MPAndroidChart未更新

我有这样的哈希映射

LinkedHashMap hash = new LinkedHashMap<>();
hash.put("2015-05-03", 100);
hash.put("2015-05-04", 110);
hash.put("2015-05-05", 90);
hash.put("2015-05-06", 40);

我想通过MPAndroidChart设计一个LineChart,但它不工作,图表无效,没有任何显示!似乎我的代码无效.
这是我的代码:

private void setChartData(LinkedHashMap lastMonthMediaLikes)
    {

        ArrayList xVals = new ArrayList<>();

        for(Map.Entry entry : lastMonthMediaLikes.entrySet())
        {
            xVals.add(entry.getKey());
        }



        ArrayList vals1 = new ArrayList<>();
        int i = 0;
        for(Map.Entry entry : lastMonthMediaLikes.entrySet())
        {
            vals1.add(new Entry(Float.valueOf(entry.getValue()), i));
            i++;
        }

        // create a dataset and give it a type
        LineDataSet set1 = new LineDataSet(vals1, "DataSet 1");
        set1.setDrawCubic(true);
        set1.setCubicIntensity(0.2f);
        //set1.setDrawFilled(true);
        set1.setDrawCircles(false);
        set1.setLineWidth(1.8f);
        set1.setCircleSize(4f);
        set1.setCircleColor(Color.WHITE);
        set1.setHighLightColor(Color.rgb(244, 117, 117));
        set1.setColor(Color.WHITE);
        set1.setFillColor(Color.WHITE);
        set1.setFillAlpha(100);
        set1.setDrawHorizontalHighlightIndicator(false);
        set1.setFillFormatter(new FillFormatter()
        {
            @Override
            public float getFillLinePosition(LineDataSet dataSet, LineDataProvider dataProvider)
            {
                return -10;
            }
        });

        // create a data object with the datasets
        LineData data = new LineData(xVals, set1);
        //data.setValueTypeface(tf);
        data.setValueTextSize(9f);
        data.setDrawValues(false);

        // set data
        chart.setData(data);
    }

请指教,我该怎么办？

你是通过设置数据setData(...),但你没有刷新的View调用invalidate().

这应该做的工作:

LineChart chart = ...;

chart.setData(...); // set data
chart.invalidate(); // refresh after setting data