給定的String為空或null

Question

匆匆！！ 我在調試方面經驗不足，但是正在努力解決此問題。 對你們來說可能很明顯，但是如果有人可以幫助我，那將是很好

這是錯誤：

2019-03-12 04:12:59.163 17226-17226/com.app.mk.transport E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.app.mk.transport, PID: 17226
    java.lang.IllegalArgumentException: Given String is empty or null
        at com.google.android.gms.common.internal.Preconditions.checkNotEmpty(Unknown Source:11)
        at com.google.firebase.auth.FirebaseAuth.signInWithEmailAndPassword(Unknown Source:0)
        at com.app.mk.transport.MainActivity.showLogInDialog(MainActivity.java:119)
        at com.app.mk.transport.MainActivity.access$100(MainActivity.java:29)
        at com.app.mk.transport.MainActivity$2.onClick(MainActivity.java:65)
        at android.view.View.performClick(View.java:6897)
        at android.widget.TextView.performClick(TextView.java:12693)
        at android.view.View$PerformClick.run(View.java:26101)
        at android.os.Handler.handleCallback(Handler.java:789)
        at android.os.Handler.dispatchMessage(Handler.java:98)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6944)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
2019-03-12 04:12:59.214 17226-17233/com.app.mk.transport I/zygote64: Do partial code cache collection, code=55KB, data=47KB
2019-03-12 04:12:59.215 17226-17233/com.app.mk.transport I/zygote64: After code cache collection, code=55KB, data=47KB
2019-03-12 04:12:59.215 17226-17233/com.app.mk.transport I/zygote64: Increasing code cache capacity to 256KB
2019-03-12 04:12:59.216 17226-17233/com.app.mk.transport I/zygote64: Compiler allocated 9MB to compile void android.widget.TextView.<init>(android.content.Context, android.util.AttributeSet, int, int)

這是我的MainActivity類：

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //Firebase Init
        auth = FirebaseAuth.getInstance();
        db = FirebaseDatabase.getInstance();
        users = db.getReference("Users");

        // Init View
        btnRegister = (Button) findViewById(R.id.btnRegister);
        btnSignIn = (Button) findViewById(R.id.btnSignIn);
        rootLayout = (RelativeLayout) findViewById(R.id.rootLayout);

        //Event
        btnRegister.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showRegisterDialog();
            }
        });

        btnSignIn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showLogInDialog();
            }
        });

    }

    private void showLogInDialog() {
        final AlertDialog.Builder dialog = new AlertDialog.Builder(this);
        dialog.setTitle("SIGN IN ");
        dialog.setMessage("Please use email to sign in!");

        LayoutInflater inflater = LayoutInflater.from(this);

        View layout_login = inflater.inflate(R.layout.layout_login, null);

        final MaterialEditText edtEmail = layout_login.findViewById(R.id.edtEmail);
        final MaterialEditText edtPassword = layout_login.findViewById(R.id.edtPassword);

        dialog.setView(layout_login);

        //set button
        dialog.setPositiveButton("SIGN IN", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                dialogInterface.dismiss();

                btnSignIn.setEnabled(false);

                //Check validation

                if (TextUtils.isEmpty(edtEmail.getText().toString())) {
                    Snackbar.make(rootLayout, "Please enter email address!", Snackbar.LENGTH_SHORT).show();
                    return;
                }

                if (TextUtils.isEmpty(edtPassword.getText().toString())) {
                    Snackbar.make(rootLayout, "Please enter your Password!", Snackbar.LENGTH_SHORT).show();
                    return;
                }

                if (edtPassword.getText().toString().length() < 6) {
                    Snackbar.make(rootLayout, "Password is too short!", Snackbar.LENGTH_SHORT).show();
                    return;
                }
            }

        });


        final SpotsDialog waitingDialog = new SpotsDialog(MainActivity.this, "Loading...", R.style.Orange);

        waitingDialog.show();

        //Login
        auth.signInWithEmailAndPassword(edtEmail.getText().toString(), edtPassword.getText().toString())
                .addOnSuccessListener(new OnSuccessListener<AuthResult>() {
                    @Override
                    public void onSuccess(AuthResult authResult) {
                        waitingDialog.dismiss();
                        startActivity(new Intent(MainActivity.this, Welcome.class));
                        finish();
                    }
                }).addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
                waitingDialog.dismiss();

                Snackbar.make(rootLayout, "Failed " + e.getMessage(), Snackbar.LENGTH_SHORT).show();

                btnSignIn.setEnabled(true);
            }
        });

        dialog.setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                dialogInterface.dismiss();

            }
        });


        dialog.show();
    }

問題是，通過單擊我的“登錄”按鈕，錯誤彈出。 不知道發生了什么。 另一個按鈕“注冊”可以很好地工作，將數據丟入Firebase中，但“登錄”對話框甚至沒有打開。

如果您可以就更改或修復方法給我直接的答案，那對我真的很有幫助。 問候Mitkashin-

Answer 1

您需要在單擊時將登錄代碼移到肯定按鈕中。//登錄

 dialog.setPositiveButton("SIGN IN", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                dialogInterface.dismiss();

                btnSignIn.setEnabled(false);

                //Check validation

                if (TextUtils.isEmpty(edtEmail.getText().toString())) {
                    Snackbar.make(rootLayout, "Please enter email address!", Snackbar.LENGTH_SHORT).show();
                    return;
                }

                if (TextUtils.isEmpty(edtPassword.getText().toString())) {
                    Snackbar.make(rootLayout, "Please enter your Password!", Snackbar.LENGTH_SHORT).show();
                    return;
                }

                if (edtPassword.getText().toString().length() < 6) {
                    Snackbar.make(rootLayout, "Password is too short!", Snackbar.LENGTH_SHORT).show();
                    return;
                }

                auth.signInWithEmailAndPassword(edtEmail.getText().toString(), edtPassword.getText().toString())
                .addOnSuccessListener(new OnSuccessListener<AuthResult>() {
                    @Override
                    public void onSuccess(AuthResult authResult) {
                        waitingDialog.dismiss();
                        startActivity(new Intent(MainActivity.this, Welcome.class));
                        finish();
                    }
                }).addOnFailureListener(new OnFailureListener() {
                   @Override
                   public void onFailure(@NonNull Exception e) {
                      waitingDialog.dismiss();

                      Snackbar.make(rootLayout, "Failed " + e.getMessage(), Snackbar.LENGTH_SHORT).show();

                      btnSignIn.setEnabled(true);
                  }
               });


            }

        });

Answer 2

您將登錄代碼放在錯誤的位置。 您需要將其放入“登錄”按鈕點擊監聽器中，如下所示：

dialog.setPositiveButton("SIGN IN", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialogInterface, int i) {
        dialogInterface.dismiss();

        btnSignIn.setEnabled(false);

        //Check validation

        if (TextUtils.isEmpty(edtEmail.getText().toString())) {
            Snackbar.make(rootLayout, "Please enter email address!", Snackbar.LENGTH_SHORT).show();
            return;
        }

        if (TextUtils.isEmpty(edtPassword.getText().toString())) {
            Snackbar.make(rootLayout, "Please enter your Password!", Snackbar.LENGTH_SHORT).show();
            return;
        }

        if (edtPassword.getText().toString().length() < 6) {
            Snackbar.make(rootLayout, "Password is too short!", Snackbar.LENGTH_SHORT).show();
            return;
        }

        //Login
        auth.signInWithEmailAndPassword(edtEmail.getText().toString(), edtPassword.getText().toString())
            .addOnSuccessListener(new OnSuccessListener<AuthResult>() {
                @Override
                public void onSuccess(AuthResult authResult) {
                    waitingDialog.dismiss();
                    startActivity(new Intent(MainActivity.this, Welcome.class));
                    finish();
                }
            }).addOnFailureListener(new OnFailureListener() {
                @Override
                public void onFailure(@NonNull Exception e) {
                    waitingDialog.dismiss();

                    Snackbar.make(rootLayout, "Failed " + e.getMessage(), Snackbar.LENGTH_SHORT).show();

                    btnSignIn.setEnabled(true);
                }
        });
    }

});

Answer 3

正如其他人所說，您對auth.signInWithEmailAndPassword()調用在錯誤的位置。 您是在構建AlertDialog的方法中調用它的，因此它在您按下按鈕后立即運行，而不是在按下Sign In按鈕時運行。 該對話框未顯示，因為您的應用程序在構建對話框之前就崩潰了。

    java.lang.IllegalArgumentException: Given String is empty or null
    at com.google.android.gms.common.internal.Preconditions.checkNotEmpty(Unknown Source:11)
    at com.google.firebase.auth.FirebaseAuth.signInWithEmailAndPassword(Unknown Source:0)

堆棧跟蹤的前幾行非常清楚地說明了signInWithEmailAndPassword()被賦予了錯誤的參數。 從您的問題中我可以看出，您似乎很急於解決此問題，但請花些時間閱讀和理解這些痕跡。 他們通常非常有幫助