MpChart MarkerView, . MarkerView .
, ChartMarker MarkerView. , src .
public ChartMarker(Context context) {
super(context, R.layout.layout_dot);
}
, ChartMarker chart.setMarkerView()
ChartMarker elevationMarker = new ChartMarker(getActivity());
elevationChart.setMarkerView(elevationMarker);
layout_dot.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView
android:background="@drawable/dot"
android:layout_width="5dp"
android:layout_height="5dp" />
</LinearLayout>