How to get selected item from a RadioGroup in Android

activity_main.xml 
 <RelativeLayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/rl"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:padding="10dp"     tools:context=".MainActivity"     android:background="#fff6e4"     >     <TextView         android:id="@+id/tv_result"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:textColor="@android:color/holo_red_dark"         android:paddingBottom="15dp"         />     <TextView         android:id="@+id/tv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Which is your most favorite?"         android:layout_below="@+id/tv_result"         />     <RadioGroup         android:id="@+id/rg"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:orientation="vertical"         android:layout_below="@id/tv"         android:padding="15dp"         >         <RadioButton             android:id="@+id/rb_coldfusion"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:text="ColdFusion"             android:paddingRight="15dp"             />         <RadioButton             android:id="@+id/rb_flex"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:text="Flex"             android:paddingRight="15dp"             />     </RadioGroup>     <Button         android:id="@+id/btn"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Get Selected Radio Button"         android:layout_below="@+id/rg"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.os.Bundle; import android.app.Activity; import android.view.View; import android.widget.Button; import android.widget.RadioButton; import android.widget.RadioGroup; import android.widget.TextView;  public class MainActivity extends Activity {      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          Button btn = (Button) findViewById(R.id.btn);         tamat TextView tv_result = (TextView) findViewById(R.id.tv_result);          tamat RadioGroup rg = (RadioGroup) findViewById(R.id.rg);          btn.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 // Get the checked Radio Button ID from Radio Grou[                 int selectedRadioButtonID = rg.getCheckedRadioButtonId();                  // If nothing is selected from Radio Group, then it return -1                 if (selectedRadioButtonID != -1) {                      RadioButton selectedRadioButton = (RadioButton) findViewById(selectedRadioButtonID);                     String selectedRadioButtonText = selectedRadioButton.getText().toString();                      tv_result.setText(selectedRadioButtonText + " selected.");                 }                 else{                     tv_result.setText("Nothing selected from Radio Group.");                 }             }         });    } }
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