无线电组检查的ID值错误-1

Question

我想从RadioButton访问RadioGroup，

int selectedId = radioFeeGroup.getCheckedRadioButtonId();

radioFeeButton = (RadioButton) findViewById(selectedId);

我得到selectedId值-1。这就是为什么应用程序崩溃的原因。

Answer 1

请确保您从组中选择了至少一个单选按钮。

See the Document

您的代码正确，

int selectedId = radioFeeGroup.getCheckedRadioButtonId();

radioFeeButton = (RadioButton) findViewById(selectedId);

  

    

如果您已经选择了RadioButton，则清理项目并再次重建，如果您从xml正确访问RadioGroup，它应该可以工作。

  

Answer 2

检查

 radioFeeGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {

                @Override
                public void onCheckedChanged(RadioGroup group, int checkedId) {
                    int radioButtonID = radioFeeGroup.getCheckedRadioButtonId();
                    View radioButton = radioFeeGroup.findViewById(radioButtonID);
                    int position = group.indexOfChild(radioButton);
                }
            });

检查此示例

How to get the id of selected radio button in android?

How to get id of selected radio button in a radio group