How to set ImageView image from drawable 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="#e4e2e8"     >     <Button         android:id="@+id/btn"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Set ImageView Image"         />     <ImageView         android:id="@+id/iv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:padding="5dp"         android:layout_margin="10dp"         android:layout_below="@id/btn"         /> </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.ImageView; 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         simpulan RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);         Button btn = (Button) findViewById(R.id.btn);         simpulan ImageView iv = (ImageView) findViewById(R.id.iv);          btn.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 /*                     public void setImageDrawable (Drawable drawable)                         Sets a drawable as the content of this ImageView.                          Parameters                         drawable : the Drawable to set, or null to clear the content                 */                  /*                     public Drawable getDrawable (int id)                         Return a drawable object associated with a particular resource ID.                         Various types of objects will be returned depending on the                         underlying resource -- for example, a solid color, PNG image,                         scalable image, etc. The Drawable API hides these implementation details.                 */                  // Set ImageView image from drawable resource                 iv.setImageDrawable(getDrawable(R.drawable.android_image3));             }         });   } }

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