public class AdapterQuestion extends RecyclerView.Adapter<AdapterQuestion.ViewQuestion>{ private LayoutInflater mLayoutInflater; private ArrayList<QuestionData> mListblogs =new ArrayList<>(); public AdapterQuestion(Context context){ mLayoutInflater=LayoutInflater.from(context); } public void setBloglist(ArrayList<QuestionData> listBlogs){ this.mListblogs =listBlogs; notifyItemRangeChanged(0, listBlogs.size()); } @Override public ViewQuestion onCreateViewHolder(ViewGroup parent, int viewType) { View view= mLayoutInflater.inflate(R.layout.customquestion, null); ViewQuestion holder=new ViewQuestion(view); return holder; } @Override public void onBindViewHolder(ViewQuestion holder, int position) { QuestionData currentBlog= mListblogs.get(position); holder.answerText.setText(currentBlog.getMtext()); holder.answerId.setText(currentBlog.getId()); holder.mVotes.setText(currentBlog.getVotes()); } @Override public int getItemCount() { return mListblogs.size(); } public static class ViewQuestion extends RecyclerView.ViewHolder{ private TextView answerText; private TextView answerId; private TextView mVotes; private LikeButton mLikeButton; public ViewQuestion (View view){ super(view); answerText=(TextView)itemView.findViewById(R.id.answerText); answerId=(TextView)itemView.findViewById(R.id.answerId); mVotes=(TextView)itemView.findViewById(R.id.VoteTextView); mLikeButton=(LikeButton)itemView.findViewById(R.id.heart_buttons); mLikeButton.setOnLikeListener(new OnLikeListener() { @Override public void liked(LikeButton likeButton) { Voting vote = new Voting(); vote.onUpVote(convertToString(),mVotes); } @Override public void unLiked(LikeButton likeButton) { Voting onDown=new Voting(); onDown.onDownVote(convertToString()); } }); } public String getVoteView(){ String voteView=mVotes.getText().toString(); return voteView; } public String convertToString(){ String converted=answerId.getText().toString(); return converted; } } } public class Voting { public void onUpVote(String Id,final TextView VoteView) { final RequestQueue mrequestQueue = VolleySingleton.getInstance().getRequestQueue(); final String PUT_VOTE_UP = "url"; StringRequest PostVoteUp = new StringRequest(Request.Method.PUT, PUT_VOTE_UP, new Response.Listener<String>() { @Override public void onResponse(String response) { VoteView.setText("likes"); } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { } }); mrequestQueue.add(PostVoteUp); System.out.println("VOTED UP"); } public void onDownVote( String Id) { final RequestQueue mrequestQueue = VolleySingleton.getInstance().getRequestQueue(); final String PUT_VOTE_DOWN = "url"; StringRequest PostVoteUp = new StringRequest(Request.Method.PUT, PUT_VOTE_DOWN, new Response.Listener<String>() { @Override public void onResponse(String response) { } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { error.printStackTrace(); System.out.println("************Answer" + error + "error"); } }); mrequestQueue.add(PostVoteUp); System.out.println("VOTED DOWN"); } } I have Two classes, an adapter class for my fragment activity and a voting class. I am calling the voting class in my adapter class when a user presses a button, However, I also have a JSON request and a parse method in my fragment activity as shown below and I would like to only update the "votes" when the button is pressed How can I do this?
private ArrayList<QuestionData> parseJSONResponseQuestion(JSONArray response) { if (!response.equals("")) { ArrayList<QuestionData> questionDataArrayList = new ArrayList<>(); try { StringBuilder data = new StringBuilder(); for (int i = 0; i < response.length(); i++) { JSONObject currentQuestions = response.getJSONObject(i); String text = currentQuestions.getString("text"); String votes = currentQuestions.getString("votes"); int voteInt=Integer.parseInt(votes); QuestionData questionData = new QuestionData(); questionData.setMtext(text); questionData.setVotes(votes); } System.out.println(data.toString()); } catch (JSONException e) { e.printStackTrace(); } } return mListblogs; } 3 Answers
Answers 1
First you should add a method into your adapter for updating single QuestionData. For example:
public void setBlogItem(int index, QuestionData questionData) { if (mListblogs.get(index).getVotes() != questionData.getVotes()) { mListblogs.set(index, questionData); notifyItemChanged(index); } } Second. Update question. For doing this you have to know index of the item. I suggest that the whole list doesn't change. So, modify your json parser:
private ArrayList<QuestionData> parseJSONResponseQuestion(JSONArray response) { if (!response.equals("")) { ArrayList<QuestionData> questionDataArrayList = new ArrayList<>(); try { StringBuilder data = new StringBuilder(); for (int i = 0; i < response.length(); i++) { JSONObject currentQuestions = response.getJSONObject(i); String text = currentQuestions.getString("text"); String votes = currentQuestions.getString("votes"); int voteInt=Integer.parseInt(votes); QuestionData questionData = new QuestionData(); questionData.setMtext(text); questionData.setVotes(votes); recyclerAdapter.setBlogItem(i, questionData); /// Put attention here! } System.out.println(data.toString()); } catch (JSONException e) { e.printStackTrace(); } } return mListblogs; } Answers 2
I'm assuming you're using a LinearLayoutManager for your RecyclerView.
Pass the clicked position from your ViewQuestion's onClick() to your onUpVote() and onDownVote() methods.
From the onUpVote() and onDownVote() methods, post a Broadcast specifying whatever data in your intent.putExtras and also include the clicked position.
Now on your Activity, write a BroadcastReceiver which captures the broadcasts sent from the onUpVote() or onDownVote() methods. Now from the Activity, call your LinearLayoutManager.findViewByPosition(position) method to get a reference to your View which was clicked. Now you can use findViewById() method to find your required view and update the values.
Answers 3
Sounds like your application needs a bit of architecture work. Have you considered restricting your use of JSON to only when you need to read or write the data to a file or network or something similar. If your mixing JSON up in your model then you might be writing much more code than you need.
Just a thought ...
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