[英]Firebase database DataSnapshot not working
我正在尝试向登录用户显示基于其性别的欢迎消息。 如果为'male', setText("Hello Sir, your mail is: " + user.getEmail())
,否则为setText("Hello Madam, your mail is: " + user.getEmail())
。 这是我的数据库结构:
这是我正在处理的个人档案活动java:
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.support.v7.app.AppCompatActivity;
import com.firebase.client.DataSnapshot;
import com.firebase.client.Firebase;
import com.firebase.client.FirebaseError;
import com.firebase.client.ValueEventListener;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
public class ProfileActivity extends AppCompatActivity {
TextView textViewUserEmail;
private FirebaseDatabase mFirebaseDatabase;
private FirebaseAuth mAuth;
public DatabaseReference myRef;
public String userID;
@Override
protected void onCreate(Bundle saveInstanceState) {
super.onCreate(saveInstanceState);
setContentView(R.layout.activity_profile);
mAuth = FirebaseAuth.getInstance();
Firebase.setAndroidContext(this);
mFirebaseDatabase = FirebaseDatabase.getInstance();
myRef = mFirebaseDatabase.getReference();
final FirebaseUser user = mAuth.getCurrentUser();
userID = user.getUid();
DatabaseReference ref = FirebaseDatabase.getInstance().getReference().child("UsersMale");
textViewUserEmail = (TextView) findViewById(R.id.textViewUserEmail);
loadUserInformation();
ref.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
String myStrign = dataSnapshot.getValue(String.class);
if (user.isEmailVerified() && myStrign.equals("male")) {
textViewUserEmail.setText("Hello Sir, your mail is: " + user.getEmail());
} else {
textViewUserEmail.setText("Hello Madam, your mail is: " + user.getEmail());
}
}
@Override
public void onCancelled(FirebaseError firebaseError) {}
});
}
}
}
代码返回错误。 您能告诉我我在做什么错吗? 提前致谢。
将数据库结构更改为此:
users
uniqueId
name: superman
gender: male
uniqueId
name: girl
gender: female
无需拥有两个父节点UserMale
和UserFemale
,只需创建一个称为users
节点,每个用户将具有一个属性性别。
然后这样做:
FirebaseUser user = mAuth.getCurrentUser();
String userID = user.getUid();
DatabaseReference ref = FirebaseDatabase.getInstance().getReference().child("users");
ref.child(userID).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
String gender=dataSnapshot.child("gender").getValue().toString();
if(gender.equals("male")) {
textViewUserEmail.setText("Hello Sir, your mail is: " + user.getEmail());
} else {
textViewUserEmail.setText("Hello Madam, your mail is: " + user.getEmail());
}
}
@Override
public void onCancelled(FirebaseError firebaseError) {}
});
}
首先检索用户标识,然后将位置放置在users
,然后附加侦听器并检索已登录用户的性别值。
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