java.lang.ClassCastException: com.github.mikephil.charting.data.Entry cannot be cast to com.github.mikephil.charting.data.PieEntry

Question

Accepting data from database and displaying it on Table Layout and using that data creating a piechart with MpAndroidChart Library but getting the error as stated above

I am transfering arraylist from one activity to other using putextra and getSerializableExtra while accepting "the error is shown as above"

I am sharing my code please help

yValue is my arraylist where data is stored

transfering it to mylist using intent but this is generating error

My code:-

public class DisplayDate extends MainActivity{


    public ArrayList<PieEntry> yValues = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.display_date);

        doInBackground();

        pieChart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent pieIntent = new Intent(DisplayDate.this,DisplayPiechart.class);
                pieIntent.putExtra("Pie Values",yValues);
                startActivity(pieIntent);
            }
        });
    }

    public void doInBackground()
    {
        ConnectionHelper connectString = new ConnectionHelper();
        connect = connectString.connectionClass();

        Log.w("Android","Connecting....");

        if (connect == null)
        {
            Log.w("Android","Connection Failed");
            ConnectionResult = "Check Your Internet Connection";
        }
        else
        {
            Log.w("Android","Connected");
            String query = "Select No_,Name,Date,[Net Amount],[Gross Amount] from [CRONUS LS 1010 W1 Demo$Store] as str,[CRONUS LS 1010 W1 Demo$Transaction Header] as trans where str.[No_] = trans.[Store No_] and trans.[Date] between '"+Actual_Start+"' and '"+Actual_End+"' ";
            try
            {
                Statement stmt = connect.createStatement();
                ResultSet rs = stmt.executeQuery(query);

                Log.w("Android","database Connected");

                while (rs.next()) {

                    TR = new TableRow(this);

                    TV1.setText(rs.getString("No_"));
                    TV2.setText(rs.getString("Name"));
                    TV4.setText(rs.getString("Date"));
                    TV5.setText(rs.getString("Net Amount"));
                    TV3.setText(rs.getString("Gross Amount"));

                    TL.addView(TR);

                    c = TV3.getText().toString();
                    a = Float.parseFloat(c);
                    d = TV1.getText().toString();

                    yValues.add(new PieEntry(a,d));
                }

                ConnectionResult = "Successful";
                isSuccess = true;
                connect.close();
            }
            catch (SQLException e)
            {
                e.printStackTrace();
            }
        }
    }
}

class DisplayPiechart extends DisplayDate{

    com.github.mikephil.charting.charts.PieChart pieChart;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.display_piechart);

        Intent i = getIntent();

        ArrayList<PieEntry> myList = (ArrayList<PieEntry>) i.getSerializableExtra("Pie Values");


        //Error at below line    
           PieDataSet dataSet = new PieDataSet(myList, "Stores");


        dataSet.setSliceSpace(2f);
        dataSet.setSelectionShift(6f);
        dataSet.setColors(ColorTemplate.MATERIAL_COLORS);

        PieData data = new PieData(dataSet);
        data.setValueTextSize(10f);
        data.setValueTextColor(Color.BLACK);

        pieChart.setData(data);
    }
} 

Answer 1

This is a very old question but was running into the same issue. I'm new at this so take it with a grain of salt. There is probably a better way of solving it but posting it in case it helps someone.

I solved it by creating an ArrayList in the receiving activity as such:

ArrayList<Entry> receivedData;
receivedData = new ArrayList<>();

Then stored the data passed from the first activity into this ArrayList:

receivedData = getIntent().getParcelableArrayListExtra("data");

// Get size of ArrayList
int size = receivedData.size();

// Getting individual X and Y values from each ArrayList element    
for(int k = 0; k < size; k++){

     // Adding X and Y values as entries in a different
     // ArrayList barEntriesArrayList
     addDataPointsToGraph((int) receivedData.get(k).getX(), receivedData.get(k).getY());
}

And here is that Method:

private void addDataPointsToGraph(int x, float y){
    barEntriesArrayList.add(new BarEntry(x, y));
}

I then supplied this ArrayList barEntriesArrayList to the dataSet

// creating a new bar data set.
barDataSet2 = new BarDataSet(barEntriesArrayList, getResources().getString(R.string.valuePerDay));

I was using these two tutorials as a guide when generating my graph

https://www.geeksforgeeks.org/how-to-create-a-barchart-in-android/

https://learntodroid.com/how-to-display-a-bar-chart-in-your-android-app/