Question

我想要做的是搜索客户的地址簿（电话号码），只显示他们的电话号码是否已注册，只显示在firebase上注册的联系人。（有点像Whatsapp）

目前我正在firebase上显示所有注册用户

代码：

public class Tab1 extends Fragment {
    private static final String TAG = "MyActivity";
    private Button signOut;
    private FirebaseAuth.AuthStateListener authListener;
    private FirebaseAuth auth;
     ListView listView;
    private DatabaseReference mDatabase;
    String userID;
    ArrayList<String> userNames = new ArrayList<>();
    ArrayList<String> uid = new ArrayList<>();
    String receiverUID,receivername;


    //Overriden method onCreateView
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View v = inflater.inflate(R.layout.tab1, container, false);

        //get firebase auth instance
        auth = FirebaseAuth.getInstance();

        //get current user
        final FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();



       authListener = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser user = firebaseAuth.getCurrentUser();
                if (user == null) {
                    // user auth state is changed - user is null
                    // launch login activity
                    startActivity(new Intent(getActivity(), LoginActivity.class));
                    getActivity().finish();
                }
            }
        };

        mDatabase = FirebaseDatabase.getInstance().getReference().child("users");
        mDatabase.keepSynced(true);
        listView = (ListView) v.findViewById(R.id.listview);

        mDatabase.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {

                //User user = dataSnapshot.getValue(User.class);
                //Get map of users in datasnapshot
                collectUserNames((Map<String, Object>) dataSnapshot.getValue());
            }


            @Override
            public void onCancelled(DatabaseError databaseError) {
                //Error in Reaching Database
                Log.d("TAB1","tab1 error");
            }


        } );


        //Getting username from listview
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            public void onItemClick(AdapterView<?> a, View v, int position,
                                    long id) {
                String s =Integer.toString(position);
                receiverUID = uid.get(position);
                receivername = userNames.get(position);

                Toast.makeText(getContext(),s , Toast.LENGTH_SHORT).show();
                Log.v("log_tag", "List Item Click");
                 NewReminder();
            }
        });





        //Returning the layout file after inflating
        //Change R.layout.tab1 in you classes

        return v;
    }

    private void collectUserNames(Map<String, Object> users) {



        //iterate through each user, ignoring their UID
        for (Map.Entry<String, Object> entry : users.entrySet()){

            //Get user map
            Map singleUser = (Map) entry.getValue();
            //Getting UID of every user and adding to the Array
            String Key = entry.getKey();
            Log.d("KEy Value",Key);
            //Removing the Current User's ID from the Display List

            if(!Key.equals(userID)) {
                uid.add(Key);


                //Get usernames and append to list and array
                userNames.add((String) singleUser.get("username"));
            }
           //Display all usernames
            ArrayAdapter adapter = new ArrayAdapter(getContext(), android.R.layout.simple_list_item_1, userNames);
            listView.setAdapter(adapter);
        }


    }

查找我当前的Firebase数据库模型 Here

Answer 1

首先，您必须从客户端设备获取所有联系人，

注意：您必须自己检查联系人权限，并且不要忘记添加权限清单。

在onCreate或检查权限后调用initData（）。

这是从客户端设备获取联系人的代码。

private void initData() {
    Cursor cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,null,null,null);
    while(Objects.requireNonNull(cursor).moveToNext()){
        String name = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
        String number = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
        // Finds the contact in our database through the Firebase Query to know whether that contact is using our app or not.
        findUsers(number);
    }
}

从客户端设备一个接一个地获取每个联系人的同时，我们将触发firebase查询，以检查该联系人是否正在使用我们的应用。

因此，我们正在使用“ findUser”方法来检查该联系人是否正在使用我们的应用程序。

private void findUsers(final String number){
    Query query = FirebaseDatabase.getInstance().getReference()
            .child("User")
            .orderByChild("phone")
            .equalTo(number);

    query.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot snapshot) {
            if (snapshot.getValue() != null){
                Map<String, Object> map = (Map<String, Object>) snapshot.getValue();
                // this will print whole map of contacts who is using our app from clients contacts.
                Log.d("ContactSync", snapshot.getValue().toString());
                // so you can use any value from map to add it in your Recycler View.
            }
        }

        @Override
        public void onCancelled(@NonNull DatabaseError error) {
            Log.d("ContactSync", error.getMessage());
        }
    });
}

这是我的数据库结构的样子。

感谢您阅读此答案，希望对您有所帮助！

如何从客户的地址簿（通过电话号码）显示仅注册的联系人列表（在firebase上）

1 个答案: