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Why ArrayList is always same value in only Adapter?

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This is the worst bug I have ever seen.. I was fetching CallLogs following way.

ArrayList<HashMap<String, String>> callLog= new ArrayList<>();
        HashMap<String, String> data = new HashMap<>();
        Cursor c = activity.getContentResolver().query(CallLog.Calls.CONTENT_URI, null, null, null, CallLog.Calls.DATE + " DESC ");
        String phoneNumber,type,date,duration,name;

        while(c.moveToNext()){
            phoneNumber = c.getString(c.getColumnIndex(CallLog.Calls.NUMBER));
            type = c.getString(c.getColumnIndex(CallLog.Calls.TYPE));
            date = c.getString(c.getColumnIndex(CallLog.Calls.DATE));
            duration = c.getString(c.getColumnIndex(CallLog.Calls.DURATION));
            name = c.getString(c.getColumnIndex(CallLog.Calls.CACHED_NAME));

            data.put(Constants.PHONE_NUMBER, phoneNumber);
            data.put(Constants.NAME, name);
            data.put(Constants.DATE, date);
            data.put(Constants.TYPE, type);
            data.put(Constants.DURATION, duration);

            callLog.add(data);
        }
        c.close();
        return callLog;

I was trying to set it to Adapter. Here how I had linked them to adapter

ContactViewAdapter contactViewAdapter = new ContactViewAdapter(getActivity(),getActivity(),CallLog(getActivity()),"contact");
        recyclerViewCallLog.setAdapter(contactViewAdapter);

Since Adapter class is little bit bigger hence I am not adding all context. I am just adding constructor here.

public class ContactViewAdapter extends RecyclerView.Adapter<ContactViewAdapter.MyViewHolder> {

Context context;
    ArrayList<HashMap<String, String>> list;
    String type;
    Activity activity;

    public ContactViewAdapter(Activity activity,Context context, ArrayList<HashMap<String,String>> list,String type){
        this.activity = activity;
        this.context = context;
        this.list = list;
        this.type = type;
    }

This is understandable for an Android App developer. The bug is listed below :

I am actually using multiple RecyclerView using the Adapter. Their layout is closely same that's why I chose to use single Adapter that could decrease amount of source code. It was working fine for Contacts. But the bug is available in CallLog.
The method can return all call logs. In DialerFragment (where I am calling that method), I can see all CallLog either. When the list gets to Adapter then only single CallLog is returning.

I am removing phoneNumber from Logcat list.

[{date=123123, name=null, phoneNumber=+4365643, duration=45, type=1}, {date=43743, name=null, phoneNumber=+4543, duration=45, type=1}, {date=23452, name=null, phoneNumber=+3245432, duration=45, type=1}, {date=234523, name=null, phoneNumber=+3245432, duration=45, type=1}, {date=1617550988892, name=null, phoneNumber=+2345, duration=45, type=1}, {date=1617550923452388892, name=null, phoneNumber=+88018115723457032, duration=45, type=1}, {date=16175502345988892, name=null, phoneNumber=+88018234511577032, duration=45, type=1}, {date=16175509888234592, name=null, phoneNumber=+88018112345577032, duration=45, type=1}, {date=16172345550988892, name=null, phoneNumber=+88018112345577032, duration=45, type=1}, {date=16175234550988892, name=null, phoneNumber=+88018234511571237032, duration=45, type=1}

The logcat is from the method. I get the same log in fragment (activity) page either. Logcat in Adapter.

2021-09-19 14:00:07.995 20558-20558/com.contact D/LOGCAT: {date=1617550988892, name=null, phoneNumber=+88018115747032, duration=45, type=1}
2021-09-19 14:00:08.012 20558-20558/com.contact D/LOGCAT: {date=1617550988892, name=null, phoneNumber=+88018115747032, duration=45, type=1}
2021-09-19 14:00:08.026 20558-20558/com.contact D/LOGCAT: {date=1617550988892, name=null, phoneNumber=+88018115747032, duration=45, type=1}
2021-09-19 14:00:08.040 20558-20558/com.contact D/LOGCAT: {date=1617550988892, name=null, phoneNumber=+88018115747032, duration=45, type=1}
2021-09-19 14:00:08.054 20558-20558/com.contact D/LOGCAT: {date=1617550988892, name=null, phoneNumber=+88018115747032, duration=45, type=1}
2021-09-19 14:00:08.068 20558-20558/com.contact D/LOGCAT: {date=1617550988892, name=null, phoneNumber=+88018115747032, duration=45, type=1}
2021-09-19 14:00:08.082 20558-20558/com.contact D/LOGCAT: {date=1617550988892, name=null, phoneNumber=+88018115747032, duration=45, type=1}
2021-09-19 14:00:08.098 20558-20558/com.contact D/LOGCAT: {date=1617550988892, name=null, phoneNumber=+88018115747032, duration=45, type=1}
2021-09-19 14:00:08.112 20558-20558/com.contact D/LOGCAT: {date=1617550988892, name=null, phoneNumber=+88018115747032, duration=45, type=1}
2021-09-19 14:00:08.126 20558-20558/com.contact D/LOGCAT: {date=1617550988892, name=null, phoneNumber=+88018115747032, duration=45, type=1}
2021-09-19 14:00:08.140 20558-20558/com.contact D/LOGCAT: {date=1617550988892, name=null, phoneNumber=+88018115747032, duration=45, type=1}
2021-09-19 14:00:08.154 20558-20558/com.contact D/LOGCAT: {date=1617550988892, name=null, phoneNumber=+88018115747032, duration=45, type=1}

don't care of DATE. They are in correct format. They are in miliseconds. don't care of number either. I have added a number (character) in those numbers. Here how I have called it.

@Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
        String phoneNumber = list.get(position).get(Constants.PHONE_NUMBER);
        String name = list.get(position).get(Constants.NAME);
        Bitmap imgBitmap = null;
        String photo = null;

        Log.d("LOGCAT", String.valueOf(list.get(position)));
}

But why they are returning same value each time?

java android arraylist

posted over 2 years ago

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Anonymous‭

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Worked for Anonymous‭

The following users marked this post as Works for me:

User	Comment	Date
Anonymous‭	(no comment)	Oct 8, 2021 at 04:33

Each list index refers to the same HashMap which it just override the key's value with each iteration of your loop, losing any previously set values. So if I put the HashMap value inside loop then it works fine. So the code will look like

while(c.moveToNext()){
HashMap<String, String> data = new HashMap<>();
            phoneNumber = c.getString(c.getColumnIndex(CallLog.Calls.NUMBER));
            type = c.getString(c.getColumnIndex(CallLog.Calls.TYPE));
            date = c.getString(c.getColumnIndex(CallLog.Calls.DATE));
            duration = c.getString(c.getColumnIndex(CallLog.Calls.DURATION));
            name = c.getString(c.getColumnIndex(CallLog.Calls.CACHED_NAME));

            data.put(Constants.PHONE_NUMBER, phoneNumber);
            data.put(Constants.NAME, name);
            data.put(Constants.DATE, date);
            data.put(Constants.TYPE, type);
            data.put(Constants.DURATION, duration);

            callLog.add(data);
        }

posted over 2 years ago

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Anonymous‭

233 reputation 28 11 7 45

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Why ArrayList is always same value in only Adapter?

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