How to add mpandroidchart touch point value display with line color

Question

How to add the display of the value of the point of touch of the line mpandroidchart Marker with a colored background

My expectation

my coding

CustomMarkerView mv = new CustomMarkerView (MainActivity.this, R.layout.tv_content);
chart.setMarkerView(mv);

CustomMarkerView.java

public class CustomMarkerView extends MarkerView {

private TextView tvContent;
public CustomMarkerView (Context context, int layoutResource) {
    super(context, layoutResource);
    // this markerview only displays a textview
    tvContent = (TextView) findViewById(R.id.tvContent);
}

@Override
public void refreshContent(Entry e, Highlight highlight) {
    tvContent.setText("" + e.getVal());
}

@Override
public int getXOffset(float xpos) {
    return -(getWidth() / 2);
}

@Override
public int getYOffset(float ypos) {
    return -getHeight();
}

}