自定义TabHost，TabWidget样式 .

大家好，今天我为大家分享TabHost中怎样修改TabWidget样式。在很多界面美观的应用中很多都用到了TabHost，但他们要比系统默认的要漂亮得多。先看几张图：

                             京东商城底部菜单栏

                            新浪微博底部菜单栏

   好了，看到这些漂亮的菜单栏是不是很惊讶，你可能会说用Button就可以实现啊 ，可是用Button的话控制显示的内容很麻烦，不如用TabHost控制效率更高。很想知道用TabHost是怎么实现的吧，下面就来研究如何实现这种漂亮的TabHost。先看一下效果图：

 

界面比较简单，要想做得漂亮换几张图片就可以了。

  第一步：先在布局（这里用了main.xml创建时自动生成的）里面放上TabHost ，只要将TabHost控件托至屏幕中就可：

<?xml version="1.0" encoding="utf-8"?>
    <TabHost android:id="@+id/tabhost"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      xmlns:android="http://schemas.android.com/apk/res/android">
        <LinearLayout android:layout_width="fill_parent"
          android:id="@+id/linearLayout1"
          android:layout_height="fill_parent"
          android:orientation="vertical">
            <TabWidget android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:id="@android:id/tabs"></TabWidget>
            <FrameLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@android:id/tabcontent">
                <LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/tab1"></LinearLayout>
                <LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/tab2"></LinearLayout>
                <LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/tab3"></LinearLayout>
            </FrameLayout>
        </LinearLayout>
    </TabHost>

<?xml version="1.0" encoding="utf-8"?>
    <TabHost android:id="@+id/tabhost" 
      android:layout_width="fill_parent" 
      android:layout_height="fill_parent" 
      xmlns:android="http://schemas.android.com/apk/res/android">
        <LinearLayout android:layout_width="fill_parent" 
          android:id="@+id/linearLayout1" 
          android:layout_height="fill_parent" 
          android:orientation="vertical">
            <TabWidget android:layout_width="fill_parent" 
              android:layout_height="wrap_content" 
              android:id="@android:id/tabs"></TabWidget>
            <FrameLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@android:id/tabcontent">
                <LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/tab1"></LinearLayout>
                <LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/tab2"></LinearLayout>
                <LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/tab3"></LinearLayout>
            </FrameLayout>
        </LinearLayout>
    </TabHost>

这里我们已经把LinearLayout和TextView去掉了，并将“xmlns:android="……" ”添加大TabHost里了，这里要注意我们将TabHost的id定义为自己定义的id比不用android规定的id="@android:id/tabhost"。

第二步：创建显示此TabWidget的布局tabmini.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="40dp"
    android:paddingLeft="5dip"
    android:paddingRight="5dip"
    android:background="@drawable/head_bg">

    <TextView android:id="@+id/tab_label"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:gravity="center"
        android:textColor="#000000"
        android:textStyle="bold"
        android:background="@drawable/tabmini"/>
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:layout_width="fill_parent"
    android:layout_height="40dp"
    android:paddingLeft="5dip"
    android:paddingRight="5dip"
    android:background="@drawable/head_bg">  
    
    <TextView android:id="@+id/tab_label"  
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:gravity="center"
        android:textColor="#000000"
        android:textStyle="bold"
        android:background="@drawable/tabmini"/> 
</RelativeLayout>

第三步：创建一个selector在drawable里面 命名tabmini.xml，用来点击TabHost的一个tab时TextView的变化：

<?xml version="1.0" encoding="utf-8"?>
<selector
  xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_selected="true"
        android:drawable="@drawable/add_managebg_down"/>
    <item android:state_selected="false"
        android:drawable="@drawable/add_managebg"/>
</selector>

<?xml version="1.0" encoding="utf-8"?>
<selector
  xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_selected="true"
        android:drawable="@drawable/add_managebg_down"/>
    <item android:state_selected="false"
        android:drawable="@drawable/add_managebg"/>
</selector>

第四步：在Activity里实现TabHost：

package cn.li.tabstyle;

import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.TabHost;
import android.widget.TextView;

public class TabHostStyleActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        View niTab = (View) LayoutInflater.from(this).inflate(R.layout.tabmini, null);
        TextView text0 = (TextView) niTab.findViewById(R.id.tab_label);
        text0.setText("ni");

        View woTab = (View) LayoutInflater.from(this).inflate(R.layout.tabmini, null);
        TextView text1 = (TextView) woTab.findViewById(R.id.tab_label);
        text1.setText("wo");

        View taTab = (View) LayoutInflater.from(this).inflate(R.layout.tabmini, null);
        TextView text2 = (TextView) taTab.findViewById(R.id.tab_label);
        text2.setText("ta");

        View weTab = (View) LayoutInflater.from(this).inflate(R.layout.tabmini, null);
        TextView text3 = (TextView) weTab.findViewById(R.id.tab_label);
        text3.setText("we");

        TabHost tabHost = (TabHost)findViewById(R.id.tabhost);
        tabHost.setup();   //Call setup() before adding tabs if loading TabHost using findViewById().

        tabHost.addTab(tabHost.newTabSpec("nitab").setIndicator(niTab).setContent(R.id.tab1));
        tabHost.addTab(tabHost.newTabSpec("wotab").setIndicator(woTab).setContent(R.id.tab2));
        tabHost.addTab(tabHost.newTabSpec("tatab").setIndicator(taTab).setContent(R.id.tab3));
        tabHost.addTab(tabHost.newTabSpec("wetab").setIndicator(weTab).setContent(R.id.tab4));
    }
}

package cn.li.tabstyle;

import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.TabHost;
import android.widget.TextView;

public class TabHostStyleActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        View niTab = (View) LayoutInflater.from(this).inflate(R.layout.tabmini, null);
        TextView text0 = (TextView) niTab.findViewById(R.id.tab_label);
        text0.setText("ni");
        
        View woTab = (View) LayoutInflater.from(this).inflate(R.layout.tabmini, null);
        TextView text1 = (TextView) woTab.findViewById(R.id.tab_label);
        text1.setText("wo");
        
        View taTab = (View) LayoutInflater.from(this).inflate(R.layout.tabmini, null);
        TextView text2 = (TextView) taTab.findViewById(R.id.tab_label);
        text2.setText("ta");
        
        View weTab = (View) LayoutInflater.from(this).inflate(R.layout.tabmini, null);
        TextView text3 = (TextView) weTab.findViewById(R.id.tab_label);
        text3.setText("we");
        
        TabHost tabHost = (TabHost)findViewById(R.id.tabhost);
        tabHost.setup();   //Call setup() before adding tabs if loading TabHost using findViewById(). 
        
        tabHost.addTab(tabHost.newTabSpec("nitab").setIndicator(niTab).setContent(R.id.tab1));
        tabHost.addTab(tabHost.newTabSpec("wotab").setIndicator(woTab).setContent(R.id.tab2));
        tabHost.addTab(tabHost.newTabSpec("tatab").setIndicator(taTab).setContent(R.id.tab3));
        tabHost.addTab(tabHost.newTabSpec("wetab").setIndicator(weTab).setContent(R.id.tab4));
    }
}

这里我们用findViewById创建了TabHost，这样的话我们就需要在添加tab时调用TabHost的setup()方法；这里我们添加内容时添加的是布局，我们完全可以换成自己创建的Activity。

好了，让我们来看看运行效果吧：

好了，我们自定义的TabHost算是结束了。不过看到Activity里的代码很多都是重复的我们可以这样把他们简化：

package cn.li.tabstyle;

import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.TabHost;
import android.widget.TextView;

public class TabHostStyleActivity extends Activity {
    /** Called when the activity is first created. */
    String[] title = new String[]{"ni","wo","ta","we"};
    View userTab,articeTab,feedTab,weTab;
    View[] tabs = new View[]{userTab,articeTab,feedTab,weTab};
    int[] tabIds = new int[]{R.id.tab1,R.id.tab2,R.id.tab3,R.id.tab4};
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        TabHost tabHost = (TabHost)findViewById(R.id.tabhost);
        tabHost.setup();   //Call setup() before adding tabs if loading TabHost using findViewById().

        for(int i=0;i<tabs.length;i++){
            tabs[i] = (View) LayoutInflater.from(this).inflate(R.layout.tabmini, null);
            TextView text = (TextView) tabs[i].findViewById(R.id.tab_label);
            text.setText(title[i]);
            tabHost.addTab(tabHost.newTabSpec(title[i]).setIndicator(tabs[i]).setContent(tabIds[i]));
        }
    }
}

package cn.li.tabstyle;

import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.TabHost;
import android.widget.TextView;

public class TabHostStyleActivity extends Activity {
    /** Called when the activity is first created. */
	String[] title = new String[]{"ni","wo","ta","we"};
	View userTab,articeTab,feedTab,weTab;
	View[] tabs = new View[]{userTab,articeTab,feedTab,weTab};
	int[] tabIds = new int[]{R.id.tab1,R.id.tab2,R.id.tab3,R.id.tab4};
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        TabHost tabHost = (TabHost)findViewById(R.id.tabhost);
        tabHost.setup();   //Call setup() before adding tabs if loading TabHost using findViewById(). 
        
        for(int i=0;i<tabs.length;i++){
        	tabs[i] = (View) LayoutInflater.from(this).inflate(R.layout.tabmini, null);
            TextView text = (TextView) tabs[i].findViewById(R.id.tab_label);
            text.setText(title[i]);            
            tabHost.addTab(tabHost.newTabSpec(title[i]).setIndicator(tabs[i]).setContent(tabIds[i]));
        }
    }
}