android 问答题 android简单答题系统

文章目录

• 一、案例演示
• 二、页面布局

• 1、activity_question.xml
• 2、fragment_radio_button.xml
• 3、fragment_chex_box.xml

• 三、功能实现

• 构思

• 1、Question.java
• 2、RadioButtonFragment.java
• 3、ChexBoxFragment.java
• 4、QuestionActivity.java

• 四、部分样式

• 1、select_button_text.xml
• 2、shape_radiobutton.xml
• 3、shape_radiobutton2.xml
• 4、shape_success_answer.xml
• 5、shape_error_answer.xml

fragment的切换，实体类的整体分析，单选多选的实现，

一、案例演示

• 单选题，多选题随机分布，单选题当点击选项提交错误时，选择的错误选项变红，正确选项变蓝。多选题当点击选项提交错误时所有选择的选项变红，正确时正确答案变蓝，
• 倒计时仅仅用来提示时间，并无其他功能，没有完善
• 当答题结束时显示最终答题分数

二、页面布局

1、activity_question.xml

1、不需要动的布局

2、代码

<?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"
    android:background="@color/hui"
    tools:context=".QuestionActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/white">
        <ImageView
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:background="@drawable/left"></ImageView>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="每日答题"
            android:textColor="@color/black"
            android:textSize="25dp"
            android:layout_gravity="center"
            android:layout_marginLeft="110dp"></TextView>
    </LinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
        <RelativeLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">

            <TextView
                android:id="@+id/time"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerVertical="true"
                android:layout_marginLeft="10dp"
                android:text="剩余时间:1:47"
                android:textColor="@color/black"
                android:textSize="25dp"></TextView>

            <Button
                android:id="@+id/submit"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentRight="true"
                android:layout_marginRight="10dp"
                android:background="@color/red2"
                android:text="提交"></Button>
        </RelativeLayout>

    </LinearLayout>

    <FrameLayout
        android:id="@+id/fragment1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
       ></FrameLayout>


</LinearLayout>

2、fragment_radio_button.xml

1、单选按钮fragment布局

2、代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    tools:context=".RadioButtonFragment">

    <LinearLayout
        android:layout_margin="10dp"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/white">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="30dp"
            android:textColor="@color/black"
            android:text="单选题"></TextView>

        <TextView
            android:layout_marginTop="5dp"
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:background="@color/black"></TextView>

        <LinearLayout
            android:layout_marginTop="5dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">
            <TextView
                android:id="@+id/question_item"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="25dp"
                android:text="题干"></TextView>
            <TextView
                android:id="@+id/textview"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="25dp"></TextView>
        </LinearLayout>
        <RadioGroup
            android:id="@+id/radiogroup"
            android:layout_marginTop="10dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <RadioButton
                android:id="@+id/radio1"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@drawable/select_button_text"
                android:textSize="20dp"
                android:gravity="center"
                android:button="@null"
                android:text="选项1"></RadioButton>

            <RadioButton
                android:id="@+id/radio2"
                android:layout_marginTop="10dp"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@drawable/select_button_text"
                android:gravity="center"
                android:textSize="20dp"
                android:button="@null"
                android:text="选项2"></RadioButton>

            <RadioButton
                android:id="@+id/radio3"
                android:layout_marginTop="10dp"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@drawable/select_button_text"
                android:gravity="center"
                android:textSize="20dp"
                android:button="@null"
                android:text="选项3"></RadioButton>

            <RadioButton
                android:id="@+id/radio4"
                android:layout_marginTop="10dp"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@drawable/select_button_text"
                android:button="@null"
                android:gravity="center"
                android:textSize="20dp"
                android:text="选项4"></RadioButton>
        </RadioGroup>
    </LinearLayout>

</LinearLayout>

3、fragment_chex_box.xml

1、多选按钮fragment布局

2、代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    tools:context=".ChexBoxFragment">

    <LinearLayout
        android:layout_margin="10dp"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/white">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="30dp"
            android:textColor="@color/black"
            android:text="多选题"></TextView>

        <TextView
            android:layout_marginTop="5dp"
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:background="@color/black"></TextView>

        <LinearLayout
            android:layout_marginTop="5dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:background="@color/white">
            <TextView
                android:id="@+id/question_item2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="25dp"
                android:text="题干"></TextView>
            <TextView
                android:id="@+id/b1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="10dp"></TextView>
            <TextView
                android:id="@+id/b2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="10dp"></TextView>
            <TextView
                android:id="@+id/b3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="10dp"></TextView>
            <TextView
                android:id="@+id/b4"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="25dp"></TextView>
            <TextView
                android:id="@+id/b5"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="10dp"></TextView>

        </LinearLayout>
        <CheckBox
            android:id="@+id/boxs1"
            android:layout_marginTop="5dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:button="@null"
            android:background="@drawable/select_button_text"
            android:textSize="20dp"
            android:text="选项1"></CheckBox>
        <CheckBox
            android:id="@+id/boxs2"
            android:layout_marginTop="5dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:button="@null"
            android:background="@drawable/select_button_text"
            android:textSize="20dp"
            android:text="选项2"></CheckBox>
        <CheckBox
            android:id="@+id/boxs3"
            android:layout_marginTop="5dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:button="@null"
            android:background="@drawable/select_button_text"
            android:textSize="20dp"
            android:text="选项3"></CheckBox>
        <CheckBox
            android:id="@+id/boxs4"
            android:layout_marginTop="5dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:button="@null"
            android:background="@drawable/select_button_text"
            android:textSize="20dp"
            android:text="选项4"></CheckBox>
        <CheckBox
            android:id="@+id/boxs5"
            android:layout_marginTop="5dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:button="@null"
            android:background="@drawable/select_button_text"
            android:textSize="20dp"
            android:text="选项5"></CheckBox>

    </LinearLayout>
</LinearLayout>

三、功能实现

构思

Fragment:
1.自己判断答案对不对: getResult()
2.更换题目内容: nextQuestion()
3.获取题目: setQuestion (Question q)

1、Question.java

实体类

public class Question {
    private String questionStem;//题干
    private String[] options;//选项
    private String correctOptions;//正确选项的下标从0开始
    private int questionTypes;//1 为单选题， 2为多选题

    public Question(String questionStem, String[] options, String correctOptions, int questionTypes) {
        this.questionStem = questionStem;
        this.options = options;
        this.correctOptions = correctOptions;
        this.questionTypes = questionTypes;
    }
    public Question() {
    }

    public String getQuestionStem() {
        return questionStem;
    }

    public void setQuestionStem(String questionStem) {
        this.questionStem = questionStem;
    }

    public String[] getOptions() {
        return options;
    }

    public void setOptions(String[] options) {
        this.options = options;
    }

    public String getCorrectOptions() {
        return correctOptions;
    }

    public void setCorrectOptions(String correctOptions) {
        this.correctOptions = correctOptions;
    }

    public int getQuestionTypes() {
        return questionTypes;
    }

    public void setQuestionTypes(int questionTypes) {
        this.questionTypes = questionTypes;
    }
}

2、RadioButtonFragment.java

public class RadioButtonFragment extends Fragment {
    //成员变量
    private TextView question_stem;//题干文本框控件，就是选中的控件显示
    private RadioGroup radioGroup;
    private RadioButton [] rb =new RadioButton[4];
    private Question question;//题目对象就是标题，单选多选，正确下标
    private int result;//正确为1 错误为0 未答题为-1


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        Log.e("单选onCreateView","单选onCreateView执行了");
        View view=inflater.inflate(R.layout.fragment_radio_button, container, false);
        return view;
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        Log.e("单选onViewCreated","单选onViewCreated执行了");
        //初始化控件
        initView(view);
        //更新题目
        nextQuestion(question);
    }
    //获取题目
    public void setQuestion(Question question){
        this.question=question;
    }
    //初始化控件
    public void initView(final View view){
        Log.e("单选initView","单选initView执行了");
        //获取题干
        question_stem=view.findViewById(R.id.question_item);
        radioGroup=view.findViewById(R.id.radiogroup);
        //单选控件
        rb[0]=view.findViewById(R.id.radio1);
        rb[1]=view.findViewById(R.id.radio2);
        rb[2]=view.findViewById(R.id.radio3);
        rb[3]=view.findViewById(R.id.radio4);
    }
    //清空原来选项
    public void clear(){
        radioGroup.clearCheck();
    }
    //更新题目
    public void nextQuestion(Question question){
        Log.e("单选nextQuestion","单选nextQuestion执行了");
        clear();
        //设置题干
        question_stem.setText(question.getQuestionStem());
        //设置选项
        for (int i=0;i<rb.length;i++){
            //所有选项初始都未选中
            rb[i].setChecked(false);
            //设置选项内容
            rb[i].setText(question.getOptions()[i]);
            //设置背景颜色
            rb[i].setBackgroundResource(R.drawable.select_button_text);
            //设置字体颜色
            rb[i].setTextColor(getResources().getColor(R.color.black));
        }
    }
    //判断选择结果
    public int getResult(Question question){
        //正确的id下标
        int correctIndex=Integer.parseInt(question.getCorrectOptions());
        int correctId=rb[correctIndex].getId();
        //当前选中的id
        int radioId=radioGroup.getCheckedRadioButtonId();
        if(radioId==-1){
            Toast.makeText(getContext(), "请选择你的选项", Toast.LENGTH_SHORT).show();
            result=-1;
        }else {
            for(int i=0;i< rb.length;i++){
                rb[i].setBackgroundResource(R.drawable.shape_radiobutton2);
            }
            if (radioId==correctId){
                Toast.makeText(getContext(), "回答正确", Toast.LENGTH_SHORT).show();
                result=1;
            }else {
                //答案错误背景和字体变对应的颜色
                RadioButton radioButton=getView().findViewById(radioId);
                radioButton.setBackgroundResource(R.drawable.shape_error_answer);
                radioButton.setTextColor(getResources().getColor(R.color.error));
                result=0;
            }
            //无论正确还是错误，正确的答案都显示出来
            rb[correctIndex].setBackgroundResource(R.drawable.shape_success_answer);
            rb[correctIndex].setTextColor(getResources().getColor(R.color.success));
        }
        return result;
    }
}

3、ChexBoxFragment.java

public class ChexBoxFragment extends Fragment {
    //成员变量
    private TextView question_stem;//题干文本框控件，就是选中的控件显示
    private CheckBox[] cb =new CheckBox[5];
    private Question question;//题目对象就是标题，单选多选，正确下标
    private int result;//正确为1 错误为0 未答题为-1
    private View view;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        Log.e("复选onCreateView","复选onCreateView执行了");
        view=inflater.inflate(R.layout.fragment_chex_box, container, false);
        return view;
    }
    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        Log.e("复选onViewCreated","复选onViewCreated执行了");
        //初始化控件
        initView(view);
        //更新题目
        nextQuestion(question);
    }
    //获取题目
    public void setQuestion(Question question){
        this.question=question;
    }

    public void clearChoice(){
        //清除选择
        for (int i = 0; i < cb.length; i++) {
            cb[i].setChecked(false);
        }
    }
    //初始化控件
    public void initView(final View view){
        Log.e("复选initView","复选initView执行了");
        //获取题干
        question_stem=view.findViewById(R.id.question_item2);
        //单选控件
        cb[0]=view.findViewById(R.id.boxs1);
        cb[1]=view.findViewById(R.id.boxs2);
        cb[2]=view.findViewById(R.id.boxs3);
        cb[3]=view.findViewById(R.id.boxs4);
        cb[4]=view.findViewById(R.id.boxs5);
    }
    //更新题目
    public void nextQuestion(Question question){
        Log.e("复选nextQuestion","nextQuestion执行了");
        //设置题干
        Log.e("a",question.getQuestionStem());
        question_stem.setText(question.getQuestionStem());
        //设置选项
        for (int i=0;i<cb.length;i++){
            //所有选项初始都未选中
            cb[i].setChecked(false);
            //设置选项内容
            cb[i].setText(question.getOptions()[i]);
            //设置背景颜色
            cb[i].setBackgroundResource(R.drawable.select_button_text);
            //设置字体颜色
            cb[i].setTextColor(getResources().getColor(R.color.black));
        }
    }
    //判断选择结果
    public int getResult(Question question){
        //得到正确的选项的下标数组
        String[] correctOptions = question.getCorrectOptions().split(",");
        boolean answer = true; //记录正确答案是否选择
        int checkednum = 0;  //选择的选项个数
        for(int i = 0; i < cb.length; i++){
            if(cb[i].isChecked()){
                checkednum++;  //选项个数增加
            }
        }
        if(checkednum == 0){
            Toast.makeText(getContext(),"请选择答案！",Toast.LENGTH_SHORT).show();
            result = -1;
        }else{
            for(int i=0;i< cb.length;i++){
                cb[i].setBackgroundResource(R.drawable.shape_radiobutton2);
            }
            if(checkednum==correctOptions.length){
                for (String correctOption : correctOptions) {
                    //判断对应的选项是否被选择
                    boolean now = cb[Integer.parseInt(correctOption)].isChecked();
                    answer = answer && now;
                }
            }else {
                answer=false;
            }
            if(answer){
                for (String correctOption : correctOptions) {
                    //判断对应的选项是否被选择
                    CheckBox c = cb[Integer.parseInt(correctOption)];
                    c.setBackgroundResource(R.drawable.shape_success_answer);
                    c.setTextColor(getResources().getColor(R.color.success));
                }
                result = 1;
            }else{
                for (CheckBox checkBox : cb) {
                    if (checkBox.isChecked()) {
                        checkBox.setBackgroundResource(R.drawable.shape_error_answer);
                        checkBox.setTextColor(getResources().getColor(R.color.error));
                    }
                }
                showCorrectAnswer(correctOptions);
                result = 0;
            }
        }

        return result;
    }
    //显示正确答案的dialog
    private void showCorrectAnswer(String[] correctOptions) {
        //得到正确答案
        String answer = "";
        for (String correctOption : correctOptions) {
            answer += cb[Integer.parseInt(correctOption)].getText().toString() + "\n";
        }
        AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
        builder.setTitle("正确答案")
                .setMessage(answer)
                .setNegativeButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                    }
                });
        builder.create().show();
    }

}

4、QuestionActivity.java

public class QuestionActivity extends AppCompatActivity {
    private int score=0;//答题分数
    private final List<Question>questions=new ArrayList<>();//题目集合
    private int i=0;//当前题号
    private int previousType;//上一题题目类型，单选为1，多选为2
    private int result;//答题结果，正确为1，错误为0，未答题为2
    private Button button;//提交按钮
    private RadioButtonFragment radioButtonFragment;//单选按钮对象
    private ChexBoxFragment chexBoxFragment;
    private TextView time;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_question);
        //初始化题目
        initQuestions();
        //初始化控件
        initView();
        //根据题形加载第一题
        Question question=questions.get(0);
        Log.e("question", "可以获取题目");
        if (question.getQuestionTypes()==1){
            //给出题目的类型
            radioButtonFragment.setQuestion(question);
            replaceFragment(radioButtonFragment);
            previousType=1;//当前题型为1，为单选题
        }else {
            chexBoxFragment.setQuestion(question);
            replaceFragment(chexBoxFragment);
            previousType=2;//当前题型为2，为多选题
        }
    }
     CountDownTimer countDownTimer=new CountDownTimer(120000, 1000) {
        public void onTick(long millisUntilFinished) {
            time.setText("剩余时间 " + millisUntilFinished / 1000+"s");
        }
        public void onFinish() {
            time.setText("时间到!");
        }
    }.start();

    //替换fragment方法
    private void replaceFragment(Fragment Fragment) {
        FragmentManager manager=getSupportFragmentManager();
        FragmentTransaction transaction=manager.beginTransaction();
        transaction.replace(R.id.fragment1,Fragment);
        transaction.commit();
    }

    public void initQuestions(){
        Log.e("信息更新", "执行了");
        Question question=new Question();
        //题干
        question.setQuestionStem("1、哪个季节天气最热？");
        //选项
        question.setOptions(new String[]{"春","夏","秋","冬"});
        //正确的答案
        question.setCorrectOptions("1");
        //题目类型
        question.setQuestionTypes(1);
        //把题目添加到集合中
        questions.add(question);

        Question question2=new Question();
        //题干
        question2.setQuestionStem("2、坤坤喜欢的运动是什么？");
        //选项
        question2.setOptions(new String[]{"唱","跳","rap","篮球","music"});
        //正确的答案
        question2.setCorrectOptions("1,2");
        //题目类型
        question2.setQuestionTypes(2);
        //把题目添加到集合中
        questions.add(question2);

        Question question3=new Question();
        //题干
        question3.setQuestionStem("3、属于前端的是？");
        //选项
        question3.setOptions(new String[]{"html","css","java","orcale","mysql"});
        //正确的答案
        question3.setCorrectOptions("0,1");
        //题目类型
        question3.setQuestionTypes(2);
        //把题目添加到集合中
        questions.add(question3);

        Question question4=new Question();
        //题干
        question4.setQuestionStem("4、属于后端的是？");
        //选项
        question4.setOptions(new String[]{"java","c","ppt","world","excel"});
        //正确的答案
        question4.setCorrectOptions("0,1");
        //题目类型
        question4.setQuestionTypes(2);
        //把题目添加到集合中
        questions.add(question4);

        Question question5=new Question();
        //题干
        question5.setQuestionStem("5、我使用的手机品牌是？");
        //选项
        question5.setOptions(new String[]{"苹果","化为","OPPO","VIVO"});
        //正确的答案
        question5.setCorrectOptions("3");
        //题目类型
        question5.setQuestionTypes(1);
        //把题目添加到集合中
        questions.add(question5);
    }
    public void initView(){
        //找到对应控件
        button=findViewById(R.id.submit);
        radioButtonFragment=new RadioButtonFragment();
        chexBoxFragment=new ChexBoxFragment();
        time=findViewById(R.id.time);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //如果是提交按钮，根据当前题目类型，调用getResult（）
                if(button.getText().equals("提交")){
                    if(questions.get(i).getQuestionTypes()==1){
                        result=radioButtonFragment.getResult(questions.get(i));
                    }else {
                        result=chexBoxFragment.getResult(questions.get(i));
                    }
                    //如果答对了就+1分
                    if(result==1){
                        score++;
                    }
                    //如果不是第五题，就改文本为下一题，如果是第五题，就修改文本为结束
                    if(i==4){
                        button.setText("结束");
                    }else if(result!=-1){
                        button.setText("下一题");
                    }
                }else {

                    //如果是下一题按钮，题号增加，判断你是否已经答题完成
                    i++;
                    if(i<questions.size()){
                        //根据上一题类型，选择是否替换fragment
                        if(questions.get(i).getQuestionTypes()==1){
                            if (previousType!=1){
                                chexBoxFragment.clearChoice();
                                radioButtonFragment.setQuestion(questions.get(i));
                                replaceFragment(radioButtonFragment);
                                previousType=1;
                            }else {
                                radioButtonFragment.nextQuestion(questions.get(i));
                            }
                        }else {
                            if(previousType!=2){
                                radioButtonFragment.clear();
                                chexBoxFragment.setQuestion(questions.get(i));
                                replaceFragment(chexBoxFragment);
                                previousType=2;
                            }else {
                                chexBoxFragment.nextQuestion(questions.get(i));
                            }
                        }
                        button.setText("提交");
                    }else {
                        showDialog();
                        button.setVisibility(View.INVISIBLE);
                    }
                }
            }
        });
    }
    //显示答题结束的页面
    private void showDialog(){
        AlertDialog.Builder builder=new AlertDialog.Builder(QuestionActivity.this);

        builder.setTitle("提示");
        builder.setMessage("答题结束得分"+score);
        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Intent intent=new Intent(QuestionActivity.this,QuestionActivity.class);
                startActivity(intent);
            }
        });
        builder.create().show();
    }
}

四、部分样式

1、select_button_text.xml

按压样式

<selector xmlns:android="http://schemas.android.com/apk/res/android">
<!--        按钮选中状态-->
        <item android:state_checked="true" android:drawable="@drawable/shape_radiobutton"></item>
<!--        按钮未选中状态-->
        <item android:state_checked="false" android:drawable="@drawable/shape_radiobutton2"></item>
    </selector>

2、shape_radiobutton.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <!--    大小-->
    <size android:height="50dp" android:width="50dp"></size>
    <!--    颜色-->
    <solid android:color="@color/teal_200"></solid>
    <!--    描边-->
    <stroke android:color="@color/black" android:width="1dp"
        android:dashWidth="3dp" android:dashGap="1dp"></stroke>
    <!--    角半径-->
    <corners android:radius="5dp"></corners>
</shape>

3、shape_radiobutton2.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <size android:width="50dp" android:height="50dp"></size>
    <solid android:color="@color/white"></solid>
    <stroke android:color="@color/black" android:width="1dp"></stroke>
    <corners android:radius="5dp"></corners>
</shape>

4、shape_success_answer.xml

回答正确选项颜色

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <size android:width="50dp" android:height="50dp"></size>
    <solid android:color="#D00CA5EA"></solid>
    <corners android:radius="5dp"></corners>
</shape>

5、shape_error_answer.xml

回答错误选项颜色

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <size android:width="50dp" android:height="50dp"></size>
    <solid android:color="#A3F44336"></solid>
    <corners android:radius="5dp"></corners>
</shape>