如何将Firebase用户数据从DatabaseHandler转移到MypageHolderListFragment？
public class MypageHolderListFragment extends BaseFragment {
private static final String TAG ="MypageHolderListFr.";
private ImageView mFaceImage;
private TextView mTextViewUsrName;
private TextView mTextViewUsrEmail;
private String mDisplayName;
private String mUserEmail;
private String UID;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_mypageholderlist, container, false);
mFaceImage = (ImageView) view.findViewById (R.id.imageView);
mTextViewUsrEmail = (TextView) view.findViewById (R.id.user_email);
mTextViewUsrName = (TextView) view.findViewById (R.id.user_name);
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
DatabaseHandler mDatabaseHandler = new DatabaseHandler();
if (user != null) {
// User is signed in
UID = user.getUid ();
mDisplayName = user.getDisplayName();
mUserEmail = user.getEmail();
mTextViewUsrEmail.setText (mUserEmail);
Log.d (TAG, "UID: " + UID);
Log.d (TAG, "DisplayName: " + mDisplayName);
Log.d (TAG, "UserEmail: " + mUserEmail);
User login_user = mDatabaseHandler.getCurrentUser (UID);
Log.d (TAG, "Login_user username: " + login_user.username);
Log.d (TAG, "Login_user useremail: " + login_user.email);
} else {
Log.d (TAG, "null.");
}
return view;
}
}
=============================================== ==
public class DatabaseHandler {
private static final String TAG = "DatabaseHandler";
public DatabaseHandler() {
mDatabase = FirebaseDatabase.getInstance().getReference();
}
private DatabaseReference mDatabase;
public void saveUser(String userId, String email, String username ) {
User user = new User(username, email);
mDatabase.child("users").child(userId).setValue(user);
}
public User getCurrentUser(String userId) {
mDatabase.child("users").child(userId).addListenerForSingleValueEvent(
new ValueEventListener () {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
User user = dataSnapshot.getValue(User.class);
if (user == null) {
Log.d (TAG, "user is null");
} else {
Log.d (TAG, "user username: " + user.username);
Log.d (TAG, "user email :" + user.email);
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
Log.w(TAG, "getUser:onCancelled", databaseError.toException());
}
});
return user; //**error event because of void method onDataChange()**
}
}
请帮帮我。