CODEWITHSUNDEEP
androidgraphandroid-graphview
Tech
Tech

Reputation: 155

Unable to generate datapoint series for android graph view line graph

I am trying to add multiple data series to an android graph view linegraph - I am using the example from the real-time example as follows:

private DataPoint[] generateData() {
        int count = 30;
        DataPoint[] values = new DataPoint[count];
        for (int i=0; i<count; i++) {
            double x = i;
            double y = Math.sin(i*0.45+2) + 0.3;
            DataPoint v = new DataPoint(x, y);
            values[i] = v;
        }
        return values;
    }

and I am adding with the following:

series1 = new LineGraphSeries<DataPoint>(generateData());
            graph.addSeries(series1);

however when I run this I get an NPE. Does anyone know what I am missing or doing wrong. I have removed the actual data from the generateData method to ensure that was not the problem. Any help will be much appreciated. Jack

Upvotes: 1

Views: 2464

Answers (2)

Gilad Brunfman
Gilad Brunfman

Reputation: 3502

     values = new DataPoint[10];
        for (int i=0; i<10; i++) {
            Integer xi = i;
            Integer yi = i+1;
            DataPoint v = new DataPoint(xi, yi);
            values[i] = v;
        }
     series = new LineGraphSeries<DataPoint>(values);

     graphView.addSeries(series);

Upvotes: 1

leangaurav
leangaurav

Reputation: 443

Have you added something like
<com.jjoe64.graphview.GraphView android:layout_width="match_parent" android:layout_height="200dip" android:id="@+id/graph" />
to the activity's layout.If not, than add it to the activity's layout This is where the graph is plotted.You can also change the width,height and other attributes from xml.

Upvotes: 0

Related Questions