FragmentLayout與Fragment簡單框架

package com.zzf.qq;

import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;

public class MainActivity
 
 extends Activity {

	private FragmentManager manager;
	private Frag_01 frag_01;
	private Frag_02 frag_02;
	private Frag_03 frag_03;
	private Frag_04 frag_04;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		// 獲取Fragment管理者
 

		manager = getFragmentManager();
		// 開啟事務
		FragmentTransaction transaction = manager.beginTransaction();
		// 把fragment物件新增到事務中	
		frag_01 = new Frag_01();
		frag_02 = new Frag_02();
		frag_03 = new Frag_03();
		frag_04 = new Frag_04();
		// (幀佈局id,fragment物件)
		transaction.add(R.id.main_frag, frag_01);
		transaction.
 
add(R.id.main_frag, frag_02);
		transaction.add(R.id.main_frag, frag_03);
		transaction.add(R.id.main_frag, frag_04);

		// 顯示和隱藏
		transaction.show(frag_01).hide(frag_02).hide(frag_03).hide(frag_04);
		// 提交
		transaction.commit();
		
		RadioGroup radioGroup = (RadioGroup) findViewById(R.id.radioGroup1);
		//預設選擇第一個radiobutton
		radioGroup.getChildAt(0).getId();
		radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {

			@Override
			public void onCheckedChanged(RadioGroup group, int checkedId) {
				// TODO Auto-generated method stub
				//開啟一個新的事物
				FragmentTransaction qq = manager.beginTransaction();
				//根據下標顯示與隱藏
				switch (checkedId) {
				case R.id.radio0:
					qq.show(frag_01).hide(frag_02).hide(frag_03).hide(frag_04);
					break;
				case R.id.radio1:
					qq.show(frag_02).hide(frag_01).hide(frag_03).hide(frag_04);
					break;
				case R.id.radio2:
					qq.show(frag_03).hide(frag_02).hide(frag_01).hide(frag_04);
					break;
				case R.id.radio3:
					qq.show(frag_04).hide(frag_02).hide(frag_03).hide(frag_01);
					break;
				}
				//提交新的事物
				qq.commit();
			}
		});

	}
}

<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" >

    <FrameLayout
        android:id="@+id/main_frag"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" >
    </FrameLayout>

    <RadioGroup
        android:gravity="center"
        android:id="@+id/radioGroup1"
        android:layout_width="match_parent"
        android:layout_height="56dp"
        android:orientation="horizontal" >

        <RadioButton
            android:id="@+id/radio0"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:button="@null"
            android:drawableTop="@drawable/select_01"
            android:gravity="center"
            android:text="訊息" />

        <RadioButton
            android:id="@+id/radio1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:button="@null"
            android:drawableTop="@drawable/select_01"
            android:gravity="center"
            android:text="聯絡人" />

        <RadioButton
            android:id="@+id/radio2"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:button="@null"
            android:drawableTop="@drawable/select_01"
            android:gravity="center"
            android:text="看點" />

        <RadioButton
            android:id="@+id/radio3"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:button="@null"
            android:drawableTop="@drawable/select_01"
            android:gravity="center"
            android:text="動態" />
    </RadioGroup>

</LinearLayout>