如果未选中单选按钮，则阻止表单提交

Question

使用教育Android应用程序。一个通过EditText输入，单选按钮和CheckBox提供答案。

我希望检查RadioGroup，当没有点击RadioButton时，它会提示学生并阻止提交。我成功EditText但未成功RadioButton。

public void checkEmptyButtons(View view){
  RadioGroup rg = (RadioGroup) findViewById(R.id.myRg);
    if (rg.getCheckedRadioButton()==-1{

    // this is where I have a problem
    //I don't even know how to search on the                     //dev.anderoid site
        }
    }

那个被困的地方。提前致谢

Answer 1

使用getCheckedRadioButtonId()代替getCheckedRadioButton()。

if (rg.getCheckedRadioButtonId() == -1) {
    //no radio buttons are checked
}
else {
    //any one of the radio buttons is checked
}

Answer 2

你需要radioGroup checked Change Listener：

rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
              //here you will get callback everytime radio button is checked along with id. You can have boolean checked here to know if any of your radio button is checked


            }
        });