一个activity是用来做题用的，效果如下图

在点击下一题时，RadioGroup会默认为第一次选中的状态，造成RadioButton选择混。

解决方案： 第一步：取消监听 radioGroup_problem_group.setOnCheckedChangeListener(null);  radioGroup_problem_group为RadioGroup变量名。

第二部：清除选中记录 radioGroup_problem_group.clearCheck();

主要代码：

1. 布局文件：

<?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">

    <!--单选题-->

    <LinearLayout

        android:id="@+id/linearLayout_problem"

        android:orientation="vertical"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginTop="20dp"

        android:layout_marginLeft="20dp"

        android:layout_marginRight="20dp"

        android:visibility="visible"

        >

        <!--题目标题-->

        <LinearLayout

            android:id="@+id/linearLayout_problem_problem"

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:layout_alignParentTop="true"

            >

            <!--选择题目题号-->

            <TextView

                android:id="@+id/textView_problem_number"

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                />

            <!--选择题目标题-->

            <TextView

                android:id="@+id/textView_problem_title"

                android:layout_width="match_parent"

                android:layout_height="wrap_content"

                android:layout_marginLeft="10dp"

                />

        </LinearLayout>

        <!--题目选项-->

        <LinearLayout

            android:id="@+id/linearLayout_problem_checkBox"

            android:orientation="vertical"

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:layout_marginTop="20dp"

            android:layout_marginLeft="5dp"

            >

            <!--选项单选-->

            <RadioGroup

                android:id="@+id/radioGroup_problem_group"

                android:layout_width="match_parent"

                android:layout_height="wrap_content"

                >

                <!--题目选项1  android:background="@drawable/linear_layout_middle_content" -->

                <RadioButton

                    android:id="@+id/radioButton_problem_option1"

                    android:layout_width="match_parent"

                    android:layout_height="wrap_content"

                    />

                <!--题目选项2-->

                <RadioButton

                    android:id="@+id/radioButton_problem_option2"

                    android:layout_width="match_parent"

                    android:layout_height="wrap_content"

                    android:layout_marginTop="20dp"

                    />

                <!--题目选项3-->

                <RadioButton

                    android:id="@+id/radioButton_problem_option3"

                    android:layout_width="match_parent"

                    android:layout_height="wrap_content"

                    android:layout_marginTop="20dp"

                    />

                <!--题目选项4-->

                <RadioButton

                    android:id="@+id/radioButton_problem_option4"

                    android:layout_width="match_parent"

                    android:layout_height="wrap_content"

                    android:layout_marginTop="20dp"

                    />

            </RadioGroup>

        </LinearLayout>

    </LinearLayout>

    <!--显示已答和总题数信息-->

    <LinearLayout

        android:id="@+id/linearLayout_problem_information"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginTop="20dp"

        android:layout_marginLeft="20dp"

        android:layout_marginRight="20dp"

        android:visibility="visible"

        >

        <LinearLayout

            android:orientation="horizontal"

            android:layout_width="wrap_content"

            android:layout_height="match_parent">

            <TextView

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:text="已答/总数 :  "

                />

            <TextView

                android:id="@+id/textView_problem_answered_total"

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                />

            <TextView

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:text=" / "

                />

            <TextView

                android:id="@+id/textView_problem_all_total"

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                />

        </LinearLayout>

    </LinearLayout>

    <!--下一题按钮-->

    <Button

        android:id="@+id/button_problem_next"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginTop="40dp"

        android:layout_marginLeft="20dp"

        android:layout_marginRight="20dp"

        android:background="@drawable/linear_layout_middle_content"

        android:visibility="gone"

        android:text="下一题"

        />

    <!--完成按钮-->

    <Button

        android:id="@+id/button_problem_complete"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginTop="40dp"

        android:layout_marginLeft="20dp"

        android:layout_marginRight="20dp"

        android:background="@drawable/linear_layout_middle_content"

        android:visibility="gone"

        android:text="完成"

        />

</LinearLayout>

2. activity代码

package com.example.lenovo.computerbase;

import android.content.Intent;

import android.graphics.Color;

import android.os.Handler;

import android.os.Message;

import android.support.annotation.IdRes;

import android.support.v7.app.ActionBar;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.LinearLayout;

import android.widget.RadioButton;

import android.widget.RadioGroup;

import android.widget.TextView;

import com.example.lenovo.computerbase.bean.HttpAddress;

import com.example.lenovo.computerbase.bean.Problem;

import com.example.lenovo.computerbase.bean.ShowToast;

import com.example.lenovo.computerbase.controller.ActivityCollectorController;

import com.example.lenovo.computerbase.http.HttpConnection;

import com.google.gson.Gson;

import com.google.gson.reflect.TypeToken;

import java.io.IOException;

import java.lang.ref.WeakReference;

import java.util.ArrayList;

import okhttp3.Call;

import okhttp3.Response;

/*

*  测试练习

* */

public class TestActivity extends AppCompatActivity implements View.OnClickListener{

    //返回和退出布局LinearLayout

    private LinearLayout linearLayout_title_back,linearLayout_title_close;

    //返回和退出布局ImageView

    private ImageView imageView_title_back, imageView_title_close;

    //顶部中间显示文字区域

    private TextView textView_title_text;

    private TextView textView_problem_number, textView_problem_title;

    private RadioGroup radioGroup_problem_group;

    private RadioButton radioButton_problem_option1, radioButton_problem_option2,

            radioButton_problem_option3, radioButton_problem_option4;

    private TextView textView_problem_answered_total, textView_problem_all_total;

    private Button button_problem_next, button_problem_complete;

    private ProblemHandler problemHandler = new ProblemHandler(this);

    HttpAddress httpAddress = new HttpAddress();

    private String loginId;

    private int index = 0;

    ArrayList<Problem> problems = new ArrayList<>();

    private int length;

    private int textColor;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_test);

        httpAddress = (HttpAddress) getApplication();

        loginId = getIntent().getStringExtra("loginId");

        initView();

        requestProblem();

    }

    public void initView(){

        //将该Activity加入活动集合控制器

        ActivityCollectorController.addActivity(this);

        //将导航栏隐藏

        ActionBar actionBar = getSupportActionBar();

        if (actionBar != null){

            actionBar.hide();

        }

        //返回

        linearLayout_title_back = (LinearLayout)findViewById(R.id.linearLayout_title_back);

        linearLayout_title_back.setOnClickListener(this);

        //退出

        linearLayout_title_close = (LinearLayout)findViewById(R.id.linearLayout_title_close);

        linearLayout_title_close.setOnClickListener(this);

        //返回和退出布局ImageView

        imageView_title_back = (ImageView)findViewById(R.id.imageView_title_back);

        imageView_title_back.setColorFilter(this.getResources().getColor(R.color.colorWhite));

        imageView_title_close = (ImageView)findViewById(R.id.imageView_title_close);

        imageView_title_close.setColorFilter(this.getResources().getColor(R.color.colorWhite));

        //顶部中间显示文字区域

        textView_title_text = (TextView)findViewById(R.id.textView_title_text);

        textView_title_text.setText("随机练习");

        textView_title_text.setTextColor(this.getResources().getColor(R.color.colorWhite));

        textView_problem_number = (TextView) findViewById(R.id.textView_problem_number);

        textView_problem_title = (TextView) findViewById(R.id.textView_problem_title);

        radioGroup_problem_group = (RadioGroup) findViewById(R.id.radioGroup_problem_group);

        radioButton_problem_option1 = (RadioButton) findViewById(R.id.radioButton_problem_option1);

        radioButton_problem_option2 = (RadioButton) findViewById(R.id.radioButton_problem_option2);

        radioButton_problem_option3 = (RadioButton) findViewById(R.id.radioButton_problem_option3);

        radioButton_problem_option4 = (RadioButton) findViewById(R.id.radioButton_problem_option4);

        /* 得到RadioButton文字显示的默认颜色（黑色）

        * */

        textColor = radioButton_problem_option1.getCurrentTextColor();

        textView_problem_answered_total = (TextView) findViewById(R.id.textView_problem_answered_total);

        textView_problem_all_total = (TextView) findViewById(R.id.textView_problem_all_total);

        button_problem_next = (Button) findViewById(R.id.button_problem_next);

        button_problem_next.setOnClickListener(this);

        button_problem_complete = (Button) findViewById(R.id.button_problem_complete);

        button_problem_complete.setOnClickListener(this);

    }

    private static class ProblemHandler extends Handler{

        private final WeakReference<TestActivity> weakReference;

        public ProblemHandler(TestActivity testActivity){

            weakReference = new WeakReference<>(testActivity);

        }

        @Override

        public void handleMessage(Message message){

            if (weakReference.get() == null)

                return;

            // something

            weakReference.get().problems = message.getData().getParcelableArrayList("problems");

            weakReference.get().length = weakReference.get().problems.size();

            weakReference.get().showProblems(weakReference.get().index);

        }

    }


　　//进行网络请求

    public void requestProblem(){

        httpAddress.setAddress("RandomTestServlet");

        HttpConnection.sendOkHttpRequest(httpAddress.getAddress(), new okhttp3.Callback(){

            @Override

            public void onFailure(Call call, IOException e) {

                Log.d("TestActivity", "请求服务器失败!");

            }

            @Override

            public void onResponse(Call call, Response response) throws IOException {

                String responseData = response.body().string();

                System.out.println(responseData);

                ArrayList<Problem> problems = new Gson().fromJson(responseData, new TypeToken<ArrayList<Problem>>(){}.getType());

                putProblemHandler(problems);

            }

        });

    }

    public void putProblemHandler(ArrayList<Problem> problems){

        Message message = Message.obtain();

        Bundle bundle = new Bundle();

        bundle.putParcelableArrayList("problems", problems);

        message.setData(bundle);

        problemHandler.sendMessage(message);

    }


　　//通过下标取出单个Problem

    public void showProblems(int index){

        if (index < length){

            showProblem(problems.get(index));

        }

    }


　　//在页面上显示题目信息

    public void showProblem(Problem problem){

        textView_problem_number.setText(String.valueOf(problem.getP_no()));

        textView_problem_title.setText(problem.getP_title());

        radioButton_problem_option1.setText("A. " + problem.getP_option1());

        radioButton_problem_option2.setText("B. " + problem.getP_option2());

        radioButton_problem_option3.setText("C. " + problem.getP_option3());

        radioButton_problem_option4.setText("D. " + problem.getP_option4());

        /* 将RadioButton字体颜色设置为默认，是为了消除上一次选中留下的记录

        * */

        radioButton_problem_option1.setTextColor(textColor);

        radioButton_problem_option2.setTextColor(textColor);

        radioButton_problem_option3.setTextColor(textColor);

        radioButton_problem_option4.setTextColor(textColor);


　　　　// 显示已答题数和全部题数

        showAnsweredTotal(index, length);

        RadioGroupProblemListener radioGroupProblemListener = new RadioGroupProblemListener(problem);

　　　　//为RadioGroup设置监听

        radioGroup_problem_group.setOnCheckedChangeListener(radioGroupProblemListener);

    }

    // 内部类（设置监听）

    class RadioGroupProblemListener implements RadioGroup.OnCheckedChangeListener{

        private Problem problem;

        RadioGroupProblemListener(Problem problem){

            this.problem = problem;

        }

        @Override

        public void onCheckedChanged(RadioGroup radioGroup, int id) {

            //选择选项1

            if (id == radioButton_problem_option1.getId()) {

                /*

                 答案和选项1相等时，选项1显示GREEN颜色

                    否则，选项1显示RED颜色

                        并分别判断答案和其余每个选项是否相等，相等显示GREEN颜色

                  */

                if (problem.getP_answer().equals(problem.getP_option1())){

                    radioButton_problem_option1.setTextColor(Color.GREEN);

                }else {

                    radioButton_problem_option1.setTextColor(Color.RED);

                    if (problem.getP_answer().equals(problem.getP_option2())){

                        radioButton_problem_option2.setTextColor(Color.GREEN);

                    }else if (problem.getP_answer().equals(problem.getP_option3())){

                        radioButton_problem_option3.setTextColor(Color.GREEN);

                    }else if (problem.getP_answer().equals(problem.getP_option4())){

                        radioButton_problem_option4.setTextColor(Color.GREEN);

                    }

                }

                lastProblem();

            }

            //选择选项2

            else if (id == radioButton_problem_option2.getId()) {

                if (problem.getP_answer().equals(problem.getP_option2())){

                    radioButton_problem_option2.setTextColor(Color.GREEN);

                }else {

                    radioButton_problem_option2.setTextColor(Color.RED);

                    if (problem.getP_answer().equals(problem.getP_option1())){

                        radioButton_problem_option1.setTextColor(Color.GREEN);

                    }else if (problem.getP_answer().equals(problem.getP_option3())){

                        radioButton_problem_option3.setTextColor(Color.GREEN);

                    }else if (problem.getP_answer().equals(problem.getP_option4())){

                        radioButton_problem_option4.setTextColor(Color.GREEN);

                    }

                }

                lastProblem();

            }

            //选择选项3

            else if (id == radioButton_problem_option3.getId()) {

                if (problem.getP_answer().equals(problem.getP_option3())){

                    radioButton_problem_option3.setTextColor(Color.GREEN);

                }else {

                    radioButton_problem_option3.setTextColor(Color.RED);

                    if (problem.getP_answer().equals(problem.getP_option1())){

                        radioButton_problem_option1.setTextColor(Color.GREEN);

                    }else if (problem.getP_answer().equals(problem.getP_option2())){

                        radioButton_problem_option2.setTextColor(Color.GREEN);

                    }else if (problem.getP_answer().equals(problem.getP_option4())){

                        radioButton_problem_option4.setTextColor(Color.GREEN);

                    }

                }

                lastProblem();

            }

            //选择选项4

            else if (id == radioButton_problem_option4.getId()) {

                if (problem.getP_answer().equals(problem.getP_option4())){

                    radioButton_problem_option4.setTextColor(Color.GREEN);

                }else {

                    radioButton_problem_option4.setTextColor(Color.RED);

                    if (problem.getP_answer().equals(problem.getP_option1())){

                        radioButton_problem_option1.setTextColor(Color.GREEN);

                    }else if (problem.getP_answer().equals(problem.getP_option2())){

                        radioButton_problem_option2.setTextColor(Color.GREEN);

                    }else if (problem.getP_answer().equals(problem.getP_option3())){

                        radioButton_problem_option3.setTextColor(Color.GREEN);

                    }

                }

                lastProblem();

            }

        }

    }


　　　//判断是否最后一题，最后一题时显示完成按钮，否则显示下一题按钮

    public void lastProblem(){

        System.out.println("index = " + index);

        System.out.println("length = " + length);

        showAnsweredTotal(index + 1, length);

        // 最后一题

        if (index == length - 1){

            System.out.println("index == length - 1 ");

            button_problem_complete.setVisibility(View.VISIBLE);

        }else {

            System.out.println("index != length - 1 ");

            button_problem_next.setVisibility(View.VISIBLE);

        }

    }

    public void showAnsweredTotal(int i, int j){

        // 已答题数

        textView_problem_answered_total.setText(String.valueOf(i));

        textView_problem_answered_total.setTextColor(Color.GREEN);

        // 全部题数

        textView_problem_all_total.setText(String.valueOf(j));

    }

    /* 设置恢复RadioGroup默认状态

    * */

    public void defaultRadioGroup(){

        /*

        *  循环使用RadioGroup时需要先取消监听，再清除选中记录

        * */

        // 1. 取消监听

        radioGroup_problem_group.setOnCheckedChangeListener(null);

        // 2. 清除选中记录

        radioGroup_problem_group.clearCheck();

    }

    @Override

    public void onClick(View view) {

        switch (view.getId()){

            //返回

            case R.id.linearLayout_title_back:

                finish();

                break;

            //退出

            case R.id.linearLayout_title_close:

                ActivityCollectorController.finishAll();

                Intent closeIntent = new Intent(getBaseContext(),LoginActivity.class);

                startActivity(closeIntent);

                new ShowToast(this,"您已退出!").showToast();

                break;

            case R.id.button_problem_next:

　　　　　　　　　　//题目索引加一

                index ++;

                button_problem_next.setVisibility(View.GONE);

                // 清除上次选中记录

                defaultRadioGroup();

                showProblems(index);

                // 2. 重新请求problem

                break;

            case R.id.button_problem_complete:

                button_problem_complete.setVisibility(View.GONE);

                finish();

                break;

                default:

        }

    }

}

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