模仿新浪微博点击button切换fragment

关键代码：

package com.itfanr.fragmenttab;

import android.app.Activity;
import android.app.ActionBar;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.os.Build;

public class MainActivity extends Activity {

	private Fragment[] mFragments;  
    private RadioGroup bottomRg;  
    private FragmentManager fragmentManager;  
    private FragmentTransaction fragmentTransaction;  
    private RadioButton rbOne, rbTwo, rbThree; 
    
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		 mFragments = new Fragment[3];  
	        fragmentManager = this.getFragmentManager();  
	        mFragments[0] = fragmentManager.findFragmentById(R.id.chat_fragment);  
	        mFragments[1] = fragmentManager.findFragmentById(R.id.find_fragment);  
	        mFragments[2] = fragmentManager  
	                .findFragmentById(R.id.mine_fragment);  
	        fragmentTransaction = fragmentManager.beginTransaction()  
	                .hide(mFragments[0]).hide(mFragments[1]).hide(mFragments[2]);  
	        fragmentTransaction.show(mFragments[0]).commit(); 
	        setFragmentIndicator() ;
	}
	
	 private void setFragmentIndicator() {  
		  
	        this.bottomRg = (RadioGroup) findViewById(R.id.bottomRg);  
	        this.rbOne = (RadioButton) findViewById(R.id.rbOne);  
	        this.rbTwo = (RadioButton) findViewById(R.id.rbTwo);  
	        this.rbThree = (RadioButton) findViewById(R.id.rbThree);  
	  
	        bottomRg.setOnCheckedChangeListener(new OnCheckedChangeListener() {  
	  
	            @Override  
	            public void onCheckedChanged(RadioGroup group, int checkedId) {  
	                fragmentTransaction = fragmentManager.beginTransaction()  
	                        .hide(mFragments[0]).hide(mFragments[1])  
	                        .hide(mFragments[2]);  
	                switch (checkedId) {  
	                case R.id.rbOne:  
	                    fragmentTransaction.show(mFragments[0]).commit();  
	                    break;  
	  
	                case R.id.rbTwo:  
	                    fragmentTransaction.show(mFragments[1]).commit();  
	                    break;  
	  
	                case R.id.rbThree:  
	                    fragmentTransaction.show(mFragments[2]).commit();  
	                    break;  
	  
	                default:  
	                    break;  
	                }  
	            }  
	        });  
	    }  

}

主界面布局：

<LinearLayout 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"
    android:orientation="vertical"
    android:gravity="center" >

    <fragment
        android:id="@+id/chat_fragment"
        android:name="com.itfanr.fragmenttab.ChatFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="10" />

    <fragment
        android:id="@+id/find_fragment"
        android:name="com.itfanr.fragmenttab.FindFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="10" />

    <fragment
        android:id="@+id/mine_fragment"
        android:name="com.itfanr.fragmenttab.MineFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="10" />

    <RadioGroup
        android:id="@+id/bottomRg"
        android:layout_width="fill_parent"
        android:layout_height="20dp"
        android:layout_weight="0.5"
        android:orientation="horizontal" 
        android:gravity="center">

        <RadioButton
            android:id="@+id/rbOne"
            android:background="@drawable/ofm_collect_icon"
            android:checked="true"
            android:text="聊天" />

        <RadioButton
            android:id="@+id/rbTwo"
            android:background="@drawable/ofm_collect_icon"
            android:text="发现" />

        <RadioButton
            android:id="@+id/rbThree"
            android:background="@drawable/ofm_collect_icon"
            android:text="我的" />
    </RadioGroup>

</LinearLayout>