Question

我想从Android手机向firebase发送主键，这样我就可以识别谁向我发送数据了。所以基本上我正在制作一个将图像发送到服务器的应用程序。我想查看谁给我发了什么。所以我需要一个主键。任何人都可以帮我解决这个问题吗？就像我如何向firebase服务器发送一些独特的东西？

public  void SignUP(View v){

         EditText name = (EditText) findViewById(R.id.editTextRegistrationName);
         EditText contact = (EditText) findViewById(R.id.editTextRegistrationContact);
         EditText city = (EditText) findViewById(R.id.editTextRegistrationCity);
         EditText email = (EditText) findViewById(R.id.editTextRegistrationEmail);
         EditText pass = (EditText) findViewById(R.id.editTextRegistrationPassword);

         String userName = name.getText().toString();
         String userContact = contact.getText().toString();
         String userCity = city.getText().toString();
         String userEmail = email.getText().toString();
         String userPassword = pass.getText().toString();

         if(isOnline() == true){
             FirebaseDatabase database = FirebaseDatabase.getInstance();
             DatabaseReference myRef = database.getReference("Users").push();


             DatabaseReference nam = myRef.child("Name");
             nam.setValue(userName);

             DatabaseReference contac = myRef.child("Contact");
             contac.setValue(userContact);

             DatabaseReference cit = myRef.child("City");
             cit.setValue(userCity);

             DatabaseReference emai = myRef.child("Email");
             emai.setValue(userEmail);

             DatabaseReference passwor = myRef.child("Password");
             passwor.setValue(userPassword);

         }
         else{
              bal.addUser(new UserBean(0,userName,userContact,userCity,userEmail,userPassword));
              Toast.makeText(this, "Data Save in DB", Toast.LENGTH_SHORT).show();
     }

Answer 1

<强>更新

鉴于您希望获得用户的自动生成ID，您只需导入FirebaseAuth，并且只需几行代码就可以为每个用户提供唯一ID。由于数据自动同步，因此无需担心明确将其发送到服务器。您可以在构建JSON树时在代码中随时使用user-id。如果要将其添加到数据中，那么这也是您已经用于其他数据点的简单过程。您在评论中提及的大多数内容已在SDK中正常运行。所以没有必要从头开始重新发明这些功能。

以下代码用于在您的活动中启用Auth。

private FirebaseAuth mAuth;
// ...
mAuth = FirebaseAuth.getInstance();
EmailPasswordActivity.java

文档中的这个简单示例显示了如何使用电子邮件和密码验证某人...

private FirebaseAuth.AuthStateListener mAuthListener;

// ...

@Override
protected void onCreate(Bundle savedInstanceState) {
    // ...
    mAuthListener = new FirebaseAuth.AuthStateListener() {
        @Override
        public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
            FirebaseUser user = firebaseAuth.getCurrentUser();
            if (user != null) {
                // User is signed in
                Log.d(TAG, "onAuthStateChanged:signed_in:" + user.getUid());
            } else {
                // User is signed out
                Log.d(TAG, "onAuthStateChanged:signed_out");
            }
            // ...
        }
    };
    // ...
}

@Override
public void onStart() {
    super.onStart();
    mAuth.addAuthStateListener(mAuthListener);
}

@Override
public void onStop() {
    super.onStop();
    if (mAuthListener != null) {
        mAuth.removeAuthStateListener(mAuthListener);
    }
}
EmailPasswordActivity.java

mAuth.signInWithEmailAndPassword(email, password)
        .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {
                Log.d(TAG, "signInWithEmail:onComplete:" + task.isSuccessful());

                // If sign in fails, display a message to the user. If sign in succeeds
                // the auth state listener will be notified and logic to handle the
                // signed in user can be handled in the listener.
                if (!task.isSuccessful()) {
                    Log.w(TAG, "signInWithEmail:failed", task.getException());
                    Toast.makeText(EmailPasswordActivity.this, R.string.auth_failed,
                            Toast.LENGTH_SHORT).show();
                }

                // ...
            }
        });
EmailPasswordActivity.java

此示例代码显示如何匿名验证用户，无需任何密码。

private FirebaseAuth.AuthStateListener mAuthListener;

// ...

@Override
protected void onCreate(Bundle savedInstanceState) {
    // ...
    mAuthListener = new FirebaseAuth.AuthStateListener() {
        @Override
        public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
            FirebaseUser user = firebaseAuth.getCurrentUser();
            if (user != null) {
                // User is signed in
                Log.d(TAG, "onAuthStateChanged:signed_in:" + user.getUid());
            } else {
                // User is signed out
                Log.d(TAG, "onAuthStateChanged:signed_out");
            }
            // ...
        }
    };
    // ...
}

@Override
public void onStart() {
    super.onStart();
    mAuth.addAuthStateListener(mAuthListener);
}

@Override
public void onStop() {
    super.onStop();
    if (mAuthListener != null) {
        mAuth.removeAuthStateListener(mAuthListener);
    }
}
AnonymousAuthActivity.java

mAuth.signInAnonymously()
        .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {
                Log.d(TAG, "signInAnonymously:onComplete:" + task.isSuccessful());

                // If sign in fails, display a message to the user. If sign in succeeds
                // the auth state listener will be notified and logic to handle the
                // signed in user can be handled in the listener.
                if (!task.isSuccessful()) {
                    Log.w(TAG, "signInAnonymously", task.getException());
                    Toast.makeText(AnonymousAuthActivity.this, "Authentication failed.",
                            Toast.LENGTH_SHORT).show();
                }

                // ...
            }
        });
AnonymousAuthActivity.java

（FirebaseAuth Guide）

启用离线数据同步：（Data offline info）

FirebaseDatabase.getInstance().setPersistenceEnabled(true);

如果要强制将数据树的特定分支存储在本地，您还可以引用该位置并调用keepSynced函数传递true。标题中的注释表示：

/ ** *通过在某个位置调用keepSynced:YES，将自动下载该位置的数据 *保持同步，即使没有为该位置附加听众。此外，虽然保留了一个位置 *同步，它不会从持久磁盘缓存中逐出。 * * @param keepSynced传递YES以保持此位置同步，传递NO以停止同步。 * /

原始回答

我想您可能想在website上查看Android的示例代码。基本上，我认为push（）。getKey（）应该返回自动生成的id，如上所述。我对此的看法是，发布行为将自动生成密钥。

private void writeNewPost(String userId, String username, String title, String body) {
    // Create new post at /user-posts/$userid/$postid and at
    // /posts/$postid simultaneously
    String key = mDatabase.child("posts").push().getKey();
    Post post = new Post(userId, username, title, body);
    Map<String, Object> postValues = post.toMap();

    Map<String, Object> childUpdates = new HashMap<>();
    childUpdates.put("/posts/" + key, postValues);
    childUpdates.put("/user-posts/" + userId + "/" + key, postValues);

    mDatabase.updateChildren(childUpdates);
}

我想将一个主键发送到firebase

1 个答案: