android的RadioGroup講解

這個主要是如何替換fragment的demo。效果圖如下(下面的tabhost和上面的bar不屬于這次的內容,這個是我做的一個應用程序框架的一部分,有需要的或者想研究研究的可以私下聯系),主要是講解中間的內容怎么實現,即點擊上面的RadioGroup,下面的內容一起改變(改變的是XML中的布局,這樣的話下面三個的布局完全可以自己定義)

1.首先在主界面的xml中添加一個RadioGroup,里面添加三個RadioButton即可

<RadioGroup  android:  style="@style/layout_full"  android:layout_margin="5dp"  android:background="@drawable/rounded_edittext"  android:orientation="horizontal"  android:padding="5dp" >   <RadioButton  android:  style="@style/layout_horizontal"  android:layout_gravity="center_horizontal"  android:layout_weight="1"  android:checked="true"  android:text="均分" />   <RadioButton  android:  style="@style/layout_horizontal"  android:layout_gravity="center_horizontal"  android:layout_weight="1"  android:text="個人" />   <RadioButton  android:  style="@style/layout_horizontal"  android:layout_gravity="center"  android:layout_weight="1"  android:text="借貸" />  </RadioGroup> 

其中

android:background="@drawable/rounded_edittext" 

這一句是給這個RadioGroup添加一個帶圓角的邊框?

rounded_edittext.xml的代碼如下

<?xml version="1.0" encoding="utf-8"?> <shape xmlns:andro  android:shape="rectangle" >   <solid android:color="#ffffff" />   <corners android:radius="7dip" />   <stroke  android:width="2px"  android:color="#000000" />  </shape> 

放置在drawable文件夾下即可

2.下面的內容由三個xml定義好的布局來呈現,這三個xml的布局可以自己來寫 ,我就很簡單地建了三個,做例子用

speeddial_fragment_pay1.xml

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:andro  android:layout_width="fill_parent"  android:layout_height="fill_parent"  android:layout_margin="5dp"  android:background="@drawable/rounded_edittext"  android:orientation="vertical" >   <Button  android:  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:layout_centerHorizontal="true"  android:layout_centerVertical="true"  android:text="Button" />  </RelativeLayout> 

3.(重要)在主布局文件中添加Fragment的載體,比如一個framlayout,負責承載fragment

在上面的RadioGroup的布局下增加:

<FrameLayout  android:  android:layout_width="match_parent"  android:layout_height="match_parent" /> 

這樣布局就完成了

4.由于Fragment的特性,我們要新建三個自己的Fragment,都繼承自Fragment?

SpeeddialFragmentOne.java

package?com.gracker.fragment;?? import?android.app.Fragment;??import?android.os.Bundle;??import?android.view.LayoutInflater;??import?android.view.View;??import?android.view.ViewGroup;?? import?com.gracker.tabactivity.R;?? public class?SpeeddialFragmentOne?extends?Fragment?{??   @Override  public void?onCreate(Bundle?savedInstanceState)?{?? //?TODO?Auto-generated?method?stub  super.onCreate(savedInstanceState);??????}??   @Override  public?View?onCreateView(LayoutInflater?inflater,?ViewGroup?container,??????????????Bundle?savedInstanceState)?{?? //?TODO?Auto-generated?method?stub  return?inflater.inflate(R.layout.speeddial_fragment_pay1,?container,?false);??????}??}??

這個Fragment非常簡單,沒有添加任何的邏輯,僅僅只是在onCreateView的要布局然后以View返回。Fragment有很多方法,可以根據自己的需要進行重載,這里就不多說了,自己到用的時候自然就知道了。

類似地,建立另外兩個Fragment ,改變的僅僅是

return?inflater.inflate(R.layout.speeddial_fragment_pay1,?container,?false);??

5.在主Activity中調用:

MainActivity.java

/** ?*?主Activity ?*? ?*?@author?Gracker?Gao ?*?@date?2012.8.15 ?*/ package?com.gracker.hostactivity;?? import?android.app.Activity;??import?android.app.FragmentTransaction;??import?android.os.Bundle;??import?android.util.Log;??import?android.widget.RadioGroup;??import?android.widget.RadioGroup.OnCheckedChangeListener;?? import?com.gracker.fragment.SpeeddialFragmentOne;??import?com.gracker.fragment.SpeeddialFragmentThree;??import?com.gracker.fragment.SpeeddialFragmentTwo;??import?com.gracker.tabactivity.R;?? public class?MainActivity?extends?Activity?{??  private final?String?TAG?=?"SpeedDialActivity";??  private?RadioGroup?mRadioGroup;?? private?SpeeddialFragmentTwo?mSpeeddialFragmentTwo;?? private?SpeeddialFragmentOne?mSpeeddialFragmentOne;?? private?SpeeddialFragmentThree?mSpeeddialFragmentThree;??  private?FragmentTransaction?transaction;??  public void?onCreate(Bundle?savedInstanceState)?{?? super.onCreate(savedInstanceState);??????????setContentView(R.layout.speeddial);?? ????????init_date();??????????setupWidgets();??????}??  private void?init_date(){??????????transaction?=?getFragmentManager()??????????????????.beginTransaction();?? if?(null?==?mSpeeddialFragmentOne)?{??????????????mSpeeddialFragmentOne?=?new?SpeeddialFragmentOne();??????????}??????????transaction.add(R.id.fragment_container,??????????????????mSpeeddialFragmentOne);?? //?Commit?the?transaction ????????transaction.commit();??????}??  private void?setupWidgets()?{?? ????????mRadioGroup?=?(RadioGroup)?findViewById(R.id.radioGroup1);??????????mRadioGroup.setOnCheckedChangeListener(new?OnCheckedChangeListener()?{??  @Override  public void?onCheckedChanged(RadioGroup?group,?int?checkedId)?{?? //?TODO?Auto-generated?method?stub   switch?(checkedId)?{?? case?R.id.radio0:??????????????????????Log.v(TAG,?"setupWidgets():radio0?clicked");?? if?(null?==?mSpeeddialFragmentOne)?{??????????????????????????mSpeeddialFragmentOne?=?new?SpeeddialFragmentOne();??????????????????????}??????????????????????transaction?=?getFragmentManager()??????????????????????????????.beginTransaction();??????????????????????transaction.replace(R.id.fragment_container,??????????????????????????????mSpeeddialFragmentOne);??????????????? //?Commit?the?transaction ????????????????????transaction.commit();?? break;?? case?R.id.radio1:??????????????????????Log.v(TAG,?"setupWidgets():radio1?clicked");?? if?(null?==?mSpeeddialFragmentTwo)?{??????????????????????????mSpeeddialFragmentTwo?=?new?SpeeddialFragmentTwo();??????????????????????}??????????????????????transaction?=?getFragmentManager()??????????????????????????????.beginTransaction();??????????????????????transaction.replace(R.id.fragment_container,??????????????????????????????mSpeeddialFragmentTwo);??????????????????? //?Commit?the?transaction ????????????????????transaction.commit();?? break;?? case?R.id.radio2:??????????????????????Log.v(TAG,?"setupWidgets():radio2?clicked");??  if?(null?==?mSpeeddialFragmentThree)?{??????????????????????????mSpeeddialFragmentThree?=?new?SpeeddialFragmentThree();??????????????????????}??????????????????????transaction?=?getFragmentManager()??????????????????????????????.beginTransaction();??????????????????????transaction.replace(R.id.fragment_container,??????????????????????????????mSpeeddialFragmentThree);????????????????????? //?Commit?the?transaction ????????????????????transaction.commit();?? break;??  default:?? break;??????????????????}??????????????}??????????});??????}??  @Override  protected void?onResume()?{?? //?TODO?Auto-generated?method?stub  super.onResume();?? ????}??  @Override  protected void?onDestroy()?{?? //?TODO?Auto-generated?method?stub  super.onDestroy();?? //?dataEncapsulation.closeDataBase_speedDial(); ????}?? }??

init_data()函數中主要是初始化值,包括初始化用戶第一個看到的Fragment

在RadioGroup的onCheckedChangeLinsteer中,切換Fragment。關于Fragment的一些操作,比如增加,刪除,替換等等,可以參照這個帖子:http://www.eoeandroid.com/thread-71642-1-1.html?講的很詳細,我也不想重復。

這個Demo就不提供下載了,畢竟不是很難,所有的東西都交代了,自己敲一遍收獲總是比打開別人的代碼來研究要好的多。

例子中有什么錯誤的地方歡迎指正。