How to set images id dynamically in integer array

Question

Here is my code, I have 100 images and i want to create it dynamic using loop but it's not working.

   int[] imgIds = {R.drawable.img1, R.drawable.img2, R.drawable.img3};

What is the problem that you are facing? What is not working? Your question states a loop but there is no loop in the code snippet that you posted — Antrromet
– Antrromet, Commented Apr 7, 2014 at 9:36
What problem you are facing ? also share code which you have tried — ρяσѕρєя K
– ρяσѕρєя K, Commented Apr 7, 2014 at 9:37
I am just asking how to create it dynamically.this is just simple and i don't want to write 100 images name in array. — SourabhTech
– SourabhTech, Commented Apr 7, 2014 at 9:39

ρяσѕρєя K · Accepted Answer · 2014-04-07 09:45:08Z

1

Try using getResources().getIdentifier to create array of drawable id's if drawables name is as img1,img2,img3,..

int[] imgIds = new int [100];
int imagecount=1;
for(int i=0;i<100;i++){
imgIds[i]=getResources().getIdentifier("img"+imagecount,
                                           "drawable", getPackageName());
imagecount++;
}

answered Apr 7, 2014 at 9:45

ρяσѕρєя K

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Comments

Blackbelt · Accepted Answer · 2014-04-07 09:40:02Z

1

if your images are all called with the same prefix and the only thing it does change is the number you can do the following thing:

Suppose you numbered from 0 to size -1

ArrayList<Integer> imgIds = new ArrayList<Integer>();
for (int i = 0; i < size; i++) {
  imgIds.add(getResources().getIdentifier("img"+i, "drawable", getPackageName());
}

check for typo. Edit. With array:

int[] imgIds = new int[size];
for (int i = 0; i < size; i++) {
  imgIds[i] = getResources().getIdentifier("img"+i, "drawable", getPackageName();
}

answered Apr 7, 2014 at 9:40

Blackbelt

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3 Comments

SourabhTech Over a year ago

I want to implement it using array not array list.

SourabhTech Over a year ago

When I am trying to put your code but it gives error "null pointer" public class ImageAdapter extends BaseAdapter { int mGalleryItemBackground; private Context mContext; ArrayList<Integer> mImageIds = new ArrayList<Integer>(); for (int i = 0; i < size; i++) {mImageIds.add(getResources().getIdentifier("img"+i, "drawable", getPackageName()); } }

Blackbelt Over a year ago

where do you get the NPE? post the stacktrace

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