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(); } }}