Android切换卡TabWidget用法示例

package org.hualang.tab;
import android.app.Activity;
import android.app.TabActivity;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.TabHost;
import android.widget.Toast;
import android.widget.TabHost.OnTabChangeListener;
public class TabTest extends TabActivity {
  /** Called when the activity is first created. */
  TabHost tabhost;
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    //取得TabHost对象
    tabhost = getTabHost();
    //为TabHost添加标签
    //新建一个newTabSpec(newTabSpec)
    //设置其标签和图标（setIndicator）
    //设置内容（setContent）
    tabhost.addTab(tabhost.newTabSpec("tab1")
        .setIndicator("TAB 1",getResources().getDrawable(R.drawable.img1))
        .setContent(R.id.text1));
    tabhost.addTab(tabhost.newTabSpec("tab2")
        .setIndicator("TAB 2",getResources().getDrawable(R.drawable.img2))
        .setContent(R.id.text2));
    tabhost.addTab(tabhost.newTabSpec("tab3")
        .setIndicator("TAB 3",getResources().getDrawable(R.drawable.img3))
        .setContent(R.id.text3));
    //设置TabHost的背景颜色
    //tabhost.setBackgroundColor(Color.argb(150,22,70,150));
    //设置TabHost的背景图片资源
    tabhost.setBackgroundResource(R.drawable.bg0);
    //设置当前显示哪个标签
    tabhost.setCurrentTab(0);
    //标签切换事件处理，setOnTabChangedListener
    tabhost.setOnTabChangedListener(new OnTabChangeListener()
    {
      public void onTabChanged(String tabId)
      {
        Toast toast=Toast.makeText(getApplicationContext(), "现在是"+tabId+"标签", Toast.LENGTH_SHORT);
        toast.show();
      }
    });
  }
}

<?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/text1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:text="选项卡1" />
      <TextView
        android:id="@+id/text2"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:text="选项卡2" />
      <TextView
        android:id="@+id/text3"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:text="选项卡3" />
    </FrameLayout>
  </LinearLayout>
</TabHost>