Show limited items in RecyclerView

Question

Please Bear my English

I have total 3000 entries in my database and I want to show all those entries in my recyclerView.

Code for my recyclerView :

 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate( savedInstanceState );
    setContentView( R.layout.activity_complaint_reg );

    swipe = (SwipeRefreshLayout) findViewById( R.id.swipe_refresh_complaint );
    swipe.setOnRefreshListener(complaintReg.this );

    swipe.post( new Runnable() {
        @Override
        public void run() {
            swipe.setRefreshing( true );

            fetchdata();
        }
    } );


}
public void  fetchdata(){
    swipe.setRefreshing( true );
    new AsyncLogin().execute();
    swipe.setRefreshing( false );
}

@Override
public void onRefresh() {
    fetchdata();
}


private class AsyncLogin extends AsyncTask<String,Void,String> {
    ProgressDialog pdloding = new ProgressDialog(complaintReg.this);
    HttpURLConnection conn;
    URL url = null;

    @Override
    protected void onPreExecute(){
        super.onPreExecute();

        pdloding.setMessage( "\tLoading.." );
        pdloding.setCancelable( false );
        pdloding.show();
    }

    @Override
    protected String doInBackground(String... strings) {
        try {
            url = new URL("http://localhost/SearchComp.php");
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }

        try {

            // Setup HttpURLConnection class to send and receive data from php and mysql
            conn = (HttpURLConnection) url.openConnection();
            conn.setReadTimeout(READ_TIMEOUT);
            conn.setConnectTimeout(CONNECTION_TIMEOUT);
            conn.setRequestMethod("POST");
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
            return e1.toString();
        }


        try {

            int response_code = conn.getResponseCode();

            // Check if successful connection made
            if (response_code == HttpURLConnection.HTTP_OK) {

                // Read data sent from server
                InputStream input = conn.getInputStream();
                BufferedReader reader = new BufferedReader(new InputStreamReader(input));
                StringBuilder result = new StringBuilder();
                String line;

                while ((line = reader.readLine()) != null) {
                    result.append(line);
                }

                // Pass data to onPostExecute method
                return (result.toString());

            } else {

                return ("unsuccessful");
            }

        } catch (IOException e) {
            e.printStackTrace();
            return e.toString();
        } finally {
            conn.disconnect();
        }


    }

    @Override
    protected void onPostExecute(String result){
        Log.e( TAG,"result"+result );

        pdloding.dismiss();
        List<dataRegComplaint> data = new ArrayList<>(  );
        pdloding.dismiss();
        if(result.equals( "No complaint assgin" )){
            Toast.makeText( complaintReg.this, "No Complaint Assign", Toast.LENGTH_SHORT ).show();
        }else{

            try {

                JSONArray jArray = new JSONArray(result);

                // Extract data from json and store into ArrayList as class objects
                for(int i=0;i<jArray.length();i++){
                    JSONObject json_data = jArray.getJSONObject(i);
                    dataRegComplaint fishData = new dataRegComplaint(
                            json_data.getString("cust_name"),
                            json_data.getString("CatName"),
                            json_data.getString("site_Name"),
                            json_data.getString( "SrcName" ));
                    data.add(fishData);

                    Log.e( TAG, "DATA reesult :"+data );
                }
                // cAdapter.notifyDataSetChanged();
                // Setup and Handover data to recyclerview
                Register_complaints = (RecyclerView)findViewById(R.id.Reg_Complaint_List);
                Reg_Adapter = new Register_Adapter(complaintReg.this,data);
                Register_complaints.setAdapter(Reg_Adapter);
                Register_complaints.setLayoutManager(new LinearLayoutManager(complaintReg.this));
            } catch (JSONException e) {
            }

        }
    }

}

Code for my Adapter :

public class Register_Adapter extends RecyclerView.Adapter<Register_Adapter.MyHolder> {
private Context context;
List<dataRegComplaint> data = Collections.emptyList();
static int total;
View v;

public Register_Adapter(complaintReg complaintReg,List<dataRegComplaint> data) {
this.context = complaintReg;
this.data = data;
}

@NonNull
@Override
public MyHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
    v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.container_register, viewGroup, false);
    return new MyHolder( v );
}

@Override
public void onBindViewHolder(@NonNull MyHolder myHolder, int i) {
    final dataRegComplaint current=data.get(i);
    myHolder.client.setText(current.getClientName());
    myHolder.location.setText("Reason: " + current.getAddress());
    myHolder.product.setText("Client   : " + current.getProduct());
    myHolder.category.setText("Location: " + current.getCategory());

}

@Override
public int getItemCount() {
    return data.size();
}

public class MyHolder extends RecyclerView.ViewHolder{
    TextView client,location,product,category;
    Button complaint_register;
    public MyHolder(@NonNull View itemView) {

        super( itemView );

        client = (TextView) itemView.findViewById( R.id.textclient );
        location = (TextView) itemView.findViewById( R.id.textlocation );
        product  = (TextView) itemView.findViewById( R.id.textproduct );
        category = (TextView) itemView.findViewById( R.id.textcategory );
        complaint_register = (Button) itemView.findViewById( R.id.button_register );
    }
}
}

So whenever i try to show all entries in my recyclerview the app crashes because it can't load all items at once.

So can anyone help me out in this situation.

Answer 1

download the project here and follow below mention steps.

1. Movie.java -> replace with your ModelClass

2. PaginationAdapter -> replace with your adapter[include left methods in PaginationAdapter(check the adapter)]

3. PaginationScrollListener -> Keep this as same[no changes]

in mainActivity.java

1. loadFirstPage() -> call this method after you fetch the data from your server to your app.

2. List movies = Movie.createMovies(adapter.getItemCount());

   you will find this line of code inside loadFirstPage() method. in this, Movie -> ModelClass & createMovies() -> static method that gives your 10 items at a time. you can increase count in for-loop

xml

1. item_list.xml -> your recyclerview row xml

2. item_progress.xml -> keep as same