How to set an image to ImageView 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="#d8dcda"     >     <!--         android:src             Sets a drawable as the content of this ImageView.              May be a reference to another resource, in the form "@[+][package:]type:name"             or to a theme attribute in the form "?[package:][type:]name".              May be a color value, in the form of "#rgb", "#argb", "#rrggbb", or "#aarrggbb".              This corresponds to the global attribute resource symbol src.     -->     <!-- Set ImageView image by XML-->     <ImageView         android:id="@+id/iv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:src="@drawable/android_image"         android:padding="3dp"         />     <!-- Set ImageView image programmatically-->     <ImageView         android:id="@+id/iv2"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_toRightOf="@id/iv"         android:padding="3dp"         />     <!-- Set ImageView image as drawable programmatically-->     <ImageView         android:id="@+id/iv3"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_toRightOf="@id/iv2"         android:padding="3dp"         />     <!-- Set ImageView image as bitmap programmatically-->     <ImageView         android:id="@+id/iv4"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_toRightOf="@id/iv3"         android:padding="3dp"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.os.Bundle; import android.app.Activity; import android.widget.ImageView; import android.widget.RelativeLayout; import android.graphics.Bitmap; import android.graphics.BitmapFactory;   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);         ImageView iv = (ImageView) findViewById(R.id.iv);         ImageView iv2 = (ImageView) findViewById(R.id.iv2);         ImageView iv3 = (ImageView) findViewById(R.id.iv3);         ImageView iv4 = (ImageView) findViewById(R.id.iv4);          /*             setImageResource (int resId)                 Sets a drawable as the content of this ImageView.                  Parameters                     resId : the resource identifier of the drawable                  This does Bitmap reading and decoding on the UI thread, which can cause                 a latency hiccup. If that's a concern, consider using                 setImageDrawable(android.graphics.drawable.Drawable) or                 setImageBitmap(android.graphics.Bitmap) and BitmapFactory instead.          */         // Set an image for second ImageView         iv2.setImageResource(R.drawable.android_image2);          // Set image as drawable for third ImageView         iv3.setImageDrawable(getDrawable(R.drawable.android_image3));          /*              Bitmap decodeResource (Resources res, int id)                 Synonym for decodeResource(Resources, int, android.graphics.BitmapFactory.Options) with null Options.                  Parameters                     res : The resources object containing the image data                     id : The resource id of the image data                  Returns                     The decoded bitmap, or null if the image could not be decoded.          */         Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.android_image4);          // Set image as bitmap for fourth ImageView         iv4.setImageBitmap(bitmap);    } }
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