单击RecycleView项时更新列表视图

Question

I created a listView which is updated on click on item in Reycleview within same page. Date fetch is working,json data is getting and updated in adpater,but new items is extended with previous data in listview

Layout

First row is RecycleView and Below is Listview, Listview should be update when click on item above in recycleview

import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.example.sharanjit.fitness.R;
import com.google.gson.JsonArray;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;


public class AllExercise extends AppCompatActivity {

    ListView list;
    ProgressDialog dialog;
    Context context;
    GetJSONData getJSONData;
    String[] name = {"Abdominals","Arms","Back","Chest","Shoulders","Legs","Cardio"};
    private RecyclerView mRecyclerView;
    private RecyclerView.Adapter mAdapter;
    private RecyclerView.LayoutManager mLayoutManager;
    AllExerciseAdapter adapter;
    ArrayList<Exercise> arrayList;
    boolean first=true;
    int pos=0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.allexercises);
        dialog=new ProgressDialog(this);
        context=getApplicationContext();
        getJSONData=new GetJSONData();
        arrayList=new ArrayList<>();
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        mRecyclerView = (RecyclerView) findViewById(R.id.recycle);
        mRecyclerView.setHasFixedSize(true);
        mLayoutManager =  new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL, false);
        mRecyclerView.setLayoutManager(mLayoutManager);
        mAdapter = new MyAdapter();
        mRecyclerView.setAdapter(mAdapter);
        new FetchData().execute();

        list = (ListView) findViewById(R.id.exercise_list);

        list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Intent intent=new Intent(AllExercise.this,ExerciseView.class);
                startActivity(intent);
            }
        });

    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id=item.getItemId();

        if(id==16908332)
        {
            finish();
        }

        return super.onOptionsItemSelected(item);
    }

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

        public class ViewHolder extends RecyclerView.ViewHolder {

            public ImageView imageView;
            public ViewHolder(View v) {
                super(v);
                imageView = (ImageView)v.findViewById(R.id.imageView11);

            }
        }

        public MyAdapter() {

        }

        @Override
        public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

            View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.exercise_item, parent, false);
          final  ViewHolder vh = new ViewHolder(v);
            vh.imageView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    pos=vh.getAdapterPosition();
                    first=false;
                    new FetchData().execute();
                }
            });
            return vh;
        }


        @Override
        public void onBindViewHolder(ViewHolder holder, final int position) {
            final ViewHolder viewHolder=holder;
            viewHolder.imageView.setImageResource(Constants.exercise_images[position]);
        }

        @Override
        public int getItemCount() {

            return 7;
        }
    }
    public class AllExerciseAdapter extends ArrayAdapter  {


        final private Context cx;

        final private int pos;

        AllExerciseAdapter(Context cx,int pos) {

            super(cx, R.layout.allexercise_list_item, arrayList);

            this.cx = cx;

            this.pos=pos;
        }

        @Override
        public View getView(int position, View vw, ViewGroup group) {
            vw = View.inflate(cx, R.layout.allexercise_list_item, null);
            ImageView imageView=(ImageView)vw.findViewById(R.id.imageView11);
            TextView title=(TextView)vw.findViewById(R.id.textView14);
            TextView cat=(TextView)vw.findViewById(R.id.textView13);

            title.setText(arrayList.get(position).names);
            cat.setText(arrayList.get(position).category);
            if(position==0)
                Log.e("MS",title.getText().toString());

            return vw;
        }
    }

    private class FetchData extends AsyncTask<String,String,String>
    {
        String url="";
        String data="";

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            dialog.setMessage("In Progress...");
            dialog.setCancelable(false);
            dialog.show();
            url="http://www.searchdata.in/fitness/get-exercises.php";
            try {

             data = URLEncoder.encode("category", "UTF-8") + "=" + URLEncoder.encode(name[pos], "UTF-8");

            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }

        }

        @Override
        protected String doInBackground(String... params) {
            String s=  getJSONData.getData(url,data);
            return s;
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);

            Log.e("sss",s);

            try {
                JSONArray array=new JSONArray(s);
                for(int i=0;i<array.length();i++)
                {
                    JSONObject object=array.getJSONObject(i);
                    Exercise exercise=new Exercise();
                    exercise.names=object.getString("name");
                    exercise.category=object.getString("category");
                    exercise.decription=object.getString("description");
                    arrayList.add(exercise);
                }
                    dialog.dismiss();
            } catch (JSONException e) {
                e.printStackTrace();
            }
            Log.e("ss",""+first);
            adapter = new AllExerciseAdapter(context,pos);
            if(!first) {
                list.setAdapter(adapter);
                adapter.notifyDataSetChanged();

                      }
else {
                list.setAdapter(adapter);




            }
        }
    }

    private class Exercise
    {
        public String names;
        public String decription;
        public String category;
        public String imagePath;
    }

}

Answer 1

You need to make a small change in your code -

if(!first) {
          list.setAdapter(adapter);
          adapter.notifyDataSetChanged(); // No needed to do for first time
}
else {
          list.setAdapter(adapter); // Need to call only once.
          adapter.notifyDataSetChanged();// Here you need to call it to reflect changes   

 }

One more change you need to do in onPostExecute -

try {
            JSONArray array=new JSONArray(s);
            arraList.clear();   //Add this line
            for(int i=0;i<array.length();i++)

Hope it will help :)

Answer 2

Just Change your onPostExecute method by below code.

     @Override
     protected void onPostExecute(String s) {
        super.onPostExecute(s);

        Log.e("sss",s);

        try {
            arrayList=new ArrayList<>();
            JSONArray array=new JSONArray(s);
            for(int i=0;i<array.length();i++)
            {
                JSONObject object=array.getJSONObject(i);
                Exercise exercise=new Exercise();
                exercise.names=object.getString("name");
                exercise.category=object.getString("category");
                exercise.decription=object.getString("description");
                arrayList.add(exercise);
            }
                dialog.dismiss();
        } catch (JSONException e) {
            e.printStackTrace();
        }
        Log.e("ss",""+first);
        adapter = new AllExerciseAdapter(context,pos);

         list.setAdapter(adapter);
        /*if(!first) 
         {
            adapter.notifyDataSetChanged();

         }
         else {
            list.setAdapter(adapter);
         }*/
    }

Answer 3

This Line Is working for the code:-

adapter = new AllExerciseAdapter(context,arrayList);
adapter.setNotifyOnChange(true); // <-----
list.setAdapter(adapter);