Android新浪微博开发（二）主UI的实现：动态建立TabActivity

仿照官网微博，设立5个窗口，这就需要TabActivity。动态建立TabActivity的步骤如下：

1 建立所需的Activity

跟官方的一样，也建5个，里面的先空着，别忘了最后要在配置文件中加上，并把启动的Activity改成下边的TabActivity

<activity android:name="HomeTimeLineActivity" android:label="My Weibo">
</activity>
<activity android:name="infoactivity"></activity>
<activity android:name="MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="moreweiboactivity"></activity>
<activity android:name="publicweiboactivity"></activity>
<activity android:name="useractivity"></activity>

2 在res/layout中新建xml文件

<?xml version="1.0" encoding="utf-8"?>
<TabHost android:id="@android:id/tabhost" xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:layout_height="fill_parent">

<FrameLayout android:id="@android:id/tabcontent"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:layout_weight="1.0" />

<TabWidget android:id="@android:id/tabs"
android:layout_width="fill_parent" android:layout_height="wrap_content"
android:layout_alignParentBottom="true" android:layout_gravity="bottom"></TabWidget>
</TabHost>

要注意各个ID，都是固定的，TabHost ，TabWidget ，FrameLayout的ID必须分别为@android:id/tabhost，@android:id/tabs，@android:id/tabcontent

3 建立一个从TabActivity继承来的类

import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TabHost;

public class MainActivity extends TabActivity {

private static final String WEIBO_HOME = "首页";
private static final String WEIBO_INFO = "信息";
private static final String WEIBO_USER = "我的资料";
private static final String WEIBO_PUBLIC = "广场";
private static final String WEIBO_MORE = "更多";

private TabHost tabhost;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.maintab);

tabhost = this.getTabHost();

TabHost.TabSpec tspec;
Intent it;

//加上首页的Activity
it = new Intent(MainActivity.this,HomeTimeLineActivity.class);
tspec = tabhost.newTabSpec(WEIBO_HOME).setIndicator(WEIBO_HOME).setContent(it);
tabhost.addTab(tspec);

//加上信息页
it = new Intent(MainActivity.this,infoactivity.class);
tspec = tabhost.newTabSpec(WEIBO_INFO).setIndicator(WEIBO_INFO).setContent(it);
tabhost.addTab(tspec);

//加上我的资料
it = new Intent(MainActivity.this,useractivity.class);
tspec = tabhost.newTabSpec(WEIBO_USER).setIndicator(WEIBO_USER).setContent(it);
tabhost.addTab(tspec);

//加上广场
it = new Intent(MainActivity.this,publicweiboactivity.class);
tspec = tabhost.newTabSpec(WEIBO_PUBLIC).setIndicator(WEIBO_PUBLIC).setContent(it);
tabhost.addTab(tspec);

//加上更多
it = new Intent(MainActivity.this,moreweiboactivity.class);
tspec = tabhost.newTabSpec(WEIBO_MORE).setIndicator(WEIBO_MORE).setContent(it);
tabhost.addTab(tspec);

//设置当前的Activity
tabhost.setCurrentTab(0);
}

}

看看效果



丑是丑了点，但基本效果是有的，谁让咱美工不行呢