Android Program : Create an Android Application that Demonstrate Radio Button
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=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Select "
android:textStyle="bold"
android:layout_marginLeft="10dp"
android:textSize="20dp"/>
<!-- add RadioGroup which contain the many RadioButton-->
<RadioGroup
android:layout_marginTop="50dp"
android:id="@+id/groupradio"
android:layout_marginLeft="10dp"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<!-- In RadioGroup create the 1 Radio Button-->
<!-- like this we will add some more Radio Button-->
<RadioButton
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/radia_id1"
android:text="Male"
android:textSize="20dp"/>
<RadioButton
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/radia_id2"
android:text="Female"
android:textSize="20dp"/>
<RadioButton
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/radia_id3"
android:text="Yes"
android:textSize="20dp"/>
<RadioButton
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/radia_id4"
android:text="No"
android:textSize="20dp"/>
</RadioGroup>
<!-- add button For Submit the Selected item-->
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Submit"
android:id="@+id/submit"
android:textStyle="bold"
android:textSize="20dp"
android:layout_marginTop="200dp"
android:layout_marginLeft="180dp"
/>
<!-- add clear button for clear the selected item-->
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Clear"
android:id="@+id/clear"
android:textSize="20dp"
android:textStyle="bold"
android:layout_marginTop="200dp"
android:layout_marginLeft="20dp"
/>
</RelativeLayout>
MainActivity.java
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.Toast;
public class MainActivity extends AppCompatActivity {
// Define the object for Radio Group,
// Submit and Clear buttons
private RadioGroup radioGroup;
Button submit, clear;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Bind the components to their respective objects
// by assigning their IDs
// with the help of findViewById() method
submit = (Button)findViewById(R.id.submit);
clear = (Button)findViewById(R.id.clear);
radioGroup = (RadioGroup)findViewById(R.id.groupradio);
// Uncheck or reset the radio buttons initially
radioGroup.clearCheck();
// Add the Listener to the RadioGroup
radioGroup.setOnCheckedChangeListener(
new RadioGroup
.OnCheckedChangeListener() {
@Override
// The flow will come here when
// any of the radio buttons in the radioGroup
// has been clicked
// Check which radio button has been clicked
public void onCheckedChanged(RadioGroup group,
int checkedId)
{
// Get the selected Radio Button
RadioButton
radioButton
= (RadioButton)group
.findViewById(checkedId);
}
});
// Add the Listener to the Submit Button
submit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
// When submit button is clicked,
// Ge the Radio Button which is set
// If no Radio Button is set, -1 will be returned
int selectedId = radioGroup.getCheckedRadioButtonId();
if (selectedId == -1) {
Toast.makeText(MainActivity.this,
"No answer has been selected",
Toast.LENGTH_SHORT)
.show();
}
else {
RadioButton radioButton
= (RadioButton)radioGroup
.findViewById(selectedId);
// Now display the value of selected item
// by the Toast message
Toast.makeText(MainActivity.this,
radioButton.getText(),
Toast.LENGTH_SHORT)
.show();
}
}
});
// Add the Listener to the Submit Button
clear.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
// Clear RadioGroup
// i.e. reset all the Radio Buttons
radioGroup.clearCheck();
}
});
}
}
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