Android LineChart绘制折线图的示例详解

1.首先在 build.gradle 里导入包

implementation 'com.github.PhilJay:MPAndroidChart:v3.1.0' 

2.新建 启动Activity  

LineChartActivity 如下

**
 * @Author: Bytezero_zhengLei
 * @Time: 2023/3/24 10:12
 * @Project_Name: LineChartActivity.java
 * @Email: [email protected]
 * @Description:
 * @TODO: 折线图
 */

public class LineChartActivity extends AppCompatActivity {

    private LineChart lineChart;
    List list = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_line_chart);

        lineChart = (LineChart) findViewById(R.id.linechart);

        lineChart = MPAndroidUtil.initChart(this, lineChart);




        for (int i =0; i <10; i ++){
            IncomeBean incomeBean = new IncomeBean(36.5,"2020-01-01 00:00:00");
            list.add(incomeBean);

        }

        // 开始画折线图
        setLineChart(list, "BMI" + "kg/²", getResources().getColor(R.color.bule_title));
    }


    //设置折线


    public void setLineChart(List mLineChart, String string, int color) {
        lineChart = MPAndroidUtil.initChart(this, lineChart);
        lineChart.setData(MPAndroidUtil.showLineChart(mLineChart, string, color));
        //设置一页最大显示个数为6，超出部分就滑动
        float ratio = (float) mLineChart.size() / (float) 6;
        //显示的时候是按照多大的比率缩放显示,1f表示不放大缩小
        // lineChart.zoom(ratio, 1f, 0, 0);
        // 设置填充图
        Drawable drawable = getResources().getDrawable(R.drawable.fade_blue);
        MPAndroidUtil.setChartFillDrawable(drawable, lineChart);
        // 设置点击的弹窗
        MPAndroidUtil.setMarkerView1(lineChart);


       /* lineChart.getLineData().addDataSet(MPAndroidUtil.addLine(list1, "地位条", getResources().getColor(R.color.text_orange)));
        lineChart.invalidate();*/

    }
}

3.新建数据 IncomeBean

/**
 * @Author: Bytezero_zhengLei
 * @Time: 2023/3/24 10:24
 * @Project_Name: IncomeBean.java
 * @Email: [email protected]
 * @Description:
 * @TODO:
 */

public class IncomeBean implements Serializable {
    public String tradeDate;// 时间
    public double value;// 数值

    public IncomeBean(double mValue, String mTradeDate) {
        tradeDate = mTradeDate;
        value = mValue;
    }

    @Override
    public String toString() {
        return "IncomeBean{" +
                "tradeDate='" + tradeDate + '\'' +
                ", value=" + value +
                '}';
    }
}

4.制定折线图的属性  MPAndroidUtil

/**
 * @Author: Bytezero_zhengLei
 * @Time: 2023/3/24 10:20
 * @Project_Name: MPAndroidUtil.java
 * @Email: [email protected]
 * @Description:
 * @TODO:
 */

public class MPAndroidUtil {
    private static final String TAG = "MPAndroidUtil";
    private static XAxis xAxis = null;                //X轴
    private static YAxis leftYAxis;            //左侧Y轴
    private static YAxis rightYaxis;           //右侧Y轴
    private static Legend legend;              //图例


    /**
     * 初始化图表 折线图
     */
    public static LineChart initChart(Context context, LineChart lineChart) {

        /***图表设置***/
        //是否展示网格线
        lineChart.setDrawGridBackground(false);
        //是否显示边界
        lineChart.setDrawBorders(false);
        //是否可以拖动
        lineChart.setDragEnabled(false);
        //是否有触摸事件
        lineChart.setTouchEnabled(true);
        // 关闭双击放大功能
        lineChart.setDoubleTapToZoomEnabled(false);
        //设置XY轴动画效果
        lineChart.animateY(2500);
        lineChart.animateX(1500);

        lineChart.setBackgroundColor(context.getResources().getColor(R.color.white));


        /***XY轴的设置***/
        xAxis = null;
        xAxis = lineChart.getXAxis();
        leftYAxis = lineChart.getAxisLeft();
        rightYaxis = lineChart.getAxisRight();
        //X轴设置显示位置在底部
        xAxis.setPosition(XAxis.XAxisPosition.BOTTOM);
        xAxis.setAxisMinimum(0f);
        xAxis.setGranularity(1f);
        //保证Y轴从0开始，不然会上移一点
        leftYAxis.setAxisMinimum(0f);
        rightYaxis.setAxisMinimum(0f);

        // 但还是显示了网格线，而且不是我们想要的 虚线 。其实那是 X Y轴自己的网格线，禁掉即可
        xAxis.setDrawGridLines(false);
        rightYaxis.setDrawGridLines(false);
        leftYAxis.setDrawGridLines(true);
        //设置X Y轴网格线为虚线（实体线长度、间隔距离、偏移量：通常使用 0）
        leftYAxis.enableGridDashedLine(10f, 10f, 0f);
        // 目标效果图没有右侧Y轴，所以去掉右侧Y轴
        rightYaxis.setEnabled(false);

        /***折线图例 标签 设置***/
        legend = lineChart.getLegend();
        //legend.setEnabled(false);
        //设置显示类型，LINE CIRCLE SQUARE EMPTY 等等 多种方式，查看LegendForm 即可
        legend.setForm(Legend.LegendForm.LINE);
        legend.setTextSize(12f);
        //显示位置 左下方
        legend.setVerticalAlignment(Legend.LegendVerticalAlignment.TOP);
        legend.setHorizontalAlignment(Legend.LegendHorizontalAlignment.LEFT);
        legend.setOrientation(Legend.LegendOrientation.HORIZONTAL);
        //是否绘制在图表里面
        legend.setDrawInside(false);
        // legend.setExtra(mLegendEntries);

//        lineChart.setNoDataText(context.getResources().getString(R.string.No_data));
        lineChart.setNoDataText("  ");
        // 设置右下角的提示
        Description description = new Description();
//        description.setText("需要展示的内容");
        description.setEnabled(false);
        lineChart.setDescription(description);

        lineChart.setExtraBottomOffset(2 * 8f);

        lineChart.setXAxisRenderer(new CustomXAxisRenderer(lineChart.getViewPortHandler(), lineChart.getXAxis(), lineChart.getTransformer(YAxis.AxisDependency.LEFT)));
        return lineChart;
    }


    /**
     * 曲线初始化设置 一个LineDataSet 代表一条曲线
     *
     * @param lineDataSet 线条
     * @param color       线条颜色
     * @param mode
     */
    public static LineDataSet initLineDataSet(LineDataSet lineDataSet, int color, LineDataSet.Mode mode) {
        lineDataSet.setColor(color);
        lineDataSet.setCircleColor(color);
        lineDataSet.setLineWidth(1f);
        lineDataSet.setCircleRadius(2f);
        //设置曲线值的圆点是实心还是空心
        lineDataSet.setDrawCircleHole(true);
        lineDataSet.setValueTextSize(10f);
        //设置折线图填充
        lineDataSet.setDrawFilled(true);
        lineDataSet.setFormLineWidth(1f);
        lineDataSet.setFormSize(15.f);
        if (mode == null) {
            //设置曲线展示为圆滑曲线（如果不设置则默认折线）
            lineDataSet.setMode(LineDataSet.Mode.CUBIC_BEZIER);
        } else {
            lineDataSet.setMode(mode);
        }
        // 不显示值
        lineDataSet.setDrawValues(false);
        return lineDataSet;

    }

    public static LineData showLineChart(final List dataList, String name, int color) {
        List entries = new ArrayList<>();
        for (int i = 0; i < dataList.size(); i++) {
            IncomeBean data = dataList.get(i);
            /**
             * 在此可查看 Entry构造方法，可发现 可传入数值 Entry(float x, float y)
             * 也可传入Drawable， Entry(float x, float y, Drawable icon) 可在XY轴交点 设置Drawable图像展示
             */
            Entry entry = new Entry(i, (float) data.value);
            entries.add(entry);
        }
        xAxis.setValueFormatter(new IndexAxisValueFormatter() {
            @Override
            public String getFormattedValue(float value) {
                String tradeDate;
                try {
                    tradeDate = dataList.get((int) value % dataList.size()).tradeDate;
                } catch (Exception mE) {
                    tradeDate = "2020-01-01 00:00:00";
                }

                return StrToStr("yyyy-MM-dd HH:mm:ss", "MM-dd HH:mm", tradeDate);
            }
        });


        xAxis.setLabelCount(6, false);

        leftYAxis.setLabelCount(8);
        // 每一个LineDataSet代表一条线
        LineDataSet lineDataSet = new LineDataSet(entries, name);
        lineDataSet = initLineDataSet(lineDataSet, color, LineDataSet.Mode.CUBIC_BEZIER);
        LineData lineData = new LineData(lineDataSet);
        return lineData;

    }

    public static void setMarkerView1(LineChart lineChart) {
//        LineChartMarkView1 mv = new LineChartMarkView1(MApplication.getInstance(), xAxis.getValueFormatter());
        LineChartMarkView1 mv = new LineChartMarkView1(lineChart.getContext(), xAxis.getValueFormatter());
        mv.setChartView(lineChart);
        lineChart.setMarker(mv);
        lineChart.invalidate();
    }


    /*
     * 设置线条填充背景颜色
     *
     * @param drawable
     */
    public static LineChart setChartFillDrawable(Drawable drawable, LineChart mLineChart) {
        if (mLineChart.getData() != null && mLineChart.getData().getDataSetCount() > 0) {
            LineDataSet lineDataSet = (LineDataSet) mLineChart.getData().getDataSetByIndex(0);
            //避免在 initLineDataSet()方法中 设置了 lineDataSet.setDrawFilled(false); 而无法实现效果
            lineDataSet.setDrawFilled(true);
            lineDataSet.setFillDrawable(drawable);

            mLineChart.invalidate();

        }
        return mLineChart;
    }


    // 传入某种格式的时间格式，得到特定的时间格式
    public static String StrToStr(String SimpleDateFormat_in, String SimpleDateFormat_out, String str) {
        SimpleDateFormat format = new SimpleDateFormat(SimpleDateFormat_in);
        SimpleDateFormat format1 = new SimpleDateFormat(SimpleDateFormat_out);
        Date date = null;
        try {
            date = format.parse(str);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return format1.format(date.getTime());
    }


}

5.LineChartMarkView1

**
 * @Author: Bytezero_zhengLei
 * @Time: 2023/3/24 10:45
 * @Project_Name: LineChartMarkView1.java
 * @Email: [email protected]
 * @Description:
 * @TODO:
 */

public class LineChartMarkView1 extends MarkerView {

    private TextView tvDate;
    private TextView tvValue;
    private IAxisValueFormatter xAxisValueFormatter;
    DecimalFormat df = new DecimalFormat(".00");

    public LineChartMarkView1(Context context, IAxisValueFormatter xAxisValueFormatter) {
        super(context, R.layout.layout_markview1);
        this.xAxisValueFormatter = xAxisValueFormatter;

        tvDate = findViewById(R.id.tv_date);
        tvValue = findViewById(R.id.tv_value);
    }

    @SuppressLint("SetTextI18n")
    @Override
    public void refreshContent(Entry e, Highlight highlight) {
        Chart chart = getChartView();
        if (chart instanceof LineChart) {
            LineData lineData = ((LineChart) chart).getLineData();
            //获取到图表中的所有曲线
            List dataSetList = lineData.getDataSets();
            for (int i = 0; i < dataSetList.size(); i++) {
                LineDataSet dataSet = (LineDataSet) dataSetList.get(i);
                //获取到曲线的所有在Y轴的数据集合，根据当前X轴的位置 来获取对应的Y轴值
                float y = dataSet.getValues().get((int) e.getX()).getY();
                if (i == 0) {
                    tvValue.setText(dataSet.getLabel() + "：" + e.getY());
                }
            }
            tvDate.setText(xAxisValueFormatter.getFormattedValue(e.getX(), null));
        }

        super.refreshContent(e, highlight);
    }

    @Override
    public MPPointF getOffset() {
        return new MPPointF(-(getWidth() / 2), -getHeight());

    }
}

6.CustomXAxisRenderer

/**
 * @Author: Bytezero_zhengLei
 * @Time: 2023/3/24 10:23
 * @Project_Name: CustomXAxisRenderer.java
 * @Email: [email protected]
 * @Description:
 * @TODO:
 */

public class CustomXAxisRenderer extends XAxisRenderer {
    public CustomXAxisRenderer(ViewPortHandler viewPortHandler, XAxis xAxis, Transformer trans) {
        super(viewPortHandler, xAxis, trans);
    }

    @Override
    protected void drawLabel(Canvas c, String formattedLabel, float x, float y, MPPointF anchor, float angleDegrees) {
//        super.drawLabel(c, formattedLabel, x, y, anchor, angleDegrees);//注释掉这个，否则坐标标签复写两次
        String[] lines = formattedLabel.split(" ");
        for (int i = 0; i < lines.length; i++) {
            float vOffset = i * mAxisLabelPaint.getTextSize();
            Utils.drawXAxisValue(c, lines[i], x, y + vOffset, mAxisLabelPaint, anchor, angleDegrees);
        }
    }
}

7.一些 小的  layout  

LineChartMarkView1的layout

LineChartActivity中的 layout

这样就ok了

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