In my Activity, I use imageView.setImageResource(R.drawable.image_name); about 8 times for different views.
I kept opening and closing the activity repeatedly and I notice the app is getting laggy. I am wondering if this is related to memory leak? Is it because of that piece of code?
You should recycle() all your bitmaps when done using them. If you want to destroy them when activity is finish()ed, you can override onDestroy to destroy all bitmaps