Android使用RadioGroup实现底部导航栏

<?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 

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;
 }

}

<?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 

<?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 

<?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 

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();
}
}
}