[英]Disable Button When EditText Is Empty Android Studio?
我是新人,没有经验。 我看到了一些禁用登录按钮的代码。 我试图将它添加到代码中。 但我没有成功。 当字段为空时,按下登录按钮时应用程序停止。
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = ActivityLoginBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());
auth = FirebaseAuth.getInstance();
dialog = new ProgressDialog(this);
dialog.setMessage("Logging in...");
if(auth.getCurrentUser() != null) {
startActivity(new Intent(LoginActivity.this, MainActivity.class));
finish();
}
binding.submitBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String email, pass;
email = binding.emailBox.getText().toString();
pass = binding.passwordBox.getText().toString();
dialog.show();
auth.signInWithEmailAndPassword(email, pass).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
dialog.dismiss();
if(task.isSuccessful()) {
startActivity(new Intent(LoginActivity.this, MainActivity.class));
finish();
} else {
Toast.makeText(LoginActivity.this, task.getException().getLocalizedMessage(), Toast.LENGTH_SHORT).show();
}
}
});
}
});
binding.createNewBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(LoginActivity.this, SignupActivity.class));
}
});
}
}
您应该检查email
pattern 和password
,而不仅仅是检查空字段,还应该检查 length > 6 否则Firebase Auth
会抛出异常。 为您的submitBtn
侦听器使用以下代码:
binding.submitBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String email = binding.emailBox.getText().toString();
String pass = binding.passwordBox.getText().toString();
if (email.isEmpty()) {
binding.emailBox.setError("Email is required");
binding.emailBox.requestFocus();
return;
}
if (!Patterns.EMAIL_ADDRESS.matcher(email).matches()) {
binding.emailBox.setError("Email is not valid");
binding.emailBox.requestFocus();
return;
}
if (pass.isEmpty()) {
binding.passwordBox.setError("Password is required");
binding.passwordBox.requestFocus();
return;
}
if (pass.length() < 6) {
binding.passwordBox.setError("Password is weak");
binding.passwordBox.requestFocus();
return;
}
dialog.show();
auth.signInWithEmailAndPassword(email, pass).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
dialog.dismiss();
if(task.isSuccessful()) {
startActivity(new Intent(LoginActivity.this, MainActivity.class));
finish();
} else {
Toast.makeText(LoginActivity.this, task.getException().getLocalizedMessage(), Toast.LENGTH_SHORT).show();
}
}
});
}
});
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