dynamically getting all image resource id in an array

Question

there are many images in drawable foder so instead manually creating array of all image resource ids , i want to get all images dynamically of drawable folder in array. currently i m using this code:

for(int i=1;i<=9;i++)
    {
            int imageKey = getResources().getIdentifier("img"+i, "drawable", getPackageName());
            ImageView image = new ImageView(this);  
            image.setId(imgId);
            image.setImageResource(imageKey);    
            image.setScaleType(ImageView.ScaleType.FIT_XY);
            viewFlipper.addView(image, new LayoutParams(LayoutParams.FILL_PARENT,              LayoutParams.FILL_PARENT));
            imgId++;
        }

but in that code i need to manually edit the image name to get the resource id but i want to get all image with any name..

khiner · Accepted Answer · 2014-02-21 06:02:19Z

20

you can Use Reflection to achieve this.

import the Field class

import java.lang.reflect.Field;

and then write this in your code

Field[] ID_Fields = R.drawable.class.getFields();
int[] resArray = new int[ID_Fields.length];
for(int i = 0; i < ID_Fields.length; i++) {
    try {
        resArray[i] = ID_Fields[i].getInt(null);
    } catch (IllegalArgumentException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

resArray[] now holds references to all the drawables in your application.

edited Feb 21, 2014 at 6:02

khiner

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answered Sep 5, 2012 at 5:50

Vinay W

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4 Comments

Kailash Dabhi Over a year ago

thank you very much bro... its working now correctly but it also fetches the icon of application .. is dat any work around for it?

Vinay W Over a year ago

it simply gets all the drawable Ids which includes the icon. You are going to have to find out a way to exclude it in your logic(iterator/loop).

Vinay W Over a year ago

just exclude them when you traverse through the list

Ahmad Reza Enshaee Over a year ago

and with getName() you can get All resources property name. Thanks

Ratna Halder · Accepted Answer · 2018-06-06 16:27:17Z

8

Well, If your image names are img1, img2 and so on, then you can create a variable like

String url = "drawable/"+"img"+i;

int imageKey = getResources().getIdentifier(url, "drawable", getPackageName());

you can also replace your getPackageName() method by your package name like "com.android.resource"
Simply,the general function is

public int getIdentifier(String name, String defType, String defPackage)

edited Jun 6, 2018 at 16:27

answered Sep 5, 2012 at 5:44

Ratna Halder

2,00417 silver badges17 bronze badges

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