问题
Wonder why can't start the mAuth.signInWithEmailAndPassword() inside my onClick() button as I've done before. Should i call it another way? but how, It's not much of information out there yet about the new version.
Currently it gives be the error String is empty or null:
Process: com.example.rasmusjosefsson.rjcar, PID: 30563 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.rasmusjosefsson.rjcar/com.example.rasmusjosefsson.rjcar.LoginAndSignUp.LoginActivity}: java.lang.IllegalArgumentException: Given String is empty or null at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) at android.app.ActivityThread.-wrap11(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) Caused by: java.lang.IllegalArgumentException: Given String is empty or null at com.google.android.gms.common.internal.zzaa.zzdl(Unknown Source) at com.google.firebase.auth.FirebaseAuth.signInWithEmailAndPassword(Unknown Source) at com.example.rasmusjosefsson.rjcar.LoginAndSignUp.LoginActivity.onCreate(LoginActivity.java:77) at android.app.Activity.performCreate(Activity.java:6237) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) at android.app.ActivityThread.-wrap11(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148)
i guess it's because of the mAuth.signInWithEmailAndPassword(email, password) without any initiated String.
and therefor will be called immediately inside onCreate().
public class LoginActivity extends AppCompatActivity {
protected EditText emailEditText;
protected EditText passwordEditText;
protected Button loginButton;
protected TextView signUpTextView;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;
// Currently
private String email;
private String password;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
// Setting up the Views
signUpTextView = (TextView) findViewById(R.id.signUpText);
emailEditText = (EditText) findViewById(R.id.emailField);
passwordEditText = (EditText) findViewById(R.id.passwordField);
loginButton = (Button) findViewById(R.id.loginButton);
// Getting the firebase reference url
final DatabaseReference ref = FirebaseDatabase.getInstance().getReference();
mAuth = FirebaseAuth.getInstance();
loginButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Retrieves user inputs
email = emailEditText.getText().toString();
password = passwordEditText.getText().toString();
// trims the input
email = email.trim();
password = password.trim();
}
});
// When a user signs in to your app, pass the user's email address and password to signInWithEmailAndPassword
mAuth.signInWithEmailAndPassword(email, password)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
Log.d("TAG", "signInWithEmail:onComplete:" + task.isSuccessful());
// If sign in fails, display a message to the user. If sign in succeeds
// the auth state listener will be notified and logic to handle the
// signed in user can be handled in the listener.
if (!task.isSuccessful()) {
Log.w("TAG", "signInWithEmail", task.getException());
Toast.makeText(LoginActivity.this, "Authentication failed.",
Toast.LENGTH_SHORT).show();
}
}
});
// responds to changes in the user's sign-in state
mAuthListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
FirebaseUser user = firebaseAuth.getCurrentUser();
if (user != null) {
// User is signed in
Log.d("TAG", "onAuthStateChanged:signed_in:" + user.getUid());
// Authenticated successfully with authData
Intent intent = new Intent(LoginActivity.this, MainRealBack2.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
} else {
// User is signed out
Log.d("TAG", "onAuthStateChanged:signed_out");
}
}
};
}
@Override
public void onStart() {
super.onStart();
mAuth.addAuthStateListener(mAuthListener);
}
@Override
public void onStop() {
super.onStop();
if (mAuthListener != null) {
mAuth.removeAuthStateListener(mAuthListener);
}
}
}
My activity:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mainrealback2);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
if (user != null) {
// User is signed in
mUserId = user.getUid();
} else {
// No user is signed in
loadLoginView();
}
waypointsUrl = Constants.FIREBASE_URL + "/users/" + mUserId + "/waypoints";
mainRef = FirebaseDatabase.getInstance().getReferenceFromUrl(waypointsUrl);
UPDATE
回答1:
SOLUTION
To get .addOnCompleteListener() work inside setOnClickListener
.addOnCompleteListener() needed to be declared with classname.this
mAuth.signInWithEmailAndPassword(email, password)
.addOnCompleteListener(LoginActivity.this, new OnCompleteListener<AuthResult>() {
Final solution
public class LoginActivity extends AppCompatActivity {
protected EditText emailEditText;
protected EditText passwordEditText;
protected Button loginButton;
protected TextView signUpTextView;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;
// Currently
private String email;
private String password;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
// Setting up the Views
signUpTextView = (TextView) findViewById(R.id.signUpText);
emailEditText = (EditText) findViewById(R.id.emailField);
passwordEditText = (EditText) findViewById(R.id.passwordField);
loginButton = (Button) findViewById(R.id.loginButton);
// Getting the firebase reference url
final DatabaseReference ref = FirebaseDatabase.getInstance().getReference();
mAuth = FirebaseAuth.getInstance();
loginButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Retrieves user inputs
email = emailEditText.getText().toString();
password = passwordEditText.getText().toString();
// trims the input
email = email.trim();
password = password.trim();
// When a user signs in to your app, pass the user's email address and password to signInWithEmailAndPassword
mAuth.signInWithEmailAndPassword(email, password)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
Log.d("TAG", "signInWithEmail:onComplete:" + task.isSuccessful());
// If sign in fails, display a message to the user. If sign in succeeds
// the auth state listener will be notified and logic to handle the
// signed in user can be handled in the listener.
if (!task.isSuccessful()) {
Log.w("TAG", "signInWithEmail", task.getException());
Toast.makeText(LoginActivity.this, "Authentication failed.",
Toast.LENGTH_SHORT).show();
}
}
});
}
});
// responds to changes in the user's sign-in state
mAuthListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
FirebaseUser user = firebaseAuth.getCurrentUser();
if (user != null) {
// User is signed in
Log.d("TAG", "onAuthStateChanged:signed_in:" + user.getUid());
// Authenticated successfully with authData
Intent intent = new Intent(LoginActivity.this, MainRealBack2.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
} else {
// User is signed out
Log.d("TAG", "onAuthStateChanged:signed_out");
}
}
};
}
@Override
public void onStart() {
super.onStart();
mAuth.addAuthStateListener(mAuthListener);
}
@Override
public void onStop() {
super.onStop();
if (mAuthListener != null) {
mAuth.removeAuthStateListener(mAuthListener);
}
}
}
回答2:
You are calling mAuth.signInWithEmailAndPassword() inside onCreate() right away. You need to move it into your onClickListener.
loginButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Retrieves user inputs
email = emailEditText.getText().toString();
password = passwordEditText.getText().toString();
// trims the input
email = email.trim();
password = password.trim();
mAuth.signInWithEmailAndPassword(email, password)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
Log.d("TAG", "signInWithEmail:onComplete:" + task.isSuccessful());
// If sign in fails, display a message to the user. If sign in succeeds
// the auth state listener will be notified and logic to handle the
// signed in user can be handled in the listener.
if (!task.isSuccessful()) {
Log.w("TAG", "signInWithEmail", task.getException());
Toast.makeText(LoginActivity.this, "Authentication failed.",
Toast.LENGTH_SHORT).show();
}
}
});
}
});
来源：https://stackoverflow.com/questions/37352871/firebase-9-0-0-mauth-signinwithemailandpassword-how-to-pass-it-to-a-button