使用TabHost的一般步骤：
(1)在界面中定义TabHost组件，为该组件定义选项卡内容
(2)Activity继承TabActivity（已经过时，现在用Fragment代替）
(3)调用TabActivity的getTabHost()方法获得TabHost对象
(4)通过TabHost对象的方法来创建添加选项卡
使用TabHost时有两种情况：一种直接把内容写在TablHost里面，一种可以写在另外的Layout中，在TabHost中引用
此次示例采用第二种方法：
示例：
首先定义三个布局文件：
tab1
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/tab1">
<ViewSwitcher
android:id="@+id/viewSwitcher1"
android:layout_width="match_parent"
android:layout_height="400dp"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<Button
android:id="@+id/butten_prev"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="上一页"
android:onClick="prev"/>
<Button
android:id="@+id/butten_next"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="下一页"
android:onClick="next"
/>
</LinearLayout>
</LnearLayout>tab2
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/tab2">
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="send"
android:text="发送通知"/>
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="cancel"
android:text="取消发送"/>
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="openanother"
android:text="打开另一个activity"/>
</LinearLayout>tab3
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/tab3">
<ImageView
android:id="@+id/imageView2"
android:layout_width="300dp"
android:layout_height="300dp"
android:src="@drawable/img1"/>
<SeekBar
android:id="@+id/seekBar"
android:layout_width="368dp"
android:layout_height="wrap_content"
android:max="255"
android:progress="255"
android:layout_marginLeft="0dp"/>
<RatingBar
android:id="@+id/ratingBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:numStars="5"
android:stepSize="0.5"
android:rating="5"/>
</LinearLayout>MainActivity：
public class MainActivity extends TabActivity{
//tab1
private ViewSwitcher viewSwitcher;
private int[] images = new int[]{R.drawable.img1,R.drawable.img2,
R.drawable.img3,R.drawable.img4,R.drawable.img5};
private int index = 0;
private LayoutInflater inflater;
//tab2
private static final int NOTIVICATIONID=0x123;
private NotificationManager manager;
private Intent intent;
//tab3
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(getTabHost());
TabHost host = getTabHost();
LayoutInflater.from(this).inflate(R.layout.tab1,host.getTabContentView(),true);
LayoutInflater.from(this).inflate(R.layout.tab2,host.getTabContentView(),true);
LayoutInflater.from(this).inflate(R.layout.tab3,host.getTabContentView(),true);
host.addTab(host.newTabSpec("tab1").setIndicator("相册").setContent(R.id.tab1));
host.addTab(host.newTabSpec("tab2").setIndicator("发送信息").setContent(R.id.tab2));
host.addTab(host.newTabSpec("tab3").setIndicator("透明度").setContent(R.id.tab3));
//tab1
viewSwitcher=(ViewSwitcher)findViewById(R.id.viewSwitcher1);
inflater = LayoutInflater.from(this);
viewSwitcher.setFactory(new ViewSwitcher.ViewFactory() {
@Override
public View makeView() {
ImageView imageView = new ImageView(getApplicationContext());
return imageView;
}
});
viewSwitcher.setInAnimation(this, android.R.anim.slide_in_left);
viewSwitcher.setOutAnimation(this,android.R.anim.slide_out_right);
next(null);
//tab2
manager=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);
//tab3
final ImageView imageView = (ImageView)findViewById(R.id.imageView2);
final SeekBar seekBar = (SeekBar)findViewById(R.id.seekBar);
final RatingBar ratingBar = (RatingBar)findViewById(R.id.ratingBar);
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
imageView.setImageAlpha(i);
ratingBar.setRating(i*5.0f/255);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
ratingBar.setOnRatingBarChangeListener(new RatingBar.OnRatingBarChangeListener() {
@Override
public void onRatingChanged(RatingBar ratingBar, float v, boolean b) {
imageView.setImageAlpha((int)v*255/5);
seekBar.setProgress((int)v*255/5);
}
});
}
//tab1
public void prev(View view){
index--;
if (index<0)
index=images.length-1;
ImageView imageView = (ImageView)viewSwitcher.getNextView();
imageView.setImageResource(images[index]);
viewSwitcher.showPrevious();
}
public void next(View view){
index++;
if (index>images.length-1)
index=0;
ImageView imageView = (ImageView)viewSwitcher.getNextView();
imageView.setImageResource(images[index]);
viewSwitcher.showNext();
}
//tab2
public void send(View view){
intent = new Intent(this,MainActivity.class);
PendingIntent pi = PendingIntent.getActivity(getApplicationContext(),0,intent,0);
NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
builder.setAutoCancel(true)
.setTicker("中午加餐啦")
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle("今天牛老板请客")
.setContentText("牛老板请客吃烧烤")
.setDefaults(Notification.DEFAULT_ALL)
.setContentIntent(pi)
.build();
Notification notify = builder.build();
manager.notify(NOTIVICATIONID,notify);
}
public void cancel(View view){
manager.cancel(NOTIVICATIONID);
}
public void openanother(View view){
startActivity(intent);
}
}