android java insertsort using ArrayList

First of all, I'm writing program to visualize sorting algorithms on Android I wrote method for insertion sort algorithm. I'm using MPAndroidChart for it.

    void insertionSort(int[] arr) {
    int i, j, newValue;
    for (i = 1; i < arr.length; i++) {
        newValue = arr[i];
        j = i;
        while (j > 0 && arr[j - 1] > newValue) {
            arr[j] = arr[j - 1];
            j--;
        }
        arr[j] = newValue;
    }
}

...and it works fine. I want to redesign it to get the same result using ArrayList, but unfortunately, it crashes, and I have no idea why! This is my collection approach insertionSort:

void insertionSort(ArrayList<BarEntry> list) {
    int i, j;
    float newValue;
    for (i = 1; i < list.size(); i++) {
        newValue = list.get(i).getY();
        j = i;
        while (j > 0 && list.get(j-1).getY() > newValue) {
            list.set(j, list.get(j-1));
            j--;
        }
        BarEntry be = list.get(list.indexOf(newValue));
        list.set(j, be);
    }
}

BarEntry is class used to create charts. I want to sort my data by its Y coordinate, what I do by getY() function. Program shuts down there:

BarEntry be = list.get(list.indexOf(newValue)); list.set(j, be);

In a nutshell: How can I substitute

arr[j] = newValue;

to collection approach like this (not working):

list.set(j, list.get(list.indexOf(newValue)));