MPAndrodChart 绘制分组柱状图实例

# MPAndrodChart 绘制分组柱状图实例
自己摸索了许久写出来的，只给出死方法例子，有些地方有注释，不懂得话可以评论区留言

# 布局文件
```
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

<com.github.mikephil.charting.charts.BarChart
        android:id="@+id/barchart1"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>
```

# Java 代码
> 我直接分享方法了
> 你可以直接在 `XXXXXActivity` 的 `onCreate()`  方法调用本方法即可
```
//我直接分享方法了
//你直接再 Activity 的 onCreate()  方法调用本方法即可
private void drawBarChart() {
    //这个不必多解释吧
    BarChart barChart = findViewById(R.id.barchart1);

barChart.getLegend().setHorizontalAlignment(Legend.LegendHorizontalAlignment.CENTER);
    barChart.getLegend().setVerticalAlignment(Legend.LegendVerticalAlignment.TOP);

final Description description = new Description();
    description.setPosition(200, 60);
    description.setText("道路拥堵状况");//设置简介
    description.setTextSize(10f);
    barChart.setDescription(description);

List<BarEntry> barEntryList = new ArrayList<>();
    barEntryList.add(new BarEntry(1, 4));
    barEntryList.add(new BarEntry(2, 5));
    barEntryList.add(new BarEntry(3, 4));
    barEntryList.add(new BarEntry(4, 3));
    barEntryList.add(new BarEntry(5, 2));
    barEntryList.add(new BarEntry(6, 1));
    barEntryList.add(new BarEntry(7, 3));

List<BarEntry> barEntryList2 = new ArrayList<>();
    barEntryList2.add(new BarEntry(1, 5));
    barEntryList2.add(new BarEntry(2, 4));
    barEntryList2.add(new BarEntry(3, 3));
    barEntryList2.add(new BarEntry(4, 2));
    barEntryList2.add(new BarEntry(5, 1));
    barEntryList2.add(new BarEntry(6, 2));
    barEntryList2.add(new BarEntry(7, 3));

List<BarEntry> barEntryList3 = new ArrayList<>();
    barEntryList3.add(new BarEntry(1, 4));
    barEntryList3.add(new BarEntry(2, 2));
    barEntryList3.add(new BarEntry(3, 3));
    barEntryList3.add(new BarEntry(4, 2));
    barEntryList3.add(new BarEntry(5, 4));
    barEntryList3.add(new BarEntry(6, 1));
    barEntryList3.add(new BarEntry(7, 1));

List<BarEntry> barEntryList4 = new ArrayList<>();
    barEntryList4.add(new BarEntry(1, 2));
    barEntryList4.add(new BarEntry(2, 1));
    barEntryList4.add(new BarEntry(3, 5));
    barEntryList4.add(new BarEntry(4, 2));
    barEntryList4.add(new BarEntry(5, 3));
    barEntryList4.add(new BarEntry(6, 4));
    barEntryList4.add(new BarEntry(7, 4));

List<BarEntry> barEntryList5 = new ArrayList<>();
    barEntryList5.add(new BarEntry(1, 1));
    barEntryList5.add(new BarEntry(2, 2));
    barEntryList5.add(new BarEntry(3, 2));
    barEntryList5.add(new BarEntry(4, 3));
    barEntryList5.add(new BarEntry(5, 5));
    barEntryList5.add(new BarEntry(6, 4));
    barEntryList5.add(new BarEntry(7, 3));

List<BarEntry> barEntryList6 = new ArrayList<>();
    barEntryList6.add(new BarEntry(1, 2));
    barEntryList6.add(new BarEntry(2, 1));
    barEntryList6.add(new BarEntry(3, 1));
    barEntryList6.add(new BarEntry(4, 2));
    barEntryList6.add(new BarEntry(5, 4));
    barEntryList6.add(new BarEntry(6, 3));
    barEntryList6.add(new BarEntry(7, 3));

List<BarEntry> barEntryList7 = new ArrayList<>();
    barEntryList7.add(new BarEntry(1, 4));
    barEntryList7.add(new BarEntry(2, 1));
    barEntryList7.add(new BarEntry(3, 2));
    barEntryList7.add(new BarEntry(4, 2));
    barEntryList7.add(new BarEntry(5, 3));
    barEntryList7.add(new BarEntry(6, 2));
    barEntryList7.add(new BarEntry(7, 1));

BarDataSet barDataSet = new BarDataSet(barEntryList, "学院路");
    BarDataSet barDataSet2 = new BarDataSet(barEntryList2, "联想路");
    BarDataSet barDataSet3 = new BarDataSet(barEntryList3, "医院路");
    BarDataSet barDataSet4 = new BarDataSet(barEntryList4, "幸福路");
    BarDataSet barDataSet5 = new BarDataSet(barEntryList5, "环城快速路");
    BarDataSet barDataSet6 = new BarDataSet(barEntryList6, "环城高速");
    BarDataSet barDataSet7 = new BarDataSet(barEntryList7, "停车场");

barDataSet.setColor(Color.parseColor("#bf382d"));
    barDataSet2.setColor(Color.parseColor("#2f4455"));
    barDataSet3.setColor(Color.parseColor("#60a0a7"));
    barDataSet4.setColor(Color.parseColor("#d48164"));
    barDataSet5.setColor(Color.parseColor("#91c6af"));
    barDataSet6.setColor(Color.parseColor("#769e83"));
    barDataSet7.setColor(Color.parseColor("#c98624"));

BarData barData = new BarData(barDataSet, barDataSet2, barDataSet3, barDataSet4,
            barDataSet5, barDataSet6, barDataSet7);
    barData.setDrawValues(false);

barChart.getXAxis().setValueFormatter(new IAxisValueFormatter() {
        @Override
        public String getFormattedValue(float value, AxisBase axis) {
            switch ((int) value) {
                case 0:
                    return "周一";
                case 10:
                    return "周二";
                case 20:
                    return "周三";
                case 30:
                    return "周四";
                case 40:
                    return "周五";
                case 50:
                    return "周六";

case 60:
                default:
                    return "周日";
            }
        }
    });

barChart.getAxisLeft().setYOffset(25f);//这样会向下偏移 50%
    barChart.getAxisLeft().setAxisMinimum(0f);
    barChart.getAxisLeft().setAxisMaximum(5f);
    barChart.getAxisLeft().setLabelCount(6, true);//设置间距
    barChart.getAxisLeft().setValueFormatter(new IAxisValueFormatter() {
        @Override
        public String getFormattedValue(float value, AxisBase axis) {
            switch ((int) value) {
                case 1:
                    return "畅通";
                case 2:
                    return "缓行";
                case 3:
                    return "一般拥堵";
                case 4:
                    return "中度拥堵";
                case 5:
                    return "严重拥堵";
                default:
                    return "";
            }
        }
    });

barChart.getAxisRight().setAxisMinimum(0f);
    barChart.getAxisRight().setAxisMaximum(5f);
    barChart.getAxisRight().setLabelCount(6, true);//设置间距

barChart.getXAxis().setTextSize(12f);
    barChart.getXAxis().setYOffset(-0);
    barChart.getXAxis().setAxisMinimum(1);
    barChart.getXAxis().setAxisMaximum(70);
    barChart.getXAxis().setPosition(XAxis.XAxisPosition.BOTTOM);
    barChart.getXAxis().setCenterAxisLabels(true);

barChart.getXAxis().setDrawAxisLine(false);//横线
    barChart.getXAxis().setDrawGridLines(false);//垂线

barChart.setData(barData);//先设置数据

float groupSpace = 2f;//0.3 * DaraSet
    float barSpace = 0.28f; //0.04 * DataSet

//0.1 * DataSet
    //然后再设置分组柱状图
    barChart.groupBars(.7f, groupSpace, barSpace);

barChart.invalidate();
}
```

# 运行截图
![Snipaste_2020-10-29_20-30-36.jpg][1]

[1]: https://cdn.nowtime.cc/2020/10/29/1302616410.jpg

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