如何使用MPAndroidChart创建带有分组条形的BarChart？

Question

我怎么能比较两组使用数据BarChart的MPAndroidChart.

它应该如下图所示:

我编辑了一个代码,我从github的示例项目中获取.我怎样才能将 100f and 110f价值放在一个Xaxis标签上Whole Number

        Score score1 = new Score(100f, 0, "Whole Number");
        mRealm.copyToRealm(score1);
        Score score2 = new Score(110f, 0, "Whole Number");
        mRealm.copyToRealm(score2);

Answer 1

由于BarData构造函数已有更新,因此您需要使用以下代码:

        BarChart barChart = (BarChart) view.findViewById(R.id.chart);

        barChart.setDrawBarShadow(false);
        barChart.setDrawValueAboveBar(true);
        barChart.setDescription("");
        barChart.setMaxVisibleValueCount(50);
        barChart.setPinchZoom(false);
        barChart.setDrawGridBackground(false);

        XAxis xl = barChart.getXAxis();
        xl.setGranularity(1f);
        xl.setCenterAxisLabels(true);
        xl.setValueFormatter(new AxisValueFormatter() {
            @Override
            public String getFormattedValue(float value, AxisBase axis) {
                return String.valueOf((int) value);
            }

            @Override
            public int getDecimalDigits() {
                return 0;
            }
        });

        YAxis leftAxis = barChart.getAxisLeft();
        leftAxis.setValueFormatter(new AxisValueFormatter() {
            @Override
            public String getFormattedValue(float value, AxisBase axis) {
                return String.valueOf((int) value);
            }

            @Override
            public int getDecimalDigits() {
                return 0;
            }
        });
        leftAxis.setDrawGridLines(false);
        leftAxis.setSpaceTop(30f);
        leftAxis.setAxisMinValue(0f); // this replaces setStartAtZero(true
        barChart.getAxisRight().setEnabled(false);

        //data
        float groupSpace = 0.04f;
        float barSpace = 0.02f; // x2 dataset
        float barWidth = 0.46f; // x2 dataset
        // (0.46 + 0.02) * 2 + 0.04 = 1.00 -> interval per "group"

        int startYear = 1980;
        int endYear = 1985;


        List<BarEntry> yVals1 = new ArrayList<BarEntry>(); 
        List<BarEntry> yVals2 = new ArrayList<BarEntry>();


        for (int i = startYear; i < endYear; i++) {
            yVals1.add(new BarEntry(i, 0.4f));
        }

        for (int i = startYear; i < endYear; i++) {
            yVals2.add(new BarEntry(i, 0.7f));
        }


        BarDataSet set1, set2;

        if (barChart.getData() != null && barChart.getData().getDataSetCount() > 0) {
            set1 = (BarDataSet)barChart.getData().getDataSetByIndex(0);
            set2 = (BarDataSet)barChart.getData().getDataSetByIndex(1);
            set1.setValues(yVals1);
            set2.setValues(yVals2);
            barChart.getData().notifyDataChanged();
            barChart.notifyDataSetChanged();
        } else {
            // create 2 datasets with different types
            set1 = new BarDataSet(yVals1, "Company A");
            set1.setColor(Color.rgb(104, 241, 175));
            set2 = new BarDataSet(yVals2, "Company B");
            set2.setColor(Color.rgb(164, 228, 251));

            ArrayList<IBarDataSet> dataSets = new ArrayList<IBarDataSet>();
            dataSets.add(set1);
            dataSets.add(set2);

            BarData data = new BarData(dataSets);
            barChart.setData(data);
        }

        barChart.getBarData().setBarWidth(barWidth);
        barChart.getXAxis().setAxisMinValue(startYear);
        barChart.groupBars(startYear, groupSpace, barSpace);
        barChart.invalidate();

这就是它的样子

Answer 2

是的,这可以很容易地完成.

你需要的是一个BarChart多重BarDataSets,每组(在你的情况下)代表一个性别(男人或女人).

• 以下是如何使用多个DataSet创建BarChart的示例
• 这是一个如何在Realm.io中使用MPAndroidChart的教程

示例代码(不带realm.io)

    List<String> xValues = ...; // "Denmark", "Finland", ...

    XAxis xAxis = chart.getXAxis();
    xAxis.setValueFormatter(new MyValueFormatter(xValues));

    // create 2 datasets 
    BarDataSet set1 = new BarDataSet(valuesMen, "Men");
    set1.setColor(Color.BLUE);
    BarDataSet set2 = new BarDataSet(valuesWomen, "Women");
    set2.setColor(Color.RED);

    BarData data = new BarData(set1, set2);
    chart.setData(data);
    chart.groupBars(...); // available since release v3.0.0
    chart.invalidate(); // refresh

如果您需要进一步的帮助,请参阅维基上有关分组的详细教程BarChart.

如果要将值BarChart堆叠在一起,则需要创建堆叠条形图:Android Stacked Bars Chart

Answer 3

我尝试的大多数答案都存在未对齐,非居中标签或条形图被隐藏在屏幕空间之外的问题.所以经过一些尝试,我有一个适当的工作poc.

最后4行是最重要的.

    ArrayList<BarEntry> barEntries = new ArrayList<>();
    ArrayList<BarEntry> barEntries1 = new ArrayList<>();
    ArrayList<BarEntry> barEntries2 = new ArrayList<>();
    ArrayList<BarEntry> barEntries3 = new ArrayList<>();

    barEntries.add(new BarEntry(1,989.21f));
    barEntries.add(new BarEntry(2,420.22f));
    barEntries.add(new BarEntry(3,758));
    barEntries.add(new BarEntry(4,3078.97f));
    barEntries.add(new BarEntry(5,14586.96f));
    barEntries.add(new BarEntry(6,400.4f));
    barEntries.add(new BarEntry(7,5888.58f));

    barEntries1.add(new BarEntry(1,950));
    barEntries1.add(new BarEntry(2,791));
    barEntries1.add(new BarEntry(3,630));
    barEntries1.add(new BarEntry(4,782));
    barEntries1.add(new BarEntry(5,2714.54f));
    barEntries1.add(new BarEntry(6,500));
    barEntries1.add(new BarEntry(7,2173.36f));

    barEntries2.add(new BarEntry(1,900));
    barEntries2.add(new BarEntry(2,691));
    barEntries2.add(new BarEntry(3,1030));
    barEntries2.add(new BarEntry(4,382));
    barEntries2.add(new BarEntry(5,2714f));
    barEntries2.add(new BarEntry(6,5000));
    barEntries2.add(new BarEntry(7,1173f));

    barEntries3.add(new BarEntry(1,200));
    barEntries3.add(new BarEntry(2,991));
    barEntries3.add(new BarEntry(3,1830));
    barEntries3.add(new BarEntry(4,3082));
    barEntries3.add(new BarEntry(5,214));
    barEntries3.add(new BarEntry(6,5600));
    barEntries3.add(new BarEntry(7,9173));

    BarDataSet barDataSet = new BarDataSet(barEntries,"DATA SET 1");
    barDataSet.setColor(Color.parseColor("#F44336"));
    BarDataSet barDataSet1 = new BarDataSet(barEntries1,"DATA SET 2");
    barDataSet1.setColors(Color.parseColor("#9C27B0"));
    BarDataSet barDataSet2 = new BarDataSet(barEntries2,"DATA SET 3");
    barDataSet1.setColors(Color.parseColor("#e241f4"));
    BarDataSet barDataSet3 = new BarDataSet(barEntries3,"DATA SET 4");
    barDataSet1.setColors(Color.parseColor("#42f46e"));

    String[] months = new String[] {"TYPE 1", "TYPE 2", "TYPE 3", "TYPE 4"};
    BarData data = new BarData(barDataSet,barDataSet1,barDataSet2,barDataSet3);
    barChart.setData(data);

    XAxis xAxis = barChart.getXAxis();
    xAxis.setValueFormatter(new IndexAxisValueFormatter(months));
    barChart.getAxisLeft().setAxisMinimum(0);
    xAxis.setPosition(XAxis.XAxisPosition.BOTTOM);
    xAxis.setGranularity(1);
    xAxis.setCenterAxisLabels(true);
    xAxis.setGranularityEnabled(true);

    float barSpace = 0.02f;
    float groupSpace = 0.3f;
    int groupCount = 4;

    //IMPORTANT *****
    data.setBarWidth(0.15f);
    barChart.getXAxis().setAxisMinimum(0);
    barChart.getXAxis().setAxisMaximum(0 + barChart.getBarData().getGroupWidth(groupSpace, barSpace) * groupCount);
    barChart.groupBars(0, groupSpace, barSpace); // perform the "explicit" grouping
    //***** IMPORTANT

我得到的最终结果是: