radioGroup+fragment

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//drawable图片改变<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:drawable="@mipmap/xing2" android:state_selected="true"/>    <item android:drawable="@mipmap/xing" android:state_selected="false"/></selector>//文字改变<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:color="#03A9F4" android:state_selected="true"/>    <item android:color="#BFBFC9" android:state_selected="false"/></selector>

//fragment
ArrayList<Fragment> list=new ArrayList<>();
//radioGroup+fragment
list.add(new Redio_Fragm1())
;list.add(new Redio_Fragm2())
;list.add(new Redio_Fragm3());
//设置默认选中推荐
rb_tuijian.setSelected(true);
rb_main_duanzi.setSelected(false);
rb_shipin.setSelected(false);
//得到Fragment的管理器
fragmentManager = getSupportFragmentManager();
//开启一个事务
final FragmentTransaction beginTransaction = fragmentManager.beginTransaction();
for (int i = 0; i < list.size(); i++) {    beginTransaction.add(R.id.fl,list.get(i));  
  if(i==0)    {        beginTransaction.show(list.get(i));    }  
  else    {        beginTransaction.hide(list.get(i));    } }
beginTransaction.commit();



//设置radioGroup点击改变状态
rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() 
{  
  @Override   
 public void onCheckedChanged(RadioGroup radioGroup, int i) 
{        //开启一个事务      
  final FragmentTransaction beginTransa = fragmentManager.beginTransaction(); 
       switch (i)        {     
       case R.id.rb_tuijian:         
       beginTransa.show(list.get(0));          
      //点击改变图片和文字             
    rb_tuijian.setSelected(true);            
    //别的不改变       
         rb_main_duanzi.setSelected(false);            
    rb_shipin.setSelected(false);             
   beginTransa.hide(list.get(1));         
       beginTransa.hide(list.get(2));          
      beginTransa.commit();              
  break;            
case R.id.rb_main_duanzi:      
          beginTransa.show(list.get(1));     
           rb_main_duanzi.setSelected(true);     
           rb_tuijian.setSelected(false);          
      rb_shipin.setSelected(false);             
   beginTransa.hide(list.get(0));               
 beginTransa.hide(list.get(2));              
  beginTransa.commit();             
   break;        
    case R.id.rb_shipin:        
        beginTransa.show(list.get(2)); 
               rb_shipin.setSelected(true);      
          rb_tuijian.setSelected(false);             
   rb_main_duanzi.setSelected(false);             
   beginTransa.hide(list.get(1));               
 beginTransa.hide(list.get(0));               
 beginTransa.commit();             
   break;   
     }    }});

//布局

  <FrameLayout   android:id="@+id/fl"   android:layout_width="match_parent"   android:layout_height="match_parent"   ></FrameLayout>


<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <RadioGroup        android:id="@+id/rg"        android:layout_width="match_parent"        android:layout_height="@dimen/y50"        android:gravity="center_vertical"        android:background="#ffffff"        android:orientation="horizontal"        >        <RadioButton            android:id="@+id/rb_tuijian"            android:button="@null"            android:drawableTop="@drawable/frag_rad_tu"            android:layout_weight="1"            android:layout_width="0dp"            android:text="推荐"            android:gravity="center"            android:textColor="@drawable/frag_rad_wen"            android:layout_height="@dimen/y40"            android:padding="@dimen/x5"            />        <RadioButton            android:padding="@dimen/x5"            android:id="@+id/rb_main_duanzi"            android:button="@null"            android:gravity="center"            android:layout_weight="1"            android:drawableTop="@drawable/frag_rad_tu2"            android:layout_width="0dp"            android:textColor="@drawable/frag_rad_wen"            android:text="段子"            android:layout_height="@dimen/y40"            />        <RadioButton            android:padding="@dimen/x5"            android:id="@+id/rb_shipin"            android:button="@null"            android:gravity="center"            android:drawableTop="@drawable/frag_rad_tu3"            android:textColor="@drawable/frag_rad_wen"            android:layout_weight="1"            android:layout_width="0dp"            android:text="视频"            android:layout_height="@dimen/y40"            />    </RadioGroup></LinearLayout>
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