我是这个领域的新手。我想用电子邮件和密码实现Firebase登录并将该用户的一些数据(硬币)存储在该用户的Firebase数据库中。我要建立登录和注册以及主要活动。在主要活动中,文本显示Firebase的硬币。该用户的UUID中的硬币。还有一个初始屏幕,如果用户登录,它将重定向到主要活动,并且主要活动检查uuid并显示该用户硬币。
FirebaseUser currentUser;
String UID;
FirebaseAuth mAuth;
DatabaseReference databaseReference;
mAuth = FirebaseAuth.getInstance();
currentUser = mAuth.getCurrentUser();
databaseReference = FirebaseDatabase.getInstance().getReference().child("Users");
if (currentUser != null) { //Check if the user is logged in or not
String uid = currentUser.getUid(); //Get the UID of user
HashMap<String, Object> map = new HashMap<>();
map.put("coins", coins);
//map.put("uid", uid); //add other data you want to upload
databaseReference.child(uid).setValue(map);
}
如果要使用UUID代替uid,请使用:
String uuid = UUID.randomUUID().toString();
登录
这里是firebase auth的官方文档-https://firebase.google.com/docs/auth/android/google-signin
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestIdToken(getString(R.string.default_web_client_id))
.requestEmail()
.build();
mGoogleSignInClient = GoogleSignIn.getClient(this, gso);
signInButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
signIn();
}
});
private void signIn() {
Intent signInIntent = mGoogleSignInClient.getSignInIntent();
startActivityForResult(signInIntent, RC_SIGN_IN);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == RC_SIGN_IN) {
Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
handleSignIn(task);
}
}
private void handleSignIn(Task<GoogleSignInAccount> completedTask) {
try {
// Google Sign In was successful, authenticate with Firebase
GoogleSignInAccount account = completedTask.getResult(ApiException.class);
Toast.makeText(this, "success", Toast.LENGTH_SHORT).show();
assert account != null;
firebaseAuthWithGoogle(account);
} catch (ApiException e) {
// Google Sign In failed, update UI appropriately
Log.e("TAG_failure", "Google sign in failed");
Toast.makeText(this, "Failed", Toast.LENGTH_SHORT).show();
}
}
private void firebaseAuthWithGoogle(GoogleSignInAccount acct) {
AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
mAuth.signInWithCredential(credential)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (task.isSuccessful()) {
Log.d("TAG_S", "signInWithCredential:success");
} else {
// If sign in fails, display a message to the user.
Log.e("TAG_F", "signInWithCredential:failure", task.getException());
}
}
});
}