RadioButton dynamically added, select settings

public class MainActivity extends AppCompatActivity {
    private RadioGroup radioGroup;

    @Override
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);    
        setContentView(R.layout.activity_main);
        radioGroup = findViewById(R.id.group);
        initData ();
    }

    private void initData() {
        String[] names = { "all" , "apple" , "pear" , "banana" , "kiwi" , "loquat" , "nectarine" , "lychee" , "cantaloupe" , "grape" , "sour jujube" , "Jujube" , "Walnut" , "Pineapple" , "Orange" , "Orange" };
         for ( int i = 0 ; i < names. length ; i++) {
            RadioButton radioButton = (RadioButton) LayoutInflater.from(this).inflate(R.layout.item_radiobutton, null, false);
            radioButton.setId(i);
            radioButton.setText(names[i]);
            radioGroup.addView(radioButton);
            if (0 == i) {
                radioGroup.check(0);
            }
        }
        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
public void onCheckedChanged(RadioGroup radioGroup, int i) {            
                RadioButton rb = radioGroup.findViewById(i);
                Toast.makeText(MainActivity.this, rb.getId() + "", Toast.LENGTH_SHORT).show();
            }
        });
    }


//    @Override
//    public void onWindowFocusChanged(boolean hasFocus) {
//        super.onWindowFocusChanged(hasFocus);
//        if (hasFocus && Build.VERSION.SDK_INT >= 19) {
//            View decorView = getWindow().getDecorView();
//            decorView.setSystemUiVisibility(
//                    View.SYSTEM_UI_FLAG_LAYOUT_STABLE
//                            | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
//                            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
//                            | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
//                            | View.SYSTEM_UI_FLAG_FULLSCREEN
//                            | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
//        }
//    }

}

layout:

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.demo1.MainActivity">

    <HorizontalScrollView
        android:layout_width="match_parent"
        android:scrollbars="none"
        android:layout_height="wrap_content">

        <RadioGroup
            android:id="@+id/group"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#22aa33"
            android:orientation="horizontal" />
    </HorizontalScrollView>



</LinearLayout>

item_radiobutton布局:

<?xml version="1.0" encoding="utf-8"?>
<RadioButton xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_weight="1"
    android:background="@drawable/rb_bg_selector"
    android:button="@null"
    android:gravity="center"
    android:padding="8dp"
    android:text="测试"
    android:textColor="@color/radiobutton_text_color_selector" />

rb_bg_selector选中背景色：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_checked="true">
        <layer-list>
            <!--底层使用蓝色填充色-->
            <!--stroke设置边框线，bottom,top取框线负值，背景图填充满-->
            <item android:bottom="-8dp" android:top="-8dp">
                <shape>
                    <solid android:color="#FF4081" />
                    <stroke android:width="8dp" android:color="#FFFFFF" />
                </shape>
            </item>
            <!-- 上面一层距离底层的顶部1dp,距离底部1dp,类似marginTop,填充色为白色，这样就形成了一个带有蓝色顶部边线和底部边线的白色背景的图-->
            <item android:bottom="1dp">
                <shape>
                    <solid android:color="#FFFFFF" />
                    <padding android:left="8dp" android:right="8dp" />
                </shape>
            </item>
        </layer-list>
    </item>
    <item>
        <shape>
            <solid android:color="#FFFFFF" />
        </shape>
    </item>
</selector>

Text selection background color:

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