android - 如何取消选中或清除单选按钮组？

Question

我是安卓新手..

我在取消选中组中的单选按钮时遇到问题....

我的问题是......

我正在开发一个基于测验的应用程序。将有 1 个任务和 4 个选项(单选按钮)当用户打开此应用程序时，单选按钮将被取消选中，但当用户回答 1 个任务并且当他进行下一个任务时，单选按钮将被选中。我想取消选中/为每个任务重置单选按钮。我该怎么做？

我面临的另一个问题是......如果假设用户选择了第一个按钮并且他想再次更改选项所以他选择了另一个他应该无法选择的按钮..

如何实现？

如有任何帮助，我们将不胜感激。

    protected void onPostExecute(String file_url) {
        pDialog.dismiss();
     ques1=new ArrayList<String>(new ArrayList<String>(ques1));
        //  j=0;
        TextView txtque = (TextView) findViewById(R.id.que_txt); 
        txtque.setText(ques1.get(j));
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) findViewById(checkedId);   // error       
                                                                          //  is here 205 line..
                String temp = radioButton.getText().toString();
                crrtans=new ArrayList<String>(new ArrayList<String>(crrtans));
                if (temp.equals(crrtans.get(l))){
                TextView txtRadio = (TextView) findViewById(R.id.rdtxt); 
                txtRadio.setText("" + radioButton.getText() + " IS CORRECT");   
                txtRadio.setTextColor(Color.parseColor("#008000"));
            }else{
                //RadioButton radioButton1 = (RadioButton) findViewById(checkedId);
                   // Toast.makeText(Question.this, "" + radioButton.getText(), 2000).show(); 
                    TextView txtRadio = (TextView) findViewById(R.id.rdtxt); 
                    txtRadio.setText("" + radioButton.getText() + "is INCORRECT");
                    txtRadio.setTextColor(Color.parseColor("#FF0000"));
            }
            }
     });
    Button nextBtn = (Button) findViewById(R.id.nxt_btn);
    nextBtn.setOnClickListener(new Button.OnClickListener(){
      public void onClick(View v){
    //    btn_practicerg.clearCheck();
          if (j == ques1.size() -1) {
                //finish();
                showAlert1();
            }
          else{ 
            ++j;
            TextView txtque = (TextView) findViewById(R.id.que_txt); 
            txtque.setText(ques1.get(j));
            ++k;
            btn_practice1.setText(answ1.get((k*4)+0));
            btn_practice2.setText(answ1.get((k*4)+1));
            btn_practice3.setText(answ1.get((k*4)+2));
            btn_practice4.setText(answ1.get((k*4)+3));
          }
          btn_practicerg.clearCheck();
          btn_practicerg.setOnCheckedChangeListener(new OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(RadioGroup group, int checkedId) { 
                    RadioButton radioButton = (RadioButton) findViewById(checkedId);
                    String temp = radioButton.getText().toString();
                    l++;
                    if (temp.equals(crrtans.get(l))){
                    TextView txtRadio = (TextView) findViewById(R.id.rdtxt); 
                    txtRadio.setText("" + radioButton.getText() + " IS CORRECT");   
                    txtRadio.setTextColor(Color.parseColor("#008000"));
                }else{
                    //RadioButton radioButton1 = (RadioButton) findViewById(checkedId);
                       // Toast.makeText(Question.this, "" + radioButton.getText(), 2000).show(); 
                        TextView txtRadio = (TextView) findViewById(R.id.rdtxt); 
                        txtRadio.setText("" + radioButton.getText() + " IS INCORRECT");
                        txtRadio.setTextColor(Color.parseColor("#FF0000"));
                }
                }      
         });
     }
});   
    Button previousbtn = (Button) findViewById(R.id.prv_btn);
    previousbtn.setOnClickListener(new Button.OnClickListener(){
    public void onClick(View v){
        if (j <= 0) {
            Toast.makeText(Question.this, "First Question",Toast.LENGTH_SHORT).show();
            } else {
            --j;
            TextView txtque = (TextView) findViewById(R.id.que_txt); 
            txtque.setText(ques1.get(j));
            --k;
            btn_practice1.setText(answ1.get((k*4)+0));
            btn_practice2.setText(answ1.get((k*4)+1));
            btn_practice3.setText(answ1.get((k*4)+2));
            btn_practice4.setText(answ1.get((k*4)+3));
            }
         btn_practicerg.clearCheck();
         btn_practicerg.setOnCheckedChangeListener(new OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(RadioGroup group, int checkedId) { 
                    RadioButton radioButton = (RadioButton) findViewById(checkedId);
                    String temp = radioButton.getText().toString();
                    l--;
                    if (temp.equals(crrtans.get(l))){
                    TextView txtRadio = (TextView) findViewById(R.id.rdtxt); 
                    txtRadio.setText("" + radioButton.getText() + " IS CORRECT");   
                    txtRadio.setTextColor(Color.parseColor("#008000"));
                }else{
                    //RadioButton radioButton1 = (RadioButton) findViewById(checkedId);
                       // Toast.makeText(Question.this, "" + radioButton.getText(), 2000).show(); 
                        TextView txtRadio = (TextView) findViewById(R.id.rdtxt); 
                        txtRadio.setText("" + radioButton.getText() + " IS INCORRECT");
                        txtRadio.setTextColor(Color.parseColor("#FF0000"));
                }
                }      
         });
         }
    });
    }

Logcat

            E/AndroidRuntime(893): FATAL EXCEPTION: main
            E/AndroidRuntime(893): java.lang.ArrayIndexOutOfBoundsException
            E/AndroidRuntime(893):  at java.util.ArrayList.get(ArrayList.java:313)
            E/AndroidRuntime(893):  at 
         com.example.finalpractice.Question$LoadQuestions$2$1.onCheckedChanged(Question.java:243)
            E/AndroidRuntime(893):  at 
         android.widget.RadioGroup.setCheckedId(RadioGroup.java:172)
            E/AndroidRuntime(893):  at android.widget.RadioGroup.access$600(RadioGroup.java:52)
            E/AndroidRuntime(893):  at 
         android.widget.RadioGroup$CheckedStateTracker.onCheckedChanged(RadioGroup.java:342)
            E/AndroidRuntime(893):  at 
         android.widget.CompoundButton.setChecked(CompoundButton.java:127)
            E/AndroidRuntime(893):  at 
         android.widget.CompoundButton.toggle(CompoundButton.java:86)
            E/AndroidRuntime(893):  at android.widget.RadioButton.toggle(RadioButton.java:72)
            E/AndroidRuntime(893):  at 
         android.widget.CompoundButton.performClick(CompoundButton.java:98)
            E/AndroidRuntime(893):  at android.view.View$PerformClick.run(View.java:9080)
            E/AndroidRuntime(893):  at android.os.Handler.handleCallback(Handler.java:587)
            E/AndroidRuntime(893):  at android.os.Handler.dispatchMessage(Handler.java:92)

Answer 1

在我的例子中，我有一个名为 rb 的单选组和 2 个单选按钮(rbY，rbN)在里面。

---

所以，这是我使用 onClickListener 的实现:

final RadioGroup rb = (RadioGroup) convertView.findViewById(R.id.creditcards);
                RadioButton rbY = (RadioButton) convertView.findViewById(R.id.radioButton);
                RadioButton rbN = (RadioButton) convertView.findViewById(R.id.radioButton2);

                final View finalConvertView = convertView;

                rbY.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        int selected = rb.getCheckedRadioButtonId();
                        RadioButton rbYes = (RadioButton) finalConvertView.findViewById(selected);
                        RadioButton rbN = (RadioButton) finalConvertView.findViewById(R.id.radioButton2);

                        if (rbYes.isSelected()) {
                            rbYes.setSelected(false);
                            rb.clearCheck();
                            rb.clearChildFocus(rbYes);
                        } else {
                            rbYes.setSelected(true);
                        }
                    }
                });

                rbN.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        int selected = rb.getCheckedRadioButtonId();
                        RadioButton rbNo = (RadioButton) finalConvertView.findViewById(selected);

                        if (rbNo.isSelected()) {
                            rbNo.setSelected(false);
                            rb.clearCheck();
                            rb.clearChildFocus(rbNo);
                        }
                        else {
                            rbNo.setSelected(true);
                        }
                    }
                });