For example: If you have made two radio buttons for Gender, without RadioGroup then the user can select both genders as there is no RadioGroup.
The solution is, will use RadioGroup if a user selects one option it will uncheck other options.
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In the MainActivity.java we are going to check through setOnCheckedChangeListener which Radio button is checked.
Whichever the RadioButton is checked in a group the toast message will pop up.
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.RadioGroup;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
RadioGroup radioGroup;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
radioGroup = findViewById(R.id.radioGroup);
radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
switch (checkedId) {
case R.id.radioButton:
Toast.makeText(getApplicationContext(), "First Radio Is Selected",
Toast.LENGTH_LONG).show();
break;
case R.id.radioButton2:
Toast.makeText(getApplicationContext(), "Second Radio Is Selected",
Toast.LENGTH_LONG).show();
break;
}
}
});
}
}
In the main_activity.xml we will put the radio group first then we will put the radio button.
