Android统计图表绘制：基于新版MPAndroidChart绘制数理统计柱状图

待我称王封你为后i 2023-10-17 18:37 62阅读 0赞

**Android统计图表绘制：基于新版MPAndroidChart绘制数理统计柱状图**

github上的开源项目MPAndroidChart在最新的3.0.3中，绘制图表的机制有所改变，从数据到图形，需要以新的方式绘制。现在以3.0.3为例，绘制一个简单的柱状图。

使用之前要添加引用：

implementation 'com.github.PhilJay:MPAndroidChart:v3.0.3'

写一个布局：

然后在上层Java代码处理：

package zhangphil.demo;
    
    import android.graphics.Color;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    
    import com.github.mikephil.charting.animation.Easing;
    import com.github.mikephil.charting.charts.BarChart;
    import com.github.mikephil.charting.components.AxisBase;
    import com.github.mikephil.charting.components.Legend;
    import com.github.mikephil.charting.components.XAxis;
    import com.github.mikephil.charting.components.YAxis;
    import com.github.mikephil.charting.data.BarData;
    import com.github.mikephil.charting.data.BarDataSet;
    import com.github.mikephil.charting.data.BarEntry;
    import com.github.mikephil.charting.data.Entry;
    import com.github.mikephil.charting.formatter.IAxisValueFormatter;
    import com.github.mikephil.charting.formatter.IValueFormatter;
    import com.github.mikephil.charting.interfaces.datasets.IBarDataSet;
    import com.github.mikephil.charting.utils.ViewPortHandler;
    
    import java.util.ArrayList;
    
    public class MainActivity extends AppCompatActivity {
        private String[] types = {"银行", "非银金融", "建筑材料", "化工", "医药生物", "电子"};
        private float[] changes = {27.91f, 5.9f, -0.4f, -17.79f, -21.85f, -39.58f};
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            BarChart mChart = findViewById(R.id.bar_chart);
            initBarChart(mChart);
            setBarChartData(types.length, mChart);
        }
    
        private void initBarChart(BarChart mBarChart) {
            mBarChart.setBackgroundColor(Color.WHITE);
            mBarChart.setDrawGridBackground(false); //网格
            mBarChart.getDescription().setEnabled(false);//描述
            //背景阴影
            mBarChart.setDrawBarShadow(false);
    
            //显示边界
            mBarChart.setDrawBorders(false);
    
            //设置动画效果
            mBarChart.animateY(1000, Easing.EasingOption.Linear);
            mBarChart.animateX(1000, Easing.EasingOption.Linear);
    
            //折线图例 标签 设置
            Legend l = mBarChart.getLegend();
            l.setEnabled(false);
    
            YAxis leftAxis = mBarChart.getAxisLeft();
            YAxis rightAxis = mBarChart.getAxisRight();
            leftAxis.setAxisMinimum(0f);
            rightAxis.setAxisMinimum(0f);
            leftAxis.setEnabled(false);
            rightAxis.setEnabled(false);
    
            XAxis xAxis = mBarChart.getXAxis();
    
            //XY轴的设置
            //X轴设置显示位置在底部
            xAxis.setPosition(XAxis.XAxisPosition.BOTTOM);
            //xAxis.setGranularity(1f);
    
            //xAxis.setDrawAxisLine(true);
            xAxis.setDrawGridLines(false);
    
            xAxis.setTextColor(0xff74828F);
            xAxis.setTextSize(10f);
            xAxis.setAxisLineColor(0xffe0e0e0);
    
            xAxis.setValueFormatter(new IAxisValueFormatter() {
                @Override
                public String getFormattedValue(float value, AxisBase axis) {
                    int idx = (int) value;
                    return types[idx];
                }
            });
        }
    
        private void setBarChartData(int count, BarChart mChart) {
            ArrayList<BarEntry> yVals = new ArrayList<>();
    
            int[] colors = new int[count];
    
            for (int i = 0; i < count; i++) {
                float val = changes[i];
    
                if (val > 0) {
                    colors[i] = 0xffF04933;
                }
    
                if (val < 0) {
                    colors[i] = 0xff2BBE53;
                }
    
                yVals.add(new BarEntry(i, Math.abs(val)));
            }
    
            BarDataSet mBarDataSet = new BarDataSet(yVals, "股票数据");
            mBarDataSet.setDrawIcons(false);
            mBarDataSet.setColors(colors);
            mBarDataSet.setValueTextSize(12f);
            mBarDataSet.setValueTextColor(0xff74828F);
    
            ArrayList<IBarDataSet> dataSets = new ArrayList<>();
            dataSets.add(mBarDataSet);
    
            BarData mBarData = new BarData(dataSets);
            mBarData.setBarWidth(0.6f);
    
            mBarData.setValueFormatter(new IValueFormatter() {
                @Override
                public String getFormattedValue(float value, Entry entry, int dataSetIndex, ViewPortHandler viewPortHandler) {
                    int idx = (int) entry.getX();
                    return String.valueOf(changes[idx]);
                }
            });
    
            mChart.setData(mBarData);
        }
    }

代码运行后的结果如图所示：

![20180309151144485][]

[20180309151144485]: https://img-blog.csdn.net/20180309151144485