regarding display of circle in center of screen

[engr-erum]

i m trying to <com.example.waterwave.WaterWaveProgress
android:id="@+id/waterWaveProgress1"
android:layout_width="wrap_content"
android:layout_height="140dp"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:layout_centerHorizontal="true"
app:maxProgress="100"
app:progress="15"
/>

and also center_in_parent= "true" to the waveview but still no luck its not displaying in center of screen can u pls discuss how to resolve this ?