Question

您好，我正在开发一个应用程序，以在实现该应用程序时获取其应用程序的联系人，我正在接收该应用程序以敬酒所有联系人，但是联系人不在Firebase数据库中使用。我尝试了很多，但仍然无法将其存储在Firebase中。为了检查它，我尝试举杯，并获得所有列表，但没有存储。以下是代码

public ProgressDialog dialog;
public DatabaseReference db; 




@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    FirebaseApp.initializeApp(this);
    db = FirebaseDatabase.getInstance().getReference().child("contact-fetch-firebase");
    setContentView(R.layout.activity_main);
    dialog = new ProgressDialog(this);
    dialog.setMessage("Uploading contacts...");


    Cursor contacts = getContentResolver().query(
            ContactsContract.CommonDataKinds.Phone.CONTENT_URI,new String[]{
                    ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,
                    ContactsContract.CommonDataKinds.Phone.NUMBER
            },
            null,
            null,
            null
    );


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

    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();


    Iterator i = map.keySet().iterator();
    while(i.hasNext()) {
        String key=(String)i.next();
        Object value=(Object) map.get(key);



                Toast.makeText(getBaseContext(), "Name: " + key + " Contact Number: " + value, Toast.LENGTH_LONG).show();
            }


    db.updateChildren(map)

            .addOnSuccessListener(new OnSuccessListener<Void>() {
                @Override
                public void onSuccess(Void aVoid) {
                    String key = db.child("user").push().getKey();
                    String value = db.child("key").push().getKey();

                    dialog.dismiss();
                    Toast.makeText(MainActivity.this, "Contacts uploaded successfully!", Toast.LENGTH_SHORT).show();
                }
            })

            .addOnFailureListener(new OnFailureListener() {
                @Override
                public void onFailure(@NonNull Exception e) {
                    dialog.dismiss();
                    Log.w("MKN","Error: "+e.getMessage());
                    Toast.makeText(MainActivity.this, "Contacts upload failed.", Toast.LENGTH_SHORT).show();
                }
            });


        }


    }

Answer 1

首先要考虑的是更改数据库的身份验证规则，

以下规则仅允许经过身份验证的用户读取或写入数据。

{
  "rules": {
    ".read": "auth != null",
    ".write": "auth != null"
  }
}

以下规则将允许每个人无需身份验证即可读取和写入数据。

{
  "rules": {
    ".read": true,
    ".write": true
  }
}

Answer 2

尝试这种方式-

Iterator i = map.keySet().iterator();
while(i.hasNext()) {
    String key=(String)i.next();
    Object value=(Object) map.get(key);

     db.updateChildren(map)
        .addOnSuccessListener(new OnSuccessListener<Void>() {
            @Override
            public void onSuccess(Void aVoid) {
                String key = db.child("user").push().getKey();
                String value = db.child("key").push().getKey();

                dialog.dismiss();
                Toast.makeText(MainActivity.this, "Contacts uploaded successfully!", Toast.LENGTH_SHORT).show();
            }
        })

        .addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
                Log.w("MKN","Error: "+e.getException());
            }
        });
}

从Firebase数据库中获取数据：它似乎只是敬酒而未保存在Firebase数据库中

2 个答案: