MPAndroidChart v3.0.0-beta1 LineData构造函数只接受1个参数

2 回答

• 0

  版本3.0初始化如下：

  LineChart lineChart = new LineChart(context);
  
  lineChart.setMinimumHeight(ToolBox.dpToPixels(context, 300));
  lineChart.setMinimumWidth(ToolBox.getScreenWidth());
  
  ArrayList<Entry> yVals = new ArrayList<>();    
  
  for(int i = 0; i < frigbot.getEquipment().getTemperatures().size(); i++)
      {
          Temperature temperature = frigbot.getEquipment().getTemperatures().get(i);
  
          yVals.add(new Entry(
                  i, temperature.getValue().floatValue()
          ));
      }
  
  LineDataSet dataSet = new LineDataSet(yVals, "graph name");
  dataSet.setMode(LineDataSet.Mode.CUBIC_BEZIER);
  dataSet.setCubicIntensity(0.2f);
  
  LineData data = new LineData(dataSet);
  
  lineChart.setData(data);
  

  看来我们无法指定自定义水平标签，LineChart本身会自动生成水平和垂直轴标签 .

  回复于 2024-04-21T00:10:43+08:00
• 0

  在这个版本中

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

  试试吧

  public class MainActivity extends AppCompatActivity {
  
  private LineChart lc;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      initView();
      initData();
  }
  
  public int ran() {
      Random ran = new Random();
      int i = ran.nextInt(199);
  
      return i;
  }
  
  public int ran2() {
      Random ran = new Random();
      int i = ran.nextInt(49);
  
      return i;
  }
  
  public void initData() {
      lc.setExtraOffsets(12,50,24,0); //padding
      setDescription("two lines example");
      lc.animateXY(500, 0);
      setLegend();
      setYAxis();
      setXAxis();
      setChartData();
  }
  
  public void setLegend() {
      Legend legend = lc.getLegend();
      legend.setForm(Legend.LegendForm.LINE);
      legend.setFormSize(20);
      legend.setTextSize(20f);
      legend.setFormLineWidth(1);
      legend.setHorizontalAlignment(Legend.LegendHorizontalAlignment.CENTER);
      legend.setTextColor(Color.BLACK);
  }
  
  public void setDescription(String descriptionStr) {
      Description description = new Description();
      description.setText(descriptionStr);
      WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
      DisplayMetrics outMetrics = new DisplayMetrics();
      wm.getDefaultDisplay().getMetrics(outMetrics);
      Paint paint = new Paint();
      paint.setTextSize(20);
      float x = outMetrics.widthPixels - Utils.convertDpToPixel(12);
      float y =  Utils.calcTextHeight(paint, descriptionStr) + Utils.convertDpToPixel(12);
      description.setPosition(x, y);
      lc.setDescription(description);
  }
  
  public void setYAxis() {
      final YAxis yAxisLeft = lc.getAxisLeft();
      yAxisLeft.setAxisMaximum(200);
      yAxisLeft.setAxisMinimum(0);
      yAxisLeft.setGranularity(10);
      yAxisLeft.setTextSize(12f);
      yAxisLeft.setTextColor(Color.BLACK);
      yAxisLeft.setValueFormatter(new IAxisValueFormatter() {
          @Override
          public String getFormattedValue(float value, AxisBase axis) {
              return value == yAxisLeft.getAxisMinimum() ? (int) value + "" : (int) value +"";
          }
      });
      lc.getAxisRight().setEnabled(false);
  }
  
  public void setXAxis() {
      XAxis xAxis = lc.getXAxis();
      xAxis.setPosition(XAxis.XAxisPosition.BOTTOM);
      xAxis.setDrawGridLines(false);
      xAxis.setLabelCount(20);
      xAxis.setTextColor(Color.BLACK);
      xAxis.setTextSize(12f);
      xAxis.setGranularity(1);
      xAxis.setAxisMinimum(0);
      xAxis.setAxisMaximum(100);
  
      xAxis.setValueFormatter(new IAxisValueFormatter() {
          @Override
          public String getFormattedValue(float value, AxisBase axis) {
              return value == 0 ? "example" : (int) value + "";
          }
      });
  }
  
  public void setChartData() {
  
      List<Entry> yVals1 = new ArrayList<>();
  
      for (int i = 0; i < 100; i++) {
          int j = ran();
          yVals1.add(new Entry(1 + i,j));
      }
  
      List<Entry> yVals2 = new ArrayList<>();
  
      for (int i = 0; i < 100; i++) {
          int j = ran2();
          yVals2.add(new Entry(1 + i,j));
      }
  
      LineDataSet lineDataSet1 = new LineDataSet(yVals1, "ex1");
      lineDataSet1.setValueTextSize(20);
      lineDataSet1.setDrawCircleHole(true);
      lineDataSet1.setColor(Color.MAGENTA);
      lineDataSet1.setMode(LineDataSet.Mode.LINEAR);
      lineDataSet1.setDrawCircles(true);
      lineDataSet1.setCubicIntensity(0.15f);
      lineDataSet1.setCircleColor(Color.MAGENTA);
      lineDataSet1.setLineWidth(1);
  
      LineDataSet lineDataSet2 = new LineDataSet(yVals2, "ex2");
      lineDataSet2.setValueTextSize(20);
      lineDataSet2.setDrawCircleHole(true);
      lineDataSet2.setColor(Color.BLUE);
      lineDataSet2.setMode(LineDataSet.Mode.LINEAR);
      lineDataSet2.setDrawCircles(true);
      lineDataSet2.setCubicIntensity(0.15f);
      lineDataSet2.setCircleColor(Color.BLUE);
      lineDataSet2.setLineWidth(1);
  
      .
      .
      .
  
      ArrayList<ILineDataSet> dataSets = new ArrayList<ILineDataSet>();
  
      dataSets.add(lineDataSet1);
      dataSets.add(lineDataSet2);
  
      LineData lineData = new LineData(dataSets);
  
      lc.setVisibleXRangeMaximum(5);
      lc.setScaleXEnabled(true);
      lc.setData(lineData);
  }
  

  并且喜欢这个 .

  

  回复于 2024-04-21T00:10:43+08:00