【Android UI设计与开发】第08期：底部菜单栏（三）Fragment+FragmentTabHost实现仿新浪微博底部菜单栏

<?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" >

    <FrameLayout
        android:id="@+id/realtabcontent"
        android:layout_width="fill_parent"
        android:layout_height="0dip"
        android:layout_weight="1" />

    <android.support.v4.app.FragmentTabHost
        android:id="@android:id/tabhost"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" 
        android:background="@drawable/maintab_toolbar_bg">

        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_weight="0" />            
    </android.support.v4.app.FragmentTabHost>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/imageview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:focusable="false"
        android:padding="3dp" 
        android:src="@drawable/tab_home_btn">
    </ImageView>

    <TextView
        android:id="@+id/textview"       
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:text="首页"
        android:textSize="10sp"
        android:textColor="#ffffff">
    </TextView>

</LinearLayout>

<span style="font-size:12px;"><?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" >

    <ImageView
        android:id="@+id/imageview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:scaleType="fitCenter"
        android:src="@drawable/xianjian01" >
    </ImageView>

</LinearLayout></span>

<span style="font-size:12px;"><?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/icon_home_sel" android:state_selected="true"/>
    <item android:drawable="@drawable/icon_home_nor"/>

</selector></span>

<span style="font-size:12px;"><?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/home_btn_bg" android:state_pressed="true"/>
    <item android:drawable="@drawable/home_btn_bg" android:state_selected="true"/>

</selector></span>

<span style="font-size:12px;">package com.yangyu.mycustomtab02;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTabHost;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ImageView;
import android.widget.TabHost.TabSpec;
import android.widget.TextView;

/**
 * @author yangyu
 *    功能描述：自定义TabHost
 */
public class MainTabActivity extends FragmentActivity{    
    //定义FragmentTabHost对象
    private FragmentTabHost mTabHost;
    
    //定义一个布局
    private LayoutInflater layoutInflater;
        
    //定义数组来存放Fragment界面
    private Class fragmentArray[] = {FragmentPage1.class,FragmentPage2.class,FragmentPage3.class,FragmentPage4.class,FragmentPage5.class};
    
    //定义数组来存放按钮图片
    private int mImageViewArray[] = {R.drawable.tab_home_btn,R.drawable.tab_message_btn,R.drawable.tab_selfinfo_btn,
                                     R.drawable.tab_square_btn,R.drawable.tab_more_btn};
    
    //Tab选项卡的文字
    private String mTextviewArray[] = {"首页", "消息", "好友", "广场", "更多"};
    
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_tab_layout);
        
        initView();
    }
     
    /**
     * 初始化组件
     */
    private void initView(){
        //实例化布局对象
        layoutInflater = LayoutInflater.from(this);
                
        //实例化TabHost对象，得到TabHost
        mTabHost = (FragmentTabHost)findViewById(android.R.id.tabhost);
        mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);    
        
        //得到fragment的个数
        int count = fragmentArray.length;    
                
        for(int i = 0; i < count; i++){    
            //为每一个Tab按钮设置图标、文字和内容
            TabSpec tabSpec = mTabHost.newTabSpec(mTextviewArray[i]).setIndicator(getTabItemView(i));
            //将Tab按钮添加进Tab选项卡中
            mTabHost.addTab(tabSpec, fragmentArray[i], null);
            //设置Tab按钮的背景
            mTabHost.getTabWidget().getChildAt(i).setBackgroundResource(R.drawable.selector_tab_background);
        }
    }
                
    /**
     * 给Tab按钮设置图标和文字
     */
    private View getTabItemView(int index){
        View view = layoutInflater.inflate(R.layout.tab_item_view, null);
    
        ImageView imageView = (ImageView) view.findViewById(R.id.imageview);
        imageView.setImageResource(mImageViewArray[index]);
        
        TextView textView = (TextView) view.findViewById(R.id.textview);        
        textView.setText(mTextviewArray[index]);
    
        return view;
    }
}</span>

<span style="font-size:12px;">package com.yangyu.mycustomtab02;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class FragmentPage1 extends Fragment{

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {        
        return inflater.inflate(R.layout.fragment_1, null);        
    }    
}
</span>