如何使用android searchView从firebase firestore搜索数据列表

Question

我使用 Firebase 的 Cloud Firestore 来存储用户和 android Searchview 来提供搜索功能。例如，当用户搜索“jonathan”时，如果他开始输入“j”，我想引入名称以“j”开头的所有用户。我怎样才能做到这一点？

这是我尝试过的：

@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);

        MenuItem search = menu.findItem(R.id.action_search);
        SearchView searchView = (SearchView) search.getActionView();

        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {

            @Override
            public boolean onQueryTextSubmit(String query) {
                //Toast.makeText(MainActivity.this, "SEARCH " + query, Toast.LENGTH_LONG).show();
                searchUsers(query);
                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
                //Toast.makeText(MainActivity.this, "SEARCH " + newText, Toast.LENGTH_LONG).show();
                searchUsers(newText);
                return false;
            }
        });

        return true;
    }

从 Firebase 获取用户：

private void searchUsers(String recherche) {
    if(recherche.length() > 0)
    recherche = recherche.substring(0,1).toUpperCase() + recherche.substring(1).toLowerCase();
    listUsers = new ArrayList<>();

    db.collection("users").whereGreaterThanOrEqualTo("name", recherche)
            .addSnapshotListener(new EventListener<QuerySnapshot>() {
                @Override
                public void onEvent(@Nullable QuerySnapshot snapshots,
                                    @Nullable FirebaseFirestoreException e) {
                    if (e != null) {
                        System.err.println("Listen failed:" + e);
                        return;
                    }
                    listUsers = new ArrayList<User>();

                    for (DocumentSnapshot doc : snapshots) {
                        User user = doc.toObject(User.class);
                        listUsers.add(user);
                    }
                    updateListUsers(listUsers);
                }
            });
}

这仅适用于第一个字母“j”，例如我添加“ja”后，我仍然显示所有“jonathan”

Answer 1

如果找到解决方案，感谢@Oby 的建议。事实上，我并不需要每次触发搜索时都查询数据库，因为我有用户列表。我只需在列表中进行搜索，如下所示：我们首先获取列表：

private void getUsers() {
        db.collection("users").whereEqualTo("etat", 1)
                .addSnapshotListener(new EventListener<QuerySnapshot>() {
                    @Override
                    public void onEvent(@Nullable QuerySnapshot snapshots,
                                        @Nullable FirebaseFirestoreException e) {
                        if (e != null) {
                            System.err.println("Listen failed:" + e);
                            return;
                        }
                        listUsers = new ArrayList<User>();

                        for (DocumentSnapshot doc : snapshots) {
                            User user = doc.toObject(User.class);
                            listUsers.add(user);
                        }
                        updateListUsers(listUsers);
                    }
                });
    }

这是搜索功能：

private void searchUsers(String recherche) {
        if (recherche.length() > 0)
            recherche = recherche.substring(0, 1).toUpperCase() + recherche.substring(1).toLowerCase();

        ArrayList<User> results = new ArrayList<>();
        for(User user : listUsers){
            if(user.getName() != null && user.getName().contains(recherche)){
                results.add(user);
            }
        }
        updateListUsers(results);
    }

这里我通知RecyclerView的Adapter数据发生了变化：

private void updateListUsers(ArrayList<User> listUsers) {

        // Sort the list by date
        Collections.sort(listUsers, new Comparator<User>() {
            @Override
            public int compare(User o1, User o2) {
                int res = -1;
                if (o1.getDate() > (o2.getDate())) {
                    res = 1;
                }
                return res;
            }
        });

        userRecyclerAdapter = new UserRecyclerAdapter(listUsers, InvitationActivity.this, this);
        rvUsers.setNestedScrollingEnabled(false);
        rvUsers.setAdapter(userRecyclerAdapter);
        layoutManagerUser = new LinearLayoutManager(getApplicationContext());
        rvUsers.setLayoutManager(layoutManagerUser);
        userRecyclerAdapter.notifyDataSetChanged();
    }

当然还有 SearchView：

 @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);

        MenuItem search = menu.findItem(R.id.action_search);
        SearchView searchView = (SearchView) search.getActionView();

        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {

            @Override
            public boolean onQueryTextSubmit(String query) {
                //Toast.makeText(MainActivity.this, "SEARCH " + query, Toast.LENGTH_LONG).show();
                searchUsers(query);
                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
                //Toast.makeText(MainActivity.this, "SEARCH " + newText, Toast.LENGTH_LONG).show();
                searchUsers(newText);
                return false;
            }
        });

        return true;
    }