关于安卓开发实现底部菜单栏（已过时做法，不建议使用）

将TabHost的标签放在底部

直接上代码

主代码：

package sdut;

import com.example.sdutfriends.R;

import android.app.AlertDialog;
import android.app.TabActivity;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.Window;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TabHost;
import android.widget.TabHost.TabSpec;

public class SdutMainActivity extends TabActivity{
    private TabHost mth;
    private RadioGroup radioGroup;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        //去除标题
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.sdut_activity);
        
        //初始化底部菜单栏
        mth = this.getTabHost();
        
        TabSpec str1 = mth.newTabSpec("function_1").setIndicator("功能1");
        str1.setContent(new Intent(SdutMainActivity.this,SdutFindOldman.class));
        mth.addTab(str1); 
        
        TabSpec str2 = mth.newTabSpec("function_2").setIndicator("功能2");
        str2.setContent(new Intent(SdutMainActivity.this,SdutFindActivity.class));
        mth.addTab(str2);
        
        TabSpec str3 = mth.newTabSpec("function_3").setIndicator("功能3");
        str3.setContent(new Intent(SdutMainActivity.this,SdutFindOldman.class));
        mth.addTab(str3);
        
        TabSpec str4 = mth.newTabSpec("function_4").setIndicator("功能4");
        str4.setContent(new Intent(SdutMainActivity.this,SdutFindOldman.class));
        mth.addTab(str4);
        
        TabSpec str5 = mth.newTabSpec("function_5").setIndicator("功能5");
        str5.setContent(new Intent(SdutMainActivity.this,SdutFindOldman.class));
        mth.addTab(str5);
        
        //底部菜单栏点击事件
        radioGroup = (RadioGroup) findViewById(R.id.main_radio);
        radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                // TODO Auto-generated method stub
                switch(checkedId)
                {
            case R.id.radio_button0:mth.setCurrentTabByTag("function_1");break;
            case R.id.radio_button1:mth.setCurrentTabByTag("function_2");break;
            case R.id.radio_button2:mth.setCurrentTabByTag("function_3");break;
            case R.id.radio_button3:mth.setCurrentTabByTag("function_4");break;
            case R.id.radio_button4:mth.setCurrentTabByTag("function_5");break;

                }
            }
        });
    }
    
    //设置 返回键的 按钮响应事件
    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        // TODO Auto-generated method stub
         if (event.getAction() == KeyEvent.ACTION_DOWN && event.getKeyCode() == KeyEvent.KEYCODE_BACK)
          {
           new AlertDialog.Builder(this).setCancelable(false).setTitle("温馨提示").setMessage("您确定要退出吗?").setPositiveButton("确定", new DialogInterface.OnClickListener()
           {
            public void onClick(DialogInterface dialog, int which)
            {
             finish();
            }
           }).setNegativeButton("取消", new DialogInterface.OnClickListener()
           {
            public void onClick(DialogInterface dialog, int which)
            {
            }
           }).show();
           return true;// 不知道返回true或是false有什么区别??
          }

        return super.dispatchKeyEvent(event);
    }
}

layout代码

<?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"
    android:background="#334455" >                           //总体的背景  可以是图片   可以是颜色
    <LinearLayout 
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical"
        >
        <FrameLayout 
            android:id="@+id/msg_title"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:visibility="gone"
            >
            <TextView 
                android:id="@+id/tv_wb"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:background="@color/白色"/>
        </FrameLayout>
        <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_radio"
            android:layout_width="fill_parent"
            android:layout_height="45dp"
            android:layout_gravity="bottom"
            
            android:gravity="center_vertical"
            android:orientation="horizontal" >
            <RadioButton
                android:id="@+id/radio_button0"
                style="@style/main_tab_bottom"
                android:layout_height="fill_parent"
                android:layout_marginTop="2.0dip"
                android:textColor="@color/白色"                         
                android:background="@color/黑色"
                android:drawableTop="@drawable/icon"         //将图片放在文字上
                android:tag="radio_button0"
                android:text="标签1" />
            <RadioButton
                android:id="@+id/radio_button1"
                style="@style/main_tab_bottom"
                android:layout_height="fill_parent"
                android:layout_marginTop="2.0dip"
                android:tag="radio_button1"
                android:textColor="@color/白色"
                android:background="@color/黑色"
                android:drawableTop="@drawable/icon"
                android:text="标签2" />
            <RadioButton
                android:id="@+id/radio_button2"
                style="@style/main_tab_bottom"
                android:layout_height="fill_parent"
                android:layout_marginTop="2.0dip"
                android:textColor="@color/白色"
                android:background="@color/黑色"
                android:drawableTop="@drawable/icon"
                android:tag="radio_button2"
                android:text="标签3" />
            <RadioButton
                android:id="@+id/radio_button3"
                style="@style/main_tab_bottom"
                android:layout_height="fill_parent"
                android:layout_marginTop="2.0dip"
                android:textColor="@color/白色"
                android:background="@color/黑色"
                android:drawableTop="@drawable/icon"
                android:tag="radio_button3"
                android:text="标签4" />
            <RadioButton
                android:id="@+id/radio_button4"
                style="@style/main_tab_bottom"
                android:layout_height="fill_parent"
                android:layout_marginTop="2.0dip"
                android:textColor="@color/白色"
                android:background="@color/黑色"
                android:drawableTop="@drawable/icon"
                android:tag="radio_button4"
                android:text="标签5" />
        </RadioGroup>
            
        
    </LinearLayout>
    
    

</TabHost>

style.xml部分增加代码

    <style name="main_tab_bottom">
        <item name="android:textSize">10.0dip</item>
        <item name="android:textColor">#ffffffff</item>
        <item name="android:ellipsize">marquee</item>
        <item name="android:gravity">center_horizontal</item>
        <item name="android:paddingTop">1.0dip</item>
        <item name="android:layout_width">fill_parent</item>
        <item name="android:layout_height">fill_parent</item>
        <item name="android:button">@null</item>
        <item name="android:singleLine">true</item>
        <item name="android:drawablePadding">1.0dip</item>
        <item name="android:layout_weight">1.0</item>
    </style>

color.xml部分

<resources>
        <color name="黑色">#000000</color>
        <color name="白色">#FFFFFF</color>
</resources>

TabSpec str1 = mth.newTabSpec("function_1").setIndicator("功能1");
  str1.setContent(new Intent(SdutMainActivity.this,SdutFindOldman.class));
  mth.addTab(str1);
  
  TabSpec str2 = mth.newTabSpec("function_2").setIndicator("功能2");
  str2.setContent(new Intent(SdutMainActivity.this,SdutFindActivity.class));
  mth.addTab(str2);

这里的SdutFindOldman.class，，，SdutFindActivity.class代码就不贴了

效果图：