How to set an ImageButton background transparent 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="#f0d945"     >     <!-- No Transparency -->     <ImageButton         android:id="@+id/ib"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:src="@drawable/transparent_image_button"         />     <!-- Background Transparent by XML -->     <!--         You can also use             android:background="@android:color/transparent"             android:background="@null"      -->     <!--         It keep the button click effect.             android:background="?android:selectableItemBackground"     -->     <ImageButton         android:id="@+id/ib2"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:src="@drawable/transparent_image_button"         android:layout_toRightOf="@id/ib"         android:background="?android:selectableItemBackground"         />     <!-- Background Transparent Programmatically -->     <ImageButton         android:id="@+id/ib3"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:src="@drawable/transparent_image_button"         android:layout_toRightOf="@id/ib2"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.os.Bundle; import android.app.Activity; import android.util.TypedValue; import android.widget.ImageButton; import android.widget.RelativeLayout;   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);         ImageButton ib = (ImageButton) findViewById(R.id.ib);         ImageButton ib2 = (ImageButton) findViewById(R.id.ib2);         ImageButton ib3 = (ImageButton) findViewById(R.id.ib3);          // Set the third image button background transparent         // This method allow us to show click effect         TypedValue outValue = new TypedValue();         getApplicationContext().getTheme().resolveAttribute(                 android.R.attr.selectableItemBackground, outValue, true);         ib3.setBackgroundResource(outValue.resourceId);          // Another way (No button click effect)         //ib3.setBackgroundColor(Color.TRANSPARENT);    } }
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