Checkboxes allow the user to select one or more options from a set. Typically, you should present each checkbox option in a vertical list.
Now we will create an app which displays a question in a TextView and four answer options in four different Checkboxes. When user selects one of the options and clicks a button, the app tells if the answer is correct or not.
Step 1: Create a new project with name checkboxquiz and package name com.myexample.checkbox. Select File -> New -> New Project. Fill the forms and click “Finish” button.
Step 2: Open res -> layout -> xml (or) main.xml and add the code given below. Here we will create a TextView to display question, 4 CheckBoxes to display options, a Button, and another TextView to display result, in a LinearLayout.
<LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <LinearLayout android:id="@+id/linear1" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="8dp" android:background="#FFFFFF" android:orientation="vertical"> <TextView android:id="@+id/textview1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="8dp" android:text="Which is the nearest star to planet Earth\?" android:textSize="25sp" android:textColor="#E91E63"/> <CheckBox android:id="@+id/checkbox1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="8dp" android:text="Moon" android:textSize="18sp" android:textColor="#3F51B5"/> <CheckBox android:id="@+id/checkbox2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="8dp" android:text="Mars" android:textSize="18sp" android:textColor="#3F51B5"/> <CheckBox android:id="@+id/checkbox3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="8dp" android:text="Sun" android:textSize="18sp" android:textColor="#3F51B5"/> <CheckBox android:id="@+id/checkbox4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="8dp" android:text="Venus" android:textSize="18sp" android:textColor="#3F51B5"/> <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="8dp" android:background="#03A9F4" android:text="Submit" android:textSize="20sp" android:textColor="#FFFFFF"/> <TextView android:id="@+id/textview2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="8dp" android:textSize="18sp" android:textColor="#000000"/> </LinearLayout></LinearLayout> |
Step 3: Open app -> java -> package and open MainActivity.java. Add following code in it. Here when a CheckBox is clicked, we will uncheck other 3 CheckBoxes, and when Button is clicked, we display if the CheckBox with correct answer is checked.
package com.myexample.checkbox;import android.os.*;import android.app.Activity;import android.widget.LinearLayout;import android.widget.TextView;import android.widget.CheckBox;import android.widget.Button;import android.view.View;public class MainActivity extends Activity { private TextView textview1; private CheckBox checkbox1; private CheckBox checkbox2; private CheckBox checkbox3; private CheckBox checkbox4; private Button button1; private TextView textview2; @Override protected void onCreate(Bundle _savedInstanceState) { super.onCreate(_savedInstanceState); setContentView(R.layout.main); // find the widgets from their ids on main.xml page textview1 = (TextView) findViewById(R.id.textview1); checkbox1 = (CheckBox) findViewById(R.id.checkbox1); checkbox2 = (CheckBox) findViewById(R.id.checkbox2); checkbox3 = (CheckBox) findViewById(R.id.checkbox3); checkbox4 = (CheckBox) findViewById(R.id.checkbox4); button1 = (Button) findViewById(R.id.button1); textview2 = (TextView) findViewById(R.id.textview2); checkbox1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { // When checkbox1 is clicked // uncheck checkbox2, checkbox3, and checkbox4 checkbox2.setChecked(false); checkbox3.setChecked(false); checkbox4.setChecked(false); } }); checkbox2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { // When checkbox2 is clicked // uncheck checkbox1, checkbox3, and checkbox4 checkbox1.setChecked(false); checkbox3.setChecked(false); checkbox4.setChecked(false); } }); checkbox3.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { // When checkbox3 is clicked // uncheck checkbox1, checkbox2, and checkbox4 checkbox2.setChecked(false); checkbox1.setChecked(false); checkbox4.setChecked(false); } }); checkbox4.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { // When checkbox4 is clicked // uncheck checkbox1, checkbox2, and checkbox3 checkbox2.setChecked(false); checkbox3.setChecked(false); checkbox1.setChecked(false); } }); button1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { // When button is clicked // show if the checked checkbox represent correct answer if (checkbox3.isChecked()) { textview2.setText("Correct! Sun is the correct answer."); } else { textview2.setText("Sorry! Your answer is incorrect."); } } }); } } |
Output:
Now run the app. You will see the app displays a question and four options in four different Checkboxes. When you select one of the options and click the button, the app displays whether you selected the correct answer.