Android使用RadioGroup实现底部导航栏

radiogroup实现底部导航栏效果，如图:：

 

实现可最基本的导航栏功能，不能左右滑动，只能点击

1.内嵌的fragment的布局：

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical" android:layout_width="match_parent"
 android:layout_height="match_parent">
 <textview
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:gravity="center"
  android:textsize="50sp"
  android:textcolor="@color/colorprimary"
  android:text="home"/>
</linearlayout>

2.fragment的activity代码：

public class frhome extends fragment {

 @nullable
 @override
 public view oncreateview(layoutinflater inflater, @nullable viewgroup container, @nullable bundle savedinstancestate) {
  view view = layoutinflater.from(getcontext()).inflate(r.layout.fragment_home, container, false);
  return view;
 }

}

以此为例根据需要编写不同的fragment布局等等。

3.装载fragment的界面布局如下（其中使用了selector进行实现点击改变图标和文字颜色）：

点击改变文字颜色：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
 <item android:state_checked="true" android:color="#3f51b5"/>
 <item android:state_checked="false" android:color="#8f8f8f"/>
</selector>

点击改变图标：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
 <item android:state_checked="true" android:drawable="@mipmap/ic_history_checked"/>
 <item android:state_checked="false" android:drawable="@mipmap/ic_history_unchecked"/>
</selector>

界面布局：

<?xml version="1.0" encoding="utf-8"?>
<relativelayout 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"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 tools:context="com.lotus.chartspagedemo.acthome">

 <framelayout
  android:id="@+id/frame_layout"
  android:layout_width="match_parent"
  android:layout_above="@+id/card_view"
  android:layout_height="match_parent"/>

 <android.support.v7.widget.cardview
  android:id="@+id/card_view"
  app:cardelevation="25dp"
  android:layout_alignparentbottom="true"
  android:layout_width="match_parent"
  android:layout_height="wrap_content">
  <radiogroup
   android:paddingtop="5dp"
   android:id="@+id/tab_bar"
   android:background="@color/app_white"
   android:layout_width="match_parent"
   android:layout_height="60dp"
   android:gravity="center"
   android:orientation="horizontal">
   <radiobutton
    android:id="@+id/tab_home"
    android:gravity="center"
    android:button="@null"
    android:drawabletop="@drawable/selector_tab_home"
    android:layout_width="0dp"
    android:layout_weight="1"
    android:layout_height="match_parent"
    android:textcolor="@drawable/selector_tab_color"
    android:text="首页"/>
   <radiobutton
    android:id="@+id/tab_health"
    android:gravity="center"
    android:button="@null"
    android:drawabletop="@drawable/selector_tab_health"
    android:layout_width="0dp"
    android:layout_weight="1"
    android:layout_height="match_parent"
    android:textcolor="@drawable/selector_tab_color"
    android:text="体检测评" />
   <radiobutton
    android:id="@+id/tab_personal"
    android:gravity="center"
    android:button="@null"
    android:drawabletop="@drawable/selector_tab_personal"
    android:layout_width="0dp"
    android:layout_weight="1"
    android:layout_height="match_parent"
    android:textcolor="@drawable/selector_tab_color"
    android:text="个人中心"
    />
  </radiogroup>
 </android.support.v7.widget.cardview>

</relativelayout>

4.装载fragment的界面的activity代码（加入双击返回键则退出应用）：

public class acthome extends fragmentactivity implements radiogroup.oncheckedchangelistener {

 @bindview(r.id.frame_layout)
 framelayout framelayout;
 @bindview(r.id.tab_home)
 radiobutton tabhome;
 @bindview(r.id.tab_health)
 radiobutton tabhealth;
 @bindview(r.id.tab_personal)
 radiobutton tabpersonal;
 @bindview(r.id.tab_bar)
 radiogroup tabbar;

 public final static string action_exit_system = "sys_exit";

 private fragmentmanager manager;
 private fragmenttransaction transaction;
 private frhome frhome;
 private frhealth frhealth;
 private frpersonal frpersonal;
 private long mexittime;

 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_home);
  butterknife.bind(this);
  radiobutton tabhome = (radiobutton) tabbar.getchildat(0);
  tabhome.setchecked(true);
  tabbar.setoncheckedchangelistener(this);
  initfragment();
 }

 private void initfragment() {
  manager = getsupportfragmentmanager();
  transaction = manager.begintransaction();
  frhome = new frhome();
  transaction.add(r.id.frame_layout,frhome);
  transaction.commit();
 }

 @override
 public void oncheckedchanged(radiogroup radiogroup, @idres int checkedid) {
  switch (checkedid) {
   case r.id.tab_home:
    fragmenttransaction ft1 = manager.begintransaction();
    hideall(ft1);
    if (frhome!=null){
     ft1.show(frhome);
    }else {
     frhome=new frhome();
     ft1.add(r.id.frame_layout,frhome);
    }
    ft1.commit();
    break;
   case r.id.tab_health:
    fragmenttransaction ft2 = manager.begintransaction();
    hideall(ft2);
    if (frhealth!=null){
     ft2.show(frhealth);
    }else {
     frhealth = new frhealth();
     ft2.add(r.id.frame_layout,frhealth);
    }
    ft2.commit();
    break;
   case r.id.tab_personal:
    fragmenttransaction ft5 = manager.begintransaction();
    hideall(ft5);
    if (frpersonal!=null){
     ft5.show(frpersonal);
    }else {
     frpersonal = new frpersonal();
     ft5.add(r.id.frame_layout, frpersonal);
    }
    ft5.commit();
    break;
  }
 }

 private void hideall(fragmenttransaction ft){
  if (ft==null){
   return;
  }
  if (frhome!=null){
   ft.hide(frhome);
  }
  if (frhealth!=null){
   ft.hide(frhealth);
  }
  if (frpersonal!=null){
   ft.hide(frpersonal);
  }
 }

 @override
 public void onbackpressed() {
  if ((system.currenttimemillis() - mexittime) > 2000) {
   toast.maketext(acthome.this,"再按一次退出程序",toast.length_short).show();
   mexittime = system.currenttimemillis();
  } else {
   new handler().postdelayed(new runnable() {
    @override
    public void run() {
     onexit(acthome.this);
    }
   }, 500);
  }
 }

 public static void onexit(final context context) {
  try {
   intent intent = new intent();
   intent.setaction(context.getapplicationcontext().getpackagename() + action_exit_system);
   context.sendbroadcast(intent);
   // mobclickagent.onkillprocess(context);
   new handler().postdelayed(new runnable() {
    @override
    public void run() {
     system.exit(0);
    }
   }, 200);
  } catch (exception e) {
   e.printstacktrace();
  }
 }
}

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