TabHost Tab的添加和删除

2023-10-16 16:49:34

TabHost 添加Tab项：

        tabhost = this.getTabHost();  
  
        TabSpec tabSpec = tabhost.newTabSpec("news");  
        tabSpec.setIndicator("新闻");  
        tabSpec.setContent(new Intent(this, NewsActivity.class));  
        tabhost.addTab(tabSpec);  
  
        TabSpec tabSpec2 = tabhost.newTabSpec("fun");  
        tabSpec2.setIndicator("娱乐");  
        tabSpec2.setContent(new Intent(this,FunActivity.class));  
        tabhost.addTab(tabSpec2);  
  
        TabSpec tabSpec3 = tabhost.newTabSpec("sport");  
        tabSpec3.setIndicator("体育");  
        tabSpec3.setContent(new Intent(this,SportsActivity.class));  
        tabhost.addTab(tabSpec3);  
  
        TabSpec tabSpec4 = tabhost.newTabSpec("setting");  
        tabSpec4.setIndicator("设置");  
        tabSpec4.setContent(new Intent(this, SettingActivity.class));  
        tabhost.addTab(tabSpec4);

TabHost删除Tab项

mTabHost.getTabWidget().removeViewAt(mTabHost.getCurrentTab());

这样删除会有问题。

只能通过删除所有Tab项然后再依次添加。需要注意在调用clearAllTabs（）方法之前，需要设置当前显示的tab,即setCurrentTab(0),否则出现空指针问题。

完整代码如下:

                tabhost.setCurrentTab(0);  
                tabhost.clearAllTabs();  
              
                TabSpec tabSpec = tabhost.newTabSpec("news");  
                tabSpec.setIndicator("新闻");  
                tabSpec.setContent(new Intent(this,  
                        NewsActivity.class));  
                tabhost.addTab(tabSpec);  
  
                TabSpec tabSpec2 = tabhost.newTabSpec("fun");  
                tabSpec2.setIndicator("娱乐");  
                tabSpec2.setContent(new Intent(this,  
                        FunActivity.class));  
                tabhost.addTab(tabSpec2);  
  
                TabSpec tabSpec3 = tabhost.newTabSpec("sport");  
                tabSpec3.setIndicator("体育");  
                tabSpec3.setContent(new Intent(this,  
                        SportActivity.class));  
                tabhost.addTab(tabSpec3);  
  
                TabSpec tabSpec4 = tabhost.newTabSpec("setting");  
                tabSpec4.setIndicator("设置");  
                tabSpec4.setContent(new Intent(EarthActivity.this,  
                        SettingActivity.class));  
                tabhost.addTab(tabSpec4);  
  
                tabhost.setCurrentTab(2);

Android上下TabHost设置及Did you forget to call ‘public void setup(LocalActivityManager activityGroup)解决方法

先来一张效果图：

下面是xml文件：

首先是第一个activity_main.xml,实现tab在下面的效果：

<RelativeLayout 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" >  
  
    <TabHost  
        android:id="@+id/maintabhost"  
        android:layout_width="fill_parent"  
        android:layout_height="match_parent"  
        android:layout_alignParentLeft="true"  
        android:layout_centerVertical="true" >  
  
        <LinearLayout  
            android:layout_width="match_parent"  
            android:layout_height="match_parent"  
            android:orientation="vertical" >  
            <!-- 此处FrameLayout和TabWidget的位置注意一下，TabWidget在FrameLayout之下，并且FrameLayout要设置一下权重这个属性 android:layout_weight="1" 这样才能实现tab在下面的效果 -->  
            <FrameLayout  
                android:id="@android:id/tabcontent"  
                android:layout_width="fill_parent"  
                android:layout_height="0dip"  
                android:layout_weight="1" >  
            </FrameLayout>  
  
            <TabWidget  
                android:id="@android:id/tabs"  
                android:layout_width="fill_parent"  
                android:layout_height="wrap_content" >  
            </TabWidget>  
        </LinearLayout>  
    </TabHost>  
  
</RelativeLayout>

下面是主Activity:

我这里继承ActivityGroup而不是继承Activity，是因为我在写代码的时候报了如下的异常： java.lang.IllegalStateException: Did you forget to call ‘public void setup(LocalActivityManager activityGroup)‘? ，代码里有我解决方法（也就是继承ActivityGroup，再加上一行代码就行），你也可以先继承Activity看看会不会报这个异常，如果报了的话再改成这个。

public class WeiBoActivity extends ActivityGroup {  
  
    private TabHost mTabHost = null;  
  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        requestWindowFeature(Window.FEATURE_NO_TITLE);  
        setContentView(R.layout.weibo_main);  
                  
        mTabHost = (TabHost) findViewById(R.id.maintabhost);  
        mTabHost.setup();  
          
        // 此处是我解决异常加的一行代码,如果继承Activity的话可将此行注释  
        mTabHost.setup(this.getLocalActivityManager());  
          
        mTabHost.addTab(mTabHost.newTabSpec("t1").setIndicator("首页")  
                .setContent(R.id.tab1));  
        mTabHost.addTab(mTabHost.newTabSpec("t2").setIndicator("消息")  
                .setContent(new Intent(this, MessageActivity.class)));  
        mTabHost.addTab(mTabHost.newTabSpec("t3").setIndicator("好友")  
                .setContent(R.id.tab3));  
        mTabHost.addTab(mTabHost.newTabSpec("t4").setIndicator("广场")  
                .setContent(R.id.tab4));  
  
    }  
  
}

下面是跳转界面的weibo_message.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" >  
    <!-- 此处TabHost的id自已定义 -->  
    <TabHost  
        android:id="@+id/msgstabhost"  
        android:layout_width="match_parent"  
        android:layout_height="match_parent" >  
  
        <LinearLayout  
            android:layout_width="match_parent"  
            android:layout_height="match_parent"  
            android:orientation="vertical" >  
  
            <TabWidget  
                android:id="@android:id/tabs"  
                android:layout_width="match_parent"  
                android:layout_height="wrap_content" >  
            </TabWidget>  
  
            <FrameLayout  
                android:id="@android:id/tabcontent"  
                android:layout_width="match_parent"  
                android:layout_height="match_parent" >  
            </FrameLayout>  
        </LinearLayout>  
    </TabHost>  
  
</LinearLayout>

下面是跳转的Activity，依然继承ActivityGroup:

public class MessageActivity extends ActivityGroup {  
  
    private TabHost mTabHostMsg;  
  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        // TODO Auto-generated method stub  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.weibo_message);  
  
        mTabHostMsg = (TabHost) this.findViewById(R.id.msgstabhost);  
        mTabHostMsg.setup();  
          
        mTabHostMsg.setup(this.getLocalActivityManager());  
          
        mTabHostMsg.addTab(mTabHostMsg.newTabSpec("t5").setIndicator("系统消息")  
                .setContent(R.id.msgtab5));  
        mTabHostMsg.addTab(mTabHostMsg.newTabSpec("t6").setIndicator("评论")  
                .setContent(R.id.msgtab6));  
        mTabHostMsg.addTab(mTabHostMsg.newTabSpec("t7").setIndicator("私信")  
                .setContent(R.id.msgtab7));  
    }  
  
}

TabHost Tab的添加和删除

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