CODEWITHSUNDEEP
androidandroid-recyclerviewmaterial-design
yousef
yousef

Reputation: 292

Updating RecyclerView when activity resumes?

I have a QuestionActivity were I show the list of questions in the RecyclerView.

I have two action in toolbar

  1. Go to downloadedFile activity.

  2. Go to favorite activity.

Every thing is OK but when I hit one of that actions and return to QuestionActivity the RecyclerView couldn't get updated.

So I need to override OnResume Method. My question is, How can I update RecyclerView in onResume Method .

AdapterRecyclerQuestion code :

public class AdapterRecyclerQuestion extends RecyclerView.Adapter<AdapterRecyclerQuestion.ViewHolder> {

    private Context context;
    private ArrayList<ModelQuestion> questionha;
    private int lastd;


    ////////////////////////////////////////////////////////////
    //================== Constructor   =========================
    ////////////////////////////////////////////////////////////

    public AdapterRecyclerQuestion(Context context, ArrayList<ModelQuestion> questionha) {
        this.context = context;
        this.questionha = questionha;
    }

    ////////////////////////////////////////////////////////////
    //================== view holder  =========================
    ////////////////////////////////////////////////////////////

    public class ViewHolder extends RecyclerView.ViewHolder {
        private TextView txtTitle;
        private TextView txtDesc;
        private TextView txtCntDown;
        private Button btnDownload;
        private ImageView imgAddFav;
        private ProgressBar prgDownload;

        ////////////////////////////////////////////////////////////
        //================== View holder constructor  ==============
        ////////////////////////////////////////////////////////////

        public ViewHolder(View itemView) {
            super(itemView);
            txtTitle = (TextView) itemView.findViewById(R.id.txt_title_question);
            txtDesc = (TextView) itemView.findViewById(R.id.txt_desc_question);
            txtCntDown = (TextView) itemView.findViewById(R.id.txt_cnt_down_question_dy);
            btnDownload = (Button) itemView.findViewById(R.id.btn_down_question);
            imgAddFav = (ImageView) itemView.findViewById(R.id.img_add_to_fav);
            prgDownload = (ProgressBar) itemView.findViewById(R.id.prgDownload);
        }
    }
    ////////////////////////////////////////////////////////////
    //================== on create view holder  ================
    ////////////////////////////////////////////////////////////

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.question_row, parent, false);
        return new ViewHolder(view);
    }

    ////////////////////////////////////////////////////////////
    //================== on bind view holder  =================
    ////////////////////////////////////////////////////////////

    @Override
    public void onBindViewHolder(final ViewHolder holder, final int position) {


        QuestionDatabaseAdapter questionDatabaseAdapter = new QuestionDatabaseAdapter(holder.itemView.getContext());

        holder.txtTitle.setText(questionha.get(position).getQuestionTitle());
        holder.txtDesc.setText(questionha.get(position).getQuestionDesc());
        holder.txtCntDown.setText(questionha.get(position).getQuestionDownCnt());

        ////////////////////////////////////////////////////////////
        //================== Favorite checking  ====================
        ////////////////////////////////////////////////////////////


        boolean isFavorite = questionDatabaseAdapter.isQuestionFavorite(questionha.get(position).getQuestionId());

        if (isFavorite)

        {
            holder.imgAddFav.setImageResource(R.drawable.ic_favorite_red_700_24dp);
        } else

        {
            holder.imgAddFav.setImageResource(R.drawable.ic_favorite_border_red_a700_24dp);
        }


        ////////////////////////////////////////////////////////////
        //================== img add fav listener  =================
        ////////////////////////////////////////////////////////////

        holder.imgAddFav.setOnClickListener(new View.OnClickListener() {

                                                @Override
                                                public void onClick(View v) {

                                                    QuestionDatabaseAdapter databaseAdapter = new QuestionDatabaseAdapter(v.getContext());
                                                    boolean isFav = databaseAdapter.isQuestionFavorite(questionha.get(position).getQuestionId());

                                                    if (!isFav) {
                                                        Toast.makeText(v.getContext(), "به لیست علاقه مندی ها اضافه شد", Toast.LENGTH_SHORT).show();
                                                        holder.imgAddFav.setImageResource(R.drawable.ic_favorite_red_700_24dp);
                                                        ModelQuestion question = new ModelQuestion();

                                                        question.setQuestionId(questionha.get(position).getQuestionId());
                                                        question.setQuestionTitle(questionha.get(position).getQuestionTitle());
                                                        question.setQuestionDesc(questionha.get(position).getQuestionDesc());
                                                        question.setQuestionDownLink(questionha.get(position).getQuestionDownLink());
                                                        question.setQuestionDownFileName(questionha.get(position).getQuestionDownFileName());

                                                        databaseAdapter.saveQuestion(question);
                                                    } else {
                                                        Toast.makeText(v.getContext(), "از لیست علاقه مندی ها پاک شد", Toast.LENGTH_SHORT).show();
                                                        holder.imgAddFav.setImageResource(R.drawable.ic_favorite_border_red_a700_24dp);
                                                        databaseAdapter.deleteQuestion(questionha.get(position).getQuestionId());
                                                    }
                                                }
                                            }
        );
    }

    ////////////////////////////////////////////////////////////
    //================== get item count method  ================
    ////////////////////////////////////////////////////////////
    @Override
    public int getItemCount() {
        if (questionha.size() == 0) {
            return 0;
        } else {
            return questionha.size();
        }
    }
}

Thanks.

Upvotes: 5

Views: 10997

Answers (3)

yousef
yousef

Reputation: 292

Thanks to Anoop M , I just write the solution work for me . I write This code in QuestionActivity .

    ////////////////////////////////////////////////////////////
    //================== on Resume   ===========
    ////////////////////////////////////////////////////////////

    @Override
    protected void onResume() {
        super.onResume();
        adapterRecyclerQuestion.notifyDataSetChanged();
        recyclerQuestion.setAdapter(adapterRecyclerQuestion);
    }

Upvotes: 1

Amritpal Singh
Amritpal Singh

Reputation: 1002

Loaders are best suited for such purposes where you want all database changes to be notified and reflected on the UI.

If your are making some changes in database from other two activities and wanted the UI to be updated on QuestionActivity, just make a loader and start it in onResume().

Go through this link to implement a loader: http://www.grokkingandroid.com/using-loaders-in-android/

Upvotes: 1

Harshit
Harshit

Reputation: 633

You can try this. create a setter for your ArrayList<ModelQuestion> questionha; in the Adapter.

public void setData(ArrayList<ModelQuestion> data){
    questionha=data;
    notifyDataSetChanged();
}

And call this in your onResume() with the new Data

Remember to call the notifyDataSetChanged(); or specific notifiyItemChangedAt(pos) etc if you know Item at which position has changed an so on. You can choose from - https://developer.android.com/reference/android/support/v7/widget/RecyclerView.Adapter.html

Upvotes: 0

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