【Android从零单排系列十】《Android视图控件——RadioButton》

<?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"
    tools:context=".MainActivity"
    android:orientation="vertical">
    <TextView
        android:id="@+id/button"
        android:text="【Android从零单排系列十】《Android视图控件——RadioButton》"
        android:background="@drawable/btn_selector"
        android:layout_width="match_parent"
        android:layout_marginTop="30dp"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_height="wrap_content"/>
    <RadioGroup
        android:id="@+id/radioGroup"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:gravity="center"
        android:orientation="horizontal">
        <RadioButton
            android:id="@+id/radioButton1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:button="@null"
            android:checked="true"
            android:drawablePadding="10dp"
            android:layout_marginRight="30dp"
            android:drawableLeft="@drawable/radio_btn_selector"
            android:gravity="center"
            android:text="红色"
            android:textColor="#FF0033"/>
        <RadioButton
            android:id="@+id/radioButton2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:button="@null"
            android:drawablePadding="10dp"
            android:drawableLeft="@drawable/radio_btn_selector"
            android:gravity="center"
            android:text="蓝色"
            android:textColor="#000000"/>
    </RadioGroup>
</LinearLayout>

RadioButtonActivity 

package com.example.myapplication;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;

public class RadioButtonActivity extends Activity {
    private RadioGroup radioGroup;
    private RadioButton radioButton1;
    private RadioButton radioButton2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_radio_button);
        radioGroup = findViewById(R.id.radioGroup);
        radioButton1 = findViewById(R.id.radioButton1);
        radioButton2 = findViewById(R.id.radioButton2);

        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                if(radioButton1.isChecked()) {
                    radioButton1.setTextColor(Color.RED);
                }else{
                    radioButton1.setTextColor(Color.parseColor("#000000"));
                }

                if(radioButton2.isChecked()) {
                    radioButton2.setTextColor(Color.RED);
                }else{
                    radioButton2.setTextColor(Color.parseColor("#000000"));
                }
            }
        });
    }
}

<?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/on"/>
    <item android:drawable="@mipmap/off"/>
</selector>