Set ImageView adjustViewBounds to true

<?xml version="1.0" encoding="utf-8"?>
<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/icon"
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"
    android:adjustViewBounds="true"
    android:src="@drawable/myImageFileName"
    />//w  w  w .  j av  a2s  .com

import android.app.Activity;
import android.os.Bundle;
/*from   w w w. j  a v  a2  s.c o  m*/
public class ImageViewDemo extends Activity {
  @Override
  public void onCreate(Bundle icicle) {
      super.onCreate(icicle);
      setContentView(R.layout.main);
  }
}