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app/src/main/java/com/example/ninefourone/nutritionmaster/utils/ChartDrawer.java

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+package com.example.ninefourone.nutritionmaster.utils;
+
+import android.content.Context;
+
+import com.example.ninefourone.nutritionmaster.R;
+import com.github.mikephil.charting.charts.LineChart;
+import com.github.mikephil.charting.data.Entry;
+import com.github.mikephil.charting.data.LineData;
+import com.github.mikephil.charting.data.LineDataSet;
+import com.github.mikephil.charting.interfaces.datasets.ILineDataSet;
+
+import java.util.ArrayList;
+
+/**
+ * Created by ScorpioMiku on 2018/8/30.
+ */
+
+public class ChartDrawer {
+
+    /**
+     * 创建一条折线
+     * @param index
+     * @param datas
+     * @param linename
+     * @return
+     */
+    public LineData initSingleLineChart(String[] index, float[] datas, String linename) {
+        if (index.length != datas.length) {
+            MessageUtils.MakeToast("index长度与datas长度不符");
+            return null;
+        } else {
+            ArrayList<String> xValues = new ArrayList<>();
+            for (int i = 0; i < datas.length; i++) {
+                xValues.add(index[i] + "");
+            }
+            ArrayList<Entry> yValues = new ArrayList<>();
+            for (int i = 0; i < datas.length; i++) {
+                yValues.add(new Entry(datas[i], i));
+            }
+            LineDataSet dataSet = new LineDataSet(yValues, linename);
+            dataSet.setLineWidth(1.75f);
+            dataSet.setColor(R.color.colorPrimary);
+
+            ArrayList<ILineDataSet> dataSetArrayList = new ArrayList<>();
+            dataSetArrayList.add(dataSet);
+
+            LineData lineData = new LineData(dataSetArrayList);
+            return lineData;
+        }
+    }
+}