我正在制作一個(gè)帳戶片段，所以我想檢索name和image數(shù)據(jù)，但它使我的應(yīng)用程序強(qiáng)制關(guān)閉：這是我的帳戶片段：import android.content.Context;import android.content.Intent;import android.net.Uri;import android.nfc.Tag;import android.os.Bundle;import android.support.annotation.NonNull;import android.support.v4.app.Fragment;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import android.widget.Toast;import com.bumptech.glide.Glide;import com.bumptech.glide.request.RequestOptions;import com.google.android.gms.tasks.OnCompleteListener;import com.google.android.gms.tasks.Task;import com.google.firebase.auth.FirebaseAuth;import com.google.firebase.auth.FirebaseUser;import com.google.firebase.firestore.DocumentSnapshot;import com.google.firebase.firestore.FirebaseFirestore;import com.google.firebase.storage.FirebaseStorage;import com.google.firebase.storage.StorageReference;import java.util.ArrayList;import java.util.List;import java.util.zip.Inflater;import de.hdodenhof.circleimageview.CircleImageView;import static android.support.constraint.Constraints.TAG;/** * A simple {@link Fragment} subclass. */public class AccountFragment extends Fragment { private StorageReference storageReference; private FirebaseAuth firebaseAuth; private FirebaseFirestore firebaseFirestore; private Uri mainImageURI = null; private String user_id; private TextView accountName; private CircleImageView accountImage; public AccountFragment() { // Required empty public constructor } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment View view = inflater.inflate(R.layout.fragment_account, container, false); getUser(); return view; } }); }}
3 回答
互換的青春
TA貢獻(xiàn)1797條經(jīng)驗(yàn) 獲得超6個(gè)贊
這對(duì)我有用：
//in Class definition.
private FirebaseFirestore firebaseFirestore;
private FirebaseAuth firebaseAuth;
private FirebaseUser currentUser;
//Declareation in Oncreate()
currentUser = firebaseAuth.getCurrentUser();
userId = currentUser.getUid();
private void setUserName() {
/*
Assign the value of profile_name_of field in the document of the current user
under Users collection.
pre:---.
post: changes the value of the instance variable of username.
*/
firebaseFirestore.collection("Users").document(userId)
.get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
@Override
public void onComplete(@NonNull Task<DocumentSnapshot> task) {
DocumentSnapshot documentSnapshot = task.getResult();
if(documentSnapshot.exists()){
List<String> list = new ArrayList<>();
Map<String, Object> map = documentSnapshot.getData();
if(map != null){
for(Map.Entry<String, Object> entry : map.entrySet()){
list.add(entry.getValue().toString());
}
username = list.get(0);
Toast.makeText(context,
"username"+username,
Toast.LENGTH_LONG).show();
}
}
}
});
}
慕蓋茨4494581
TA貢獻(xiàn)1850條經(jīng)驗(yàn) 獲得超11個(gè)贊
顯然您正在使用未實(shí)例化的變量來(lái)獲取數(shù)據(jù)。嘗試更改它：
protected void getUser() {
FirebaseUser currentUser = FirebaseAuth.getInstance().getCurrentUser();
user_id = currentUser.getUid();
....
}
慕的地6264312
TA貢獻(xiàn)1817條經(jīng)驗(yàn) 獲得超6個(gè)贊
tol獲取用戶的uid，只需使用以下幾行代碼：
FirebaseUser firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
if (firebaseUser != null) {
String uid = firebaseUser.getUid(); //Do what you need to do with your uid
}
firebaseUser檢查無(wú)效性也很重要。
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