我是 facebook sdk 的新手，所以我不太确定为什么会收到此错误。我已将其缩小到本节：
List<String> permissions = session.getPermissions();
if (!isSubsetOf(PERMISSIONS, permissions)) {
pendingPublishReauthorization = true;
Session.NewPermissionsRequest newPermissionsRequest = new Session
.NewPermissionsRequest(this, PERMISSIONS);
Here>> session.requestNewPublishPermissions(newPermissionsRequest); <<Here
return;
} //this code is located below in the publishStory() method
我完全按照原样遵循了Authenticate教程和Publish Feed教程，并进行了一些重新排序以满足我的需要。我不确定我可能错过了什么。我将发布SelectionFragment课程，我将发布状态内容放入其中，因为它是用户登录的地方。为了确保这一点很清楚，登录工作完美。但是，当我尝试单击发布状态时，它什么也不做。我第二次点击它，它崩溃了。任何解释将不胜感激。
public class SelectionFragment extends Fragment{
private static final int REAUTH_ACTIVITY_CODE = 100;
private ProfilePictureView profilePictureView;
private TextView userNameView;
private UiLifecycleHelper uiHelper;
private Button shareButton;
private static final List<String> PERMISSIONS = Arrays.asList("publish_actions");
private static final String PENDING_PUBLISH_KEY = "pendingPublishReauthorization";
protected static final String TAG = "SelectionFragment.java";
private boolean pendingPublishReauthorization = false;
private Session.StatusCallback callback = new Session.StatusCallback() {
@Override
public void call(final Session session, final SessionState state, final Exception exception) {
onSessionStateChange(session, state, exception);
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
uiHelper = new UiLifecycleHelper(getActivity(), callback);
uiHelper.onCreate(savedInstanceState);
}//end of onCreate()
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View view = inflater.inflate(R.layout.selection, container, false);
// Find the user's profile picture custom view
profilePictureView = (ProfilePictureView) view.findViewById(R.id.selection_profile_pic);
profilePictureView.setCropped(true);
// Find the user's name view
userNameView = (TextView) view.findViewById(R.id.selection_user_name);
//find the share button
shareButton = (Button) view.findViewById(R.id.shareButton);
shareButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
publishStory();
}
});
// Check for an open session
Session session = Session.getActiveSession();
if (session != null && session.isOpened()) {
// Get the user's data
makeMeRequest(session);
}
if (savedInstanceState != null) {
pendingPublishReauthorization =
savedInstanceState.getBoolean(PENDING_PUBLISH_KEY, false);
}
return view;
}//end of onCreateView
/*
* Private method that requests users data
* */
private void makeMeRequest(final Session session) {
// Make an API call to get user data and define a
// new callback to handle the response.
Request request = Request.newMeRequest(session,
new Request.GraphUserCallback() {
@Override
public void onCompleted(GraphUser user, Response response) {
// If the response is successful
if (session == Session.getActiveSession()) {
if (user != null) {
// Set the id for the ProfilePictureView
// view that in turn displays the profile picture.
profilePictureView.setProfileId(user.getId());
// Set the Textview's text to the user's name.
userNameView.setText(user.getName());
}
}
if (response.getError() != null) {
// Handle errors, will do so later.
}
}
});
request.executeAsync();
}
/*
* private method that will respond to session changes and call
* the makeMeRequest() method if the session's open
* */
private void onSessionStateChange(final Session session, SessionState state, Exception exception) {
if (session != null && session.isOpened()) {
// Get the user's data.
makeMeRequest(session);
}
/*The following checks if user is logged in and hides or shows the share button*/
if (state.isOpened()) {
shareButton.setVisibility(View.VISIBLE);
if (pendingPublishReauthorization &&
state.equals(SessionState.OPENED_TOKEN_UPDATED)) {
pendingPublishReauthorization = false;
publishStory();
}
} else if (state.isClosed()) {
shareButton.setVisibility(View.INVISIBLE);
}
}//end of onSessionStateChanged
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REAUTH_ACTIVITY_CODE) {
uiHelper.onActivityResult(requestCode, resultCode, data);
}
}
@Override
public void onResume() {
super.onResume();
uiHelper.onResume();
}
@Override
public void onSaveInstanceState(Bundle bundle) {
super.onSaveInstanceState(bundle);
bundle.putBoolean(PENDING_PUBLISH_KEY, pendingPublishReauthorization);
uiHelper.onSaveInstanceState(bundle);
}
@Override
public void onPause() {
super.onPause();
uiHelper.onPause();
}
@Override
public void onDestroy() {
super.onDestroy();
uiHelper.onDestroy();
}
/*
* What actually publishes the status update
* */
private void publishStory() {
Session session = Session.getActiveSession();
if (session != null){
// Check for publish permissions
List<String> permissions = session.getPermissions();
if (!isSubsetOf(PERMISSIONS, permissions)) {
pendingPublishReauthorization = true;
Session.NewPermissionsRequest newPermissionsRequest = new Session
.NewPermissionsRequest(this, PERMISSIONS);
session.requestNewPublishPermissions(newPermissionsRequest);
return;
}
Bundle postParams = new Bundle();
postParams.putString("name", "Facebook SDK for Android");
postParams.putString("caption", "Build great social apps and get more installs.");
postParams.putString("description", "The Facebook SDK for Android makes it easier and faster to develop Facebook integrated Android apps.");
postParams.putString("link", "https://developers.facebook.com/android");
postParams.putString("picture", "https://raw.github.com/fbsamples/ios-3.x-howtos/master/Images/iossdk_logo.png");
Request.Callback callback= new Request.Callback() {
public void onCompleted(Response response) {
JSONObject graphResponse = response
.getGraphObject()
.getInnerJSONObject();
String postId = null;
try {
postId = graphResponse.getString("id");
} catch (JSONException e) {
Log.i(TAG,
"JSON error "+ e.getMessage());
}
FacebookRequestError error = response.getError();
if (error != null) {
Toast.makeText(getActivity()
.getApplicationContext(),
error.getErrorMessage(),
Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getActivity()
.getApplicationContext(),
postId,
Toast.LENGTH_LONG).show();
}
}
};
Request request = new Request(session, "me/feed", postParams,
HttpMethod.POST, callback);
RequestAsyncTask task = new RequestAsyncTask(request);
task.execute();
}
}//end of publishStory
private boolean isSubsetOf(Collection<String> subset, Collection<String> superset) {
for (String string : subset) {
if (!superset.contains(string)) {
return false;
}
}
return true;
}
}//end of class
编辑
好的，所以我终于可以发帖了，但是现在我已经弄清楚为什么它仍然崩溃了。上述类中的最后一个方法isSubset似乎总是返回 false，这意味着它会一直运行，即使已经创建了发布权限。
编辑 2
public class FacebookFrag extends FragmentActivity {
private static final int SPLASH = 0;
private static final int SELECTION = 1;
private static final int SETTINGS = 2;
private static final int FRAGMENT_COUNT = SETTINGS +1;
private Fragment[] fragments = new Fragment[FRAGMENT_COUNT];
private MenuItem settings;
//flag that indicates a visible activity
private boolean isResumed = false;
private UiLifecycleHelper uiHelper;
private Session.StatusCallback callback =
new Session.StatusCallback() {
@Override
public void call(Session session,
SessionState state, Exception exception) {
onSessionStateChange(session, state, exception);
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.facebook_layout);
FragmentManager fm = getSupportFragmentManager();
fragments[SPLASH] = fm.findFragmentById(R.id.splashFragment);
fragments[SELECTION] = fm.findFragmentById(R.id.selectionFragment);
fragments[SETTINGS] = fm.findFragmentById(R.id.userSettingsFragment);
FragmentTransaction transaction = fm.beginTransaction();
for(int i = 0; i < fragments.length; i++) {
transaction.hide(fragments[i]);
}
transaction.commit();
uiHelper = new UiLifecycleHelper(this, callback);
uiHelper.onCreate(savedInstanceState);
}
private void showFragment(int fragmentIndex, boolean addToBackStack) {
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction transaction = fm.beginTransaction();
for (int i = 0; i < fragments.length; i++) {
if (i == fragmentIndex) {
transaction.show(fragments[i]);
} else {
transaction.hide(fragments[i]);
}
}
if (addToBackStack) {
transaction.addToBackStack(null);
}
transaction.commit();
}
private void onSessionStateChange(Session session, SessionState state, Exception exception) {
// Only make changes if the activity is visible
if (isResumed) {
FragmentManager manager = getSupportFragmentManager();
// Get the number of entries in the back stack
int backStackSize = manager.getBackStackEntryCount();
// Clear the back stack
for (int i = 0; i < backStackSize; i++) {
manager.popBackStack();
}
if (state.isOpened()) {
// If the session state is open:
// Show the authenticated fragment
showFragment(SELECTION, false);
} else if (state.isClosed()) {
// If the session state is closed:
// Show the login fragment
showFragment(SPLASH, false);
}
}
}
@Override
protected void onResumeFragments() {
super.onResumeFragments();
Session session = Session.getActiveSession();
if (session != null && session.isOpened()) {
// if the session is already open,
// try to show the selection fragment
showFragment(SELECTION, false);
} else {
// otherwise present the splash screen
// and ask the person to login.
showFragment(SPLASH, false);
}
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// only add the menu when the selection fragment is showing
if (fragments[SELECTION].isVisible()) {
if (menu.size() == 0) {
settings = menu.add(R.string.settings);
}
return true;
} else {
menu.clear();
settings = null;
}
return false;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.equals(settings)) {
showFragment(SETTINGS, true);
return true;
}
return false;
}
@Override
public void onResume() {
super.onResume();
uiHelper.onResume();
isResumed = true;
}
@Override
public void onPause() {
super.onPause();
uiHelper.onPause();
isResumed = false;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
uiHelper.onActivityResult(requestCode, resultCode, data);
}
@Override
public void onDestroy() {
super.onDestroy();
uiHelper.onDestroy();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
uiHelper.onSaveInstanceState(outState);
}
}//end of class