实现方式一：通过TabWidget实现

这种方式主要是在布局中将TabWidget标签嵌套在RelativeLayout中，并且在TabWidget标签中中设置android:layout_alignParentBottom="true"

另外，下划线和选项卡之间的线去除的方法时在TabWidget标签中设置属性android:tabStripEnabled="false"

xml代码：

xml version="1.0" encoding="utf-8"?>
<TabHostxmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
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="fill_parent"
android:padding="5dp"
>FrameLayout>

<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent">


<TabWidget
android:id="@android:id/tabs"
android:tabStripEnabled="false"
android:background="#6E6E6E"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
>TabWidget>

RelativeLayout>

TabHost>

实现代码：

packagecom.loulijun.demo1;

importandroid.app.TabActivity;
importandroid.content.Intent;
importandroid.os.Bundle;
importandroid.widget.TabHost;

publicclassDemo1ActivityextendsTabActivity {
/**Called when the activity is first created.*/
privateTabHost tabhost;
privateIntent intent1, intent2, intent3, intent4;
@Override
publicvoidonCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tabhost = getTabHost();

intent1 =newIntent(Demo1Activity.this, One.class);
tabhost.addTab(tabhost.newTabSpec("one")
.setIndicator("电话",getResources().getDrawable(android.R.drawable.ic_menu_call))
.setContent(intent1));

intent2 =newIntent(Demo1Activity.this, Two.class);
tabhost.addTab(tabhost.newTabSpec("two")
.setIndicator("相机",getResources().getDrawable(android.R.drawable.ic_menu_camera))
.setContent(intent2));

intent3 =newIntent(Demo1Activity.this, Three.class);
tabhost.addTab(tabhost.newTabSpec("three")
.setIndicator("分享",getResources().getDrawable(android.R.drawable.ic_menu_share))
.setContent(intent3));

intent4 =newIntent(Demo1Activity.this, Four.class);
tabhost.addTab(tabhost.newTabSpec("four")
.setIndicator("更多",getResources().getDrawable(android.R.drawable.ic_menu_more))
.setContent(intent4));
}
}

运行图：

实现方式二：隐藏TabWidget，通过RadioGroup和RadioButton实现底部菜单栏

这种方式更漂亮，也更灵活，网上基本用的是这种方式，通过setCurrentTabByTag来切换不同的选项卡

main.xml：

xml version="1.0" encoding="utf-8"?>
<TabHostxmlns: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="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_tab"
android:background="@drawable/maintab_toolbar_bg"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:layout_gravity="bottom">
<RadioButton
android:layout_marginTop="2.0dip"
android:text="@string/main_home"
android:drawableTop="@drawable/icon_1_n"
android:id="@+id/radio_button0"
style="@style/main_tab_bottom"/>
<RadioButton
android:layout_marginTop="2.0dip"
android:text="@string/main_news"
android:drawableTop="@drawable/icon_2_n"
android:id="@+id/radio_button1"
style="@style/main_tab_bottom"/>
<RadioButton
android:layout_marginTop="2.0dip"
android:text="@string/main_my_info"
android:drawableTop="@drawable/icon_3_n"
android:id="@+id/radio_button2"
style="@style/main_tab_bottom"/>
<RadioButton
android:layout_marginTop="2.0dip"
android:text="@string/menu_search"
android:drawableTop="@drawable/icon_4_n"
android:id="@+id/radio_button3"
style="@style/main_tab_bottom"/>
<RadioButton
android:layout_marginTop="2.0dip"
android:text="@string/more"
android:drawableTop="@drawable/icon_5_n"
android:id="@+id/radio_button4"
style="@style/main_tab_bottom"/>
RadioGroup>
LinearLayout>
TabHost>

drawable/home_btn_bg.xml：切换时的效果：

xml version="1.0" encoding="UTF-8"?>
<selector
xmlns:android="http://schemas.android.com/apk/res/android">
<itemandroid:state_focused="true"android:state_enabled="true"android:state_pressed="false"android:drawable="@drawable/home_btn_bg_s"/>
<itemandroid:state_enabled="true"android:state_pressed="true"android:drawable="@drawable/home_btn_bg_s"/>
<itemandroid:state_enabled="true"android:state_checked="true"android:drawable="@drawable/home_btn_bg_d"/>
<itemandroid:drawable="@drawable/transparent"/>
selector>

string/dimens.xml 尺寸文件：

xml version="1.0" encoding="utf-8"?>
<resources>
<dimenname="bottom_tab_padding_drawable">2.0dipdimen>
<dimenname="bottom_tab_padding_up">5.0dipdimen>
<dimenname="bottom_tab_font_size">10.0dipdimen>
resources>

string/drawables.xml 设置为透明:

xml version="1.0" encoding="utf-8"?>
<resources>
<itemtype="drawable"name="transparent">#00000000item>
resources>

string/styles.xml 样式文件:

xml version="1.0" encoding="utf-8"?>
<resources>
<stylename="main_tab_bottom">
<itemname="android:textSize">@dimen/bottom_tab_font_sizeitem>
<itemname="android:textColor">#ffffffffitem>
<itemname="android:ellipsize">marqueeitem>
<itemname="android:gravity">center_horizontalitem>
<itemname="android:background">@drawable/home_btn_bgitem>
<itemname="android:paddingTop">@dimen/bottom_tab_padding_upitem>
<itemname="android:layout_width">fill_parentitem>
<itemname="android:layout_height">wrap_contentitem>
<itemname="android:button">@nullitem>
<itemname="android:singleLine">trueitem>
<itemname="android:drawablePadding">@dimen/bottom_tab_padding_drawableitem>
<itemname="android:layout_weight">1.0item>
style>
resources>

代码：

importandroid.app.TabActivity;
importandroid.content.Intent;
importandroid.os.Bundle;
importandroid.view.Window;
importandroid.widget.RadioGroup;
importandroid.widget.TabHost;
importandroid.widget.RadioGroup.OnCheckedChangeListener;
publicclassMainTabActivityextendsTabActivityimplementsOnCheckedChangeListener{
privateRadioGroup mainTab;
privateTabHost tabhost;
privateIntent iHome;
privateIntent iNews;
privateIntent iInfo;
privateIntent iSearch;
privateIntent iMore;

@Override
publicvoidonCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
mainTab=(RadioGroup)findViewById(R.id.main_tab);
mainTab.setOnCheckedChangeListener(this);
tabhost = getTabHost();

iHome =newIntent(this, HomeActivity.class);
tabhost.addTab(tabhost.newTabSpec("iHome")
.setIndicator(getResources().getString(R.string.main_home), getResources().getDrawable(R.drawable.icon_1_n))
.setContent(iHome));

iNews =newIntent(this, NewsActivity.class);
tabhost.addTab(tabhost.newTabSpec("iNews")
.setIndicator(getResources().getString(R.string.main_news), getResources().getDrawable(R.drawable.icon_2_n))
.setContent(iNews));

iInfo =newIntent(this, MyInfoActivity.class);
tabhost.addTab(tabhost.newTabSpec("iInfo")
.setIndicator(getResources().getString(R.string.main_my_info), getResources().getDrawable(R.drawable.icon_3_n))
.setContent(iInfo));

iSearch =newIntent(this,SearchActivity.class);
tabhost.addTab(tabhost.newTabSpec("iSearch")
.setIndicator(getResources().getString(R.string.menu_search), getResources().getDrawable(R.drawable.icon_4_n))
.setContent(iSearch));

iMore =newIntent(this, MoreActivity.class);
tabhost.addTab(tabhost.newTabSpec("iMore")
.setIndicator(getResources().getString(R.string.more), getResources().getDrawable(R.drawable.icon_5_n))
.setContent(iMore));
}


@Override
publicvoidonCheckedChanged(RadioGroup group,intcheckedId) {
switch(checkedId){
caseR.id.radio_button0:
this.tabhost.setCurrentTabByTag("iHome");
break;
caseR.id.radio_button1:
this.tabhost.setCurrentTabByTag("iNews");
break;
caseR.id.radio_button2:
this.tabhost.setCurrentTabByTag("iInfo");
break;
caseR.id.radio_button3:
this.tabhost.setCurrentTabByTag("iSearch");
break;
caseR.id.radio_button4:
this.tabhost.setCurrentTabByTag("iMore");
break;
}
}
}

运行图：