比较并查看用户是否单击了android测验答案的正确单选按钮

Question

大家好，我需要做一个简单的android测验。好吧，我这样做是借助在线其他示例进行的。

MyOSIActivity.java

package com.mns.mp;


import tp.mns.mp.R;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

public class MyOSIActivity extends Activity {

    private RadioGroup radioAnswerGroup;
    private RadioButton radioAnswerButton;
    private Button btnSubmit;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        addListenerOnButton();

    }

    public void addListenerOnButton() {

        radioAnswerGroup = (RadioGroup) findViewById(R.id.radioAnswer);
        btnSubmit = (Button) findViewById(R.id.btnSubmit);

        btnSubmit.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {

                // get selected radio button from radioGroup
                int selectedId = radioAnswerGroup.getCheckedRadioButtonId();

                // find the radiobutton by returned id
                radioAnswerButton = (RadioButton) findViewById(selectedId);

                Toast.makeText(MyOSIActivity.this,
                        radioAnswerButton.getText(), Toast.LENGTH_SHORT).show();

            }

        });

    }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

        <TextView
        android:id="@+id/Qn1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
         android:text="@string/Qn_1"
       />

    <RadioGroup
        android:id="@+id/radioAnswer"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >

        <RadioButton
            android:id="@+id/radio1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/radio_1" 
            android:checked="true" />

        <RadioButton
            android:id="@+id/radio2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/radio_2" />

         <RadioButton
            android:id="@+id/radio3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/radio_3" />

    </RadioGroup>

    <Button
        android:id="@+id/btnSubmit"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/btn_submit" />

</LinearLayout>

strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="hello">Hello World, MyAndroidAppActivity!</string>
    <string name="app_name">MyAndroidApp</string>
    <string name="Qn_1"> Question 1: Acknowledgement, Sequencing, and Flow control are characteristics of which OSI layer?</string>
    <string name="radio_1">Layer 2</string>
    <string name="radio_2"> Layer 3</string>
    <string name="radio_3"> Layer 4</string>
    <string name="btn_submit">Submit</string>

</resources>

好吧，我正在尝试让系统将用户答案与正确答案进行比较，方法是按用户提交按钮（在本例中为第4层）。然后，如果用户答案错误，吐司将向用户回复是不正确的，并显示正确的答案。如果用户是正确的，它将向用户回复正确。所以我需要使用其他方法，但问题是我仍然不熟悉它。如果你们给我指导，我会非常感激，因为我确实需要它。非常感谢：D

Answer 1

您可以通过多种方式执行此操作。...如果您知道正确答案的ID，则可以执行以下操作：

if (selectedId==correctId){
    //show toast saying it is correct
}
else{
    //toast incorrect
}

Answer 2

在kotlin中，您可以使用..

radioAnswerGroup.setOnCheckedChangeListener(RadioGroup.OnCheckedChangeListener { group, checkedId ->

val isChecked = radioAnswerButton.isChecked

  if (isChecked) {
      Log.e("is check","right answer--")
  }else{
      Log.e("is check","wrong answer")
  }

})