RadioButton : RadioButon is a two state button that can be checked or unchecked. If a radio button is unchecked then a user can check it by simply clicking on it. Once a RadioButton is checked by a user it can’t be unchecked by simply pressing the same button. It will automatically unchecked when you press any other RadioButton within same RadioGroup.
Step 1: Open up Android Studio Project through res -> layout -> activity_main.xml (or) main.xml and add below code or just drag and drop the switch to design XML file.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity"> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:background="#e0e0e0" android:orientation="vertical"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Select your favourite wwe Fruit :: " android:textColor="#000" android:textSize="20sp" android:textStyle="bold" /> <RadioGroup android:layout_width="wrap_content" android:layout_height="wrap_content"> <RadioButton android:id="@+id/apple" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="20dp" android:layout_marginTop="10dp" android:checked="true" android:text="@string/apple" android:textColor="#154" android:textSize="20sp" android:textStyle="bold" /> <RadioButton android:id="@+id/mango" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="20dp" android:layout_marginTop="10dp" android:checked="false" android:text="@string/mango" android:textColor="#154" android:textSize="20sp" android:textStyle="bold" /> </RadioGroup> <Button android:id="@+id/submitButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_margin="20dp" android:background="#0f0" android:padding="10dp" android:text="Submit" android:textColor="#fff" android:textSize="20sp" android:textStyle="bold" /> </LinearLayout> </LinearLayout>
Step 2:Add below code in MainActivity.java to handle events on switch.
package com.bytelogs.example; 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.Toast; public class MainActivity extends AppCompatActivity { RadioButton apple,mango; String fruit; Button submit; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); apple = (RadioButton) findViewById(R.id.apple); mango = (RadioButton) findViewById(R.id.randyOrton); submit = (Button) findViewById(R.id.submitButton); submit.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (apple.isChecked()) { fruit = apple.getText().toString(); } else(mango.isChecked()) { fruit = apple.getText().toString(); } Toast.makeText(getApplicationContext(), fruit, Toast.LENGTH_LONG).show(); // print the value of selected super star } }); } }
Step 3: Open res -> values -> strings.xml.
<resources> <string name="app_name">RadioButtonExample</string> <string name="hello_world">Hello world!</string> <string name="action_settings">Settings</string> <string name="apple">Apple</string> <string name="mango">Mango</string> </resources>
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