Android Studio Linechart, String as xAxis

I made an Android application that gets the data from Firebase which I managed to do, I made the linedataset but my xAxis should be Strings (dates), my yAxis is float. I managed to do the yAxis and the xAxis (but it only shows the days, and I want it to show the whole date). This is my code so far:

for (DataSnapshot snapshot1 : snapshot.getChildren()){
                        String data = snapshot1.getKey(); //This is the date that I want to show
                        String[] values = data.split("-");
                        int day = Integer.parseInt(values[2]);
                        int month = Integer.parseInt(values[1]);
                        int year = Integer.parseInt(values[0]);
                        int int1 = (int) (snapshot1.getChildrenCount() - 1);
                        arraylist.add(new Entry(day, int1));     
                }
                LineDataSet lineDataSet = new LineDataSet(arraylist, "something");
                ArrayList<ILineDataSet> iLineDataSets = new ArrayList<>();
                iLineDataSets.add(lineDataSet);

                LineData lineData = new LineData(iLineDataSets);
                lineChart.setData(lineData);
                lineChart.invalidate();

EDIT: I made some research and now I know that I should use lineChart.getXAxis().setValueFormatter(new IndexAxisValueFormatter(dates)); But this shows nothing, dates is an arraylist and there are three values in it. I am sure of it because if I toast the values it shows the three values.