Question

我正在学习如何使用Firebase身份验证并将用户数据放入Firebase。当我按下故意将我从CreateAccountActivity带到第二个设置活动的编码按钮时，应用程序崩溃。我的代码有什么问题？

当我注释掉AccountSetupActivity中的所有代码时，活动启动正常。但是，当我将代码放回AccountSetupActivity时，它每次启动都会崩溃。

CreateAccountActivity @Override 受保护的void onCreate（Bundle savedInstanceState）{ super.onCreate（savedInstanceState）; setContentView（R.layout.createaccount_activity）;

    mAuth = FirebaseAuth.getInstance();

    userId = (EditText) findViewById(...);
    userPassword = (EditText) findViewById(...);
    confirmPassword = (EditText) findViewById(....);

    createAccount = (Button) findViewById(...);
    createAccount.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            createAccount();
        }
    });


}

private void createAccount() {
    String uID = userId.getText().toString();
    String uPW = userPassword.getText().toString();
    String confirmPW = confirmPassword.getText().toString();

    if(TextUtils.isEmpty(uID) || TextUtils.isEmpty(uPW) || TextUtils.isEmpty(confirmPW)){
        return;
    }

    if(uPW.length()<6){
        return;
    }

    if(!uPW.equals(confirmPW))
        return;
    }

    mAuth.createUserWithEmailAndPassword(uID, uPW).addOnCompleteListener(CreateAccountActivity.this, new OnCompleteListener<AuthResult>() {
        @Override
        public void onComplete(@NonNull Task<AuthResult> task) {
            if (task.isSuccessful()){
                sendUserInitialSetupActivity();
            }else{
                Toast.makeText(getApplicationContext(),"E-mail or password is wrong",Toast.LENGTH_SHORT).show();
            }
        }
    });



}

private void sendUserInitialSetupActivity() {
    Intent intent = new Intent(CreateAccountActivity.this, InitialAccountSetupActivity.class);
    startActivity(intent);
    finish();
}

SetupAccountActivity @Override 受保护的void onCreate（Bundle savedInstanceState）{ super.onCreate（savedInstanceState）; setContentView（R.layout.activity_initial_account_setup）;

    mAuth = FirebaseAuth.getInstance();
    currentUserID = mAuth.getCurrentUser().getUid();


    userRef = FirebaseDatabase.getInstance().getReference().child("Users").child(currentUserID);


    setImage = (ImageView) findViewById(...);
    setDisplayName = (EditText) findViewById(...);
    setBirthDate = (EditText) findViewById(...);
    confirmButton = (Button) findViewById(...);



    confirmButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            confirmAccount();
        }
    });
}




private void confirmAccount() {
    String displayName = setDisplayName.getText().toString();
    String birthDate = setBirthDate.getText().toString();

    if(displayName.isEmpty() || birthDate.isEmpty()){
        return;
    }

    HashMap userMap = new HashMap();
    userMap.put("displayName", displayName);
    userMap.put("birthDate", birthDate);


    userRef.updateChildren(userMap).addOnCompleteListener(new OnCompleteListener() {
        @Override
        public void onComplete(@NonNull Task task) {
            if(task.isSuccessful()){
                sendUserHomeActivity();
            }
            else{
                Toast.makeText(InitialAccountSetupActivity.this, "Error occured", Toast.LENGTH_SHORT).show();
            }
        }
    });


}

private void sendUserHomeActivity() {
    Intent intent = new Intent(InitialAccountSetupActivity.this, HomeActivity.class);
    startActivity(intent);

}

2019-07-19 16：46：22.360 11701-11701 / android.example.firebasetest E / AndroidRuntime：FATAL EXCEPTION：main 流程：android.example.firebasetest，PID：11701 java.lang.RuntimeException：无法启动活动ComponentInfo {android.example.firebasetest / android.example.firebasetest.InitialAccountSetupActivity}：java.lang.NullPointerException：尝试调用虚拟方法'com.google.firebase.auth.FirebaseUser com。 google.firebase.auth.FirebaseAuth.getCurrentUser（）”上的空对象引用在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:3260）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:3396）在android.app.servertransaction.LaunchActivityItem.execute（LaunchActivityItem.java:83）在android.app.servertransaction.TransactionExecutor.executeCallbacks（TransactionExecutor.java:135）在android.app.servertransaction.TransactionExecutor.execute（TransactionExecutor.java:95）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:2009）在android.os.Handler.dispatchMessage（Handler.java:107）在android.os.Looper.loop（Looper.java:214）在android.app.ActivityThread.main（ActivityThread.java:7319）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run（RuntimeInit.java:492）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:934）引起原因：java.lang.NullPointerException：尝试在空对象引用上调用虚拟方法“ com.google.firebase.auth.FirebaseUser com.google.firebase.auth.FirebaseAuth.getCurrentUser（）” 在android.example.firebasetest.InitialAccountSetupActivity.onCreate（InitialAccountSetupActivity.java:42）在android.app.Activity.performCreate（Activity.java:7783）在android.app.Activity.performCreate（Activity.java:7772）在android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1299）在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:3235）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:3396）在android.app.servertransaction.LaunchActivityItem.execute（LaunchActivityItem.java:83）在android.app.servertransaction.TransactionExecutor.executeCallbacks（TransactionExecutor.java:135）在android.app.servertransaction.TransactionExecutor.execute（TransactionExecutor.java:95）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:2009）在android.os.Handler.dispatchMessage（Handler.java:107）在android.os.Looper.loop（Looper.java:214）在android.app.ActivityThread.main（ActivityThread.java:7319）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run（RuntimeInit.java:492）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:934）

启动其他活动时应用崩溃，可能是由于Firebase

0 个答案: