【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

转载请注明出处：http://blog.csdn.net/yangyu20121224/article/details/9016223

在上一篇文章中，我们花了大量的篇幅来讲解Fragment这个新引进类的使用，目的就是为了让大家能够牢牢的掌握它的使用方法，以便读者在今后的开发中能够熟练的使用它。

一、实现效果图





二、项目工程结构







三、详细代码编写

1、主tab布局界面，main_tab_layout：

[html] view
plaincopy

<?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按钮选项布局，tab_item_view.xml：

[html] view
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<?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>

3、fragment布局界面，这里只列出一个，fragment_1.xml：

[html] view
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<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选项的自定义按钮资源文件，列出其中一个按钮，tab_home_btn：

[html] view
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<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选项按钮背景资源文件，selector_tab_background.xml：

[html] view
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<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类，MainTabActivity.java：

[java] view
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<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>

7、Fragment页面，FragmentPage1.java：

[java] view
plaincopy

<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>