Firebase：Android：如何显示已安装应用的联系人列表

Question

我通过firebase使用Google身份验证并成功记录用户。我还从电话簿（设备）中检索了联系人列表，并将其显示在我的应用程序中的片段中的列表视图中。但现在我希望向我的联系人中显示安装了我的应用程序的用户，以便点击时他们会与他们进行私聊，其他联系人在点击时会启用他们发送应用邀请。简而言之：我想查看在其设备上安装了应用程序的联系人列表。

Answer 1

无法直接列出联系人。您需要为firebase数据库中的用户创建一个节点，以便在注册后存储用户详细信息，然后您可以检索这些用户详细信息。

Answer 2

我告诉你你正在使用firebase。现在，如果安装在一个设备中，您希望应用程序在firebase数据库中将所有联系人上传到您的服务器。

试试以下代码：

public class YourActivity extends AppCompatActivity {

ProgressDialog dialog;
DatabaseReference yourReference;//your database reference

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    yourReference = FirebaseDatabase.getInstance().getReference().child("users");
    setContentView(R.layout.activity_your);
    dialog = new ProgressDialog(this);
    dialog.setMessage("Uploading contacts...");

// Query for contacts through content resolver. You will get a cursor.
    Cursor contacts = getContentResolver().query(
            ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
            new String[]{
                    ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,
                    ContactsContract.CommonDataKinds.Phone.NUMBER
            },
            null,
            null,
            null
    );

// If you have a list as your data, firebase facilitates you to upload that easily by a single HashMap object. Create a HashMap object.

    HashMap<String,Object> map = new HashMap<>();

// Loop contacts cursor with map to put all contacts in map. I used contact name as key and number as its value (simple and pretty way).
    if(contacts!=null) {
        while(contacts.moveToNext()){
            map.put(
                    contacts.getString(contacts.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME)),
                    contacts.getString(contacts.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER))
            );
        }
        contacts.close();
    }

    dialog.show();
//write map to firebase database reference...
    yourReference.updateChildren(map)
//this onSuccessListener is optional. You can terminate above line of code by ";" (semicolon).
            .addOnSuccessListener(new OnSuccessListener<Void>() {
                @Override
                public void onSuccess(Void aVoid) {
                    dialog.dismiss();
                    Toast.makeText(YourActivity.this, "Contacts uploaded suffessfully!", Toast.LENGTH_SHORT).show();
                }
            })
//this onFailureListener is also optional.
    .addOnFailureListener(new OnFailureListener() {
        @Override
        public void onFailure(@NonNull Exception e) {
            dialog.dismiss();
            Log.w("MKN","Error: "+e.getMessage());
            Toast.makeText(YourActivity.this, "Contacts upload failed.", Toast.LENGTH_SHORT).show();
        }
    });
}
}

您需要提供READ_CONTACTS权限才能查询Contacts表。同样在firebase规则中，“write”键的值必须为“true”才能写入数据库。

Answer 3

首先检索联系人列表..

    'ContentResolver cr = getContext().getContentResolver();
        Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI,null, null, null, null);
        if (cur.getCount() > 0) {
            while (cur.moveToNext()) {
                String id = cur.getString(cur.getColumnIndex(ContactsContract.Contacts._ID));
                Cursor cur1 = cr.query(
                        ContactsContract.CommonDataKinds.Email.CONTENT_URI, null,
                        ContactsContract.CommonDataKinds.Email.CONTACT_ID + " = ?",
                        new String[]{id}, null);
                while (cur1.moveToNext()) {
                    //to get the contact names
                    HashMap<String, String> map = new HashMap<>();

                    String name=cur1.getString(cur1.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
                    String email = cur1.getString(cur1.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA));

                    if( email != null ){
                        map.put("name", name);
                        map.put("email", email);
                        getContactList.add(map);
                    }
                }
                cur1.close();
            }
        }'

在此之后，您可以维护一个可以存储经过身份验证的用户信息的firebase数据库表，您可以将联系人与您从firebase用户的数据库中提取的列表同步。

    'mapChat = new HashMap<>();
        Log.d("Debug", clist.toString());
        userReference1 = FirebaseDatabase.getInstance().getReference().child("Users");
        userReference1.keepSynced(true);
        userReference1.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                for (int x = 0; x < clist.size(); x++) {
                    //Log.d("Debug" ,list.get(x).get("email").toString());

                    for (DataSnapshot dsp : dataSnapshot.getChildren()) {

                        if (dsp.hasChild("email")) {

                            //    Log.d("Debug" , "setnewuser "  + dsp.child("email").getValue().toString());
                            if (dsp.child("email").getValue().toString().equals(clist.get(x).get("email").toString())) {
                                Log.d("Debug", "contact updated");
                                String uid = dsp.getKey().toString();
                                reference1 = FirebaseDatabase.getInstance().getReference().child("Users").child(id).child("contacts").child(uid);

                                mapChat.put("name", clist.get(x).get("name"));
                                mapChat.put("email", clist.get(x).get("email"));
                                mapChat.put("chats", "false");
                                reference1.setValue(mapChat);
                            }
                        }
                    }
                }
                reference1.onDisconnect();
                contactIdInterface1.contactUpdated();
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });'

Answer 4

在firebase中启用并实现电话号码登录方法，这样你就可以从firebase中检索联系人并将其与本地联系人列表进行比较，之后便于实现你的逻辑