我遇到了这个问题,我从 sqlite 数据库中获取日期值并尝试在 X 轴上针对其他一些值绘制它们。但即使在 SO 上尝试了不同的解决方案后,我也无法解决这个问题。我得到的不是我的值,而是随机日期(1970 年 1 月 30 日),并且到处都是相同的日期。
请帮我解决一下这个。
这是获取日期的代码:
public Date[] getReportDates(ReportGraph reportGraph)
{
// TODO Auto-generated method stub
String [] columns = new String[]{KEY_ROW_ID, KEY_KM, KEY_FUEL_QTY, KEY_FUEL_PRICE, KEY_TOTAL_COST, KEY_MILEAGE, KEY_DATE,KEY_TANK_FULL};
String selectQuery = "SELECT _date FROM fuel_table";
reportCursor = ourDatabase.rawQuery(selectQuery, null);
int i = 0;
int count = reportCursor.getCount();
Date[] reportList = new Date[count];
if(reportCursor.moveToFirst())
{
do
{
reportList[i] = new Date(reportCursor.getLong(0));
i++;
} while(reportCursor.moveToNext());
}
reportCursor.close();
return reportList;
FOr graph plotting
double[] fPrice;
double[] fMileage;
Date[] fDates;
XYMultipleSeriesRenderer rRenderer;
XYMultipleSeriesDataset dataset;
XYSeriesRenderer priceRenderer, mileageRenderer,dateRenderer;
public Intent getIntent(Context context)
{
FuelStoredInfo reportInfo =new FuelStoredInfo(context);
reportInfo.open();
fPrice=reportInfo.getReportData(this);
fMileage = reportInfo.getReportMileage(this);
fDates = reportInfo.getReportDates(this);
reportInfo.close();
TimeSeries fPriceseries = new TimeSeries("Fuel prices");
for(int i=0;i<fDates.length;i++)
{
fPriceseries.add(fDates[i], fPrice[i]);
}
TimeSeries fMileageSeries = new TimeSeries("Mileage");
for(int i=0;i<fDates.length;i++)
{
fMileageSeries.add(fDates[i],fMileage[i]);
}
dataset = new XYMultipleSeriesDataset();
dataset.addSeries(fPriceseries);
dataset.addSeries(fMileageSeries);
}