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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