Android 复选框CheckBox 设置只能选中其中一个

package com.example.checkboxdemo;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.CheckBox;
import android.widget.CompoundButton;
public class MainActivity extends AppCompatActivity implements CompoundButton.OnCheckedChangeListener {
    private CheckBox ck1;
    private CheckBox ck2;
    private CheckBox ck3;
    private CheckBox ck4;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ck1=findViewById(R.id.ck1);
        ck2=findViewById(R.id.ck2);
        ck3=findViewById(R.id.ck3);
        ck4=findViewById(R.id.ck4);
        ck1.setOnCheckedChangeListener(this);
        ck2.setOnCheckedChangeListener(this);
        ck3.setOnCheckedChangeListener(this);
        ck4.setOnCheckedChangeListener(this);
    }
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        switch (buttonView.getId()){
            case R.id.ck1:
                if (ck1.isChecked()){
                    //setChecked(),更改此按钮的选中状态 如果为false,则不能选中该控件
                    ck2.setChecked(false);
                    ck3.setChecked(false);
                    ck4.setChecked(false);
                }
                break;
            case R.id.ck2:
                if (ck2.isChecked()){
                    ck1.setChecked(false);
                    ck3.setChecked(false);
                    ck4.setChecked(false);
                }
                break;
            case R.id.ck3:
                if (ck3.isChecked()){
                    ck1.setChecked(false);
                    ck2.setChecked(false);
                    ck4.setChecked(false);
                }
                break;
            case R.id.ck4:
                if (ck4.isChecked()){
                    ck1.setChecked(false);
                    ck2.setChecked(false);
                    ck3.setChecked(false);
                }
                break;
            default:
                break;
        }
    }
}