Android：布局实例之模仿微信Tab

微信Tab预览效果：

思路：

1、用TabHost+RadioGroup搭建基本布局，以RadioGroup代替TabWidget

2、设置按钮和文字的的样式和selector

3、创建相应的Activity

4、实现按钮和内容切换

布局：

<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@android:id/tabhost"
     >
     
    <LinearLayout 
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        >
    <FrameLayout 
        android:id="@android:id/tabcontent"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"        
        ></FrameLayout>
    
    <!-- 隐藏TabWidget -->
<TabWidget 
    android:id="@android:id/tabs"
    android:visibility="gone"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    >
  </TabWidget>  
  
<!-- 视觉上,用单选按钮替代TabWidget -->
    <RadioGroup 
        android:id="@+id/main_radiogroup"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/mmfooter_bg"
          android:paddingTop="8dp"      
       android:orientation="horizontal"
        >
        <RadioButton 
          android:id="@+id/tab_icon_weixin"
          android:checked="true"
          android:textColor="@color/tab_text"    
          android:drawableTop="@drawable/tab_weixin"    
          android:text="@string/radio1_text"
          style="@style/tab_button_bg"
            />
        
         <RadioButton 
           android:id="@+id/tab_icon_address"   
          android:textColor="@color/tab_text"    
          android:drawableTop="@drawable/tab_address"    
          android:text="@string/radio2_text"
          style="@style/tab_button_bg"
            />
         
         
          <RadioButton 
          android:id="@+id/tab_icon_friend"   
          android:textColor="@color/tab_text"    
          android:drawableTop="@drawable/tab_frd"    
          android:text="@string/radio3_text"
          style="@style/tab_button_bg"
            />
          
          
           <RadioButton 
          android:id="@+id/tab_icon_setting"          
          android:textColor="@color/tab_text"    
          android:drawableTop="@drawable/tab_set"    
          android:text="@string/radio4_text"
          style="@style/tab_button_bg"
            />
        
    </RadioGroup>
</LinearLayout>
</TabHost>

按钮样式：

    <!-- 按钮文字样式 -->
    <style name="tab_text_color">
        <item name="android:textColor">@color/tab_text</item>
        <item name="android:textSize">12dp</item>  
        <!-- 从左向右跑马灯效果 -->
        <item name="android:ellipsize">marquee</item>   
        <!-- 单行显示 -->
        <item name="android:singleLine">true</item>   
    </style>
    
    <!-- 按钮样式 -->
    <style name="tab_button_bg">
        <item name="android:textAppearance">@style/tab_text_color</item>
          <item name="android:gravity">center</item>  
        <item name="android:background">@drawable/tab_bg</item>
        <item name="android:layout_width">0dp</item>
        <item name="android:layout_height">wrap_content</item>
        <item name="android:button">@null</item>
        <item name="android:layout_weight">1</item> 
    </style>

按钮图片selector

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:state_enabled="true" android:state_checked="true" android:drawable="@drawable/tab_address_pressed"></item>
 <item android:drawable="@drawable/tab_address_normal"></item>
</selector>

按钮文字selector

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:state_checked="true" android:color="@color/white"></item>
  <item android:color="@color/grey"></item>
</selector>

程序：

public class MainActivity extends TabActivity{
    private TabHost tabhost;
    private RadioGroup main_radiogroup;  
     private RadioButton tab_icon_weixin, tab_icon_address, tab_icon_friend,tab_icon_setting;  
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.demo);
        
        //获取按钮
        main_radiogroup = (RadioGroup) findViewById(R.id.main_radiogroup);
        
        tab_icon_weixin = (RadioButton) findViewById(R.id.tab_icon_weixin);
        tab_icon_address = (RadioButton) findViewById(R.id.tab_icon_address);
        tab_icon_friend = (RadioButton) findViewById(R.id.tab_icon_friend);
        tab_icon_setting = (RadioButton) findViewById(R.id.tab_icon_setting);
        
        //往TabWidget添加Tab
        tabhost = getTabHost();
        tabhost.addTab(tabhost.newTabSpec("tag1").setIndicator("0").setContent(new Intent(this,Activity1.class)));
        tabhost.addTab(tabhost.newTabSpec("tag2").setIndicator("1").setContent(new Intent(this,Activity2.class)));
        tabhost.addTab(tabhost.newTabSpec("tag3").setIndicator("2").setContent(new Intent(this,Activity3.class)));
        tabhost.addTab(tabhost.newTabSpec("tag4").setIndicator("3").setContent(new Intent(this,Activity4.class)));
         
        //设置监听事件
        checkListener checkradio = new checkListener();
        main_radiogroup.setOnCheckedChangeListener(checkradio);
    }

    
    //监听类
    public class checkListener implements OnCheckedChangeListener{
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            // TODO Auto-generated method stub
            //setCurrentTab 通过标签索引设置当前显示的内容
            //setCurrentTabByTag 通过标签名设置当前显示的内容
            switch(checkedId){
            case R.id.tab_icon_weixin:
                tabhost.setCurrentTab(0);
                //或
                //tabhost.setCurrentTabByTag("tag1");
                break;
            case R.id.tab_icon_address:
                tabhost.setCurrentTab(1);
                break;
            case R.id.tab_icon_friend:
                tabhost.setCurrentTab(2);
                break;
            case R.id.tab_icon_setting:
                tabhost.setCurrentTab(3);
                break;
            }

            
        }
    }
   

}

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