GraphView - graphviewseries null

Question

即使我的 graphhviewdata 中有值，我的 grapviewseries 似乎总是为空

这是我的代码：

GraphViewData []graphViewData = new GraphViewData[1000] ;
        for (int i = 0; i < listprice.size(); i++) {
            Log.e("date", String.valueOf(listdate.get(i)));
            Log.e("price",String.valueOf( listprice.get(i)));
            graphViewData[i] = new GraphViewData(listdate.get(i), listprice.get(i));

        }

        GraphViewSeries exampleSeries = new GraphViewSeries( graphViewData);


        GraphView graphView = new LineGraphView(getActivity() // context
                , "" // heading
        );
        ((LineGraphView) graphView).setDrawDataPoints(true);
        ((LineGraphView) graphView).setDataPointsRadius(15f);
        graphView.addSeries(exampleSeries); // data

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

这些是给我的错误：

11-14 00:02:10.559: E/AndroidRuntime(14809): java.lang.NullPointerException
11-14 00:02:10.559: E/AndroidRuntime(14809): at com.jjoe64.graphview.GraphViewSeries.checkValueOrder(GraphViewSeries.java:199)
11-14 00:02:10.559: E/AndroidRuntime(14809):    at com.jjoe64.graphview.GraphViewSeries.<init>(GraphViewSeries.java:91)

Answer 1

您正在创建一个包含 1000 个元素的数组

GraphViewData []graphViewData = new GraphViewData[1000] ;

但您只是为第一个 listprice.size() 元素设置值。其余为空。

要么让你的数组只有listprice.size() 元素，要么将当前的空值设置为一些适当的非空值，例如GraphViewData(0.0,0.0)。