Как да добавите лента за търсене към RecyclerView с карти

Можете лесно да добавите SearchView към вашия ActionBar като елемент от менюто с actionView (пример). След това въз основа на SearchView.OnQueryTextListener ще можете да приложите заявка за търсене към вашия адаптер. Какво точно те спира по този път?

Опитайте този код

1) MainActivity.class

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "userList";
    private RecyclerView mRecyclerView;
    private MyRecyclerAdapter adapter;
    private TextView ParticipantsCounts;
    private ArrayList<HashMap<String, String>> list;
    private HashMap<String, String> listsub;
    private Context context;
    private SwipeRefreshLayout swipeRefreshLayout;

    private final String urlmain = "http://bmcctroika.hol.es/get-data.php";
    private ProgressDialog pDialog;
    private Integer result = 0;
    private HttpURLConnection urlConnection;
    private URL url;
    private int statusCode;
    private StringBuilder response;
    private BufferedReader r;
    private String line;
    private JSONArray posts;
    private SearchView search;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);
        context = MainActivity.this;

        search = (SearchView) findViewById(R.id.search);

        // Initialize recycler view
        mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
        ParticipantsCounts = (TextView) findViewById(R.id.ParticipantsCount);

        // Downloading data from below url
        new AsyncHttpTask().execute(urlmain);

        swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh_layout);
        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                refreshitems();
                swipeRefreshLayout.setRefreshing(false);
            }
        });
    }

    private void refreshitems() {

        new AsyncHttpTask().execute(urlmain);
    }

    public class AsyncHttpTask extends AsyncTask<String, Void, Integer> {

        @Override
        protected void onPreExecute() {

            pDialog = new ProgressDialog(context);
            pDialog.setMessage("Please wait");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(false);
            pDialog.show();
        }

        @Override
        protected Integer doInBackground(String... params) {

            data1(params);

            return result; //"Failed to fetch data!";
        }

        @Override
        protected void onPostExecute(Integer result) {

            pDialog.dismiss();

            // Download complete.
            if (result == 1) {

                ParticipantsCounts.setText("No. of Participants : " + String.valueOf(posts.length()));

                if (list.size() > 0) {
                    mRecyclerView.setLayoutManager(new LinearLayoutManager(mRecyclerView.getContext()));
                    adapter = new MyRecyclerAdapter(mRecyclerView.getContext(), list);
                    mRecyclerView.setAdapter(adapter);

                    search.setOnQueryTextListener(listener);

                } else {
                    Toast.makeText(context, "No list found!", Toast.LENGTH_SHORT).show();

                }
            } else {
                Toast.makeText(context, "Failed to fetch data!", Toast.LENGTH_SHORT).show();
            }
        }
    }

    SearchView.OnQueryTextListener listener = new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {
            return false;
        }

        @Override
        public boolean onQueryTextChange(String query) {
            query = query.toLowerCase();

            final ArrayList<HashMap<String, String>> filteredList = new ArrayList<>();

            for (int i = 0; i < list.size(); i++) {

                final String text = list.get(i).toString().toLowerCase();
                if (text.contains(query)) {

                    filteredList.add(list.get(i));
                }
            }

            mRecyclerView.setLayoutManager(new LinearLayoutManager(mRecyclerView.getContext()));
            adapter = new MyRecyclerAdapter(mRecyclerView.getContext(), filteredList);
            mRecyclerView.setAdapter(adapter);
            adapter.notifyDataSetChanged();
            return true;
        }
    };


    private void data1(String... params) {

        try {
            url = new URL(params[0]);
            urlConnection = (HttpURLConnection) url.openConnection();
            statusCode = urlConnection.getResponseCode();

            // 200 represents HTTP OK
            if (statusCode == 200) {
                r = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
                response = new StringBuilder();

                while ((line = r.readLine()) != null) {
                    response.append(line);
                }

                parseResult(response.toString());
                result = 1; // Successful

            } else {
                result = 0; //"Failed to fetch data!";
            }
        } catch (Exception e) {
            Log.d(TAG, e.getLocalizedMessage());
        }
    }


    private void parseResult(String result) {
        try {
            JSONObject response = new JSONObject(result);
            posts = response.optJSONArray("result");
            list = new ArrayList<>();
            Log.e("posts", "posts" + posts.length());
            for (int i = 0; i < posts.length(); i++) {
                JSONObject post = posts.optJSONObject(i);
                listsub = new HashMap<>();
                listsub.put("fullname", post.optString("fullname"));
                listsub.put("contactno", post.optString("contactno"));
                listsub.put("emailaddress", post.optString("emailaddress"));
                listsub.put("eventname", post.optString("eventname"));
                listsub.put("collegename", post.optString("collegename"));
                list.add(listsub);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}

2) activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">


    <SearchView
        android:id="@+id/search"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:layout_marginTop="10dp"
        android:background="@android:color/holo_blue_dark"
        android:hint="Search here"
        android:paddingLeft="20dp"
        android:paddingRight="20dp"
        android:textColor="@android:color/black"
        android:textColorHint="@android:color/black"
        android:textSize="15dp" />

    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/swipe_refresh_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:layout_margin="10dp">

            <TextView
                android:id="@+id/ParticipantsCount"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:textColor="@android:color/black"
                android:textSize="15dp" />

            <android.support.v7.widget.RecyclerView
                android:id="@+id/recycler_view"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

            </android.support.v7.widget.RecyclerView>
        </LinearLayout>
    </android.support.v4.widget.SwipeRefreshLayout>
</LinearLayout>

3) MyRecyclerAdapter.class

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

    private ArrayList<HashMap<String, String>> list;
    private HashMap<String, String> listsub;
    private Context mContext;
    View view;

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public final View mView;

        public TextView textView, contactTV, emailTV, collegename, eventname;


        public ViewHolder(View view) {
            super(view);

            mView = view;

            this.textView = (TextView) view.findViewById(R.id.title);
            this.contactTV = (TextView) view.findViewById(R.id.contactTV);
            this.emailTV = (TextView) view.findViewById(R.id.emailTV);
            this.eventname = (TextView) view.findViewById(R.id.eventname);
            this.collegename = (TextView) view.findViewById(R.id.collegename);

        }
    }

    public MyRecyclerAdapter(Context context, ArrayList<HashMap<String, String>> feedItemList) {
        list = feedItemList;
        this.mContext = context;
    }

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

        view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.list_row, parent, false);

        return new ViewHolder(view);
    }

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


        listsub = list.get(postion);

        //Setting text view title
        holder.textView.setText(listsub.get("fullname"));
        holder.contactTV.setText(listsub.get("contactno"));
        holder.emailTV.setText(listsub.get("emailaddress"));
        holder.eventname.setText(listsub.get("eventname"));
        holder.collegename.setText(listsub.get("collegename"));

    }


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

}

4) list_row.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="10dp">


    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/title"
        android:textSize="13dp"
        android:textColor="@android:color/black" />

       <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/contactTV"
        android:textSize="13dp"
        android:textColor="@android:color/black" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/emailTV"
        android:textSize="13dp"
        android:textColor="@android:color/black" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/eventname"
        android:textSize="13dp"
        android:textColor="@android:color/black" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/collegename"
        android:textSize="13dp"
        android:textColor="@android:color/black" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="@android:color/black" />

</LinearLayout>

Това е точно това, което търсите, това е пълен пример с търсене и recyclerview

private RecyclerView mRecyclerView;
private ExampleAdapter mAdapter;
private List<ExampleModel> mModels;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    final View view = inflater.inflate(R.layout.fragment_main, container, false);

    mRecyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);

    return view;
}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    setHasOptionsMenu(true);

    mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

    mModels = new ArrayList<>();

    for (String movie : MOVIES) {
        mModels.add(new ExampleModel(movie));
    }

    mAdapter = new ExampleAdapter(getActivity(), mModels);
    mRecyclerView.setAdapter(mAdapter);
}

За повече вижте тази Searchable-RecyclerView-Demo