我正在使用Achartengine来创建一条折线图。我的当前月份已经显示出来了，但是第二条折线，即上个月的数据没有显示出来。以下是lass和logcat的信息。如您从logcat中可以看到，我的日期是正确的，上个月的计数也是正确的。那么为什么它不显示出来呢，这就超出了我的理解范围。
日志记录：
日志记录：
08-07 16:13:43.969: I/PROJECTCARUSO(11734): DEBUG startdate: 2013-07-01 enddate: 2013-07-31
08-07 16:13:43.969: I/PROJECTCARUSO(11734): count: 9
08-07 16:13:43.979: I/PROJECTCARUSO(11734): DEBUG startdate: 2013-08-01 enddate: 2013-08-31
类：
public class TempHistoryFragment extends Fragment{
private GraphicalView mChartView;
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if (container == null) {
return null;
}
Calendar cal = Calendar.getInstance();
Calendar cal2 = Calendar.getInstance();
SimpleDateFormat month_date = new SimpleDateFormat("MMMMMMMMM");
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd",Locale.US);
String month_name = month_date.format(cal.getTime());
ArrayList<Integer> xArray = new ArrayList<Integer>();
ArrayList<Integer> yArray = new ArrayList<Integer>();
ArrayList<Integer> xArray2 = new ArrayList<Integer>();
ArrayList<Integer> yArray2 = new ArrayList<Integer>();
cal.add(Calendar.MONTH ,-1);
String prev_month_name = month_date.format(cal.getTime());
int daysInMonth = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
//***********************************************//
// Our first data Last MONTH
//***********************************************//
//start date for cursor
//cal.add(Calendar.MONTH, -1);
cal.set(Calendar.DATE, 1);
String startdate = df.format(cal.getTime());
//end date
cal.set(Calendar.DATE, daysInMonth);
String enddate = df.format(cal.getTime());
Log.i("PROJECTCARUSO","DEBUG startdate: " + startdate + " enddate: " + enddate);
Cursor c = getActivity().getContentResolver().query(StatusProvider.CONTENT_URI_CHARTING, null, "? < " + StatusData.KEY_CHARTING_DATE + " AND ? > " + StatusData.KEY_CHARTING_DATE , new String[] {startdate, enddate}, null); //
c.moveToFirst();
Log.i("PROJECTCARUSO","count: " + c.getCount());
if (c.getCount()>0 && c!=null) {
while (c.isAfterLast() == false) {
if ((isNumeric(c.getString(c.getColumnIndex(StatusData.KEY_CHARTING_TEMPERATURE))))) {
java.util.Date date = null;
int day = 0;
//get date from database
String datetest = c.getString(c.getColumnIndex(StatusData.KEY_CHARTING_DATE));
//try to reformat to date.
try {
date = format.parse(datetest);
day = date.getDate();
} catch (java.text.ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
xArray.add(day);
}
c.moveToNext();
}
}
int[] x = new int[xArray.size()];
for (int i = 0; i < xArray.size(); i++) {
x[i] = xArray.get(i);
}
int[] y = new int[yArray.size()];
for (int i = 0; i < yArray.size(); i++) {
y[i] = yArray.get(i);
}
TimeSeries series = new TimeSeries(prev_month_name);
for( int i = 0; i < y.length; i++)
{
series.add(x[i], y[i]);
}
//***********************************************//
// Our second data THIS MONTH
//***********************************************//
//start date for cursor
cal2.set(Calendar.DATE, 1);
String startdate2 = df.format(cal2.getTime());
//end date
cal2.set(Calendar.DATE, daysInMonth);
String enddate2 = df.format(cal2.getTime());
Log.i("PROJECTCARUSO","DEBUG startdate: " + startdate2 + " enddate: " + enddate2);
Cursor c2 = getActivity().getContentResolver().query(StatusProvider.CONTENT_URI_CHARTING, null, "? < " + StatusData.KEY_CHARTING_DATE + " AND ? > " + StatusData.KEY_CHARTING_DATE , new String[] {startdate2, enddate2}, null); //
c2.moveToFirst();
if (c2.getCount()>0 && c2!=null) {
while (c2.isAfterLast() == false) {
if (isNumeric(c2.getString(c2.getColumnIndex(StatusData.KEY_CHARTING_TEMPERATURE)))){
yArray2.add(c2.getInt(c2.getColumnIndex(StatusData.KEY_CHARTING_TEMPERATURE)));
java.util.Date date = null;
int day = 0;
//get date from database
String datetest = c2.getString(c2.getColumnIndex(StatusData.KEY_CHARTING_DATE));
//try to reformat to date.
try {
date = format.parse(datetest);
day = date.getDate();
} catch (java.text.ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
xArray2.add(day);
}
c2.moveToNext();
}
}
int[] x2 = new int[xArray2.size()];
for (int i = 0; i < xArray2.size(); i++) {
x2[i] = xArray2.get(i);
}
int[] y2 = new int[yArray2.size()];
for (int i = 0; i < yArray2.size(); i++) {
y2[i] = yArray2.get(i);
}
TimeSeries series2 = new TimeSeries(month_name);
for( int i = 0; i < x2.length; i++)
{
series2.add(x2[i], y2[i]);
}
XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();
dataset.addSeries(series);
dataset.addSeries(series2);
XYMultipleSeriesRenderer mRenderer = new XYMultipleSeriesRenderer(); // Holds a collection of XYSeriesRenderer and customizes the graph
XYSeriesRenderer renderer = new XYSeriesRenderer(); // This will be used to customize line 1
XYSeriesRenderer renderer2 = new XYSeriesRenderer(); // This will be used to customize line 2
mRenderer.addSeriesRenderer(renderer);
mRenderer.addSeriesRenderer(renderer2);
// Customization time for line 1!
renderer.setColor(getResources().getColor(R.color.complementary));
renderer.setPointStyle(PointStyle.SQUARE);
renderer.setFillPoints(true);
// Customization time for line 2!
renderer2.setColor(getResources().getColor(R.color.base));
renderer2.setPointStyle(PointStyle.DIAMOND);
renderer2.setFillPoints(true);
mChartView = ChartFactory.getLineChartView(getActivity(), dataset, mRenderer);
//Set Chart Title and labels
mRenderer.setChartTitle("Temperature Tracking");
mRenderer.setChartTitleTextSize(getResources().getDimension(R.dimen.largeText));
mRenderer.setLabelsColor(getResources().getColor(R.color.primaryTextDark));
//YAxis of Temp
mRenderer.setYTitle("Temperature", 0);
mRenderer.setYAxisMin(80, 0);
mRenderer.setYAxisMax(110, 0);
mRenderer.setYLabelsAlign(Align.CENTER);
mRenderer.setYLabelsColor(0, getResources().getColor(R.color.primaryTextDark));
//XAxis of month
mRenderer.setXLabels(20);
mRenderer.setXTitle(month_name);
mRenderer.setXAxisMin(1);
mRenderer.setXAxisMax(daysInMonth);
mRenderer.setXLabelsColor(getResources().getColor(R.color.primaryTextDark));
//Set the display
mRenderer.setMarginsColor(getResources().getColor(R.color.transparent));
mRenderer.setShowCustomTextGrid(true);
mRenderer.setAxisTitleTextSize(getResources().getDimension(R.dimen.mediumText));
mRenderer.setLabelsTextSize(getResources().getDimension(R.dimen.smallMediumText));
mRenderer.setPanEnabled(false, false);
mRenderer.setClickEnabled(false);
mRenderer.setZoomEnabled(false, false);
return mChartView;
}
@SuppressWarnings("unused")
public static boolean isNumeric(String str)
{
try
{
double d = Double.parseDouble(str);
}
catch(NumberFormatException nfe)
{
return false;
}
return true;
}
}
噢，这里是那些颜色：
<color name ="base">#51bbc2</color>
<color name ="complementary">#C25951</color>
