这个问题已经在这里有了答案：????????????>????????????How to check if activity is in foreground or in visible background?????????????????????????????????????22个

这是我用于使用MPAndroid库版本3的组bar_chart的代码.此代码不起作用.没有崩溃和错误日志,仍在加载图形,并且没有数据显示.帮我找出毛病

List entriesGroup1 = new ArrayList<>();

List entriesGroup2 = new ArrayList<>();

List entriesGroup3 = new ArrayList<>();

entriesGroup1.add(new BarEntry(0, 8f));

entriesGroup1.add(new BarEntry(1, 2f));

entriesGroup1.add(new BarEntry(2, 5f));

entriesGroup1.add(new BarEntry(3, 20f));

entriesGroup1.add(new BarEntry(4, 15f));

entriesGroup1.add(new BarEntry(5, 19f));

entriesGroup2.add(new BarEntry(0, 6f));

entriesGroup2.add(new BarEntry(1, 10f));

entriesGroup2.add(new BarEntry(2, 5f));

entriesGroup2.add(new BarEntry(3, 25f));

entriesGroup2.add(new BarEntry(4, 4f));

entriesGroup2.add(new BarEntry(5, 17f));

entriesGroup3.add(new BarEntry(0, 9f));

entriesGroup3.add(new BarEntry(1, 1f));

entriesGroup3.add(new BarEntry(2, 15f));

entriesGroup3.add(new BarEntry(3, 13f));

entriesGroup3.add(new BarEntry(4, 40f));

entriesGroup3.add(new BarEntry(5, 25f));

BarDataSet set1 = new BarDataSet(entriesGroup1, "Group 1");

BarDataSet set2 = new BarDataSet(entriesGroup2, "Group 2");

BarDataSet set3 = new BarDataSet(entriesGroup3, "Group 3");

final ArrayList labels = new ArrayList();

labels.add("2016");

labels.add("2015");

labels.add("2014");

labels.add("2013");

labels.add("2012");

labels.add("2011");

IAxisValueFormatter formatter = new IAxisValueFormatter() {

@Override

public String getFormattedValue(float value, AxisBase axis) {

if((int) value < 0 || (int) value >= labels.size()){

return "";

}else{

return labels.get((int) value);

}

}

// we don't draw numbers, so no decimal digits needed

@Override

public int getDecimalDigits() { return 0; }

};

set1.setColor(Color.parseColor("#cd5080"));

set2.setColor(Color.parseColor("#0d5080"));

set3.setColor(Color.parseColor("#fc5080"));;

float groupSpace = 0.06f;

float barSpace = 0.02f; // x2 dataset

float barWidth = 0.45f; // x2 dataset

// (0.02 + 0.45) * 2 + 0.06 = 1.00 -> interval per "group"

XAxis xAxis = barChart.getXAxis();

xAxis.setCenterAxisLabels(true);

xAxis.setGranularity(1f); // minimum axis-step (interval) is 1

xAxis.setValueFormatter(formatter);

BarData data = new BarData(set1, set2, set3);

data.setBarWidth(barWidth); // set the width of each bar

barChart.setData(data);

barChart.groupBars(2016, groupSpace, barSpace);

barChart.invalidate(); // refresh

barChart.animateY(5000);

Nb：因为我被禁止提出新问题,所以我已经编辑了当前的问题.但这对我很重要.感谢大家.