Data Showing 0 and 1 only in y-axis if array contains only 0.0 double values.

[manojchandola]

LineChartDataSet *dataSet = [[LineChartDataSet alloc] initWithYVals:yVals label:strDisplayText];

If yVals contains all 0.0 values, then it shows 0 and 1 in the y-axis. But same records in android shows 0, 1, 2, 3,... .
Kindly, let me know the process to resolve this issue.

[danielgindi]

You can tell us what versions of the framework are you trying on iOS and Android, and show sample code on both platforms - so we can test to see the difference and debug.

[manojchandola]

Here y-axis array has values zero (0). So it shows three zeros(0) and three one(1) over the y-axis.
When i tried to pass x-axis (xVals) array with zero(0) count and dataset has 26 records, then in android it shows graph with y-axis coordinate as {0.0,0.2,0.4,0.6,0.8} , whereas in iOS it does not draw the graph.
this line of code : [_graphView setData:data]; sends this error message " setData is nil ".

iOS Code:

for (NSMutableArray *vals in yValsSet) {
LineChartDataSet *dataSet = [[LineChartDataSet alloc] initWithYVals:vals label:subMetric.displayText];
dataSet.axisDependency = AxisDependencyRight;

            dataSet.lineWidth = 2.f;
            dataSet.circleRadius = 0.0f;
            dataSet.fillAlpha = 65/255.f;

            if ([subMetric.displayText.uppercaseString isEqualToString:@"HOGGED"]){
                [dataSet setColor:colorsArray[0]];
                [dataSet setCircleColor:UIColor.blackColor];
            }
            else if ([subMetric.displayText.uppercaseString isEqualToString:@"IDLE"]){
                [dataSet setColor:colorsArray[1]];
                [dataSet setCircleColor:UIColor.blackColor];
            }
            else if ([subMetric.displayText.uppercaseString isEqualToString:@"STUCK"]) {
                [dataSet setColor:colorsArray[2]];
                [dataSet setCircleColor:UIColor.blackColor];
            }
            else {
                if (_metric.subMetrics.count == 2) {
                    if (dataSets.count == 0) {
                        [dataSet setColor:colorsArray[1]];
                        [dataSet setCircleColor:UIColor.blackColor];
                    }
                    else{
                        [dataSet setColor:colorsArray[0]];
                        [dataSet setCircleColor:UIColor.blackColor];
                    }
                }
                else
                {
                    if (dataSets.count == 0) {
                        [dataSet setColor:colorsArray[0]];
                        [dataSet setCircleColor:UIColor.blackColor];
                    }
                }

            }
            dataSet.fillColor = UIColor.redColor;
            dataSet.highlightColor = [UIColor colorWithRed:24/255.f green:117/255.f blue:117/255.f alpha:1.f];
            dataSet.drawCirclesEnabled = false;
            dataSet.drawCircleHoleEnabled = false;

            [dataSets addObject:dataSet];
        }

    }

    LineChartData *data = [[LineChartData alloc] initWithXVals:xVals dataSets:dataSets];
    [data setValueTextColor:UIColor.whiteColor];
    data.highlightEnabled = false;
    [data setValueFont:[UIFont fontWithName:@"HelveticaNeue-Light" size:9.0]];
    [_graphView setData:data];

Android Code:

for (int matricCount = 0; matricCount < subMetrices.size(); matricCount++) {

        ArrayList<Entry> values = new ArrayList<>();
        xVals = new ArrayList<>();
        for (int lineDataCount = 0; lineDataCount < subMetrices.get(matricCount).getAxisData().size(); lineDataCount++) {
            if (subMetrices.get(matricCount).getAxisData().get(lineDataCount).getValueMetrics() != null && !subMetrices.get(matricCount).getAxisData().get(lineDataCount).getValueMetrics().isEmpty()) {
                if (subMetrices.get(matricCount).getAxisData().get(lineDataCount).isAvailable()) {
                    if (!subMetrices.get(matricCount).getAxisData().get(lineDataCount).isRefresh()) {
                        float yValue = (new Double(subMetrices.get(matricCount).getAxisData().get(lineDataCount).getValueMetrics())).floatValue();
                        xVals.add(Utils.getTimeFromMillisecond(subMetrices.get(matricCount).getAxisData().get(lineDataCount).getCreatedAt(), "HH:mm"));
                        values.add(new Entry(yValue, lineDataCount));
                    }/*else{
                    addPointToDataSet(matricCount,values);
                    values=new ArrayList<>();
                }*/
                } else {
                    addPointToDataSet(matricCount, values);
                    values = new ArrayList<>();
                }
            }
        }
        addPointToDataSet(matricCount, values);
    }


    LineData data = new LineData(xVals, dataSets);
    mChart.setData(data);
    mChart.animateX(1000, Easing.EasingOption.EaseInOutQuart);
    mChart.invalidate();

[danielgindi]

Well going back to this issue (sorry, too many issues I forgot about this) I understand that what you are missing is telling the chart what to do for axis min/max (customAxisMin/customAxisMax). Otherwise, the axis range is 0.0 to 0.0. And it enlarges it to 1.0.