学步园

简介

Android程序的主入口，类似于J2EE项目中的web.xml，定义了程序的内容和行为。

代码

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.duanyr.sinaweibotabhost"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <!-- Android程序主入口，调用MainActivity -->
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <!-- 注册项目用到的多个Activity -->
        <activity android:name=".HomeActivity" />
        <activity android:name=".MessageActivity" />
        <activity android:name=".InfoActivity" />
    </application>

</manifest>

package com.duanyr.sinaweibotabhost;

import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Window;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.RadioButton;
import android.widget.TabHost;

/**
 * @author： duanyr 
 * @创建时间： 2012-11-12 下午4:02:00 
 * 
 * 类说明：仿新浪微博底部TabHost实现
 */
public class MainActivity extends TabActivity implements
		OnCheckedChangeListener {

	private TabHost tabHost;
	private Intent homeIntent;
	private Intent messageIntent;
	private Intent infoIntent;

	/**
	 * 重写Activity的onCreate方法
	 * 该方法当程序启动时，切换横竖屏时，再次启动时运行
	 */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		//不显示title
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.activity_main);

		// ~~~~~~~~~~~~ 初始化~~~~~~~~~~//
		this.homeIntent = new Intent(this, HomeActivity.class);
		this.messageIntent = new Intent(this, MessageActivity.class);
		this.infoIntent = new Intent(this, InfoActivity.class);

		initRadios();//初始化底部按钮
		setupIntent();//绑定选项卡数据
	}

	/**
	 * 初始化底部按钮
	 */
	private void initRadios() {
		((RadioButton) findViewById(R.id.radio_btn_home))
				.setOnCheckedChangeListener(this);
		((RadioButton) findViewById(R.id.radio_btn_message))
				.setOnCheckedChangeListener(this);
		((RadioButton) findViewById(R.id.radio_btn_info))
				.setOnCheckedChangeListener(this);
	}

	/**
	 * 底部按钮改变是调用的方法
	 */
	public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
		if (isChecked) {
			switch (buttonView.getId()) {
			case R.id.radio_btn_home:
				this.tabHost.setCurrentTabByTag("home_tab");
				break;
			case R.id.radio_btn_message:
				this.tabHost.setCurrentTabByTag("message_tab");
				break;
			case R.id.radio_btn_info:
				this.tabHost.setCurrentTabByTag("info_tab");
				break;
			}
		}
	}

	/**
	 * 绑定各个选项卡数据内容
	 */
	private void setupIntent() {
		this.tabHost = getTabHost();
		TabHost localTabHost = this.tabHost;

		localTabHost.addTab(buildTabSpec("home_tab", R.string.main_home,
				R.drawable.icon_home, this.homeIntent));

		localTabHost.addTab(buildTabSpec("message_tab", R.string.main_message,
				R.drawable.icon_message, this.messageIntent));

		localTabHost.addTab(buildTabSpec("info_tab", R.string.main_info,
				R.drawable.icon_info, this.infoIntent));

	}

	private TabHost.TabSpec buildTabSpec(String tag, int resLabel, int resIcon,
			final Intent content) {
		return this.tabHost
				.newTabSpec(tag)
				.setIndicator(getString(resLabel),
						getResources().getDrawable(resIcon))
				.setContent(content);
	}

}

package com.duanyr.sinaweibotabhost;

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

public class MessageActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_message);
    }

}

activity_message.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TextView
        android:id="@+id/my_info"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/main_message" />

</LinearLayout>

<resources>
    <string name="app_name">SinaWeiboTabHost</string>
    <string name="menu_settings">Settings</string>
    <string name="title_activity_main">MainActivity</string>
    <string name="main_home">主页</string>
    <string name="main_message">消息</string>
    <string name="main_info">个人资料</string>
</resources>

Styles.xml

<resources>

    <style name="AppTheme" parent="android:Theme.Light" />

    <style name="main_tab_bottom">
        <item name="android:textSize">10.0dip</item>
        <item name="android:textColor">#ffffffff</item>
        <item name="android:ellipsize">marquee</item>
        <item name="android:gravity">center_horizontal</item>
        <item name="android:background">@drawable/home_btn_bg</item>
		<item name="android:paddingTop">5.0dip</item>
        <item name="android:layout_width">fill_parent</item>
        <item name="android:layout_height">wrap_content</item>
        <item name="android:button">@null</item>
        <item name="android:singleLine">true</item>
       	<item name="android:drawablePadding">2.0dip</item>
        <item name="android:layout_weight">1.0</item>
    </style>
</resources>

还有部分图片资源不方便上传，具体项目已经上传到资源库中，地址为：http://download.csdn.net/detail/duanyanrui/4759463，欢迎大家下载。此代码有借鉴网友的代码资料，在此谢谢各位网友的不吝赐教，项目有不当之处还请大家多多指教。