java - MPAndroid 图表 - 图表未更新

Question

我使用 Horizo​​ntal MPAndroid 图表显示收入/支出，该图表最适用。我可以更改显示的信息，尽管我只能在 OnViewCreated 中进行更改。如果我尝试从显示 fragment 的 Activity 中执行此操作，则什么也不会发生，我完全不知道为什么。虽然我不是 100% 确定我是否以正确的方式设置数据。

public class BudgetFragment extends Fragment{

private HorizontalBarChart mainChart;
private BarData data;
private BarDataSet dataset1;
private BarDataSet dataset2;

private int expenseSum = 0;
private int incomeSum = 0;

public MainActivityBudgetFragment(){

}

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    return inflater.inflate(R.layout.budget_fragment, container, false);
}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    mainChart = (HorizontalBarChart) view.findViewById(R.id.mainBudgetChart);

    ArrayList<BarEntry> entries1 = new ArrayList<>();
    ArrayList<BarEntry> entries2 = new ArrayList<>();

    entries1.add(new BarEntry(10000, 5));
    entries2.add(new BarEntry(10000, 5));

    dataset1 = new BarDataSet(entries1, "income");
    dataset2 = new BarDataSet(entries2, "expense");

    //X-axis labels
    ArrayList<String> xVals = new ArrayList<String>();
    xVals.add("income"); xVals.add("expense");

    ArrayList<BarDataSet> dataSets = new ArrayList<BarDataSet>();
    dataSets.add(dataset1);
    dataSets.add(dataset2);

    //Add to chart
    data = new BarData(xVals, dataSets);


    mainChart.setData(data);

    //Description and animation
    mainChart.setDescription("");  // set the description
    mainChart.setScaleYEnabled(false);
    mainChart.setTouchEnabled(false);
    mainChart.animateY(2000);

    setDataExpense(200);//(This works fine)
    setDataIncome(200); //(This works fine)
}

public void updateDataExpense(){
    Log.e("updateTag", "Updated expense");

    dataset2.removeEntry(1);
    data.addEntry(new BarEntry(expenseSum, 1), 1);
    dataset2.setColor(getResources().getColor(R.color.orange));
    mainChart.notifyDataSetChanged(); // let the chart know it's data changed
    mainChart.invalidate(); // refresh
}

public void updateDataIncome(){

    Log.e("updateTag", "Updated Income");
    dataset1.removeEntry(0);
    data.addEntry(new BarEntry(newIncome, 0), 0);
    dataset1.setColor(getResources().getColor(R.color.green));
    mainChart.notifyDataSetChanged(); // let the chart know it's data changed
    mainChart.invalidate(); // refresh
}

 //(These do not work when called outside OnViewCreated)
private void setDataExpense(int sum){
    expenseSum = (expenseSum + sum);
    Log.d("ResumeTag", "expense set at " + expenseSum);
    updateDataExpense();
}

private void setDataIncome(int sum){
    incomeSum = (incomeSum + sum);   
    Log.d("ResumeTag", "income set at " + incomeSum);
    updateDataIncome();
}

如果我忘记了什么重要的事情，请告诉我。我没有太多在 Stackoverflow 上提问的经验。

感谢您的帮助!//克里斯

Answer 1

请试试这个:

public void updateDataIncome() {
    Log.e("updateTag", "Updated Income");
    dataset1.removeEntry(0);
    data.addEntry(new BarEntry(newIncome, 0), 0);
    dataset1.setColor(getResources().getColor(R.color.green));

    data.notifyDataChanged(); // NOTIFIES THE DATA OBJECT

    mainChart.notifyDataSetChanged(); // let the chart know it's data changed
    mainChart.invalidate(); // refresh
}