浅谈Android切换卡TabWidget应用

<?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="fill_parent" 
    android:layout_height="fill_parent"> 
    <LinearLayout 
        android:orientation="vertical" 
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent"> 
        <TabWidget 
            android:id="@android:id/tabs" 
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content" /> 
        <FrameLayout 
            android:id="@android:id/tabcontent" 
            android:layout_width="fill_parent" 
            android:layout_height="fill_parent"> 
            <TextView 
                android:id="@+id/textview1" 
                android:layout_width="fill_parent" 
                android:layout_height="fill_parent" 
                android:text="this is a tab" /> 
            <TextView 
                android:id="@+id/textview2" 
                android:layout_width="fill_parent" 
                android:layout_height="fill_parent" 
                android:text="this is another tab" /> 
            <TextView 
                android:id="@+id/textview3" 
                android:layout_width="fill_parent" 
                android:layout_height="fill_parent" 
                android:text="this is a third tab" /> 
        </FrameLayout> 
    </LinearLayout> 
</TabHost> 
 
源代码：  
package com.yarin.android.TestOnWidget;  
 
import android.app.AlertDialog;  
import android.app.Dialog;  
import android.app.TabActivity;  
import android.content.DialogInterface;  
import android.graphics.Color;  
import android.os.Bundle;  
import android.widget.TabHost;  
import android.widget.TabHost.OnTabChangeListener;  
 
public class mytestWidget extends TabActivity  
{  
    //声明TabHost对象  
    TabHost mTabHost;  
     
    @Override  
    public void onCreate(Bundle savedInstanceState)  
    {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
         
        //取得TabHost对象  
        mTabHost = getTabHost();  
         
         
        //新建一个newTabSpec(newTabSpec)  
        //设置其标签和图标(setIndicator)  
        //设置内容(setContent)  
        mTabHost.addTab(mTabHost.newTabSpec("tab_test1")  
                .setIndicator("TAB 1",getResources().getDrawable(R.drawable.img1))  
                .setContent(R.id.textview1));  
        mTabHost.addTab(mTabHost.newTabSpec("tab_test2")  
                .setIndicator("TAB 2",getResources().getDrawable(R.drawable.img2))  
                .setContent(R.id.textview2));  
        mTabHost.addTab(mTabHost.newTabSpec("tab_test3")  
                .setIndicator("TAB 3",getResources().getDrawable(R.drawable.img3))  
                .setContent(R.id.textview3));  
         
        //设置TabHost的背景颜色  
        mTabHost.setBackgroundColor(Color.argb(150, 22, 70, 150));  
        //设置TabHost的背景图片资源  
        //mTabHost.setBackgroundResource(R.drawable.bg0);  
         
        //设置当前显示哪一个标签  
        mTabHost.setCurrentTab(0);  
         
        //标签切换事件处理，setOnTabChangedListener  
        mTabHost.setOnTabChangedListener(new OnTabChangeListener()  
        {  
            // TODO Auto-generated method stub  
            @Override  
            public void onTabChanged(String tabId)  
            {  
                    Dialog dialog = new AlertDialog.Builder(mytestWidget.this)  
                            .setTitle("提示")  
                            .setMessage("当前选中："+tabId+"标签")  
                            .setPositiveButton("确定",  
                            new DialogInterface.OnClickListener()  
                            {  
                                public void onClick(DialogInterface dialog, int whichButton)  
                                {  
                                    dialog.cancel();  
                                }  
                            }).create();//创建按钮  
               
                    dialog.show();  
            }             
        });  
    }  
} 
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