Android(安卓)UI之Tab(TabActivity+TabHost实现)

Tab标签页是UI设计时经常使用的UI控件，可以实现多个分页之间的快速切换，每个分页可以显示不同的内容。

TabHost相当于浏览器中标签页分布的集合，而Tabspec则相当于浏览器中的每一个分页面。在Android中，每一个TabSpec分布可以是一个组件，也可以是一个布局，然后将每一个分页装入TabHost中，TabHost即可将其中的每一个分页一并显示出来。

使用Tab标签页的一般步骤：
首先要设计所有的分页的界面布局
Activity继承TabActivity
调用TabActivity的getTabHost()方法获得TabHost对象
通过TabHost创建并添加Tab

实例：TabDemo
运行效果：

代码清单：
布局文件：tab.xml

<?xml version="1.0" encoding="utf-8"?><FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent">    <TextView android:id="@+id/view1"        android:background="@drawable/blue"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:text="这里是Tab1里的内容。"/>    <TextView android:id="@+id/view2"        android:background="@drawable/red"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:text="这里是Tab2"/>    <TextView android:id="@+id/view3"        android:background="@drawable/green"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:text="Tab3"/></FrameLayout>

Java源代码文件：MainActivity.java

package com.rainsong.tabdemo;import android.app.TabActivity;import android.os.Bundle;import android.view.LayoutInflater;import android.widget.TabHost;public class MainActivity extends TabActivity{    TabHost mTabHost;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        mTabHost = getTabHost();        LayoutInflater.from(this).inflate(R.layout.tab,                mTabHost.getTabContentView(), true);        mTabHost.addTab(mTabHost.newTabSpec("tab1").setIndicator("Tab1")                .setContent(R.id.view1));        mTabHost.addTab(mTabHost.newTabSpec("tab3").setIndicator("Tab2")                .setContent(R.id.view2));        mTabHost.addTab(mTabHost.newTabSpec("tab3").setIndicator("Tab3")                .setContent(R.id.view3));    }}

API知识点
public class
TabActivity
extends ActivityGroup

TabHost getTabHost()
Returns the TabHost the activity is using to host its tabs.

public abstract class
LayoutInflater
extends Object

Class Overview
Instantiates a layout XML file into its corresponding View objects.

static LayoutInflater from(Context context)
Obtains the LayoutInflater from the given context.

View inflate(int resource, ViewGroup root, boolean attachToRoot)
Inflate a new view hierarchy from the specified xml resource.

public class
TabHost
extends FrameLayout
implements ViewTreeObserver.OnTouchModeChangeListener

Known Direct Subclasses
FragmentTabHost

Class Overview

Container for a tabbed window view. This object holds two children: a set of tab labels that the user clicks to select a specific tab, and a FrameLayout object that displays the contents of that page.

FrameLayout getTabContentView()
Get the FrameLayout which holds tab content

void addTab(TabHost.TabSpec tabSpec)
Add a tab.

TabHost.TabSpec newTabSpec(String tag)
Get a new TabHost.TabSpec associated with this tab host.

public class
TabHost.TabSpec
extends Object

Class Overview
A tab has a tab indicator, content, and a tag that is used to keep track of it.
This builder helps choose among these options.
For the tab indicator, your choices are:
1) set a label
2) set a label and an icon
For the tab content, your choices are:
1) the id of a View
2) a TabHost.TabContentFactory that creates the View content.
3) an Intent that launches an Activity.

TabHost.TabSpec setIndicator(CharSequence label)
Specify a label as the tab indicator.

TabHost.TabSpec setContent(int viewId)

Specify the id of the view that should be used as the content of the tab.

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