Fragment+FragmentTabHost實現底部菜單欄

一、實現效果圖

二、項目工程結構

三、詳細代碼編寫

1、主tab佈局界面，main_tab_layout：

<?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>

2、Tab按鈕選項佈局，tab_item_view.xml：

<?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="首頁"
        android:textSize="10sp"
        android:textColor="#ffffff">  
    </TextView>  
      
</LinearLayout>

3、fragment佈局界面，這裏只列出一個，fragment_1.xml：

<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>

4、Tab選項的自定義按鈕資源文件，列出其中一個按鈕，tab_home_btn：

<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>

5、Tab選項按鈕背景資源文件，selector_tab_background.xml：

<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>

6、主Activity類，MainTabActivity.java：

<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：自定義TabHost 
 */
public class MainTabActivity extends FragmentActivity{    
    //定義FragmentTabHost對象  
    private FragmentTabHost mTabHost;  
          
    //定義一個佈局  
    private LayoutInflater layoutInflater;  
              
    //定義數組來存放Fragment界面  
    private Class fragmentArray[] = {FragmentPage1.class,FragmentPage2.class,FragmentPage3.class,FragmentPage4.class,FragmentPage5.class};  
          
    //定義數組來存放按鈕圖片  
    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選項卡的文字  
    private String mTextviewArray[] = {"首頁", "消息", "好友", "廣場", "更多"};  
          
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main_tab_layout);  
              
        initView();  
    }  
           
    /** 
     * 初始化組件 
     */
    private void initView(){  
        //實例化佈局對象  
        layoutInflater = LayoutInflater.from(this);  
                      
        //實例化TabHost對象，得到TabHost  
        mTabHost = (FragmentTabHost)findViewById(android.R.id.tabhost);  
        mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);   
              
        //得到fragment的個數  
        int count = fragmentArray.length;     
                      
        for(int i = 0; i < count; i++){    
            //爲每一個Tab按鈕設置圖標、文字和內容  
            TabSpec tabSpec = mTabHost.newTabSpec(mTextviewArray[i]).setIndicator(getTabItemView(i));  
            //將Tab按鈕添加進Tab選項卡中  
            mTabHost.addTab(tabSpec, fragmentArray[i], null);  
            //設置Tab按鈕的背景  
            mTabHost.getTabWidget().getChildAt(i).setBackgroundResource(R.drawable.selector_tab_background);  
        }  
    }  
                      
    /** 
     * 給Tab按鈕設置圖標和文字 
     */
    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>

7、Fragment頁面，FragmentPage1.java：

<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>