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-array? — Kevin Cruijssen
– Kevin Cruijssen, Commented Nov 27, 2015 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
– Syed Qasim Ahmed, Commented Nov 27, 2015 at 14:01
Or using this method where you can say String spinnerId = "spinner_grade_" + i; — AuroMetal
– AuroMetal, Commented Nov 27, 2015 at 14:03

Syed Qasim Ahmed · Accepted Answer · 2015-11-27 14:12:23Z

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, 2015 at 14:12

Syed Qasim Ahmed

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1 Comment

Sasith Priyankara Over a year ago

Thank you very much. I got it.

Marcin Bortel · Accepted Answer · 2015-11-27 14:28:07Z

1

use Butterknife library:

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

answered Nov 27, 2015 at 14:28

Marcin Bortel

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