="@drawable/tab_icon3"
                android:text="设置" />

            <RadioButton
                android:id="@+id/RadioButton3"
                style="@style/tab_item_background"
                android:drawableTop="@drawable/tab_icon4"
                android:text="搜索" />

            <RadioButton
                android:id="@+id/RadioButton4"
                style="@style/tab_item_background"
                android:drawableTop="@drawable/tab_icon5"
                android:text="更多" />
        </RadioGroup>
    </LinearLayout>

</TabHost>

2. styles.xml

    <style name="item_tab_text_style">
        <item name="android:textSize">10.0dip</item>
        <item name="android:textColor">#ffffffff</item>
        <item name="android:ellipsize">marquee</item>
        <item name="android:singleLine">true</item>
    </style>

    <style name="tab_item_background">
        <item name="android:textAppearance">@style/item_tab_text_style</item>
        <item name="android:gravity">center_horizontal</item>
        <item name="android:background">@drawable/tab_background_selector</item>
        <item name="android:layout_width">fill_parent</item>
        <item name="android:layout_height">wrap_content</item>
        <item name="android:button">@null</item>
        <item name="android:drawablePadding">3.0dip</item>
        <item name="android:layout_weight">1.0</item>
    </style>

3. MainActivity.java

package com.jjc.demo;

import com.jjc.demo.Constant.ConValue;

import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TabHost;
import android.widget.TabHost.TabSpec;

public class MainActivity extends TabActivity {

    //定义TabHost对象  
    private TabHost mTabHost;  
      
    //定义RadioGroup对象  
    private RadioGroup radioGroup; 

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initView();
        initData();
    }

    /**
     * 初始化组件
     */
    private void initView() {
        // 实例化TabHost对象，得到TabHost
        mTabHost = getTabHost();

        // 得到Activity的个数
        int count = ConValue.mTabClassArray.length;

        for (int i = 0; i < count; i++) {
            //为每一个Tab按钮设置图标、文字和内容  
            TabSpec tabSpec = mTabHost.newTabSpec(ConValue.mTextViewArray[i]).setIndicator(ConValue.mTextViewArray[i]).setContent(getTabItemIntent(i));  
            //将Tab按钮添加进Tab选项卡中  
            mTabHost.addTab(tabSpec); 
        }
        
        //实例化RadioGroup  
        radioGroup = (RadioGroup) findViewById(R.id.main_radiogroup);
    }
    
    private void initData(){
        // 给radioGroup设置监听事件  
        radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener(){

            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                switch (checkedId) {
                case R.id.RadioButton0:
                    mTabHost.setCurrentTabByTag(ConValue.mTextViewArray[0]); 
                    break;
                case R.id.RadioButton1:
                    mTabHost.setCurrentTabByTag(ConValue.mTextViewArray[1]); 
                    break;
                case R.id.RadioButton2:
                    mTabHost.setCurrentTabByTag(ConValue.mTextViewArray[2]); 
                    break;
                case R.id.RadioButton3:
                    mTabHost.setCurrentTabByTag(ConValue.mTextViewArray[3]); 
                    break;
                case R.id.RadioButton4:
                    mTabHost.setCurrentTabByTag(ConValue.mTextViewArray[4]); 
                    break;
                default:
                    break;
                }
                
            }});
    }

    /**
     * 给Tab选项卡设置内容（每个内容是一个Activity）
     */
    private Intent getTabItemIntent(int index) {
        Intent intent = new Intent(this, ConValue.mTabClassArray[index]);
        return intent;
    }
}