java - 如何获取用户当前登录的帖子的 key

Question

我想获取用户当前登录的帖子 ID，即在我的情况下，我需要这个:“-Kqm0-HrwGNgDhvTqOjU”，因为当前用户 ID 是“OiHtZxtLUeh63UzudUChEpSODPx2”。

以便我可以获得当前登录用户的名称

这是我的代码:

public class MyAccount extends AppCompatActivity {

    private Button mSetupButton;
    private EditText mSetupName;
    private EditText mSetupBio;
    private ImageButton mSetupImageButton;
    private FirebaseAuth mAuth;
    private FirebaseAuth.AuthStateListener mAuthListener;
    private String mPostKey=null;
    private DatabaseReference mDatabase;
    private FirebaseDatabase mFirebasedatabase;
    private DatabaseReference myRef;
    private String userId;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my_account);

        DatabaseReference mdatabaseR = FirebaseDatabase.getInstance().getReference().child("Profiles");


        mAuth = FirebaseAuth.getInstance();
        mFirebasedatabase=FirebaseDatabase.getInstance();

        FirebaseUser currentFirebaseUser = FirebaseAuth.getInstance().getCurrentUser() ;
        //Toast.makeText(this, "" + currentFirebaseUser.getUid(), Toast.LENGTH_SHORT).show();




        mSetupName = (EditText) findViewById(R.id.accountName);
        mSetupBio = (EditText) findViewById(R.id.accountBio);
        mSetupButton = (Button) findViewById(R.id.accountButton);
        mSetupImageButton = (ImageButton) findViewById(R.id.accountImageButton);

        final DatabaseReference ref = FirebaseDatabase.getInstance().getReference().child("Profiles");


        String user_id=mAuth.getCurrentUser().getUid();
        DatabaseReference myRef=ref.child(user_id);


        ref.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot snapshot) {
                for (DataSnapshot objSnapshot: snapshot.getChildren()) {
                    String obj = objSnapshot.getKey();
                    Toast.makeText(MyAccount.this,obj, Toast.LENGTH_LONG).show();

                    String post_name = (String) objSnapshot.child("Name").getValue();
                    mSetupName.setText(post_name);

                }
            }
            @Override
            public void onCancelled(DatabaseError firebaseError) {

            }
        });



        //Toast.makeText(MyAccount.this,user_id,Toast.LENGTH_LONG).show();

    }

}

在“String obj”中，由于 for 循环，我获得了所有帖子 id，但在我的情况下，我只需要用户登录的帖子，即其 uid 为“OiHtZxtLUeh63UzudUChEpSODPx2”

Answer 1

你必须循环每个对象，如下所示:

ref.child('users').orderByChild('uid').equalTo('your_uid').on("value", 
function(snapshot) {
 console.log(snapshot.val());

});