Question

这是我的编码。我不知道如何验证单选按钮。当我单击下一个按钮时，即使没有单击单选按钮，它仍然可以继续。抱歉我的英语不好。请帮帮我。谢谢。

protected void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_dengue_ques2);

    radioGroup = (RadioGroup) findViewById(R.id.radioGroupDengue2);
    yes2 = (RadioButton) findViewById(R.id.radioButtonQues2); //the answer is yes
    no2 = (RadioButton) findViewById(R.id.radioButtonQues2No); //the answer is no

    Next=(Button) findViewById(R.id.buttonNextQues2); 

    yes2.setSelected(true);
    radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(RadioGroup radioGroup, int i) {
            if (i == R.id.radioButtonQues2)
            {
                selectedType = yes2.getText().toString();
            }
            else if (i == R.id.radioButtonQues2No)
            {
                selectedType = no2.getText().toString();
            }
            /* this part does not work
            else if (i == R.id.radioButtonQues2.isChecked(false) && 
                     i ==  R.id.radioButtonQues2No.isChecked(false))
            {
             Toast.makeText(this, "Please choose 1 answer", 
                                   Toast.LENGTH_SHORT).show(); 
            }*/
        }
    });

    Next.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {

            Intent intent = new Intent(dengueQues2.this, dengueQues3.class);
            intent.putExtra("REST2", selectedType);
            startActivity(intent);
        }
    });
}

    public void onClickYes2 (View view)
    {
        Toast.makeText(this, "You have select 1 to 3 days.",Toast.LENGTH_SHORT).show();
    }

    public void onClickNo2 (View view)
    {
        Toast.makeText(this, "You have select 3 to 14 days.", Toast.LENGTH_SHORT).show();
    }

Answer 1

您需要使用setChecked()方法而不是单选按钮上的setSelected()方法。

此外，您需要默认selectedType = yes2.getText().toString();，因为您将其设置为onCreate()中的默认选择。

yes2.setChecked(true);
selectedType = yes2.getText().toString();

EDIT显示如何使用无默认选择：

Next.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        if(yes2.isChecked() || no2.isChecked()) {
            Intent intent = new Intent(dengueQues2.this, dengueQues3.class);
            intent.putExtra("REST2", selectedType);
            startActivity(intent);
        } else {
            Toast.makeText(this, "Please choose 1 answer", 
                          Toast.LENGTH_SHORT).show();
        }
    }
});

如何在android中验证单选按钮？

1 个答案: