Java 无法为child（）firebase错误中的参数“pathString”传递null

这是代码，当我想获取用户密钥getPhone时我有问题，我不能，因为获取null值我是编程新手

    LayoutInflater inflater = LayoutInflater.from(this);
    View layout_pwd = inflater.inflate(R.layout.ganti_password_layout,null);

    final MaterialEditText edtPassword = (MaterialEditText)layout_pwd.findViewById(R.id.gantiPassword);
    final MaterialEditText edtNewPassword = (MaterialEditText)layout_pwd.findViewById(R.id.gantiPasswordBaru);
    final MaterialEditText edtRepeatPassword = (MaterialEditText)layout_pwd.findViewById(R.id.gantiPasswordBaruUlang);

    alertDialog.setView(layout_pwd);

    //Button
    alertDialog.setPositiveButton("GANTI", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {
            //Ganti Password Disini
            final android.app.AlertDialog waitingDialog = new SpotsDialog(Home.this);
            waitingDialog.show();

            //cek password lama
            if(edtPassword.getText().toString().equals(Common.currentUser.getPassword()))
            {
                //Cek Password Baru dan Ulang Password
                if(edtNewPassword.getText().toString().equals(edtRepeatPassword.getText().toString()))
                {
                    Map<String,Object> passwordUpdate = new HashMap<>();
                    passwordUpdate.put("password",edtNewPassword.getText().toString());

                    //Update
                    DatabaseReference user = FirebaseDatabase.getInstance().getReference("User");
                    user.child(Common.currentUser.getPhone())
                            .updateChildren(passwordUpdate)
                            .addOnCompleteListener(new OnCompleteListener<Void>() {
                                @Override
                                public void onComplete(@NonNull Task<Void> task) {
                                    waitingDialog.dismiss();
                                    Toast.makeText(Home.this, "Password Telah Diganti", Toast.LENGTH_SHORT).show();
                                }
                            })
                            .addOnFailureListener(new OnFailureListener() {
                                @Override
                                public void onFailure(@NonNull Exception e) {
                                    Toast.makeText(Home.this, e.getMessage(), Toast.LENGTH_SHORT).show();
                                }
                            });
                }
                else
                {
                    waitingDialog.dismiss();
                    Toast.makeText(Home.this, "Pengulangan Password Tidak Sesuai", Toast.LENGTH_SHORT).show();
                }
            }
            else
            {
                waitingDialog.dismiss();
                Toast.makeText(Home.this, "Password Lama Salah", Toast.LENGTH_SHORT).show();
            }

        }
    });

---

存在此问题是因为方法Common.currentUser.getPhone返回null

要修复它，只需在子方法调用之前添加简单的null测试

像这样：

String phone = Common.currentUser.getPhone();
if (phone != null)
    user.child(phone)
                            .updateChildren(passwordUpdate)
                            .addOnCompleteListener(new OnCompleteListener<Void>() {
                                @Override
                                public void onComplete(@NonNull Task<Void> task) {
                                    waitingDialog.dismiss();
                                    Toast.makeText(Home.this, "Password Telah Diganti", Toast.LENGTH_SHORT).show();
                                }
                            })
                            .addOnFailureListener(new OnFailureListener() {
                                @Override
                                public void onFailure(@NonNull Exception e) {
                                    Toast.makeText(Home.this, e.getMessage(), Toast.LENGTH_SHORT).show();
                                }
                            });
else {
    // do something else here
}

---

或者编辑getPhone方法，使其永远不会返回null

NullPointerException请添加将用户和密码添加到Common.currentUser的代码？我在第一篇文章中已经添加了该代码，希望您可以帮助Stack和我的应用程序不做任何事情，只需加载

String phone = Common.currentUser.getPhone();
if (phone != null)
    user.child(phone)
                            .updateChildren(passwordUpdate)
                            .addOnCompleteListener(new OnCompleteListener<Void>() {
                                @Override
                                public void onComplete(@NonNull Task<Void> task) {
                                    waitingDialog.dismiss();
                                    Toast.makeText(Home.this, "Password Telah Diganti", Toast.LENGTH_SHORT).show();
                                }
                            })
                            .addOnFailureListener(new OnFailureListener() {
                                @Override
                                public void onFailure(@NonNull Exception e) {
                                    Toast.makeText(Home.this, e.getMessage(), Toast.LENGTH_SHORT).show();
                                }
                            });
else {
    // do something else here
}