Full source code in Android to use RadioButtons and RadioGroups. We will react to clicks and display our selection in a Toast message and in a TextView. Radio Groups will make sure, that we can select only one Radio Button at a time. RadioButtons are helpful to implement multiple choice features into your app
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="tech.codinginpoint.radiobuttonexample.MainActivity">
<RadioGroup
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:id="@+id/radioGroup">
<RadioButton
android:id="@+id/radio_one"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="One"
android:onClick="checkButton"
android:checked="true"/>
<RadioButton
android:id="@+id/radio_two"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Two"
android:onClick="checkButton"/>
<RadioButton
android:id="@+id/radio_three"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Three"
android:onClick="checkButton"/>
</RadioGroup>
<TextView
android:id="@+id/text_view_selected"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/radioGroup"
android:layout_centerHorizontal="true"
android:layout_marginTop="27dp"
android:text="Your selection: "
android:textSize="20sp" />
<Button
android:id="@+id/button_apply"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/text_view_selected"
android:layout_centerHorizontal="true"
android:layout_marginTop="37dp"
android:text="apply" />
</RelativeLayout>
MainActivity.java
package tech.codinginpoint.radiobuttonexample;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
RadioGroup radioGroup;
RadioButton radioButton;
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
radioGroup = findViewById(R.id.radioGroup);
textView = findViewById(R.id.text_view_selected);
Button buttonApply = findViewById(R.id.button_apply);
buttonApply.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int radioId = radioGroup.getCheckedRadioButtonId();
radioButton = findViewById(radioId);
textView.setText("Your choice: " + radioButton.getText());
}
});
}
public void checkButton(View v) {
int radioId = radioGroup.getCheckedRadioButtonId();
radioButton = findViewById(radioId);
Toast.makeText(this, "Selected Radio Button: " + radioButton.getText(),
Toast.LENGTH_SHORT).show();
}
}