To plot a points diagram with GraphView you have to use the PointsGraphSeries class. This has some predefined drawings, and you have to opportunity to use a custom rendering.
Options:
Here is an example with the different shapes and a custom shape:
GraphView graph = (GraphView) findViewById(R.id.graph);
PointsGraphSeries<DataPoint> series = new PointsGraphSeries<>(new DataPoint[] {
new DataPoint(0, -2),
new DataPoint(1, 5),
new DataPoint(2, 3),
new DataPoint(3, 2),
new DataPoint(4, 6)
});
graph.addSeries(series);
series.setShape(PointsGraphSeries.Shape.POINT);
PointsGraphSeries<DataPoint> series2 = new PointsGraphSeries<DataPoint>(new DataPoint[] {
new DataPoint(0, -1),
new DataPoint(1, 4),
new DataPoint(2, 2),
new DataPoint(3, 1),
new DataPoint(4, 5)
});
graph.addSeries(series2);
series2.setShape(PointsGraphSeries.Shape.RECTANGLE);
series2.setColor(Color.RED);
PointsGraphSeries<DataPoint> series3 = new PointsGraphSeries<>(new DataPoint[] {
new DataPoint(0, 0),
new DataPoint(1, 3),
new DataPoint(2, 1),
new DataPoint(3, 0),
new DataPoint(4, 4)
});
graph.addSeries(series3);
series3.setShape(PointsGraphSeries.Shape.TRIANGLE);
series3.setColor(Color.YELLOW);
PointsGraphSeries<DataPoint> series4 = new PointsGraphSeries<>(new DataPoint[] {
new DataPoint(0, 1),
new DataPoint(1, 2),
new DataPoint(2, 0),
new DataPoint(3, -1),
new DataPoint(4, 3)
});
graph.addSeries(series4);
series4.setColor(Color.GREEN);
series4.setCustomShape(new PointsGraphSeries.CustomShape() {
@Override
public void draw(Canvas canvas, Paint paint, float x, float y, DataPointInterface dataPoint) {
paint.setStrokeWidth(10);
canvas.drawLine(x-20, y-20, x+20, y+20, paint);
canvas.drawLine(x+20, y-20, x-20, y+20, paint);
}
});