如何取消选中或重置单选按钮? [英] How can I uncheck or reset the radio button?

问题描述

我正在开发基于测验的应用程序.当用户打开此应用程序单选按钮时，将有1个问题和4个选项(单选按钮)被取消选中，但是当用户回答1个任务并且他去进行下一个任务单选按钮时，将出现问题.我想取消/重置每个问题的单选按钮.我该怎么办?

I am developing an quiz based app. There will be 1 question and 4 option (radio buttons) when user opens this app radio button will be unchecked but the problem comes when the user answers 1 quest and when he goes for next quest radio button will be checked. I want to uncheck/reset the radio buttons for every question. How can I do it?

  answ1=new ArrayList<String>(new ArrayList<String>(answ1));
        btn_practice1.setText(answ1.get(0));
        btn_practice2.setText(answ1.get(1));
        btn_practice3.setText(answ1.get(2));
        btn_practice4.setText(answ1.get(3));
        btn_practicerg.setOnCheckedChangeListener(new OnCheckedChangeListener(){
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {             
                RadioButton radioButton = (RadioButton)group. findViewById(checkedId); //line 262
                String temp = radioButton.getText().toString();
                switch(btn_practicerg.getCheckedRadioButtonId()){
                case R.id.RB1:
                    if (btn_practice1.isChecked()){
                        btn_practice2.setChecked(false);
                        btn_practice3.setChecked(false);
                        btn_practice4.setChecked(false);
                    }
                   break;
                case R.id.RB2:
                    if (btn_practice2.isChecked()){
                        btn_practice1.setChecked(false);
                        btn_practice3.setChecked(false);
                        btn_practice4.setChecked(false);
                    }                    
                    break;
                case R.id.RB3:
                    if (btn_practice3.isChecked()){
                        btn_practice1.setChecked(false);
                        btn_practice2.setChecked(false);
                        btn_practice4.setChecked(false);
                    }
                    break;
                case R.id.RB4:
                    if (btn_practice4.isChecked()){
                        btn_practice1.setChecked(false);
                        btn_practice2.setChecked(false);
                        btn_practice3.setChecked(false);
                    }                   
                    break;
                default:
                    btn_practice1.setChecked(false);
                    btn_practice2.setChecked(false);
                    btn_practice3.setChecked(false);
                    btn_practice4.setChecked(false);
                }  
        ImageView nextBtn = (ImageView) findViewById(R.id.nxt_btn);
    nextBtn.setOnClickListener(new Button.OnClickListener(){
    public void onClick(View v){
         btn_practicerg.clearCheck();  //line 355
              }
             });

Logcat

     E/AndroidRuntime(729):at    
      com.example.TEENEINSTIEN.Question$LoadQuestions$2.onCheckedChanged(Question.java:262)
      E/AndroidRuntime(729):at android.widget.RadioGroup.setCheckedId(RadioGroup.java:172)
      E/AndroidRuntime(729):at android.widget.RadioGroup.check(RadioGroup.java:166)
      E/AndroidRuntime(729):at android.widget.RadioGroup.clearCheck(RadioGroup.java:205)
      E/AndroidRuntime(729):at   
      com.example.TEENEINSTIEN.Question$LoadQuestions$3.onClick(Question.java:355)
      E/AndroidRuntime(729):at android.view.View.performClick(View.java:2485)
      E/AndroidRuntime(729):at android.view.View$PerformClick.run(View.java:9080)

                 

我尝试这样，但是我不能取消选中..

I try like this, but I can't uncheck..

推荐答案

我认为问题是使用btn_practicerg 对象，即如果您每次显示新问题时都在创建新的RadioGroup对象，则必须在新的 btn_practicerg 对象上执行 RadioGroup.clearCheck()，而不是我认为您当前正在执行的旧对象.

I think the problem is with btn_practicerg object i.e if you are creating new RadioGroup object everytime you display a new question then you have to execute RadioGroup.clearCheck() on new btn_practicerg object instead of old one that I think you are doing currently.

更好:

    btn_practice1.setText(answ1.get(0));
    btn_practice2.setText(answ1.get(1));
    btn_practice3.setText(answ1.get(2));
    btn_practice4.setText(answ1.get(3));
    btn_practice1.setChecked(false);
    btn_practice2.setChecked(false);
    btn_practice3.setChecked(false);
    btn_practice4.setChecked(false);

取消选中开头的所有按钮.我希望这能解决您的问题.

to uncheck all the buttons in the beginning. I hope this will solve your problem.

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