Android之UI学习篇十：使用TabHost实现微博客户端界面

这里模拟微博客户端进行案例开发，由于没有图片资源，所以就做了一个大体结构类似的案例，跟大家分享一下它的实现，这里采用的是使用xml布局结合TabActivity控制。

先看看实现的效果：

工程目录结构：

以下是源代码：

MainActivity.java

package com.tablehost.activity;

import android.app.Activity;
import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.speech.SpeechRecognizer;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TabHost;
import android.widget.TabHost.TabSpec;

public class MainActivity extends TabActivity implements OnCheckedChangeListener{
	private TabHost tabHost;
	private RadioGroup radioGroup;
	private RadioButton radioButton1;
	private RadioButton radioButton2;
	private RadioButton radioButton3;
	private RadioButton radioButton4;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //获取TabHost组件
        tabHost = getTabHost();
        //新建一个标签页
        TabSpec tabSpec1 = (TabSpec)tabHost.newTabSpec("HOME").setIndicator("HOME");
        //给标签页设置内容
        tabSpec1.setContent(new Intent(MainActivity.this,HomeActivity.class));
        //把标签页添加到TabHost当中去
        tabHost.addTab(tabSpec1);
        
        TabSpec tabSpec2 = (TabSpec)tabHost.newTabSpec("COMMENT").setIndicator("COMMENT");
        tabSpec2.setContent(new Intent(MainActivity.this,CommentActivity.class));
        tabHost.addTab(tabSpec2);
        
        TabSpec tabSpec3 = (TabSpec)tabHost.newTabSpec("SAVE").setIndicator("SAVE");
        tabSpec3.setContent(new Intent(MainActivity.this,SaveActivity.class));
        tabHost.addTab(tabSpec3);
        
        TabSpec tabSpec4 = (TabSpec)tabHost.newTabSpec("MORE").setIndicator("MORE");
        tabSpec4.setContent(new Intent(MainActivity.this,MoreActivity.class));
        tabHost.addTab(tabSpec4);
        
        setUpView();
        //关联RadioButton 和 TabHost
        radioGroup.setOnCheckedChangeListener(this);
    }
    //我的一贯作风
    public void setUpView(){
    	radioGroup = (RadioGroup)findViewById(R.id.group);
    	radioButton1 = (RadioButton)findViewById(R.id.radioButton1);
    	radioButton2 = (RadioButton)findViewById(R.id.radioButton2);
    	radioButton3 = (RadioButton)findViewById(R.id.radioButton3);
    	radioButton4 = (RadioButton)findViewById(R.id.radioButton4);
    }
	@Override
	public void onCheckedChanged(RadioGroup group, int checkedId) {
		switch (checkedId) {
		case R.id.radioButton1:
			tabHost.setCurrentTabByTag("HOME");
			break;
		case R.id.radioButton2:
			tabHost.setCurrentTabByTag("COMMENT");
			break;
		case R.id.radioButton3:
			tabHost.setCurrentTabByTag("SAVE");
			break;
		case R.id.radioButton4:
			tabHost.setCurrentTabByTag("MORE");
			break;
		default:
			break;
		}
	}
}
           

CommentActivity.java:

package com.tablehost.activity;

import android.app.Activity;
import android.os.Bundle;

public class CommentActivity extends Activity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.comment);
	}
}
           

其他几个Activity类似

在工程的src 目录下新建了一个目录： drawable ,里面新建一个button.xml,用来定义radioButton的选中等不同状态时，显示不同的背景图片：

button.xml:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- 当单选框可用，且获得焦点还没有按下显示的背景 -->
    <item android:state_enabled="true" android:state_focused="true" 
        android:state_pressed="false" android:drawable="@drawable/home_btn_bg_s">
    </item>
    
    <!-- 当单选框可用，且被按下时显示的背景 -->
    <item android:state_enabled="true" android:state_pressed="true"
        android:drawable="@drawable/home_btn_bg_s">
    </item>
    
    <!-- 当单选框可用，且被选中了时的背景 -->
    <item android:state_enabled="true" android:state_checked="true"
        android:drawable="@drawable/home_btn_bg_d">
    </item>
    
</selector>
           

main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
	<!-- TabHost的id写固定值，在Activity通过getTabHost()方法才能取得到 -->
    <TabHost 
        android:id="@android:id/tabhost"
        android:layout_width="fill_parent"
    	android:layout_height="fill_parent">
    	<!-- 放置frame视图和标签页 -->
        <LinearLayout 
            android:layout_width="fill_parent"
    		android:layout_height="fill_parent"
    		android:orientation="vertical">
            <FrameLayout 
                android:id="@android:id/tabcontent"
                android:layout_width="fill_parent"
    			android:layout_height="wrap_content"
    			android:layout_weight="1.0">
            </FrameLayout>
            <TabWidget 
                android:id="@android:id/tabs"
                android:layout_width="fill_parent"
    			android:layout_height="wrap_content"
    			android:visibility="gone">
            </TabWidget>
            <RadioGroup 
                android:id="@+id/group"
                android:layout_width="fill_parent"
    			android:layout_height="50dp"
    			android:background="@drawable/tab_bg"
    			android:gravity="center_vertical"
    			android:orientation="horizontal">
    			<RadioButton 
    			     android:id="@+id/radioButton1"
    			     android:layout_width="fill_parent"
    			     android:layout_height="wrap_content"
    			     android:button="@null"
    			     android:text="@string/home"
    			     android:drawableTop="@drawable/icon_1_n"
    			     android:gravity="center_horizontal"
    			     android:background="@drawable/button"
    			     android:layout_weight="1"
    			     android:checked="true"/>
    			
    			<RadioButton 
    			     android:id="@+id/radioButton2"
    			     android:layout_width="fill_parent"
    			     android:layout_height="wrap_content"
    			     android:button="@null"
    			     android:text="@string/comment"
    			     android:drawableTop="@drawable/icon_2_n"
    			     android:gravity="center_horizontal"
    			     android:background="@drawable/button"
    			     android:layout_weight="1"/>
    			
    			<RadioButton 
    			     android:id="@+id/radioButton3"
    			     android:layout_width="fill_parent"
    			     android:layout_height="wrap_content"
    			     android:button="@null"
    			     android:text="@string/save"
    			     android:drawableTop="@drawable/icon_3_n"
    			     android:gravity="center_horizontal"
    			     android:background="@drawable/button"
    			     android:layout_weight="1"/>
    			
    			<RadioButton 
    			     android:id="@+id/radioButton4"
    			     android:layout_width="fill_parent"
    			     android:layout_height="wrap_content"
    			     android:button="@null"
    			     android:text="@string/more"
    			     android:drawableTop="@drawable/icon_4_n"
    			     android:gravity="center_horizontal"
    			     android:background="@drawable/button"
    			     android:layout_weight="1"/>
            </RadioGroup>
        </LinearLayout>
    </TabHost>

</LinearLayout>
           

comment.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:background="@drawable/b">

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Hello world! CommentActivty" />

</LinearLayout>
           

其他几个布局文件相似。