El fragmento de inicio de sesión de Facebook cierra la aplicación, utilizando Facebook SDK 3.0.1

Estoy desarrollando una aplicación para Android que debería integrarse con Facebook. He ido a través de guía oficial y varias otras guías y creo que he implementado todo correctamente con el Facebook login framgent.

Sin embargo, el SDK realiza un inicio de sesión satisfactorio sólo la primera vez. Si cierro la sesión y vuelvo a intentarlo, la aplicación se cierra sin ninguna excepción. Lo mismo sucede si mato mi aplicación y la comienzo de la lista de aplicaciones.

Puedo reproducirlo tanto en el emulador como en el dispositivo real (Nexus 7).

LoginActivity.java:

package com.everporter.everporter; import java.io.BufferedOutputStream; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import org.json.JSONException; import org.json.JSONObject; import com.everporter.everporter.FBLoginFragment.OnFBAccessTokenPass; import android.animation.Animator; import android.animation.AnimatorListenerAdapter; import android.annotation.TargetApi; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.SharedPreferences; import android.os.AsyncTask; import android.os.Build; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.telephony.PhoneNumberUtils; import android.text.TextUtils; import android.util.Log; import android.view.KeyEvent; import android.view.Menu; import android.view.View; import android.view.inputmethod.EditorInfo; import android.widget.EditText; import android.widget.TextView; /** * Activity which displays a login screen to the user, offering registration as * well. */ public class LoginActivity extends FragmentActivity implements OnFBAccessTokenPass { /** * The default email to populate the email field with. */ public static final String EXTRA_EMAIL = "com.example.android.authenticatordemo.extra.EMAIL"; private static final String REST_METHOD_NAME = "/login/"; private static final String SOCIAL_REST_METHOD_NAME = "/validation/"; private static final String TAG = "UserLoginTask"; private static final String FB_TAG = "UserFacebookLoginTask"; /** * Keep track of the login task to ensure we can cancel it if requested. */ private UserLoginTask mAuthTask = null; private UserFacebookLoginTask mFacebookAuthTask = null; private String mFacebookAccessToken; private String mFacebookUserId; // API URL read from the settings (set in main activity) private String mRestApiUrl; private int mConnectionTimeout; private int mReadTimeout; private SharedPreferences mPrefs; // Error message set by the async task, if the error does happen indeed private String mAsyncTaskErrorMsg; // Values for email and password at the time of the login attempt. private String mEmail; private String mPassword; private String mSessionCookie; // our session // UI references. private EditText mEmailView; private EditText mPasswordView; private View mLoginFormView; private View mLoginStatusView; private TextView mLoginStatusMessageView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_login); mPrefs = getSharedPreferences("settings", MODE_PRIVATE); mRestApiUrl = mPrefs.getString("api_url", ""); mConnectionTimeout = mPrefs.getInt("connection_timeout", 3000); mReadTimeout = mPrefs.getInt("read_timeout", 3000); // Set up the login form. mEmail = getIntent().getStringExtra(EXTRA_EMAIL); mEmailView = (EditText) findViewById(R.id.email); mEmailView.setText(mEmail); mPasswordView = (EditText) findViewById(R.id.password); mPasswordView .setOnEditorActionListener(new TextView.OnEditorActionListener() { @Override public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) { if (id == R.id.login || id == EditorInfo.IME_NULL) { attemptLogin(); return true; } return false; } }); mLoginFormView = findViewById(R.id.login_form); mLoginStatusView = findViewById(R.id.login_status); mLoginStatusMessageView = (TextView) findViewById(R.id.login_status_message); findViewById(R.id.sign_in_button).setOnClickListener( new View.OnClickListener() { @Override public void onClick(View view) { attemptLogin(); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { super.onCreateOptionsMenu(menu); getMenuInflater().inflate(R.menu.login, menu); return true; } /** * Handle Facebook login */ @Override public void onFBAccessTokenPass(String accessToken, String uid) { // we are passed Facebook access token, successful login Log.i(TAG, "Facebook access token: " + accessToken); mFacebookAccessToken = accessToken; mFacebookUserId = uid; // Show a progress spinner, and kick off a background task to // sent the FB token to the server. mLoginStatusMessageView.setText(R.string.login_progress_signing_in); showProgress(true); mFacebookAuthTask = new UserFacebookLoginTask(this); mFacebookAuthTask.execute((Void) null); } /** * Attempts to sign in or register the account specified by the login form. * If there are form errors (invalid email, missing fields, etc.), the * errors are presented and no actual login attempt is made. */ public void attemptLogin() { if (mAuthTask != null) { return; } // Reset errors. mEmailView.setError(null); mPasswordView.setError(null); mAsyncTaskErrorMsg = ""; // Store values at the time of the login attempt. mEmail = mEmailView.getText().toString(); mPassword = mPasswordView.getText().toString(); boolean cancel = false; View focusView = null; // Check for a valid password. if (TextUtils.isEmpty(mPassword)) { mPasswordView.setError(getString(R.string.error_field_required)); focusView = mPasswordView; cancel = true; } else if (mPassword.length() < 4) { mPasswordView.setError(getString(R.string.error_invalid_password)); focusView = mPasswordView; cancel = true; } // Check for a valid email address or phone number. if (TextUtils.isEmpty(mEmail)) { mEmailView.setError(getString(R.string.error_field_required)); focusView = mEmailView; cancel = true; } else if (!android.util.Patterns.EMAIL_ADDRESS.matcher(mEmail).matches() && !PhoneNumberUtils.isGlobalPhoneNumber(mEmail)) { mEmailView.setError(getString(R.string.error_invalid_email)); focusView = mEmailView; cancel = true; } if (cancel) { // There was an error; don't attempt login and focus the first // form field with an error. focusView.requestFocus(); } else { // Show a progress spinner, and kick off a background task to // perform the user login attempt. mLoginStatusMessageView.setText(R.string.login_progress_signing_in); showProgress(true); mAuthTask = new UserLoginTask(this); mAuthTask.execute((Void) null); } } /** * Shows the progress UI and hides the login form. */ @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2) private void showProgress(final boolean show) { // On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow // for very easy animations. If available, use these APIs to fade-in // the progress spinner. if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) { int shortAnimTime = getResources().getInteger( android.R.integer.config_shortAnimTime); mLoginStatusView.setVisibility(View.VISIBLE); mLoginStatusView.animate().setDuration(shortAnimTime) .alpha(show ? 1 : 0) .setListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { mLoginStatusView.setVisibility(show ? View.VISIBLE : View.GONE); } }); mLoginFormView.setVisibility(View.VISIBLE); mLoginFormView.animate().setDuration(shortAnimTime) .alpha(show ? 0 : 1) .setListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE); } }); } else { // The ViewPropertyAnimator APIs are not available, so simply show // and hide the relevant UI components. mLoginStatusView.setVisibility(show ? View.VISIBLE : View.GONE); mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE); } } /** * Represents an asynchronous login/registration task used to authenticate * the user. */ public class UserLoginTask extends AsyncTask<Void, Void, Boolean> { private Context mContext; public UserLoginTask(Context context) { this.mContext = context; } @Override protected Boolean doInBackground(Void... params) { Log.i(TAG, "Begin auth..."); HttpURLConnection conn = null; StringBuilder sb = new StringBuilder(); BufferedOutputStream printout; boolean signedInOk = false; try { URL url = new URL(mRestApiUrl + REST_METHOD_NAME); conn = (HttpURLConnection) url.openConnection(); conn.setDoInput(true); conn.setDoOutput(true); conn.setUseCaches(false); conn.setConnectTimeout(mConnectionTimeout); conn.setReadTimeout(mReadTimeout); conn.setRequestMethod("POST"); conn.setRequestProperty("Content-Type","application/json; charset=utf-8"); conn.connect(); //Create JSONObject here JSONObject jsonParam = new JSONObject(); jsonParam.put("password", mPassword); jsonParam.put("username", mEmail); // Send POST output. printout = new BufferedOutputStream(conn.getOutputStream()); printout.write(jsonParam.toString().getBytes("UTF-8")); printout.flush(); printout.close(); int httpCode = conn.getResponseCode(); if (httpCode == HttpURLConnection.HTTP_OK) { BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8")); String line = null; while ((line = br.readLine()) != null) { sb.append(line + "\n"); } br.close(); Log.i(TAG, sb.toString()); JSONObject jsonResponse = new JSONObject(sb.toString()); int resultCode = jsonResponse.getInt("code"); if (resultCode == 0) { // get the session id String cookie = conn.getHeaderField("Set-Cookie"); if (cookie != null) { Log.i(TAG, cookie); signedInOk = true; mSessionCookie = cookie; Log.i(TAG, "Authenticated"); } } else if (resultCode == 2 || resultCode == 3) { signedInOk = false; // wrong login and password } else { // get the error message if (!jsonResponse.isNull("message")) { mAsyncTaskErrorMsg = jsonResponse.getString("message"); } else { mAsyncTaskErrorMsg = getString(R.string.internal_error); } } } else{ Log.e(TAG, conn.getResponseMessage()); } } catch (JSONException e) { Log.e(TAG, e.getMessage()); mAsyncTaskErrorMsg = e.getMessage(); } catch (IOException e) { Log.e(TAG, e.getMessage()); mAsyncTaskErrorMsg = e.getMessage(); } finally { if (conn != null) conn.disconnect(); } Log.i(TAG, "End auth..."); return signedInOk; } @Override protected void onPostExecute(final Boolean success) { mAuthTask = null; showProgress(false); if (success) { // store the userId SharedPreferences.Editor ed = mPrefs.edit(); ed.putString("session_cookie", mSessionCookie); ed.putLong("session_cookie_time", System.currentTimeMillis()); ed.apply(); // start main Intent intent = new Intent(mContext, MainActivity.class); startActivity(intent); finish(); } else { if (!mAsyncTaskErrorMsg.isEmpty()) { // show the error message new AlertDialog.Builder(mContext) .setTitle("Error occured") .setMessage(mAsyncTaskErrorMsg) .setNeutralButton(android.R.string.ok, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { dialog.cancel(); } }).show(); } else { mPasswordView .setError(getString(R.string.error_incorrect_password)); mPasswordView.requestFocus(); } } } @Override protected void onCancelled() { mAuthTask = null; showProgress(false); } } /** * Represents an asynchronous login task used to authenticate * the user via Facebook. */ public class UserFacebookLoginTask extends AsyncTask<Void, Void, Boolean> { private Context mContext; public UserFacebookLoginTask(Context context) { this.mContext = context; } @Override protected Boolean doInBackground(Void... params) { Log.i(FB_TAG, "Begin Facebook validation..."); HttpURLConnection conn = null; StringBuilder sb = new StringBuilder(); BufferedOutputStream printout; boolean signedInOk = false; try { URL url = new URL(mRestApiUrl + SOCIAL_REST_METHOD_NAME); conn = (HttpURLConnection) url.openConnection(); conn.setDoInput(true); conn.setDoOutput(true); conn.setUseCaches(false); conn.setConnectTimeout(mConnectionTimeout); conn.setReadTimeout(mReadTimeout); conn.setRequestMethod("POST"); conn.setRequestProperty("Content-Type","application/json; charset=utf-8"); conn.connect(); //Create JSONObject here JSONObject jsonParam = new JSONObject(); jsonParam.put("provider", "facebook"); jsonParam.put("token", mFacebookAccessToken); jsonParam.put("uid", mFacebookUserId); // Send POST output. printout = new BufferedOutputStream(conn.getOutputStream()); printout.write(jsonParam.toString().getBytes("UTF-8")); printout.flush(); printout.close(); int httpCode = conn.getResponseCode(); if (httpCode == HttpURLConnection.HTTP_OK) { BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8")); String line = null; while ((line = br.readLine()) != null) { sb.append(line + "\n"); } br.close(); Log.i(FB_TAG, sb.toString()); JSONObject jsonResponse = new JSONObject(sb.toString()); int resultCode = jsonResponse.getInt("code"); if (resultCode == 0) { // get the session id String cookie = conn.getHeaderField("Set-Cookie"); if (cookie != null) { Log.i(FB_TAG, cookie); signedInOk = true; mSessionCookie = cookie; Log.i(FB_TAG, "Authenticated"); } } else if (resultCode == 2 || resultCode == 3) { signedInOk = false; // no such user in the database mAsyncTaskErrorMsg = ""; } else { // get the error message if (!jsonResponse.isNull("message")) { mAsyncTaskErrorMsg = jsonResponse.getString("message"); } else { mAsyncTaskErrorMsg = getString(R.string.internal_error); } } } else{ Log.e(FB_TAG, conn.getResponseMessage()); } } catch (JSONException e) { Log.e(FB_TAG, e.getMessage()); mAsyncTaskErrorMsg = e.getMessage(); } catch (IOException e) { Log.e(FB_TAG, e.getMessage()); mAsyncTaskErrorMsg = e.getMessage(); } finally { if (conn != null) conn.disconnect(); } Log.i(FB_TAG, "End auth..."); return signedInOk; } @Override protected void onPostExecute(final Boolean success) { mFacebookAuthTask = null; showProgress(false); if (success) { // store the userId SharedPreferences.Editor ed = mPrefs.edit(); ed.putString("session_cookie", mSessionCookie); ed.putLong("session_cookie_time", System.currentTimeMillis()); ed.apply(); // start main Intent intent = new Intent(mContext, MainActivity.class); startActivity(intent); finish(); } else { if (!mAsyncTaskErrorMsg.isEmpty()) { // show the error message new AlertDialog.Builder(mContext) .setTitle("Error occured") .setMessage(mAsyncTaskErrorMsg) .setNeutralButton(android.R.string.ok, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { dialog.cancel(); } }).show(); } } } @Override protected void onCancelled() { mFacebookAuthTask = null; showProgress(false); } } } 

FBLoginFragment.java:

 package com.everporter.everporter; import java.util.Arrays; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.support.v4.app.Fragment; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import com.facebook.Request; import com.facebook.Response; import com.facebook.Session; import com.facebook.SessionState; import com.facebook.UiLifecycleHelper; import com.facebook.model.GraphUser; import com.facebook.widget.LoginButton; public class FBLoginFragment extends Fragment { private static final String TAG = "FBLoginFragment"; private UiLifecycleHelper mUiHelper; private OnFBAccessTokenPass mTokenPasser; private String mSessionToken; private Session.StatusCallback callback = new Session.StatusCallback() { @Override public void call(Session session, SessionState state, Exception exception) { onSessionStateChange(session, state, exception); } }; private void onSessionStateChange(Session session, SessionState state, Exception exception) { if (state.isOpened()) { Log.i(TAG, "Logged in..."); mSessionToken = session.getAccessToken(); // Request user data and show the results Request.executeMeRequestAsync(session, new Request.GraphUserCallback() { @Override public void onCompleted(GraphUser user, Response response) { if (user != null) { // pass the access token to the activity // with the user id mTokenPasser.onFBAccessTokenPass(mSessionToken, user.getId()); } } }); } else if (state.isClosed()) { Log.i(TAG, "Logged out..."); mSessionToken = ""; } } public interface OnFBAccessTokenPass { public void onFBAccessTokenPass(String accessToken, String uid); } @Override public void onAttach(Activity a) { super.onAttach(a); mTokenPasser = (OnFBAccessTokenPass) a; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mUiHelper = new UiLifecycleHelper(getActivity(), callback); mUiHelper.onCreate(savedInstanceState); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fb_login_fragment, container, false); LoginButton authButton = (LoginButton) view.findViewById(R.id.authButton); authButton.setFragment(this); authButton.setReadPermissions(Arrays.asList("email")); return view; } @Override public void onResume() { super.onResume(); // For scenarios where the main activity is launched and user // session is not null, the session state change notification // may not be triggered. Trigger it if it's open/closed. Session session = Session.getActiveSession(); if (session != null && (session.isOpened() || session.isClosed()) ) { onSessionStateChange(session, session.getState(), null); } mUiHelper.onResume(); } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); mUiHelper.onActivityResult(requestCode, resultCode, data); } @Override public void onPause() { super.onPause(); mUiHelper.onPause(); } @Override public void onDestroy() { super.onDestroy(); mUiHelper.onDestroy(); } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); mUiHelper.onSaveInstanceState(outState); } } 

AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.everporter.everporter" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="10" android:targetSdkVersion="17" /> <uses-permission android:name="android.permission.INTERNET"/> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.everporter.everporter.MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name="com.everporter.everporter.LoginActivity" android:label="@string/title_activity_login" android:noHistory="true" android:excludeFromRecents="true" android:windowSoftInputMode="adjustResize|stateVisible" > </activity> <meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/fb_app_id"/> <activity android:name="com.facebook.LoginActivity" android:label="@string/app_name"></activity> </application> </manifest> 

Después de pasar un día en este tema, he encontrado la razón: mi actividad tenía android: noHistory = "true" en el manifiesto que impidió que Facebook SDK iniciara mi actividad cuando se abriera la sesión. ¡¡Uf!!

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