How to create multiple objects using for loop and array

Question

I'm new to android and creating an app that have 30 spinners that share same content. How can I create these objects inside a loop without writing 30 lines ?

Spinner spinner_grade_1 = (Spinner) findViewById(R.id.spinner_grade_1);
Spinner spinner_grade_2 = (Spinner) findViewById(R.id.spinner_grade_2);
......
Spinner spinner_grade_30 = (Spinner) findViewById(R.id.spinner_grade_20);

instead of that how can I create these objects inside a loop ? (I have created the following string array)

gradeBoxNames = new String[]{"spinner_grade_1", "spinner_grade_2",..... };

Why a `String`-array? Isn't it easier to create an [`android.R.id`](http://developer.android.com/reference/android/R.id.html)-array? — Kevin Cruijssen, Nov 27 '15 at 13:58
you can make `Spinner[] array;` and make another array of int ids like `int[] arr ={R.id.spinner_grade_1};` Now you can loop through these values like `array[i] = findviewbyid(arr[i])` — Syed Qasim Ahmed, Nov 27 '15 at 14:01
Or using [this method](http://stackoverflow.com/a/10626635) where you can say `String spinnerId = "spinner_grade_" + i;` — AuroMetal, Nov 27 '15 at 14:03

score 2 · Accepted Answer · answered Nov 27 '15 at 14:12

2

1) Initialize array of Resource ids

 int[] ids = {R.id.spinner_grade_1,R.id.spinner_grade_2};
        Spinner[] spinners = new Spinner[ids.length];


    for(int i=0 ;i< ids.length;i++) {
               spinners[i] = (Spinner) findViewById(ids[i]);
            }

answered Nov 27 '15 at 14:12

Syed Qasim Ahmed

1,352
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24

Thank you very much. I got it. – Sasith Priyankara Nov 27 '15 at 16:13

score 1 · Answer 2 · answered Nov 27 '15 at 14:28

1

use Butterknife library:

@Bind({ R.id.first_name, R.id.middle_name, R.id.last_name })
List<EditText> nameViews;

answered Nov 27 '15 at 14:28

Marcin Bortel

1,190
2
14
28

How to create multiple objects using for loop and array

2 Answers2