<selector xmlns:android="http://schemas.android.com/apk/res/android" >
  <item android:state_pressed="true">
    <shape android:shape="rectangle">
      <corners android:radius="5dp" />
      <solid android:color="#50000000"/>
    </shape>
  </item>

  <item >
    <shape android:shape="rectangle">
      <corners android:radius="5dp" />
      <solid android:color="#00000000"/>
    </shape>
  </item>

</selector>

<ImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:contentDescription="@null"
    android:scaleType="centerCrop"
    android:src="@drawable/share_image_selector" />

mImageView.setBackgroundResource(R.drawable.icon);