I use Steema TeeChart JAVA for Android to create a Chart. With the following code i tried to change the color of the charts border, but it effects nothing.
public void setBorderColor(Color borderColor){
    tChart.getWalls().getRight().setColor(borderColor);
    tChart.getWalls().getLeft().setColor(borderColor);
    tChart.getWalls().getBottom().setColor(borderColor);
    tChart.getWalls().getBack().setColor(borderColor);
}
				
                        
Try changing the pen color
getPen()instead of changing the wall color. Ie:You may be interested on also changing the axes pen color. Ie: