I wonder how it is itself being the crime object under click?

Android Programming (3rd Edition) 10. Using Fragment Arguments
1

2018-01-09
2018-01-09.png1920×1080 249 KB

The program in chap.10 runs great but I do not understand why under click event, mCrime.getId() can realize which crime object it is. Unlike the other 3 fields which is initialized by the itemView attribute inside constructor, mCrime has no initialized at all. I wonder how it is itself being the crime object under click?

2

Here is the magical part.

    private class CrimeAdapter extends RecyclerView.Adapter<CrimeHolder> {

        private List<Crime> mCrimes;

        public CrimeAdapter(List<Crime> crimes) {
            mCrimes = crimes;
        }

        //......

        @Override
        public void onBindViewHolder(CrimeHolder holder, int position) {
            Crime crime = mCrimes.get(position);
            holder.bindCrime(crime);
        }

        //......
    }
    private abstract class CrimeHolder extends RecyclerView.ViewHolder {

        protected Crime mCrime;

        //......

        public void bindCrime(Crime crime) {
            mCrime = crime;
            //......
        }
    }
3

This is exactly what I am asking. It is a great help to my study.

Thank you very much.