在我的应用程序的起始页面上，我要求用户通过Facebook进行身份验证，然后我请求一些权限并获取一些信息：
LoginButton authButton = (LoginButton) view.findViewById(R.id.authButton);
authButton.setFragment(this);
authButton.setReadPermissions(Arrays.asList("user_likes", "user_status"));
fb = new FacebookMain();
我能够获得所有这些信息，但是转到我的下一页我想在列表视图上给出一个按钮，用户可以在那里发布朋友墙。我跟着HelloFacebook示例，它就像一个魅力，但在我的情况下，当我尝试在一个片段中实现它不能按预期工作，我不希望用户每次他想要发布时登录（我使用的是这里的额外许可 - 发布）我必须在这个片段中实现所有生命周期事件吗？有没有其他或推荐的方法？
目前我正在做的是：
我的班级声明：
public class FragmentTab1 extends Fragment {
班级变量：
String FACEBOOK_ID;
String IMAGE_CONTENT;
EditText SEARCH;
private static final String PERMISSION = "publish_actions";
Session session;
private final String PENDING_ACTION_BUNDLE_KEY = "com.exa.digitalrem:PendingAction";
private PendingAction pendingAction = PendingAction.NONE;
private GraphUser user1;
private UiLifecycleHelper uiHelper;
与facebook相关的功能：
private PendingAction pendingAction = PendingAction.NONE;
private GraphUser user1;
private enum PendingAction {
NONE, POST_PHOTO, POST_STATUS_UPDATE
}
private Session.StatusCallback callback = new Session.StatusCallback() {
@Override
public void call(Session session, SessionState state,
Exception exception) {
onSessionStateChange(session, state, exception);
}
};
public static boolean isActive() {
Session session = Session.getActiveSession();
if (session == null) {
return false;
}
return session.isOpened();
}
private void onSessionStateChange(Session session, SessionState state,
Exception exception) {
if (pendingAction != PendingAction.NONE && (exception instanceof FacebookOperationCanceledException || exception instanceof FacebookAuthorizationException)) {
new AlertDialog.Builder(getActivity()) .setTitle("cancelled").setMessage("NotGranted").setPositiveButton("Ok", null).show();
pendingAction = PendingAction.NONE;
} else if (state == SessionState.OPENED_TOKEN_UPDATED) {
handlePendingAction();
}
updateUI();
}
private void updateUI() {
Session session = Session.getActiveSession();
boolean enableButtons = (session != null && session.isOpened());
if (enableButtons && user1 != null) {
// profilePictureView.setProfileId(user.getId());
// greeting.setText(getString(R.string.app_name, user.getFirstName()));
} else {
// profilePictureView.setProfileId(null);
// greeting.setText(null);
}
}
@SuppressWarnings("incomplete-switch")
private void handlePendingAction() {
PendingAction previouslyPendingAction = pendingAction;
// These actions may re-set pendingAction if they are still pending, but
// we assume they
// will succeed.
pendingAction = PendingAction.NONE;
}
在onCreate中：
uiHelper = new UiLifecycleHelper(getActivity(), callback);
uiHelper.onCreate(savedInstanceState);
if (savedInstanceState != null) {
name = savedInstanceState.getString(PENDING_ACTION_BUNDLE_KEY);
pendingAction = PendingAction.valueOf(name);
}
//===============================================
Session.openActiveSessionFromCache(getActivity());
//================================================
这是我的facebook post方法，我在点击按钮上调用它，这是在列表视图中：
public void postFB(String id) {
System.out.println("in fb");
if (isNetworkConnected()) {
Session session = Session.getActiveSession();
if (session != null) {
System.out.println("session not null");
if (hasPublishPermission()) {
//do something
WebDialog feedDialog = (new WebDialog.FeedDialogBuilder(
getActivity(), Session.openActiveSessionFromCache(getActivity()),
params)).setOnCompleteListener(
new OnCompleteListener() {
@Override
public void onComplete(Bundle values,
FacebookException error) {
// frag3.setFbId(null);
// ---------------------------- got to put
// check here
// onBackPressed();
}
}).build();
feedDialog.show();
} else if (session.isOpened()) {
// We need to get new permissions, then complete the action
// when we get called back.
session.requestNewPublishPermissions(new Session.NewPermissionsRequest(
getActivity(), PERMISSION));
// do something
WebDialog feedDialog = (new WebDialog.FeedDialogBuilder(
getActivity(), Session.getActiveSession(),
params)).setOnCompleteListener(
new OnCompleteListener() {
@Override
public void onComplete(Bundle values,
FacebookException error) {
// frag3.setFbId(null);
// ---------------------------- got to put
// check here
//onBackPressed();
}
}).build();
feedDialog.show();
}
}else if(session == null){
System.out.println("login");
}
} else {
Toast.makeText(getActivity(),
"Please check your internet connection", Toast.LENGTH_LONG)
.show();
}
}
然而，这似乎不是一个正确的方法，有没有更好的方法？另外，如何检测用户会话是否已过期并提示用户再次登录？ Docs似乎没有透露Login按钮的内部功能？
答案 0 :(得分：0)
不要开始新的会话....在源代码中更改它
private Session.StatusCallback callback = new Session.StatusCallback() {
@Override
public void call(Session session, SessionState state,
Exception exception) {
onSessionStateChange(session, state, exception);
}
};
答案 1 :(得分：0)
在标记下的AndroidManifest.xml中添加以下行
<activity android:name="com.facebook.LoginActivity" />
还在string.xml中添加facebook app id
声明私人成员
private boolean isOnCreate;
private List<String> permissions = new ArrayList<String>();
private JSONObject facebookObject;
private ProgressDialog progressDialog;
/** The callback. */
private final com.facebook.Session.StatusCallback callback = new
com.facebook.Session.StatusCallback() {
@Override
public void call(Session session, SessionState state, Exception exception) {
SignInActivity.this.onSessionStateChange(session, state, exception);
}
};
private void onSessionStateChange(Session session, SessionState state, Exception exception) {
if (state == SessionState.OPENED) {
if (this.isOnCreate) {
this.isOnCreate = false;
return;
}
onFacebookLoginDone();
} else if (state == SessionState.CLOSED_LOGIN_FAILED) {
showErrorMessage();
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Session session = Session.getActiveSession();
if (session == null) {
session = new Session(this);
session.closeAndClearTokenInformation();
}
Session.setActiveSession(session);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_fb_login:
this.loginUsingFacebook();
break;
default:
break;
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
Session.getActiveSession().onActivityResult(this, requestCode, resultCode, data);
}
/**
* Login using facebook.
*/
private void loginUsingFacebook() {
isOnCreate = false;
final Session session = Session.getActiveSession();
if (session != null && session.getState().equals(SessionState.OPENED)) {
Session.openActiveSession(this, true, this.callback);
onFacebookLoginDone();
} else {
final Session.OpenRequest temp = new Session.OpenRequest(this);
this.permissions.clear();
this.permissions.add(UserClass.EMAIL);
this.permissions.add("user_location");
temp.setPermissions(this.permissions);
temp.setCallback(this.callback);
session.openForRead(temp);
}
}
/**
* On facebook login done.
*/
private void onFacebookLoginDone() {
final Bundle bundle = new Bundle();
bundle.putString("fields", "first_name,last_name,id,location,locale,username,email,verified");
new PerformSignUpOnServer("/me", bundle).execute();
}
/**
* The Class PerformSignUpOnServer.
*/
private class PerformSignUpOnServer extends AsyncTask<Void, Void, Void> {
/** The server url. */
private String serverURL;
/** The server bundle. */
private Bundle serverBundle;
/**
* Instantiates a new perform sign up on server.
*
* @param url
* the url
* @param bundle
* the bundle
*/
public PerformSignUpOnServer(String url, Bundle bundle) {
this.serverBundle = bundle;
this.serverURL = url;
}
/*
* (non-Javadoc)
*
* @see android.os.AsyncTask#onPreExecute()
*/
@Override
protected void onPreExecute() {
progressDialog = ProgressDialog.show(SignInActivity.this, "", "Loading...");
super.onPreExecute();
}
/*
* (non-Javadoc)
*
* @see android.os.AsyncTask#doInBackground(Params[])
*/
@Override
protected Void doInBackground(Void... params) {
signUpUserOnServer(this.serverURL, this.serverBundle);
return null;
}
/*
* (non-Javadoc)
*
* @see android.os.AsyncTask#onPostExecute(java.lang.Object)
*/
@Override
protected void onPostExecute(Void result) {
}
}
/**
* Sign up user on server.
*
* @param url
* the url
* @param bundle
* the bundle
*/
private void signUpUserOnServer(String url, Bundle bundle) {
final Session session = Session.getActiveSession();
if (session != null && session.isClosed() == false) {
final Request userInformation = new Request(session, url, bundle, HttpMethod.GET);
final Response response = userInformation.executeAndWait();
facebookObject = response.getGraphObject().getInnerJSONObject();
Log.d("json", facebookObject.toString());
}
}
/**
* On session state change.
*
* @param state
* the state
*/
private void onSessionStateChange(SessionState state) {
if (state == SessionState.OPENED) {
if (isOnCreate) {
isOnCreate = false;
return;
}
onFacebookLoginDone();
}
}
查看标有“json”的日志猫，你将拥有一个facebook对象