[英]Error: OnCheckedChangeListener cannot be resolved to a type
I have red lines under setOnCheckedChangeListener and OnCheckedChangeListener. 我在setOnCheckedChangeListener和OnCheckedChangeListener下有红线。 The error message is telling me: Multiple Markers at this line - OnCheckedChangedListener cannot be resolved to a type - the method setOnCheckedChangedListener(RadioGroup.OnCheckedChangeListener) in the type RadioGroup is not applicable for the arguments (new OnCheckedChangeListener(){})
错误消息告诉我:此行有多个标记-OnCheckedChangedListener无法解析为一种类型-RadioGroup类型的setOnCheckedChangedListener(RadioGroup.OnCheckedChangeListener)方法不适用于自变量(新的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");
}
}
});
}
}
Two possibilities: 两种可能性:
Change to RadioGroup.OnCheckedChangeListener
更改为
RadioGroup.OnCheckedChangeListener
Add this to the start of your class: 将此添加到课程的开头:
import android.widget.RadioGroup.OnCheckedChangeListener;
As for DisplayToast
, add the following: 至于
DisplayToast
,添加以下内容:
public void displayToast(String text){
Toast.makeText(this, text, Toast.Toast.LENGTH_SHORT).show();
}
And change DisplayToast
to displayToast
in your code. 并在代码中将
DisplayToast
更改为displayToast
。 Method names should start with a lower-case letter by convention. 按照惯例,方法名称应以小写字母开头。 Only class names should start with an upper-case letter.
只有类名才能以大写字母开头。
You need to import 您需要导入
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
Import these Two class/interface. 导入这两个类/接口。
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
This code may help for OnChacked Changed 此代码可能对OnChacked Changed有帮助
//buttonView.getId()
is used to get the ids of Button //buttonView.getId()
用于获取Button的ID //boolean isChecked
is used that button is Checked or not //boolean isChecked
用于表示按钮是否被选中
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { if (isChecked) { switch (buttonView.getId()) { case R.id.radioA1: DisplayToast("No, not at all"); radioA2.setChecked(false); break; case R.id.radioA2: DisplayToast("On some days") radioA1.setChecked(false); break; ..... ..... default: break; } }
} }
I had the same problem and solved it this way: 我遇到了同样的问题,并通过以下方式解决了问题:
Just change 只是改变
.setOnCheckedChangeListener(new OnCheckedChangeListener(){...
to 至
.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){...
and it will be working! 它将起作用!
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.