How to create array of a specific view and add each of them to main layout in Android

Question

I am able to run following code without any issue

EditText[] course_name = new EditText[4];
OnCreate {
        ConstraintLayout layout = findViewById(R.id.layout_setupclass);
        course_name[0] = new EditText(this);
        course_name[0] = (EditText) LayoutInflater.from(this).inflate(R.layout.edittext, null);
        layout.addView(course_name[0]);
}

But app would crash when I try this

EditText[] course_name = new EditText[4];
OnCreate {
        ConstraintLayout layout = findViewById(R.id.layout_setupclass);
        for(int i=0; i<5; i++)
        {
            course_name[i] = new EditText(this);
            course_name[i] = (EditText) LayoutInflater.from(this).inflate(R.layout.edittext, null);
            layout.addView(course_name[i]);
        }
}

snachmsm · Accepted Answer · 2021-06-14 06:02:08Z

1

you are creating array with 4 elements capacity new EditText[4];, but in your iteration you have 5 in-for-loop calls (i=0 to 4). index 4 doesn't exists in array (arrays are 0-based indexed), so you are getting ArrayIndexOutOfBoundsException on course_name[i] call (when i=4, as max may be 3 due to size of array)

btw. calling course_name[i] = new EditText(this); is redundant, as in very next line you are attaching another (inflated from XML) view to this variable

edited Jun 14, 2021 at 6:02

answered Jun 14, 2021 at 5:57

snachmsm

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2 Comments

ohmfischer Over a year ago

Jeez that's so silly of me; spent almost half an hour over this! Thanks for pointing that out.

snachmsm Over a year ago

happens :) btw. post exception stactrace in comments, you can find it in Logcat tab in Android Studio. I bet this exception name would lead you to resolution without posting question here :) consider upvoting/accepting answer if helpful, good luck!

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