android - 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..

Answer 1

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.