Question

我在android上有一个graphView的问题，当我尝试在x轴上显示我的图表时，我得到了这个结果： graph

每次生成图表时x值都会发生变化，有时会显示图表中的条形图，有时候不是真正随机的。

这是我的代码：

            Cursor weeklySale = db.getWeeklySale(login);

            DataPoint[] dp= new DataPoint[weeklySale.getCount()];
            Date[] dates= new Date[weeklySale.getCount()];

            int i=0;
            while(weeklySale.moveToNext())
            {
                SimpleDateFormat sdf = new SimpleDateFormat("dd MM yyyy");
                Calendar cal = Calendar.getInstance();
                cal.set(Calendar.WEEK_OF_YEAR, Integer.valueOf(weeklySale.getString(1)));
                cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);

                // Date c = new Date(weeklySale.getLong(1));
                dp[i]= new DataPoint(cal.getTime(), (long)weeklySale.getFloat(0));
                dates[i]= cal.getTime();

                System.out.println(weeklySale.getFloat(0)+" + "+weeklySale.getString(1)+" , "+sdf.format(cal.getTime()));
            }

            graph.removeAllSeries();

            GridLabelRenderer gridLabel = graph.getGridLabelRenderer();
            gridLabel.setHorizontalAxisTitle("Semaine");
            gridLabel.setVerticalAxisTitle("CA");

            LineGraphSeries series = new LineGraphSeries<DataPoint>(dp);
            series.setColor(Color.RED);
            graph.addSeries(series);

由于

Answer 1

尝试通过以下方式更改标签数量：

graph.getGridLabelRenderer().setNumHorizontalLabels()

此外，您应该将此行移出while循环以节省内存和性能： SimpleDateFormat sdf = new SimpleDateFormat("dd MM yyyy");

Android图表视图日期轴无法正常显示

1 个答案: