我正在尝试让我的用户选择使用 Google 或 Facebook 登录。到目前为止，我找到了一个实现 Google 登录流程的示例，但我很困惑是否可以在同一个 Activity 中实现类似的 Facebook 登录流程。
任何人都有处理登录的想法？我正在考虑可能定义一个类来处理 Google / Facebook 的登录流程，也许只是检查应用程序启动时正在使用哪个。有任何想法吗？
public class MainActivity extends Activity implements ConnectionCallbacks,
OnConnectionFailedListener, OnClickListener, OnAccessRevokedListener {
private static final String TAG = "MainActivity";
// A magic number we will use to know that our sign-in error
// resolution activity has completed.
private static final int OUR_REQUEST_CODE = 49404;
// The core Google+ client.
private PlusClient mPlusClient;
// A flag to stop multiple dialogues appearing for the user.
private boolean mResolveOnFail;
// We can store the connection result from a failed connect()
// attempt in order to make the application feel a bit more
// responsive for the user.
private ConnectionResult mConnectionResult;
// A progress dialog to display when the user is connecting in
// case there is a delay in any of the dialogs being ready.
private ProgressDialog mConnectionProgressDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
// We pass through this for all three arguments, specifying the:
// 1. Context
// 2. Object to call onConnected and onDisconnected on
// 3. Object to call onConnectionFailed on
mPlusClient = new PlusClient.Builder(this, this, this)
.setVisibleActivities("http://schemas.google.com/BuyActivity")
.build();
// We use mResolveOnFail as a flag to say whether we should trigger
// the resolution of a connectionFailed ConnectionResult.
mResolveOnFail = false;
// Connect our sign in, sign out and disconnect buttons.
findViewById(R.id.sign_in_button).setOnClickListener(this);
findViewById(R.id.sign_out_button).setOnClickListener(this);
findViewById(R.id.sign_out_button).setVisibility(View.GONE);
findViewById(R.id.authButton).setOnClickListener(this);
// Configure the ProgressDialog that will be shown if there is a
// delay in presenting the user with the next sign in step.
mConnectionProgressDialog = new ProgressDialog(this);
mConnectionProgressDialog.setMessage("Signing in...");
}
@Override
protected void onStart() {
super.onStart();
Log.v(TAG, "Start");
// Every time we start we want to try to connect. If it
// succeeds we'll get an onConnected() callback. If it
// fails we'll get onConnectionFailed(), with a result!
mPlusClient.connect();
}
@Override
protected void onStop() {
super.onStop();
Log.v(TAG, "Stop");
// It can be a little costly to keep the connection open
// to Google Play Services, so each time our activity is
// stopped we should disconnect.
mPlusClient.disconnect();
}
@Override
public void onConnectionFailed(ConnectionResult result) {
Log.v(TAG, "ConnectionFailed");
// Most of the time, the connection will fail with a
// user resolvable result. We can store that in our
// mConnectionResult property ready for to be used
// when the user clicks the sign-in button.
if (result.hasResolution()) {
mConnectionResult = result;
if (mResolveOnFail) {
// This is a local helper function that starts
// the resolution of the problem, which may be
// showing the user an account chooser or similar.
startResolution();
}
}
}
@Override
public void onConnected(Bundle bundle) {
// Yay! We can get the oAuth 2.0 access token we are using.
Log.v(TAG, "Connected. Yay!");
// Turn off the flag, so if the user signs out they'll have to
// tap to sign in again.
mResolveOnFail = false;
// Hide the progress dialog if its showing.
mConnectionProgressDialog.dismiss();
// Hide the sign in button, show the sign out buttons.
findViewById(R.id.sign_in_button).setVisibility(View.GONE);
findViewById(R.id.sign_out_button).setVisibility(View.VISIBLE);
// Retrieve the oAuth 2.0 access token.
final Context context = this.getApplicationContext();
AsyncTask task = new AsyncTask() {
@Override
protected Object doInBackground(Object... params) {
String scope = "oauth2:" + Scopes.PLUS_LOGIN;
try {
// We can retrieve the token to check via
// tokeninfo or to pass to a service-side
// application.
String token = GoogleAuthUtil.getToken(context,
mPlusClient.getAccountName(), scope);
} catch (UserRecoverableAuthException e) {
// This error is recoverable, so we could fix this
// by displaying the intent to the user.
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (GoogleAuthException e) {
e.printStackTrace();
}
return null;
}
};
task.execute((Void) null);
// THIS IS TO CONNECT TO NAVI ACTIVITY AFTER YOU CONNECT Also makes it
// so you cannot go back to main activity
/*
* if (mPlusClient.isConnected()) { Intent intent = new Intent(this,
* NaviActivity.class); startActivity(intent); } finish();
*/
}
@Override
public void onDisconnected() {
// Bye!
Log.v(TAG, "Disconnected. Bye!");
}
protected void onActivityResult(int requestCode, int responseCode,
Intent intent) {
Log.v(TAG, "ActivityResult: " + requestCode);
if (requestCode == OUR_REQUEST_CODE && responseCode == RESULT_OK) {
// If we have a successful result, we will want to be able to
// resolve any further errors, so turn on resolution with our
// flag.
mResolveOnFail = true;
// If we have a successful result, lets call connect() again. If
// there are any more errors to resolve we'll get our
// onConnectionFailed, but if not, we'll get onConnected.
mPlusClient.connect();
} else if (requestCode == OUR_REQUEST_CODE && responseCode != RESULT_OK) {
// If we've got an error we can't resolve, we're no
// longer in the midst of signing in, so we can stop
// the progress spinner.
mConnectionProgressDialog.dismiss();
}
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.sign_in_button:
Log.v(TAG, "Tapped sign in");
if (!mPlusClient.isConnected()) {
// Show the dialog as we are now signing in.
mConnectionProgressDialog.show();
// Make sure that we will start the resolution (e.g. fire the
// intent and pop up a dialog for the user) for any errors
// that come in.
mResolveOnFail = true;
// We should always have a connection result ready to resolve,
// so we can start that process.
if (mConnectionResult != null) {
startResolution();
} else {
// If we don't have one though, we can start connect in
// order to retrieve one.
mPlusClient.connect();
}
}
break;
case R.id.sign_out_button:
Log.v(TAG, "Tapped sign out");
// We only want to sign out if we're connected.
if (mPlusClient.isConnected()) {
// Clear the default account in order to allow the user
// to potentially choose a different account from the
// account chooser.
mPlusClient.clearDefaultAccount();
// Disconnect from Google Play Services, then reconnect in
// order to restart the process from scratch.
mPlusClient.disconnect();
mPlusClient.connect();
// Hide the sign out buttons, show the sign in button.
findViewById(R.id.sign_in_button).setVisibility(View.VISIBLE);
findViewById(R.id.sign_out_button).setVisibility(View.GONE);
}
break;
// THIS SHOULD NOT BE NEEDED, MUST SWITCH ACTIVITIES UPON AUTHORIZATION
case R.id.authButton:
Log.v(TAG, "Switch Activities");
if (mPlusClient.isConnected()) {
Intent intent = new Intent(view.getContext(),
NaviActivity.class);
view.getContext().startActivity(intent);
}
break;
default:
// Unknown id.
}
}
@Override
public void onAccessRevoked(ConnectionResult status) {
// mPlusClient is now disconnected and access has been revoked.
// We should now delete any data we need to comply with the
// developer properties. To reset ourselves to the original state,
// we should now connect again. We don't have to disconnect as that
// happens as part of the call.
mPlusClient.connect();
// Hide the sign out buttons, show the sign in button.
findViewById(R.id.sign_in_button).setVisibility(View.VISIBLE);
findViewById(R.id.sign_out_button).setVisibility(View.GONE);
}
/**
* A helper method to flip the mResolveOnFail flag and start the resolution
* of the ConnenctionResult from the failed connect() call.
*/
private void startResolution() {
try {
// Don't start another resolution now until we have a
// result from the activity we're about to start.
mResolveOnFail = false;
// If we can resolve the error, then call start resolution
// and pass it an integer tag we can use to track. This means
// that when we get the onActivityResult callback we'll know
// its from being started here.
mConnectionResult.startResolutionForResult(this, OUR_REQUEST_CODE);
} catch (SendIntentException e) {
// Any problems, just try to connect() again so we get a new
// ConnectionResult.
mPlusClient.connect();
}
}
}