RadioGroup RadioButton底部导航栏

参考: https://blog.csdn.net/lu202032/article/details/117632709

activity_home.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"android:id="@+id/container"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><FrameLayoutandroid:id="@+id/nav_host_fragment_activity_main"android:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="1" /><!-- https://blog.csdn.net/lu202032/article/details/117632709 --><RadioGroupandroid:id="@+id/ra_group"android:layout_width="match_parent"android:layout_height="70dp"android:gravity="center_vertical"android:orientation="horizontal"><RadioButtonandroid:id="@+id/home_rb_home"android:layout_width="0dp"android:layout_height="wrap_content"android:layout_gravity="center"android:layout_weight="1"android:button="@null"android:checked="true"android:drawableTop="@drawable/ic_home_frag_home"android:drawablePadding="3dp"android:gravity="center"android:text="首页"android:textColor="@drawable/home_tv_tc_sel" /><androidx.constraintlayout.widget.ConstraintLayoutandroid:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1"><RadioButtonandroid:id="@+id/home_rb_bill"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_gravity="center"android:button="@null"android:drawableTop="@drawable/ic_home_frag_bill"android:drawablePadding="3dp"android:gravity="center"android:text="账单"android:textColor="@drawable/home_tv_tc_sel"app:layout_constraintTop_toTopOf="parent" /><!-- 角标 --><TextViewandroid:id="@+id/home_rb_bill_badge"android:layout_width="5dp"android:layout_height="5dp"android:layout_alignParentTop="true"android:layout_alignParentRight="true"android:layout_marginEnd="-28dp"android:background="@drawable/home_rb_bill_badge"android:gravity="center"android:minWidth="5dp"android:minHeight="5dp"android:textColor="#FFFFFF"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent" /></androidx.constraintlayout.widget.ConstraintLayout><RadioButtonandroid:id="@+id/home_rb_my"android:layout_width="0dp"android:layout_height="wrap_content"android:layout_gravity="center"android:layout_weight="1"android:button="@null"android:drawableTop="@drawable/ic_home_frag_my"android:drawablePadding="3dp"android:gravity="center"android:text="我的"android:textColor="@drawable/home_tv_tc_sel" /></RadioGroup>
</LinearLayout>

ic_home_frag_home

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

home_tv_tc_sel

<!-- res/drawable/home_tab.xml -->
<selector xmlns:android="http://schemas.android.com/apk/res/android"><item android:state_checked="true" android:color="#FF0000" /> <!-- 选中状态的颜色 --><item android:color="#808080" /> <!-- 默认状态的颜色 -->
</selector>

HomeActivity.java

public class HomeActivity extends BaseActivity<ActivityHomeBinding> {private BroadcastReceiver receiver;private x1Fragment x1Fragment;private xxxFragment xxxFragment;private x2Fragment x2Fragment;private x1FragmentType currentFragment;public static void open(BaseActivity context) { Intent starter = new Intent(context, HomeActivity.class); context.startActivity(starter);context.finish();}@Overrideprotected ActivityHomeBinding getViewBinding() {return ActivityHomeBinding.inflate(getLayoutInflater());}@Overridepublic void initData() { }@Overridepublic void initView() {setFragment(x1FragmentType.home);}public void setFragment(x1FragmentType fragType) {//获取Fragment管理器FragmentManager mFragmentManager = getSupportFragmentManager();//开启事务FragmentTransaction mTransaction = mFragmentManager.beginTransaction();//隐藏所有FragmenthideFragments(mTransaction);switch (fragType) {case home:if (x1Fragment == null) {x1Fragment = new x1Fragment();mTransaction.add(R.id.nav_host_fragment_activity_main, x1Fragment, "x1Fragment");} else {mTransaction.show(x1Fragment);}break;case bill:if (xxxFragment == null) {xxxFragment = new xxxFragment();mTransaction.add(R.id.nav_host_fragment_activity_main, xxxFragment, "xxxFragment");} else {mTransaction.show(xxxFragment);}break;case my:if (x2Fragment == null) {x2Fragment = new x2Fragment();mTransaction.add(R.id.nav_host_fragment_activity_main, x2Fragment, "x2Fragment");} else {mTransaction.show(x2Fragment);}break;default:break;}//提交事务mTransaction.commitAllowingStateLoss();currentFragment = fragType;}//隐藏Fragmentprivate void hideFragments(FragmentTransaction transaction) {if (xxxFragment != null) transaction.hide(xxxFragment);if (x1Fragment != null) transaction.hide(x1Fragment);if (x2Fragment != null) transaction.hide(x2Fragment);}@Overridepublic void setListener() {mBinding.raGroup.setOnCheckedChangeListener((group, checkedId) -> {if (checkedId == R.id.home_rb_home) {setFragment(x1FragmentType.home);} else if (checkedId == R.id.home_rb_bill) {setFragment(x1FragmentType.bill);} else if (checkedId == R.id.home_rb_my) {setFragment(x1FragmentType.my);}});} 
}

home_rb_bill_badge.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- res/drawable/badge_background.xml -->
<shape xmlns:android="http://schemas.android.com/apk/res/android"android:shape="oval"><solid android:color="#FF0000"/> <!-- 红色背景 --><sizeandroid:width="20dp"android:height="20dp"/>
</shape>