public class MainActivity extends AppCompatActivity {

    private BeanTest beanTest;
    private TextView tv_title;
    private RadioGroup rg_test;
    private RadioButton rb_1;
    private RadioButton rb_2;
    private RadioButton rb_3;
    private RadioButton rb_4;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ListView lv = findViewById(R.id.lv);
        List<BeanTest> list=new ArrayList<BeanTest>();
        initlist(list);


        lv.setAdapter(new MyAdapter(list));


    }

    private List<BeanTest> initlist(List<BeanTest> list) {
      for (int i=0;i<50;i++){
          beanTest = new BeanTest("题目"+i+":","选项--^_^--1","选项--^_^--2","选项--^_^--3","选项--^_^--4",false);
          list.add(beanTest);
         // beanTest.setTitle("");

      }

        return list;
    }

    private class MyAdapter extends BaseAdapter{
        private  List<BeanTest> list=null;


        public MyAdapter(List list) {
            this.list=list;
        }

        @Override
        public int getCount() {
            return list!=null? list.size():0;
        }

        @Override
        public BeanTest getItem(int i) {
            return list.get(i);
        }

        @Override
        public long getItemId(int i) {
            return i;
        }

        @Override
        public View getView(final int i, View view, ViewGroup viewGroup) {
            if (view==null){
                view= View.inflate(MainActivity.this, R.layout.item_test, null);

            }
            rg_test = view.findViewById(R.id.rg_test);
            // 精髓-- 一定要先将RadioGroup中的监听事件设置为null，在设置初始化，最后在设置自己的监听事件.  原因是RadioGroup本身会监听这个事件和
            //          你设不设定回调没什么关系。 如果你不设置未null，在初始化的过程中会调用系统的回调。导致错乱！！！！
            rg_test.setOnCheckedChangeListener(null);

            tv_title = view.findViewById(R.id.tv_title);
            tv_title.setText(list.get(i).getTitle());

            rb_1 = view.findViewById(R.id.rb_1);
            rb_1.setText(getItem(i).getContent_1());

            rb_2 = view.findViewById(R.id.rb_2);
            rb_2.setText(getItem(i).getContent_2());

            rb_3 = view.findViewById(R.id.rb_3);
            rb_3.setText(getItem(i).getContent_3());

            rb_4 = view.findViewById(R.id.rb_4);
            rb_4.setText(getItem(i).getContent_4());

            if (getItem(i).isChecked()){
                RadioButton radioButton = (RadioButton) rg_test.getChildAt(getItem(i).getIndex());
                radioButton.setChecked(true);
            }else {
                //重点是这里 ---  需要清空RadioGroup中的check状态
                rg_test.clearCheck();
            }


            rg_test.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(RadioGroup radioGroup, int x) {
                    Log.e("gzm","gzm----"+x);
                    switch (x){
                        case R.id.rb_1:
                            getItem(i).setIndex(0);
                            getItem(i).setChecked(true);
                            break;
                        case R.id.rb_2:
                            getItem(i).setIndex(1);
                            getItem(i).setChecked(true);
                            break;
                        case R.id.rb_3:
                            getItem(i).setIndex(2);
                            getItem(i).setChecked(true);
                            break;
                        case R.id.rb_4:
                            getItem(i).setIndex(3);
                            getItem(i).setChecked(true);
                            break;
                        default:
                            break;
                    }
                }
            });
            return view;
        }
    }
}

 public  class BeanTest {
    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public BeanTest(String title) {
        this.title = title;
    }


    public BeanTest(String title, String content_1, String content_2, String content_3, String content_4,boolean isChecked) {
        this.title = title;
        this.content_1 = content_1;
        this.content_2 = content_2;
        this.content_3 = content_3;
        this.content_4 = content_4;
        this.isChecked=isChecked;
    }

    String title;

    public String getContent_1() {
        return content_1;
    }

    public void setContent_1(String content_1) {
        this.content_1 = content_1;
    }

    public String getContent_2() {
        return content_2;
    }

    public void setContent_2(String content_2) {
        this.content_2 = content_2;
    }

    public String getContent_3() {
        return content_3;
    }

    public void setContent_3(String content_3) {
        this.content_3 = content_3;
    }

    public String getContent_4() {
        return content_4;
    }

    public void setContent_4(String content_4) {
        this.content_4 = content_4;
    }

    String content_1;
    String content_2;
    String content_3;
    String content_4;

    public int getIndex() {
        return index;
    }

    public void setIndex(int index) {
        this.index = index;
    }

    public boolean isChecked() {
        return isChecked;
    }

    public void setChecked(boolean checked) {
        isChecked = checked;
    }

    int index;
   private boolean isChecked;

}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/tv_title"
        android:text="测试标题"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />


    <RadioGroup
        android:id="@+id/rg_test"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <RadioButton
            android:id="@+id/rb_1"
      android:layout_width="match_parent"
      android:layout_height="wrap_content" />

        <RadioButton
            android:id="@+id/rb_2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
        <RadioButton
            android:id="@+id/rb_3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
        <RadioButton
            android:id="@+id/rb_4"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </RadioGroup>


</LinearLayout>