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Firebase数据库更改密钥(复制到新路径删除旧路径)使我的应用程序崩溃

firebase-realtime-database android
  •  0
  • uzaysan  · 技术社区  · 8 年前

    在我的应用程序中,每个用户都有一个唯一的用户名。我保存的用户数据如下: 

    root:
  +users:
    +ricksanchez:
      +name:"Rick Sanchez";
      +email:"rick@sanchez.com";
      +bio:"I'm super smart";
      +followers:
        +follower1:morty;
        +follower2:summer;

    当我想更改用户名时,我必须更改数据库密钥,但firebase没有任何方法可以做到这一点,因此我使用以下代码: 

    private void copyRecord(DatabaseReference fromPath, final DatabaseReference toPath) {
    ValueEventListener valueEventListener = new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            toPath.setValue(dataSnapshot.getValue()).addOnCompleteListener(new OnCompleteListener<Void>() {
                @Override
                public void onComplete(@NonNull Task<Void> task) {
                    if (task.isComplete()) {
                        Log.d(TAG, "Success!");
                    } else {
                        Log.d(TAG, "Copy failed!");
                    }
                }
            });
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {}
    };
    fromPath.addListenerForSingleValueEvent(valueEventListener);
}

    这段代码在第一次运行时效果很好,但当我第二次运行这段代码而不关闭应用程序时,应用程序崩溃,但当我再次运行应用程序后崩溃的作品完美,但再次第二次崩溃

    另外,我在片段中使用此代码,并用以下代码加载片段: 

    public void pushFragment(Fragment fragment){
    FragmentTransaction ft = getFragmentManager().beginTransaction();
    ft.add(R.id.mainframe,fragment).hide(getCurrentFragment()).addToBackStack(null).commit();
}

    我的错误日志: 

    java.lang.IllegalStateException: Fragment UsernameChangeFragment{2a2928de} not attached to a context.
    at android.support.v4.app.Fragment.requireContext(Fragment.java:693)
    at android.support.v4.app.Fragment.getResources(Fragment.java:757)
    at android.support.v4.app.Fragment.getString(Fragment.java:779)
    at sonata.com.sonata.Util.UsernameChangeFragment$2$1.onDataChange(UsernameChangeFragment.java:90)
    at com.google.android.gms.internal.firebase_database.zzfc.zza(Unknown Source)
    at com.google.android.gms.internal.firebase_database.zzgx.zzdr(Unknown Source)
    at com.google.android.gms.internal.firebase_database.zzhd.run(Unknown Source)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:155)
    at android.app.ActivityThread.main(ActivityThread.java:5696)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1028)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)

    你知道为什么吗?

    编辑:我的崩溃片段代码: 

    usernameedittext.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence text, int start, int before, int count) {
            if(text.length()>0){
                if(!text.toString().equals(username)){
                    DatabaseReference ref = FirebaseDatabase.getInstance().getReference().child("users").child(text.toString());

                    ref.addValueEventListener(new ValueEventListener() {
                        @Override
                        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                            if(!dataSnapshot.exists()){







                                /* this is my error line*/ uyarıtext.setText(getString(R.string.youcantakethisusername));







                                uyarıtext.setTextColor(Color.parseColor("#00ff00"));
                                uyarıtext.setVisibility(View.VISIBLE);
                            }
                            else{
                                uyarıtext.setText(getString(R.string.usernametaken));
                                uyarıtext.setTextColor(Color.parseColor("#ff0000"));
                                uyarıtext.setVisibility(View.VISIBLE);
                            }
                        }

                        @Override
                        public void onCancelled(@NonNull DatabaseError databaseError) {

                        }
                    });
                }
                else{
                    uyarıtext.setVisibility(View.INVISIBLE);

                }

            }
            else{
                uyarıtext.setVisibility(View.INVISIBLE);
            }
        }

        @Override
        public void afterTextChanged(Editable s) {

        }
    });


        savebutton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.i("1","butona tıklandı");

                    if (usernameedittext.getText().toString().length() > 0 && !usernameedittext.getText().toString().equals(username)) {
                        Log.i("2","yeni username kriterleri uygun");

                        yeni.child(usernameedittext.getText().toString()).addValueEventListener(new ValueEventListener() {
                            @Override
                            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                                if (!dataSnapshot.exists()) {
                                    Log.i("3","kullanıcı adı uygun");

                                    copyRecord(eski, yeni.child(usernameedittext.getText().toString()));
                                    Log.i("15","copyrecord bitti");
                                } else {
                                    uyarıtext.setText(getString(R.string.usernametaken));
                                    uyarıtext.setTextColor(Color.parseColor("#ff0000"));
                                    uyarıtext.setVisibility(View.VISIBLE);
                                }
                            }

                            @Override
                            public void onCancelled(@NonNull DatabaseError databaseError) {

                            }
                        });

                    }

            }

        });


    username.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence text, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence text, int start, int before, int count) {


            if (text.length()>0) {


                database.child("users").child(text.toString()).addValueEventListener(new ValueEventListener() {
                    @Override
                    public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

                        if (!dataSnapshot.exists()) {
                            uyarıtext.setVisibility(View.VISIBLE);
                            uyarıtext.setText(getResources().getString(R.string.youcantakethisusername));
                            uyarıtext.setTextColor(Color.parseColor("#00ff00"));
                        } else {
                            uyarıtext.setVisibility(View.VISIBLE);

    乌亚尔±文本.setText(getResources().getString(R。string.usernametaken)); 

                                uyarıtext.setTextColor(Color.parseColor("#ff0000"));
                        }

                    }

                    @Override
                    public void onCancelled(@NonNull DatabaseError databaseError) {

                    }
                });
            }
            else{
                uyarıtext.setVisibility(View.INVISIBLE);
            }
        }

        @Override
        public void afterTextChanged(Editable s) {

        }
    });



    register.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Log.i("1","butona tıklandı");
            if(namesurname.getText().toString()!=null&&email.getText().toString()!=null&&password.getText().toString()!=null){
                Log.i("2","edittextler boş değil");
                progressDialog.show();
                Log.i("3","propgres gösterildi");
                    database.child("users").child(username.getText().toString()).addValueEventListener(new ValueEventListener() {
                        @Override
                        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                            if (!dataSnapshot.exists()) {
                                Log.i("4","girilen kullanıcı adı alınabilir");
                                if (isValidEmail(email.getText().toString())) {
                                    Log.i("5","e posta geçerli");
                                    auth.createUserWithEmailAndPassword(email.getText().toString(), password.getText().toString()).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                                        @Override
                                        public void onComplete(@NonNull Task<AuthResult> task) {
                                            if (!task.isSuccessful()) {
                                                try {
                                                    throw task.getException();
                                                } catch (FirebaseAuthWeakPasswordException e) {
                                                    uyarıtext.setVisibility(View.VISIBLE);
                                                    progressDialog.hide();
                                                    uyarıtext.setTextColor(Color.parseColor("#ff0000"));
                                                    uyarıtext.setText(getResources().getString(R.string.weakpassword));
                                                } catch (FirebaseAuthInvalidCredentialsException e) {
                                                    uyarıtext.setVisibility(View.VISIBLE);
                                                    progressDialog.hide();
                                                    uyarıtext.setTextColor(Color.parseColor("#ff0000"));
                                                    uyarıtext.setText(getResources().getString(R.string.invalidemail));

                                                } catch (FirebaseAuthUserCollisionException e) {
                                                    uyarıtext.setVisibility(View.VISIBLE);
                                                    progressDialog.hide();
                                                    uyarıtext.setTextColor(Color.parseColor("#ff0000"));
                                                    uyarıtext.setText(getResources().getString(R.string.emailtaken));

                                                } catch (Exception e) {

                                                }
                                            } else {
                                                Log.i("6","kullanıcı oluşturudu");

                                                DatabaseReference ref = database.child("users").child(username.getText().toString());
                                                Log.i("7","username'e refereans oluşturuldu");
                                                DatabaseReference refuidusername = database.child("uidusername").child(auth.getUid());
                                                Log.i("8","uid refereansı oluşturuldu");
                                                refuidusername.setValue(username.getText().toString());
                                                Log.i("9","uidusername değeri yazıldı");
                                                User user = new User();
                                                Log.i("10","yeni user oluşturuldu");
                                                user.setUId(auth.getUid());
                                                Log.i("11","yeni useruid değeri yazıldı");
                                                user.setNamesurname(namesurname.getText().toString());
                                                Log.i("12","yeni user adsoyad değeri yazıldı");
                                                user.setEmail(email.getText().toString());
                                                Log.i("13","yeni user email değeri yazıldı");
                                                ref.setValue(user);
                                                Log.i("14","databse bu yser verileri yüklendi");
                                                progressDialog.hide();
                                                Log.i("15","progresdialog gizlendi");
                                                FragmentTransaction ft = getFragmentManager().beginTransaction();
                                                Log.i("16","gragmenttransaction.getfragmentmanager.begintransaction");
                                                for (int i = 0; i < getFragmentManager().getBackStackEntryCount(); i++) {
                                                    getFragmentManager().popBackStack();

                                                }
                                                Log.i("17","backstack temizlendi");
                                                ft.replace(R.id.mainframe, new MainFragment()).commit();

                                            }
                                        }
                                    });


                                } else {
                                    toast(getResources().getString(R.string.invalidemail));
                                    progressDialog.hide();

                                }

                            } else {
                                uyarıtext.setVisibility(View.VISIBLE);
                                uyarıtext.setText(getResources().getString(R.string.usernametaken));
                                uyarıtext.setTextColor(Color.parseColor("#ff0000"));
                                progressDialog.hide();

                            }
                        }

                        @Override
                        public void onCancelled(@NonNull DatabaseError databaseError) {

                        }
                    });

            }
        }
    });
    1 回复  |  直到 8 年前
        1
  •  0
  •   Alex Mamo    8 年前

    这绝对是 火基问题。错误表明你的 UsernameChangeFragment context ,只需检查活动是否为空: 

    Activity activity = getActivity();
if(activity != null) {
    //Your logic
}

    还有另一种选择,意味着使用 isAdded() 

    if(isAdded()) {
    //Your logic
}
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