TabHost两种实现方式

第一种：继承TabActivity，从TabActivity中用getTabHost()方法获取TabHost。只要定义具体Tab内容布局就行了. 

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/FrameLayout01" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content">

     <TextView 
     android:id="@+id/TextView01" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="所有通话记录"></TextView>

     <TextView 
     android:id="@+id/TextView02" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="已接来电"></TextView>

     <TextView 
     android:id="@+id/TextView03" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="未接来电"></TextView>

 </FrameLayout>

package com.example.testtabhost;

import android.app.TabActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.widget.TabHost;
import android.widget.Toast;
import android.widget.TabHost.OnTabChangeListener;

public class MainActivity extends TabActivity {
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         TabHost th = getTabHost();
         //声明TabHost，然后用LayoutInflater过滤出布局来，给TabHost加上含有Tab页面的FrameLayout
     //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
     LayoutInflater.from(this).inflate(R.layout.activity_main, th.getTabContentView(), true); 
     //通过TabHost获得存放Tab标签页内容的FrameLayout，
     //newTabSpecd的作用是获取一个新的 TabHost.TabSpec，并关联到当前 TabHost
     //setIndicator的作用是指定标签和图标作为选项卡的指示符.
     //setContent的作用是指定用于显示选项卡内容的视图 ID.
         th.addTab(th.newTabSpec("all").setIndicator("所有通话记录", getResources().getDrawable(R.drawable.ic_launcher)).setContent(R.id.TextView01));
         th.addTab(th.newTabSpec("ok").setIndicator("已接来电",getResources().getDrawable(R.drawable.ic_launcher)).setContent(R.id.TextView02));
         th.addTab(th.newTabSpec("cancel").setIndicator("未接来电",getResources().getDrawable(R.drawable.ic_launcher)).setContent(R.id.TextView03));
         //setOnTabChangeListener的作业是注册一个回调函数，当任何一个选项卡的选中状态发生改变时调用.  
         th.setOnTabChangedListener(
            new OnTabChangeListener() {
                 @Override
                 public void onTabChanged(String tabId) {
                     Toast.makeText(MainActivity.this, tabId, Toast.LENGTH_LONG).show();
                 }
             }
         );       
     }
}

第二种：不用继承TabActivity，在布局文件中定义TabHost即可，但是TabWidget的id必须是 

@android:id/tabs，FrameLayout的id必须是@android:id/tabcontent。TabHost的id可以自定义. 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:id="@+id/hometabs"
    android:orientation="vertical"
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"> 
    <TabHost android:id="@+id/tabhost"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
        <LinearLayout
            android:orientation="vertical"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent">

            <TabWidget android:id="@android:id/tabs" 
              android:orientation="horizontal"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content">
            </TabWidget>

             <FrameLayout android:id="@android:id/tabcontent"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content">
                    <TextView android:id="@+id/view1"
                        android:layout_width="fill_parent"
                        android:layout_height="fill_parent"/>
                    <TextView android:id="@+id/view2"
                        android:layout_width="fill_parent"
                        android:layout_height="fill_parent"/>
                    <TextView android:id="@+id/view3"
                        android:layout_width="fill_parent"
                        android:layout_height="fill_parent"/>
             </FrameLayout>

         </LinearLayout>
    </TabHost>
</LinearLayout>

package com.example.testtabhost2;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TabHost;
import android.widget.TabWidget;

public class MainActivity extends Activity {

  private static final String TAG = "MainActivity";

  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

        TabHost tabHost = (TabHost) findViewById(R.id.tabhost);
        tabHost.setup();
        TabWidget tabWidget = tabHost.getTabWidget();

        tabHost.addTab(tabHost.newTabSpec("tab1")
                .setIndicator("tab1", getResources().getDrawable(R.drawable.ic_launcher))
                .setContent(R.id.view1));

        tabHost.addTab(tabHost.newTabSpec("tab3")
                .setIndicator("tab3")
                .setContent(R.id.view3));

        tabHost.addTab(tabHost.newTabSpec("tab2")
                .setIndicator("tab2")
                .setContent(R.id.view2));

        final int tabs = tabWidget.getChildCount();
        Log.i(TAG, "***tabWidget.getChildCount() : " + tabs);

        final int tabWidth = 90;
    final int tabHeight = 45;

    for (int i = 0; i < tabs; i++) {
    /*  final View view = tabWidget.getChildAt(i);
      view.getLayoutParams().width = tabWidth;
      view.getLayoutParams().height = tabHeight;
      final TextView tv = (TextView) view.findViewById(android.R.id.title);
        tv.setTextColor(this.getResources().getColorStateList(android.R.color.black));
        MarginLayoutParams tvMLP = (MarginLayoutParams)tv.getLayoutParams();
        tvMLP.bottomMargin = 8;*/
    }
  }

}