How to set data from array list to another array

Question

i'm working in Android Application, i'm looking how to display results from array list after for loop, i want to set every value (heure, minute ...) in another list view after the function of conversion (BCD to Integer) that i'm worked with. thank you for your help!!

Integer[] array = {heure, minute, seconde, jour, mois, year};
    ArrayList<Integer> list = new ArrayList<>();
    /*Collections.addAll(list, array);*/
    for (int value : list) {
        temp = value;
        temp >>= 4;
        result = temp * 10;
        temp = value & 0b00001111;
        result += temp;
        this.total= result;
        list.add(this.total);
    }
    tvGetdata.setText(list.toString());

Can you be more specific what your actual question is or where you are stuck? — user6073886
– user6073886, Commented Feb 28, 2017 at 14:11
i want to display every value converted in another arraylist — D.G
– D.G, Commented Feb 28, 2017 at 14:16

Maycon Miranda · Accepted Answer · 2017-03-01 20:17:25Z

1

You're using a foreach on a empty list. So your code will just ignore it. Try do your for using your array.

Integer[] array = {heure, minute, seconde, jour, mois, year};
ArrayList<Integer> list = new ArrayList<>();
for (int value : array) {
    temp = value;
    temp >>= 4;
    result = temp * 10;
    temp = value & 0b00001111;
    result += temp;
    this.total= result;
    list.add(this.total);
}
tvGetdata.setText(list.toString());

answered Mar 1, 2017 at 20:17

Maycon Miranda

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Comments

Izruo · Accepted Answer · 2017-02-28 14:30:54Z

0

You kind of misused the two data structures here.

an Array is a fixed length list of items
- use it whenever you have a fixed set of values you want to process
a List is a list of items that will (at least in standard implementations) always try to adapt its capacatiy to the number of items
- use it whenever you need something more dynamic than an Array

So, in conclusion you will get a better outcome by switching the usage of these to structures (you'll se why below).

// we exactly know our initial input, so we can use an Array here
Integer[] array = {heure, minute, seconde, jour, mois, year};

// we don't know how many items will go in here, so we use a List for now
ArrayList<Integer> list = new ArrayList<>();

// you can loop over an Array just as over a List
for (int value : array) {
    // TODO do your calculations and save them in this.result

    // the ArrayList provides this neat utility to add an element
    // it will automatically increase its capacity, if required
    list.add(this.result);
}
tvGetdata.setText(list.toString());

Of course you can replace the array variable with another List and set the elements from a List to a List. The basic construct is just the same.

edited Feb 28, 2017 at 14:30

answered Feb 28, 2017 at 14:24

Izruo

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6 Comments

D.G Over a year ago

thank u but it display empty list, no value was inserted !

D.G Over a year ago

it display always the last data ( year) and not the 6 together

Izruo Over a year ago

No idea what could be wrong, it works for me. Could you please show how you implemented my example, e.g. by editing your question?

Izruo Over a year ago

@D.G You are looping over the empty List, not over the populated Array.

D.G Over a year ago

@Izuro sorry i didn't understand what do you mean :/

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