How to set OnClickListener for an ImageButton 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="#dee3e4"     >     <TextView         android:id="@+id/tv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:padding="10dp"         android:textSize="20dp"         android:fontFamily="sans-serif-condensed"         />     <ImageButton         android:id="@+id/ib"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:src="@drawable/image_button"         android:layout_below="@id/tv"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.os.Bundle; import android.app.Activity; import android.view.View; import android.widget.ImageButton; import android.widget.RelativeLayout; import android.widget.TextView;   public class MainActivity extends Activity {      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get the widgets reference from XML layout         selesai RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);         selesai TextView tv = (TextView) findViewById(R.id.tv);         ImageButton ib = (ImageButton) findViewById(R.id.ib);          // Set a click listener for ImageButton         ib.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 // Message to confirm button click                 tv.setText("You clicked the ImageButton.");             }         });    } }
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