Android应用底部导航栏(选项卡)实例

现在很多android的应用都采用底部导航栏的功能，这样可以使得用户在使用过程中随意切换不同的页面，现在我采用TabHost组件来自定义一个底部的导航栏的功能。

我们先看下该demo实例的框架图：

其中各个类的作用以及资源文件就不详细解释了，还有资源图片(在该Demo中借用了其它应用程序的资源图片)也不提供了，大家可以自行更换自己需要的资源图片。直接上各个布局文件或各个类的代码：

[1]  res/layout目录下的 maintabs.xml 源码：

<?xml version="1.0" encoding="UTF-8"?><TabHost android:id="@android:id/tabhost" android:layout_width="fill_parent" android:layout_height="fill_parent"  xmlns:android="http://schemas.android.com/apk/res/android">    <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:visibility="gone" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="0.0" />            <RadioGroup                 android:gravity="center_vertical" android:layout_gravity="bottom" android:orientation="horizontal" android:id="@id/main_radio" android:background="@drawable/maintab_toolbar_bg"                 android:layout_width="fill_parent" android:layout_height="wrap_content">                <RadioButton  android:id="@id/radio_button0" android:layout_marginTop="2.0dip" android:text="@string/main_home" android:drawableTop="@drawable/icon_1_n" style="@style/main_tab_bottom" />                <RadioButton  android:id="@id/radio_button1" android:layout_marginTop="2.0dip" android:text="@string/main_news" android:drawableTop="@drawable/icon_2_n" style="@style/main_tab_bottom" />                <RadioButton  android:id="@id/radio_button2" android:layout_marginTop="2.0dip" android:text="@string/main_manage_date" android:drawableTop="@drawable/icon_3_n" style="@style/main_tab_bottom" />                <RadioButton  android:id="@id/radio_button3" android:layout_marginTop="2.0dip" android:text="@string/main_friends" android:drawableTop="@drawable/icon_4_n" style="@style/main_tab_bottom" />                <RadioButton  android:id="@id/radio_button4" android:layout_marginTop="2.0dip" android:text="@string/more" android:drawableTop="@drawable/icon_5_n" style="@style/main_tab_bottom" />            </RadioGroup>    </LinearLayout></TabHost>

[2] res/drawable 下的 home_btn_bg.xml 源码：

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

[3] res/values 下的源码：

dimens.xml源码

<?xml version="1.0" encoding="utf-8"?><resources>    <dimen name="bottom_tab_font_size">10.0sp</dimen>    <dimen name="bottom_tab_padding_up">5.0dip</dimen>    <dimen name="bottom_tab_padding_drawable">2.0dip</dimen>    <dimen name="switch_logo_bottom_padding">30.0sp</dimen>    <dimen name="widget_height">100.0dip</dimen>    <dimen name="sta_height">48.0dip</dimen>    <dimen name="large_padding_length">20.0dip</dimen>    <dimen name="widget_write_margin_top">19.0dip</dimen>    <dimen name="widget_write_margin_left">10.0dip</dimen>    <dimen name="widget_content_margin_top">20.0dip</dimen>    <dimen name="widget_content_margin_left">10.0dip</dimen>    <dimen name="widget_logo_size">35.0dip</dimen>    <dimen name="title_height">74.0dip</dimen>    <dimen name="new_blog_size">70.0dip</dimen>    <dimen name="emotion_item_view_height">13.299988dip</dimen>    <dimen name="splash_test_top_margin_top">20.0dip</dimen>    <dimen name="splash_test_center_margin_right">0.0dip</dimen>    <dimen name="title_text_size">20.0sp</dimen>    <dimen name="normal_padding_length">10.0dip</dimen>    <dimen name="no_result_padding_length">50.0dip</dimen></resources>

drawables.xml源码

<?xml version="1.0" encoding="utf-8"?><resources>    <item type="drawable" name="ltgray">#fff4f4f4</item>    <item type="drawable" name="ltyellow">#fffff4db</item>    <item type="drawable" name="black">#ff000000</item>    <item type="drawable" name="transparent">#00000000</item>    <item type="drawable" name="widget_edit_block_bg_normal">@android:color/transparent</item>    <item type="drawable" name="transparent_background">#99000000</item>    <item type="drawable" name="list_background">#fff4f4f4</item>    <item type="drawable" name="namcard_picker_bkg_normal">#ff272727</item>    <item type="drawable" name="namcard_picker_bkg_hover">#ff333333</item></resources>

ids.xml源码：

<?xml version="1.0" encoding="utf-8"?><resources>    <item type="id" name="main_radio">false</item>    <item type="id" name="radio_button0">false</item>    <item type="id" name="radio_button1">false</item>    <item type="id" name="radio_button2">false</item>    <item type="id" name="radio_button3">false</item>    <item type="id" name="radio_button4">false</item></resources>

strings.xml源码：

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="hello">Hello World, MainTabActivity!</string>    <string name="app_name">TabDemo</string>    <string name="main_news">消息</string>    <string name="main_home">首页</string>    <string name="more">更多</string>    <string name="main_manage_date">时间</string>    <string name="main_friends">好友</string></resources>

styles.xml源码：

<?xml version="1.0" encoding="utf-8"?><resources>     <style name="main_tab_bottom">        <item name="android:textSize">@dimen/bottom_tab_font_size</item>        <item name="android:textColor">#ffffffff</item>        <item name="android:ellipsize">marquee</item>        <item name="android:gravity">center_horizontal</item>        <item name="android:background">@drawable/home_btn_bg</item>        <item name="android:paddingTop">@dimen/bottom_tab_padding_up</item>        <item name="android:paddingBottom">2.0dip</item>        <item name="android:layout_width">fill_parent</item>        <item name="android:layout_height">wrap_content</item>        <item name="android:layout_marginBottom">2.0dip</item>        <item name="android:button">@null</item>        <item name="android:singleLine">true</item>        <item name="android:drawablePadding">@dimen/bottom_tab_padding_drawable</item>        <item name="android:layout_weight">1.0</item>    </style></resources>

[4] src/com.andyidea.tabdemo包下面各个UI界面类源码：

MainTabActivity.java源码：

package com.andyidea.tabdemo;import android.app.TabActivity;import android.content.Intent;import android.os.Bundle;import android.view.Window;import android.widget.CompoundButton;import android.widget.RadioButton;import android.widget.CompoundButton.OnCheckedChangeListener;import android.widget.TabHost;public class MainTabActivity extends TabActivity implements OnCheckedChangeListener{private TabHost mTabHost;private Intent mAIntent;private Intent mBIntent;private Intent mCIntent;private Intent mDIntent;private Intent mEIntent;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        requestWindowFeature(Window.FEATURE_NO_TITLE);        setContentView(R.layout.maintabs);                this.mAIntent = new Intent(this,AActivity.class);        this.mBIntent = new Intent(this,BActivity.class);        this.mCIntent = new Intent(this,CActivity.class);        this.mDIntent = new Intent(this,DActivity.class);        this.mEIntent = new Intent(this,EActivity.class);        ((RadioButton) findViewById(R.id.radio_button0)).setOnCheckedChangeListener(this);        ((RadioButton) findViewById(R.id.radio_button1)).setOnCheckedChangeListener(this);        ((RadioButton) findViewById(R.id.radio_button2)).setOnCheckedChangeListener(this);        ((RadioButton) findViewById(R.id.radio_button3)).setOnCheckedChangeListener(this);        ((RadioButton) findViewById(R.id.radio_button4)).setOnCheckedChangeListener(this);                setupIntent();    }@Overridepublic void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {if(isChecked){switch (buttonView.getId()) {case R.id.radio_button0:this.mTabHost.setCurrentTabByTag("A_TAB");break;case R.id.radio_button1:this.mTabHost.setCurrentTabByTag("B_TAB");break;case R.id.radio_button2:this.mTabHost.setCurrentTabByTag("C_TAB");break;case R.id.radio_button3:this.mTabHost.setCurrentTabByTag("D_TAB");break;case R.id.radio_button4:this.mTabHost.setCurrentTabByTag("MORE_TAB");break;}}}private void setupIntent() {this.mTabHost = getTabHost();TabHost localTabHost = this.mTabHost;localTabHost.addTab(buildTabSpec("A_TAB", R.string.main_home,R.drawable.icon_1_n, this.mAIntent));localTabHost.addTab(buildTabSpec("B_TAB", R.string.main_news,R.drawable.icon_2_n, this.mBIntent));localTabHost.addTab(buildTabSpec("C_TAB",R.string.main_manage_date, R.drawable.icon_3_n,this.mCIntent));localTabHost.addTab(buildTabSpec("D_TAB", R.string.main_friends,R.drawable.icon_4_n, this.mDIntent));localTabHost.addTab(buildTabSpec("MORE_TAB", R.string.more,R.drawable.icon_5_n, this.mEIntent));}private TabHost.TabSpec buildTabSpec(String tag, int resLabel, int resIcon,final Intent content) {return this.mTabHost.newTabSpec(tag).setIndicator(getString(resLabel),getResources().getDrawable(resIcon)).setContent(content);}}

其中 AActivity.java 与 BActivity.java ，

CActivity.java ，DActivity.java ，EActivity.java 中的源码都一样，

只是用来表示不同的界面展示，故这里只列出 AActivity.java的源码：

package com.andyidea.tabdemo;import android.app.Activity;import android.os.Bundle;import android.view.Gravity;import android.widget.TextView;public class AActivity extends Activity{@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);TextView tv = new TextView(this);tv.setText("This is A Activity!");tv.setGravity(Gravity.CENTER);setContentView(tv);}}

最后，大家别忘了在 AndroidManifest.xml 文件中注册各个 Activity 组件哦。好了，现在我们看下我们程序运行的效果图：

转载出处：http://blog.csdn.net/cjjky/article/details/7209056