如前所述, Firebase提供了不同类型的身份验证方法。在上一节中, 我们学习了如何使用Firebase UI和Firebase SDK进行身份验证。在本部分中, 我们将学习另一种方法, 即Google登录身份验证。这很容易做到。
开始步骤与我们对其他身份验证方法所做的相同, 如下所示:
- 创建一个Android项目。
- 创建Firebase项目。
- 手动或通过Firebase协助将Firebase添加到Android项目或应用程序。
- 添加所需的库和JSON文件。
步骤1:
除了Firebase身份验证和核心库外, 我们还必须在app.gradle文件中添加Google Play服务身份验证
第2步:
下一步, 我们必须在Firebase控制台中启用Google登录方法。我们还必须添加一个项目支持电子邮件。
第三步:
就像我们以前的方法一样, 我们必须设置SHA-1和SHA-256密钥。
步骤4:
在下一步中, 我们将创建包含三个按钮的布局文件, 这些按钮分别是Google登录, 退出以及退出和断开连接。活动布局如下所示:
步骤5:
现在, 我们将修改MainActivity.java文件以通过以下方式执行Google登录身份验证:
//Implement OnClickListener for sign-in button
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
//Adding tag for logging and RC_SIGN_IN for an activity result
private static final String TAG = "GoogleActivity";
private static final int RC_SIGN_IN = 9001;
// Adding Google sign-in client
GoogleSignInClient mGoogleSignInClient;
//Creating member variable for FirebaseAuth
private FirebaseAuth mAuth;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Adding buttons to the OnClickListener
findViewById(R.id.sign_in_button).setOnClickListener(this);
findViewById(R.id.signOutButton).setOnClickListener(this);
findViewById(R.id.disconnectButton).setOnClickListener(this);
//Building Google sign-in and sign-up option.
// Configuring Google Sign In
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
// for the requestIdToken, use getString(R.string.default_web_client_id), this is in the values.xml file that
// is generated from your google-services.json file (data from your firebase project), uses the google-sign-in method
// web api key
.requestIdToken(getString(R.string.default_web_client_id))//Default_web_client_id will be matched with the
.requestEmail()
.build();
// Build a GoogleSignInClient with the options specified by gso.
mGoogleSignInClient = GoogleSignIn.getClient(this, gso);
// Set the dimensions of the sign-in button.
SignInButton signInButton = findViewById(R.id.sign_in_button);
signInButton.setSize(SignInButton.SIZE_WIDE);
// Initialize Firebase Auth
mAuth = FirebaseAuth.getInstance();
}
//Creating onStart() method.
@Override
public void onStart() {
super.onStart();
// Checking if the user is signed in (non-null) and update UI accordingly.
FirebaseUser currentUser = mAuth.getCurrentUser();
if (currentUser != null) {
Log.d(TAG, "Currently Signed in: " + currentUser.getEmail());
Toast.makeText(MainActivity.this, "Currently Logged in: " + currentUser.getEmail(), Toast.LENGTH_LONG).show();
}
}
//Calling onActivityResult to use the information about the sign-in user contains in the object.
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
if (requestCode == RC_SIGN_IN) {
Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
try {
// Google Sign In was successful, authenticate with Firebase
GoogleSignInAccount account = task.getResult(ApiException.class);
Toast.makeText(this, "Google Sign in Succeeded", Toast.LENGTH_LONG).show();
firebaseAuthWithGoogle(account);
} catch (ApiException e) {
// Google Sign In failed, update UI appropriately
Log.w(TAG, "Google sign in failed", e);
Toast.makeText(this, "Google Sign in Failed " + e, Toast.LENGTH_LONG).show();
}
}
}
//Creating helper method FirebaseAuthWithGoogle().
private void firebaseAuthWithGoogle(GoogleSignInAccount acct) {
Log.d(TAG, "firebaseAuthWithGoogle:" + acct.getId());
//Calling get credential from the oogleAuthProviderG
AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
mAuth.signInWithCredential(credential)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
//Override th onComplete() to see we are successful or not.
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (task.isSuccessful()) {
// Update UI with the sign-in user's information
FirebaseUser user = mAuth.getCurrentUser();
Log.d(TAG, "signInWithCredential:success: currentUser: " + user.getEmail());
Toast.makeText(MainActivity.this, "Firebase Authentication Succeeded ", Toast.LENGTH_LONG).show();
} else {
// If sign-in fails to display a message to the user.
Log.w(TAG, "signInWithCredential:failure", task.getException());
Toast.makeText(MainActivity.this, "Firebase Authentication failed:" + task.getException(), Toast.LENGTH_LONG).show();
}
}
});
}
public void signInToGoogle(){
//Calling Intent and call startActivityForResult() method
Intent signInIntent = mGoogleSignInClient.getSignInIntent();
startActivityForResult(signInIntent, RC_SIGN_IN);
}
private void signOut() {
// Firebase sign out
FirebaseAuth.getInstance().signOut();
// Google sign out
mGoogleSignInClient.signOut().addOnCompleteListener(this, new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
// Google Sign In failed, update UI appropriately
Toast.makeText(getApplicationContext(), "Signed out of google", Toast.LENGTH_SHORT).show();
}
});
}
private void revokeAccess() {
// Firebase sign out
FirebaseAuth.getInstance().signOut();
// Google revoke access
mGoogleSignInClient.revokeAccess().addOnCompleteListener(this, new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
// Google Sign In failed, update UI appropriately
Log.w(TAG, "Revoked Access");
}
});
}
@Override
public void onClick(View v) {
int i = v.getId();
if (i == R.id.sign_in_button) {
Adding signInToGoogle() method
signInToGoogle();
}
else if (i == R.id.signOutButton) {
signOut();
}
else if (i == R.id.disconnectButton) {
revokeAccess();
}
}
@Override
public void onPointerCaptureChanged(boolean hasCapture) {
}
}
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