问题
I want to make Line Chart Graph, but i have problem to show value string in xAxis, im used Library Github from MPAndroidChart to LineChart. Please help me how to add String Value and actually to much question i want ask
private void drawLineChartLine(){
private float[] yDataL = {40, 60, 70, 80};
private String[] xDataL = {"Week 1", "Week 1" , "Week 3" , "Week 4"};
ArrayList<Entry> yEntrys = new ArrayList<>();
final ArrayList<String> xEntrys = new ArrayList<>();
for(int i = 0; i < yDataL.length; i++){
yEntrys.add(new Entry(yDataL[i] ,i));
}
for(int i = 1; i < xDataL.length; i++){
xEntrys.add(xDataL[i]);
}
//create the data set
LineDataSet lineDataset = new LineDataSet(yEntrys, "assa");
XAxis xAxis = lineChart.getXAxis();
xAxis.setPosition(XAxis.XAxisPosition.BOTTOM);
xAxis.setDrawGridLines(false);
xAxis.setValueFormatter(new IAxisValueFormatter() {
@Override
public String getFormattedValue(float value, AxisBase axis) {
return xEntrys.get((int) value);
}
});
LineData lineData = new LineData(lineDataset);
lineChart.setData(lineData);
lineChart.invalidate();
}
i got error
Invalid index 40, size is 6
in Code
xAxis.setValueFormatter(new IAxisValueFormatter() {
@Override
public String getFormattedValue(float value, AxisBase axis) {
return xEntrys.get((int) value);
}
});
回答1:
public class IndexAxisValueFormatter extends ValueFormatter
{
private String[] mValues = new String[] {};
private int mValueCount = 0;
/**
* An empty constructor.
* Use `setValues` to set the axis labels.
*/
public IndexAxisValueFormatter() {
}
/**
* Constructor that specifies axis labels.
*
* @param values The values string array
*/
public IndexAxisValueFormatter(String[] values) {
if (values != null)
setValues(values);
}
/**
* Constructor that specifies axis labels.
*
* @param values The values string array
*/
public IndexAxisValueFormatter(Collection<String> values) {
if (values != null)
setValues(values.toArray(new String[values.size()]));
}
@Override
public String getFormattedValue(float value, AxisBase axisBase) {
int index = Math.round(value);
if (index < 0 || index >= mValueCount || index != (int)value)
return "";
return mValues[index];
}
public String[] getValues()
{
return mValues;
}
public void setValues(String[] values)
{
if (values == null)
values = new String[] {};
this.mValues = values;
this.mValueCount = values.length;
}
}
Add the below code in the method where you are trying to display Bar Chart.
final String[] weekdays = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"}; // Your List / array with String Values For X-axis Labels
// Set the value formatter
XAxis xAxis = chart.getXAxis();
xAxis.setValueFormatter(new IndexAxisValueFormatter(weekdays));
It Solved! Happy Coding.
回答2:
Here the easy method to dynamic string label (XAxis),
XAxis xAxis = lineChart.getXAxis();
xAxis.setPosition(XAxis.XAxisPosition.BOTTOM);
xAxis.setDrawGridLines(false);
xAxis.setValueFormatter(new IndexAxisValueFormatter(getAreaCount));
public ArrayList<String> getAreaCount() {
ArrayList<String> label = new ArrayList<>();
for (int i = 0; i < areaList.size(); i++)
label.add(areaList.get(i).getTopicName());
return label;
}
回答3:
You're accessing ArrayList index that is way out of bounds, because you are trying to use value as an index. You need to find index of value to return it.
xAxis.setValueFormatter(new IAxisValueFormatter() {
@Override
public String getFormattedValue(float value, AxisBase axis) {
for (int i = 0 ; i < yEntrys.size(); ++i) {
if (yEntrys.get(i).equals(value)) {
return xEntrys.get(i);
}
}
return null;
}
});
回答4:
According to the new update v3.1.0 IAxisValueFormatter method is depreciated.
So with the use of com.github.mikephil.charting.formatter.IndexAxisValueFormatter we can show month list in x-Axis
private List<Entry> getIncomeEntries() {
ArrayList<Entry> incomeEntries = new ArrayList<>();
incomeEntries.add(new Entry(1, 11300));
incomeEntries.add(new Entry(2, 1390));
incomeEntries.add(new Entry(3, 1190));
incomeEntries.add(new Entry(4, 7200));
incomeEntries.add(new Entry(5, 4790));
incomeEntries.add(new Entry(6, 4500));
incomeEntries.add(new Entry(7, 8000));
incomeEntries.add(new Entry(8, 7034));
incomeEntries.add(new Entry(9, 4307));
incomeEntries.add(new Entry(10, 8762));
incomeEntries.add(new Entry(11, 4355));
incomeEntries.add(new Entry(12, 6000));
return incomeEntries.subList(0, 12);
}
In Oncreate method
ArrayList<ILineDataSet> dataSets = new ArrayList<>();
List<String> xAxisValues = new ArrayList<>(Arrays.asList("Jan", "Feb", "March", "April", "May", "June","July", "August", "September", "October", "November", "Decemeber"));
List<Entry> incomeEntries = getIncomeEntries();
dataSets = new ArrayList<>();
LineDataSet set1;
set1 = new LineDataSet(incomeEntries, "Income");
set1.setColor(Color.rgb(65, 168, 121));
set1.setValueTextColor(Color.rgb(55, 70, 73));
set1.setValueTextSize(10f);
set1.setMode(LineDataSet.Mode.CUBIC_BEZIER);
dataSets.add(set1);
//customization
LineChart mLineGraph = findByViewId(R.id.line_chart);
mLineGraph.setTouchEnabled(true);
mLineGraph.setDragEnabled(true);
mLineGraph.setScaleEnabled(false);
mLineGraph.setPinchZoom(false);
mLineGraph.setDrawGridBackground(false);
mLineGraph.setExtraLeftOffset(15);
mLineGraph.setExtraRightOffset(15);
//to hide background lines
mLineGraph.getXAxis().setDrawGridLines(false);
mLineGraph.getAxisLeft().setDrawGridLines(false);
mLineGraph.getAxisRight().setDrawGridLines(false);
//to hide right Y and top X border
YAxis rightYAxis = mLineGraph.getAxisRight();
rightYAxis.setEnabled(false);
YAxis leftYAxis = mLineGraph.getAxisLeft();
leftYAxis.setEnabled(false);
XAxis topXAxis = mLineGraph.getXAxis();
topXAxis.setEnabled(false);
XAxis xAxis = mLineGraph.getXAxis();
xAxis.setGranularity(1f);
xAxis.setCenterAxisLabels(true);
xAxis.setEnabled(true);
xAxis.setDrawGridLines(false);
xAxis.setPosition(XAxis.XAxisPosition.BOTTOM);
set1.setLineWidth(4f);
set1.setCircleRadius(3f);
set1.setDrawValues(false);
set1.setCircleHoleColor(getResources().getColor(R.color.pie_color_4));
set1.setCircleColor(getResources().getColor(R.color.pie_color_4));
//String setter in x-Axis
mLineGraph.getXAxis().setValueFormatter(new com.github.mikephil.charting.formatter.IndexAxisValueFormatter(xAxisValues));
LineData data = new LineData(dataSets);
mLineGraph.setData(data);
mLineGraph.animateX(2000);
mLineGraph.invalidate();
mLineGraph.getLegend().setEnabled(false);
mLineGraph.getDescription().setEnabled(false);
回答5:
Simple implentation
XAxis xAxis = mChart.getXAxis();
xAxis.setPosition(XAxis.XAxisPosition.BOTTOM);
xAxis.setDrawGridLines(true);
xAxis.setGranularity(1f);
xAxis.setGranularityEnabled(true);
final String xVal[]={"Val1","Val2","Val3"};
xAxis.setValueFormatter(new IAxisValueFormatter() {
@Override
public String getFormattedValue(float value, AxisBase axis) {
return xVal[(int) value-1]; // xVal is a string array
}
});
回答6:
The methods mentioned aboves seems to be deprecated.
xAxis.setValueFormatter(new ValueFormatter() {
@Override
public String getFormattedValue(float value) {
// return the string va
return your_string_basedon_value_as_index;
}
});
来源：https://stackoverflow.com/questions/45320457/how-to-set-string-value-of-xaxis-in-mpandroidchart