我正在使用下面的代码使用电子邮件和密码登录用户，但我在 java 方面并不那么先进。我正在尝试循环任务异常，直到用户成功。
public void userLogin() {
String email = etEmail.getText().toString().trim();
final String password = etPassword.getText().toString().trim();
if(TextUtils.isEmpty(email)){
//email is empty
Toast.makeText(this, "Please enter email", Toast.LENGTH_SHORT).show();
return ;
}
if(TextUtils.isEmpty(password)){
//password is empty
Toast.makeText(this, "Please enter password", Toast.LENGTH_SHORT).show();
return ;
}
progressDialog.setMessage("Login Please wait...");
progressDialog.show();
firebaseAuth.signInWithEmailAndPassword(email,password)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
progressDialog.dismiss();
performTask();
}
});
}
public void performTask() {
Task task = onComplete(@NonNull Task<AuthResult> task);
if (task.isSuccessful()) {
finish();
userVerified();
} else {
String errorCode = ((FirebaseAuthException) task.getException()).getErrorCode();
switch (errorCode) {
case "ERROR_INVALID_EMAIL":
Toast.makeText(Signin.this, "The email address is badly formatted.", Toast.LENGTH_LONG).show();
etEmail.setError("The email address is badly formatted.");
etEmail.requestFocus();
break;
case "ERROR_WRONG_PASSWORD":
Toast.makeText(Signin.this, "The password is invalid ", Toast.LENGTH_LONG).show();
etPassword.setError("password is incorrect ");
etPassword.requestFocus();
etPassword.setText("");
break;
case "ERROR_USER_MISMATCH":
Toast.makeText(Signin.this, "The supplied credentials do not correspond to the previously signed in user.", Toast.LENGTH_LONG).show();
break;
case "ERROR_REQUIRES_RECENT_LOGIN":
Toast.makeText(Signin.this, "This operation is sensitive and requires recent authentication. Log in again before retrying this request.", Toast.LENGTH_LONG).show();
break;
case "ERROR_ACCOUNT_EXISTS_WITH_DIFFERENT_CREDENTIAL":
Toast.makeText(Signin.this, "An account already exists with the same email address but different sign-in credentials. Sign in using a provider associated with this email address.", Toast.LENGTH_LONG).show();
break;
case "ERROR_EMAIL_ALREADY_IN_USE":
Toast.makeText(Signin.this, "The email address is already in use by another account. ", Toast.LENGTH_LONG).show();
etEmail.setError("The email address is already in use by another account.");
etEmail.requestFocus();
break;
case "ERROR_USER_NOT_FOUND":
Toast.makeText(Signin.this, "Your account not registered", Toast.LENGTH_LONG).show();
break;
}
performTask();
}
}
当我尝试这个循环时，应用程序将停止。我尝试让应用程序不会崩溃。我不知道我想在 Task task = getTask(); 中放入什么；
最佳答案
我相信递归将是解决您的问题的一个很好的解决方案，如下所示。假设您从某个 API 获取 task(让 getTaskDetails();)。然后，每次出现错误时，使用现有的 switch case 显示错误，然后再次调用方法 performTask() 再次执行任务并执行相同的逻辑，直到未收到正确的详细信息或任务不成功。
public void userLogin() {
String email = etEmail.getText().toString().trim();
final String password = etPassword.getText().toString().trim();
if(TextUtils.isEmpty(email)){
//email is empty
Toast.makeText(this, "Please enter email", Toast.LENGTH_SHORT).show();
return ;
}
if(TextUtils.isEmpty(password)){
//password is empty
Toast.makeText(this, "Please enter password", Toast.LENGTH_SHORT).show();
return ;
}
progressDialog.setMessage("Login Please wait...");
progressDialog.show();
firebaseAuth.signInWithEmailAndPassword(email,password)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
progressDialog.dismiss();
performTask(task);
}
});
}
public void performTask(Task<AuthResult> task) {
if (task.isSuccessful()) {
finish();
userVerified();
} else {
String errorCode = ((FirebaseAuthException) task.getException()).getErrorCode();
switch (errorCode) {
case "ERROR_INVALID_EMAIL":
Toast.makeText(Signin.this, "The email address is badly formatted.", Toast.LENGTH_LONG).show();
etEmail.setError("The email address is badly formatted.");
etEmail.requestFocus();
break;
case "ERROR_WRONG_PASSWORD":
Toast.makeText(Signin.this, "The password is invalid ", Toast.LENGTH_LONG).show();
etPassword.setError("password is incorrect ");
etPassword.requestFocus();
etPassword.setText("");
break;
case "ERROR_USER_MISMATCH":
Toast.makeText(Signin.this, "The supplied credentials do not correspond to the previously signed in user.", Toast.LENGTH_LONG).show();
break;
case "ERROR_REQUIRES_RECENT_LOGIN":
Toast.makeText(Signin.this, "This operation is sensitive and requires recent authentication. Log in again before retrying this request.", Toast.LENGTH_LONG).show();
break;
case "ERROR_ACCOUNT_EXISTS_WITH_DIFFERENT_CREDENTIAL":
Toast.makeText(Signin.this, "An account already exists with the same email address but different sign-in credentials. Sign in using a provider associated with this email address.", Toast.LENGTH_LONG).show();
break;
case "ERROR_EMAIL_ALREADY_IN_USE":
Toast.makeText(Signin.this, "The email address is already in use by another account. ", Toast.LENGTH_LONG).show();
etEmail.setError("The email address is already in use by another account.");
etEmail.requestFocus();
break;
case "ERROR_USER_NOT_FOUND":
Toast.makeText(Signin.this, "Your account not registered", Toast.LENGTH_LONG).show();
break;
}
userLogin();
}
}
关于java - 如何循环异常直到用户成功或错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/58345437/