在折线图中选择圆形颜色

Question

我正在使用MPAndroidChart，我有一个问题：

如何更改用户点击的圆圈颜色？

以下是我目前在OnChartValueSelectedListener：

中的内容

lineChart.setOnChartValueSelectedListener(new OnChartValueSelectedListener() {
        @Override
        public void onValueSelected(Entry entry, int i, Highlight highlight) {
            LocalBroadcastManager manager = LocalBroadcastManager.getInstance(getContext());
            Intent intent = new Intent(NewMainActivity.DIARY_ACTION);
            intent.putExtra("date", points.get(highlight.getXIndex()).getDate());
            manager.sendBroadcast(intent);
  ////////////////Here I want to change the color//////////////
        }

        @Override
        public void onNothingSelected() {

        }
    });

Answer 1

我找到的答案是提取一个名为myHighlight的类字段，并在监听器中更新它，如下所示：

lineChart.setOnChartValueSelectedListener(new OnChartValueSelectedListener() {
        @Override
        public void onValueSelected(Entry entry, int i, Highlight highlight) {
            LocalBroadcastManager manager = LocalBroadcastManager.getInstance(getContext());
            Intent intent = new Intent(NewMainActivity.DIARY_ACTION);
            intent.putExtra("date", points.get(highlight.getXIndex()).getDate());
            manager.sendBroadcast(intent);
            myHighlight = highlight.getXIndex();
            valuesCount = new int[lineChart.getValueCount()];
            setClickedPointGraphColor(valuesCount, clickedGraphPointColor);
        }

        @Override
        public void onNothingSelected() {

        }
    });

然后我写了一个方法setClickedPointGraphColor()，我在其中设置圆圈的颜色以匹配myHighlight的状态：

public void setClickedPointGraphColor(int[] valuesCount, int color) {
    for (int i =0; i < valuesCount.length; i++){
        if (i == myHighlight){
            valuesCount[i] = color;
        } else {
            valuesCount[i] = regularGraphPointColor;
        }
    }
}

由于我现在更新了数据集，因此我需要调用notifyDataSetChanged()。