Android中登录Facebook的API代码很简单，方法onActivityResult是

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        callbackManager.onActivityResult(requestCode, resultCode, data);
}

Google 的文档说相同方法的代码必须是

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    Log.d(TAG, "onActivityResult:" + requestCode + ":" + resultCode + ":" + data);

    if (requestCode == RC_SIGN_IN) {
        // If the error resolution was not successful we should not resolve further.
        if (resultCode != RESULT_OK) {
            mShouldResolve = false;
        }

        mIsResolving = false;
        mGoogleApiClient.connect();
    }
}

假设所有变量都已声明和初始化。 onActivityResult 的代码必须是什么才能同时处理 Facebook 和 G+ 登录。

我的登录( Activity )代码是

package cc.campusconnect.devapp;

import android.content.Intent;
import android.content.IntentSender;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;

import com.facebook.AccessToken;
import com.facebook.CallbackManager;
import com.facebook.FacebookCallback;
import com.facebook.FacebookException;
import com.facebook.FacebookSdk;
import com.facebook.GraphRequest;
import com.facebook.GraphResponse;
import com.facebook.login.LoginResult;
import com.facebook.login.widget.LoginButton;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.Scopes;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.Scope;
import com.google.android.gms.plus.Plus;


import org.json.JSONException;
import org.json.JSONObject;


public class Login extends AppCompatActivity implements
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener,
        View.OnClickListener{

    private static final String TAG = "Login";
    LoginButton btnFBLogin;
    CallbackManager callbackManager;
    private static final int RC_SIGN_IN = 0;
    private GoogleApiClient mGoogleApiClient;
    /* Is there a ConnectionResult resolution in progress? */
    private boolean mIsResolving = false;

    /* Should we automatically resolve ConnectionResults when possible? */
    private boolean mShouldResolve = false;

    /* Request code used to invoke sign in user interactions. */

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        FacebookSdk.sdkInitialize(getApplicationContext());
        setContentView(R.layout.login);
        callbackManager = CallbackManager.Factory.create();
        btnFBLogin = (LoginButton) findViewById(R.id.fblogin);
        btnFBLogin.setReadPermissions("public_profile email");
        btnFBLogin.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {

            @Override
            public void onSuccess(LoginResult loginResult) {
                // App code
                if (AccessToken.getCurrentAccessToken() != null) {
                    GraphRequest request = GraphRequest.newMeRequest(AccessToken.getCurrentAccessToken(), new GraphRequest.GraphJSONObjectCallback() {
                        @Override
                        public void onCompleted(JSONObject object, GraphResponse response) {

                            JSONObject json = response.getJSONObject();
                            try {
                                if (json != null) {
                                    String text = "<b>Name :</b> " + json.getString("name") + "<br><br><b>Email :</b> " + json.getString("email") + "<br><br><b>Profile link :</b> " + json.getString("link");
                                }

                            } catch (JSONException e) {
                                e.printStackTrace();
                            }
                        }
                    });
                }
            }

            @Override
            public void onCancel() {
                // App code
            }

            @Override
            public void onError(FacebookException exception) {
                // App code
            }
        });

        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(Plus.API)
                .addScope(new Scope(Scopes.PROFILE))
                .build();
        findViewById(R.id.sign_in_button).setOnClickListener(this);

    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        callbackManager.onActivityResult(requestCode, resultCode, data);
    }


    @Override
    public void onConnected(Bundle bundle) {

    }

    @Override
    public void onConnectionSuspended(int i) {

    }

    @Override
    public void onClick(View v) {
        if (v.getId() == R.id.sign_in_button) {
            onSignInClicked();
        }

    }
    private void onSignInClicked() {
        // User clicked the sign-in button, so begin the sign-in process and automatically
        // attempt to resolve any errors that occur.
        mShouldResolve = true;
        mGoogleApiClient.connect();

        // Show a message to the user that we are signing in.
        System.out.println("Signing in...");
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        // Could not connect to Google Play Services.  The user needs to select an account,
        // grant permissions or resolve an error in order to sign in. Refer to the javadoc for
        // ConnectionResult to see possible error codes.
        Log.d(TAG, "onConnectionFailed:" + connectionResult);

        if (!mIsResolving && mShouldResolve) {
            if (connectionResult.hasResolution()) {
                try {
                    connectionResult.startResolutionForResult(this, RC_SIGN_IN);
                    mIsResolving = true;
                } catch (IntentSender.SendIntentException e) {
                    Log.e(TAG, "Could not resolve ConnectionResult.", e);
                    mIsResolving = false;
                    mGoogleApiClient.connect();
                }
            } else {
                // Could not resolve the connection result, show the user an
                // error dialog.
                //showErrorDialog(connectionResult);
                System.out.println("Couldn't connect");
            }
        } else {
            // Show the signed-out UI
            //showSignedOutUI();
            System.out.println("Signed out");
        }
    }

    @Override
    protected void onStart() {
        super.onStart();
        mGoogleApiClient.connect();
    }

    @Override
    protected void onStop() {
        super.onStop();
        mGoogleApiClient.disconnect();
    }
}

最佳答案

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
     Log.d(TAG, "onActivityResult:" + requestCode + ":" + resultCode + ":" + data);

if (requestCode == RC_SIGN_IN) {
    // If the error resolution was not successful we should not resolve further.
    if (resultCode != RESULT_OK) {
        mShouldResolve = false;
    }

    mIsResolving = false;
    mGoogleApiClient.connect();
}else{
  //If not request code is RC_SIGN_IN it must be facebook
  callbackManager.onActivityResult(requestCode, resultCode, data);
 }
}

关于android - Android 中 Facebook 和 Google+ 登录的 onActivityResult 代码，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32778341/