如何在单击“下一步”按钮时检查单选按钮值

Question

我有四个单选按钮，下一个按钮和一个问题。现在我的问题是，如果用户在没有选择任何选项的情况下单击next按钮，它应该显示一条toast消息，如果用户单击任何一个单选按钮，则应该检查它是正确还是错误。我已经部分实现了，但是我不能得到确切的解决方案。有没有人能帮我。

提前感谢

我已经在下面发布了我的代码

Next.setOnClickListener(new View.OnClickListener() 
     {
         @Override
            public void onClick(View v) 
            {
                // TODO Auto-generated method stub



                count++;

                if(viewFlipper.getDisplayedChild()==0)
                {
                    id1 = rag1.getCheckedRadioButtonId();
                    rab1=(RadioButton)findViewById(id1);
                    //System.out.println("1nd question answer"+rab1.getText());

                    if (rag1.getCheckedRadioButtonId()!=R.id.btn1_1||rag1.getCheckedRadioButtonId()!=R.id.btn1_2||rag1.getCheckedRadioButtonId()!=R.id.btn1_3||rag1.getCheckedRadioButtonId()!=R.id.btn1_4||rag1.getCheckedRadioButtonId()!=R.id.btn1_5&&rag1.getCheckedRadioButtonId()==-1)
                    {
                        Toast.makeText(getApplicationContext(), "Please enter the  answer", Toast.LENGTH_SHORT).show();
                    }



                     if((rag1.getCheckedRadioButtonId()!=-1)&&rab1.getText().equals(c_alcorrectanswer.get(0)))
                     {
                         System.out.println("1nd question answer"+rab1.getText());
                     }

                    else
                    {
                        Toast.makeText(getApplicationContext(), "Please enter the correct answer", Toast.LENGTH_SHORT).show();
                        viewFlipper.stopFlipping();
                    }



                }

Answer 1

您应该只在一个条件内进行检查。您的RadioGroup中的任何RadioButton是否被选中。

  int radioButtonID = radioButtonGroup.getCheckedRadioButtonId();
  if(radioButtonID > 0) //return -1 if none of radiobutton is selected from radiogroup
   {
     //move to next
   }
  else
  {
   // show toast. Please select any option.
  }

根据您的代码片段：

if(viewFlipper.getDisplayedChild()==0)
{
 id1 = rag1.getCheckedRadioButtonId();
    if(id1 < 0) //return -1 if none of radio button is selected
     {
     //Toast. Please select any answer
     }
 }

developer.android.com documentation reference