Question

I am currently trying to draw a graph within an Android application. The library I found is called GraphView (http://www.jjoe64.com/p/graphview-library.html). I am currently using version 2, which is available on GitHub.

Drawing graphs works really nicely. The code necessary to get a graph is the following:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    Map<String,List<GraphEntry>> graphData = (...)

    if (graphData != null) {
        List<GraphEntry> entries = graphData.get("temperature");
        GraphView.GraphViewData[] data = new GraphView.GraphViewData[entries.size()];

        int i = 0;
        for (GraphEntry entry : entries) {
            data[i++] = new GraphView.GraphViewData(entry.getDate().getTime(), entry.getValue());
        }
        GraphView.GraphViewSeries graphViewSeries = new GraphView.GraphViewSeries("temperature", 0xffff0000, data);
        LineGraphView graphView = new LineGraphView(this, "temperature");
        graphView.addSeries(graphViewSeries);
        graphView.setShowLegend(true);

        LinearLayout graphLayout = (LinearLayout) findViewById(R.id.layout);
        graphLayout.addView(graphView);
    }
}

This will produce a normal graph. Unfortunately, all kinds of labels are missing. The documentation tells that for the normal use case, one does not have to care about labels, as the library does this automatically. What am I doing wrong? I only get the plain graph, without any labels.

For the completeness, I am adding the graph to a linear layout. The appropriate layout file has the following contents:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:layout_width="match_parent"
          android:layout_height="fill_parent"
          android:padding="5dp"
          android:id="@+id/layout"
          android:orientation="vertical"
    ></LinearLayout>

The GraphEntry class is only a container with a java.util.Date attribute and a double value attribute.

Thank you very much for any help,

Matthias

Answer 1

I switched to another charting engine: AChartEngine. This one works out of the box.