you can use ImageView as Button. Create an ImageView and set clickable true after in write imageView.setOnClickListener for ImageView.
<ImageView
android:clickable="true"
android:focusable="true"`
android:id="@+id/imageview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
and in Activity's oncreate:
imageView.setOnClickListener(...