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Android Build a Self-Destructing Message Android App Sending Messages Selecting Recipients

Posted by evgeniylischuk
evgeniylischuk
5,265 Points

FindInBackground (Parse.com) doesn't work with fragments

Good afternoon. I've tried to modify Ribbit project to use fragments and faced the problem that method done() doesn't start at all when is called from fragment. (FindInBackground( new FindCallback<ParseUser>() { @Override public void done(List<ParseUser> list, ParseException e) {.....} And I had to use find() instead of findInBackground Could you, please, help me find the way to use exactly Callback because as I understood - it's not a good idea to work with queries in the UI thread.

TheBigoso /\
TheBigoso /\
3,217 Points

Can i see your code

evgeniylischuk
evgeniylischuk
5,265 Points

'''java queryParse.findInBackground(new FindCallback<ParseUser>() {

// @Override // public void done(List<ParseUser> list, ParseException e) {

// if (e == null) { // mFriends = list; //

// int i = 0; // mFriendsNames = new String[mFriends.size()]; // for (ParseUser user : mFriends) {

// mFriendsNames[i] = user.getUsername(); // i++; // // } // // } else { // Log.i("Friends.onResume", e.getMessage()); // AlertDialog.Builder builder = new AlertDialog.Builder(mContext); // builder.setTitle("Friends list error"); // builder.setMessage("An error: " + e.getMessage() + " has occured"); // builder.setPositiveButton("Ok", null); // AlertDialog dialog = builder.create(); // dialog.show(); // } // // } // // }); '''

evgeniylischuk
evgeniylischuk
5,265 Points

And when I run this code done() method never get called. I saw on stackflow one post that there is a problem exactly with calling FindInBackground() from fragments but no solution and it was date 2014year.

5 Answers

TheBigoso /\
TheBigoso /\
3,217 Points

Hi evgeniylischuk,

I made this video for you. This Video explains how to implement parse into an existing project. let me know if you need any help.

https://www.youtube.com/watch?v=KkvWHaIHFt0

TheBigOso

TheBigoso /\
TheBigoso /\
3,217 Points
TheBigoso /\
TheBigoso /\
3,217 Points

check this out you can make your code look nice by using this at the top tilda tilda tilda Java and this at the end tilda tilda tilda . every time i use the tilda thats above the tab button on your keyboard it rems it out.

queryParse.findInBackground(new FindCallback() {

@Override 
 public void done(List list, ParseException e) {

 if (e == null) { // mFriends = list; 

 int i = 0; // mFriendsNames = new String[mFriends.size()]; 
 for (ParseUser user : mFriends) {

 mFriendsNames[i] = user.getUsername(); 
             i++;
  }
 }

im also making a video for you that i will post.

thx

oso

evgeniylischuk
evgeniylischuk
5,265 Points
evgeniylischuk
evgeniylischuk
5,265 Points

Thank you very much. With tilda it really looks much better:))

queryParse.findInBackground(new FindCallback<ParseUser>() {
                int started = 1;

                @Override
                public void done(List<ParseUser> list, ParseException e) {
                    if (e == null) {
                        mFriends = list;
                        int i = 0;
                       mFriendsNames = new String[list.size()];
                        for (ParseUser user : mFriends) {
                            Log.i("Parse",user.getUsername() + " i = " + i);
                            mFriendsNames[i] = user.getUsername();
                            i++;

                        }
                    } else {
                        AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
                        builder.setTitle("Friends list error");
                        builder.setMessage("An error: " + e.getMessage() + " has occured");
                        builder.setPositiveButton("Ok", null);
                        AlertDialog dialog = builder.create();
                        dialog.show();
                    }
                }
            });
TheBigoso /\
TheBigoso /\
3,217 Points

Right on now Its much more readable

evgeniylischuk
evgeniylischuk
5,265 Points
evgeniylischuk
evgeniylischuk
5,265 Points

I watched your video. Thanks. Did I understood you right, that I should try to setup Parse connection as existing project instead of new one? Will it solve problem with findInBackground() in fragment?

TheBigoso /\
TheBigoso /\
3,217 Points
TheBigoso /\
TheBigoso /\
3,217 Points

Yeah how i went about it, wherever you put parse for the video, you can do the same thing to your existing project. But I don't know if it will fix your background problem. As i don't have the project in front of me. What i would do is use the project we just made with the sliding tabs. Then combine your old project with the new one. I would do this by re watching all the videos . At the same time i would make sure the program complies after every video. So when something is broken with your program you know its was during the last few videos.

TheBigOso