实例讲解Android应用开发中TabHost的使用要点

Tab与TabHost:

这就是Tab，而盛放Tab的容器就是TabHost 。
如何实现？？
每一个Tab还对应了一个布局，这个就有点好玩了。一个Activity，对应了多个功能布局。
新建一个Tab项目，注意，不要生成main Activity 。

注意IDE，这里不要选...
在包里面新建一个类MyTab，继承于TabActivity。
其实，TabActivity是Activity的子类

package zyf.tab.test;

import android.app.TabActivity;

public class MyTab extends TabActivity {

}

从父类继承OnCreate()入口方法

package zyf.tab.test;
import android.app.TabActivity;
import android.os.Bundle;
public class MyTab extends TabActivity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
  }
}

在Manifest.xml文件中注册一下MyTab类（Activity）

<activity android:name=".MyTab">
  <intent-filter>
    <action android:name="android.intent.action.MAIN"></action>
    <category android:name="android.intent.category.LAUNCHER"></category>
  </intent-filter>
</activity>

这时候，需要设计一下标签页对应的布局，一般采用FrameLayout作为根布局，每个标签页面对应一个子节点的Layout

<?xml version="1.0" encoding="utf-8"?>
<!-- 这里是根节点布局 -- >
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent" android:layout_height="fill_parent">

<!-- 第一个Tab 对应的布局 -- >
  <LinearLayout android:id="@+id/widget_layout_Blue"
    android:layout_width="fill_parent" android:layout_height="fill_parent"
    androidrientation="vertical" >
    <EditText android:id="@+id/widget34" android:layout_width="fill_parent"
      android:layout_height="wrap_content" android:text="EditText"
      android:textSize="18sp">
    </EditText>
    <Button android:id="@+id/widget30" android:layout_width="wrap_content"
      android:layout_height="wrap_content" android:text="Button">
    </Button>
  </LinearLayout>
<!-- 第二个Tab 对应的布局 -- >
  <LinearLayout android:id="@+id/widget_layout_red"
    android:layout_width="fill_parent" android:layout_height="fill_parent"
    androidrientation="vertical" >
    <AnalogClock android:id="@+id/widget36"
      android:layout_width="wrap_content" android:layout_height="wrap_content">
    </AnalogClock>
  </LinearLayout>
<!-- 第三个Tab 对应的布局 -- >
  <LinearLayout android:id="@+id/widget_layout_green"
    android:layout_width="fill_parent" android:layout_height="fill_parent"
    androidrientation="vertical">
    <RadioGroup android:id="@+id/widget43"
      android:layout_width="166px" android:layout_height="98px"
      androidrientation="vertical">
      <RadioButton android:id="@+id/widget44"
        android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:text="RadioButton">
      </RadioButton>
      <RadioButton android:id="@+id/widget45"
        android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:text="RadioButton">
      </RadioButton>
    </RadioGroup>
  </LinearLayout>
</FrameLayout>

首先，应该声明TabHost，然后用LayoutInflater过滤出布局来，给TabHost加上含有Tab页面的FrameLayout

private TabHost myTabhost;
myTabhost=this.getTabHost();//从TabActivity上面获取放置Tab的TabHost
LayoutInflater.from(this).inflate(R.layout.main, myTabhost.getTabContentView(), true);
//from(this)从这个TabActivity获取LayoutInflater
//R.layout.main 存放Tab布局
//通过TabHost获得存放Tab标签页内容的FrameLayout
//是否将inflate 拴系到根布局元素上
myTabhost.setBackgroundColor(Color.argb(150, 22, 70, 150));
//设置一下TabHost的颜色

接着，在TabHost创建一个标签，然后设置一下标题／图标／标签页布局

myTabhost.addTab(myTabhost.newTabSpec("TT")// 制造一个新的标签TT
   .setIndicator("KK",getResources().getDrawable(R.drawable.ajjc))
            // 设置一下显示的标题为KK，设置一下标签图标为ajjc
            .setContent(R.id.widget_layout_red));
    //设置一下该标签页的布局内容为R.id.widget_layout_red，这是FrameLayout中的一个子Layout

标签切换事件处理，setOnTabChangedListener

myTabhost.setOnTabChangedListener(new OnTabChangeListener(){
      @Override
      public void onTabChanged(String tabId) {
        // TODO Auto-generated method stub
      }
    });

各个标签页的动态MENU
先把在XML中设计好的MENU放到一个int数组里

private static final int myMenuResources[] = { R.menu.phonebook_menu,
      R.menu.addphone_menu, R.menu.chatting_menu, R.menu.userapp_menu };

在setOnTabChangedListener()方法中根据标签的切换情况来设置myMenuSettingTag

Override
  public void onTabChanged(String tagString) {
    // TODO Auto-generated method stub
    if (tagString.equals("One")) {
      myMenuSettingTag = 1;
    }
    if (tagString.equals("Two")) {
      myMenuSettingTag = 2;
    }
    if (tagString.equals("Three")) {
      myMenuSettingTag = 3;
    }
    if (tagString.equals("Four")) {
      myMenuSettingTag = 4;
    }
    if (myMenu != null) {
      onCreateOptionsMenu(myMenu);
    }
  }

然后onCreateOptionsMenu(Menu menu) 方法中通过MenuInflater过滤器动态加入MENU

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // TODO Auto-generated method stub
    // Hold on to this
    myMenu = menu;
    myMenu.clear();//清空MENU菜单
    // Inflate the currently selected menu XML resource.
    MenuInflater inflater = getMenuInflater();
//从TabActivity这里获取一个MENU过滤器
    switch (myMenuSettingTag) {
    case 1:
      inflater.inflate(myMenuResources[0], menu);
      //动态加入数组中对应的XML MENU菜单
      break;
    case 2:
      inflater.inflate(myMenuResources[1], menu);
      break;
    case 3:
      inflater.inflate(myMenuResources[2], menu);
      break;
    case 4:
      inflater.inflate(myMenuResources[3], menu);
      break;
    default:
      break;
    }
    return super.onCreateOptionsMenu(menu);
  }

menu 布局

<?xml version="1.0" encoding="utf-8"?>
<menu
 xmlns:android="http://schemas.android.com/apk/res/android">
<group android:id="@+id/group_a"><item android:id="@+id/item_a" android:icon="@drawable/gimp" android:title="Gimp"></item>
</group>
</menu>

运行效果

模仿微信导航实例：

<?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="match_parent"
  android:layout_height="match_parent" > 

  <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="0.0dip"
      android:layout_weight="1.0" >
    </FrameLayout> 

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

    <RadioGroup
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_gravity="bottom"
      android:background="@android:color/black"
      android:orientation="horizontal" > 

      <RadioButton
        android:id="@+id/talk"
        style="@style/rbt_bottom"
        android:drawableTop="@drawable/take_bottom"
        android:text="@string/talk" /> 

      <RadioButton
        android:id="@+id/address"
        style="@style/rbt_bottom"
        android:drawableTop="@drawable/adrress_bottom"
        android:text="@string/address" /> 

      <RadioButton
        android:id="@+id/find"
        style="@style/rbt_bottom"
        android:drawableTop="@drawable/find_bottom"
        android:text="@string/find" /> 

      <RadioButton
        android:id="@+id/me"
        style="@style/rbt_bottom"
        android:drawableTop="@drawable/me_bottom"
        android:text="@string/me" />
    </RadioGroup>
  </LinearLayout> 

</TabHost>

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"> 

  <item android:drawable="@drawable/n_address_l" android:state_checked="true" android:state_enabled="true"/>
  <item android:drawable="@drawable/n_address_h"/> 

</selector>

package com.android.xiong.bkclient; 

import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.RadioButton;
import android.widget.TabHost; 

@SuppressWarnings("deprecation")
public class MainActivity extends TabActivity implements
    OnCheckedChangeListener { 

  private TabHost tabHost;
  private Intent addressIntent;
  private Intent meIntent;
  private Intent takeIntent;
  private Intent findIntent; 

  private RadioButton findBt;
  private RadioButton addressBt;
  private RadioButton meBt;
  private RadioButton takeBt; 

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.tabhostmain);
    addressIntent = new Intent(this, AddressActivity.class);
    meIntent = new Intent(this, MeActivity.class);
    takeIntent = new Intent(this, TakeActivity.class);
    findIntent = new Intent(this, FindActivity.class);
    findBt = (RadioButton) findViewById(R.id.find);
    addressBt = (RadioButton) findViewById(R.id.address);
    meBt = (RadioButton) findViewById(R.id.me);
    takeBt = (RadioButton) findViewById(R.id.talk);
    tabHost =getTabHost();
    tabHost.addTab(tabHost.newTabSpec("take").setIndicator("take")
        .setContent(takeIntent));
    tabHost.addTab(tabHost.newTabSpec("address").setIndicator("address")
        .setContent(addressIntent));
    tabHost.addTab(tabHost.newTabSpec("find").setIndicator("find")
        .setContent(findIntent));
    tabHost.addTab(tabHost.newTabSpec("me").setIndicator("me")
        .setContent(meIntent));
    findBt.setOnCheckedChangeListener(this);
    meBt.setOnCheckedChangeListener(this);
    takeBt.setOnCheckedChangeListener(this);
    addressBt.setOnCheckedChangeListener(this);
  } 

  @Override
  public void onCheckedChanged(CompoundButton view, boolean ischeak) {
    if (ischeak) {
      switch (view.getId()) {
      case R.id.talk:
        tabHost.setCurrentTabByTag("take");
        break;
      case R.id.find:
        tabHost.setCurrentTabByTag("find");
        break;
      case R.id.me:
        tabHost.setCurrentTabByTag("me");
        break;
      case R.id.address:
        tabHost.setCurrentTabByTag("address");
        break;
      default:
        break;
      }
    } 

  }
}

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.android.xiong.bkclient"
  android:versionCode="1"
  android:versionName="1.0" > 

  <uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="19" /> 

  <application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity android:name="com.android.xiong.bkclient.MainActivity">
      <intent-filter>
        <action android:name="android.intent.action.MAIN" /> 

        <category android:name="android.intent.category.LAUNCHER" />
      </intent-filter>
    </activity>
    <activity android:name="com.android.xiong.bkclient.AddressActivity"></activity>
    <activity android:name="com.android.xiong.bkclient.FindActivity"></activity>
    <activity android:name="com.android.xiong.bkclient.MeActivity"></activity>
    <activity android:name="com.android.xiong.bkclient.TakeActivity"></activity>
  </application> 

</manifest>