java - 错误:OnCheckedChangeListener无法解析为一种类型

我在setOnCheckedChangeListener和OnCheckedChangeListener下有红线。错误消息告诉我：这行有多个标记-OnCheckedChangedListener无法解析为一种类型-RadioGroup类型的setOnCheckedChangedListener（RadioGroup.OnCheckedChangeListener）方法不适用于参数（new OnCheckedChangeListener（）{}）

package com.lifematters;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

public class Test1 extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.test1);

    //define Navigation Image Buttons
    final Button nextBtn = (Button) findViewById(R.id.btnNext);



    RadioGroup radioGroup = (RadioGroup) findViewById(R.id.radioAnswers1);
    radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener()
    {
        public void onCheckedChanged (RadioGroup group, int checkedId){

        final RadioButton radioButton1 = (RadioButton) findViewById(R.id.radioA1);
        final RadioButton radioButton2 = (RadioButton) findViewById(R.id.radioA2);
        final RadioButton radioButton3 = (RadioButton) findViewById(R.id.radioA3);
        final RadioButton radioButton4 = (RadioButton) findViewById(R.id.radioA4);

        if (radioButton1.isChecked()) {
            DisplayToast("No, not at all");

        } else if (radioButton2.isChecked()) {
            DisplayToast("On some days");

        }else if (radioButton3.isChecked()) {
            DisplayToast("On more than half the days");

        }else {
            DisplayToast("Nearly everyday");
        }
    }

  });


  }

}

最佳答案

两种可能性：


更改为RadioGroup.OnCheckedChangeListener
将此添加到课程的开头：

import android.widget.RadioGroup.OnCheckedChangeListener;

对于DisplayToast，添加以下内容：

public void displayToast(String text){
    Toast.makeText(this, text, Toast.Toast.LENGTH_SHORT).show();
}

并在代码中将DisplayToast更改为displayToast。按照惯例，方法名称应以小写字母开头。仅类别名称应以大写字母开头。