Question

我想在Android应用中进行测验。

我做了一个RadioGroup来显示每个问题的答案。我希望在代表答案的RadioButton未被点击时显示，但它不能正常工作。

关注我的代码：

public class MainActivity extends ActionBarActivity {

    private RadioGroup radioGroup;
    int ans;
    private Button btnSubmitQuiz;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_main);

        RadioGroup champ=(RadioGroup)findViewById(R.id.answer1);
        champ.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            public void onCheckedChanged(RadioGroup group, int checkedId) {
                switch(checkedId) {
                    case R.id.answer1A:
                    ans1 =0;
                    break;
                    case R.id.answer1B:
                    ans1 =1;
                    break;
                    default:
                    Toast.makeText(MainActivity.this, "error", Toast.LENGTH_SHORT).show();
                    break; 
                }
            }

        });
}

文件.xml是这样的：

<RadioGroup
    android:id="@+id/answer1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="0.4">

    <RadioButton
        android:id="@+id/answer1A"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <RadioButton
        android:id="@+id/answer1B"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</RadioGroup>

有人可以帮助我吗？

Answer 1

将您的Toast消息移至包含错误答案的“case block”

public void onCheckedChanged(RadioGroup group, int checkedId) {
            switch(checkedId) {
                case R.id.answer1A:
                ans1 =0;
                break;
                case R.id.answer1B:
                ans1 =1;
                Toast.makeText(MainActivity.this, "error", Toast.LENGTH_SHORT).show();
                break;

            }
        }

    });}

假设R.id.answr1B持错了答案

如何显示未点击的radiogroup

1 个答案: