我的应用程序中有两个活动来处理1）登录2）共享图像（如果没有登录，先登录然后共享）
问题是当我将所有代码包含在一个有效的活动中时。但是当我将登录放在一个片段中，共享图像放在另一个活动中，然后登录就可以了，但是共享图像活动表现不正确（请求我登录即使它已登录，也不会触发共享图像操作）< / p>
登录片段：
public class Home extends Fragment {
public View rootView;
public ImageView HomeBg;
public ImageView buttonLoginLogout;
public TextView chi;
public TextView eng;
public ColorStateList oldColor;
public SharedPreferences prefs;
//Facebook login
private Session.StatusCallback statusCallback = new SessionStatusCallback();
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
getActivity().getActionBar().hide();
rootView = inflater.inflate(R.layout.home, container, false);
buttonLoginLogout = (ImageView) rootView.findViewById(R.id.home_connectFB);
eng = (TextView) rootView.findViewById(R.id.btn_eng);
chi = (TextView) rootView.findViewById(R.id.btn_chi);
if (getActivity().getResources().getConfiguration().locale
.equals(Locale.TRADITIONAL_CHINESE)) {
chi.setTextColor(getActivity().getResources().getColor(
android.R.color.white));
oldColor = eng.getTextColors();
} else {
eng.setTextColor(getActivity().getResources().getColor(
android.R.color.white));
oldColor = chi.getTextColors();
}
eng.setOnClickListener(setChangeLangListener("en"));
chi.setOnClickListener(setChangeLangListener("zh"));
//Facebook login
Settings.addLoggingBehavior(LoggingBehavior.INCLUDE_ACCESS_TOKENS);
Session session = Session.getActiveSession();
if (session == null) {
if (savedInstanceState != null) {
session = Session.restoreSession(getActivity(), null, statusCallback, savedInstanceState);
}
if (session == null) {
session = new Session(getActivity());
}
Session.setActiveSession(session);
if (session.getState().equals(SessionState.CREATED_TOKEN_LOADED)) {
session.openForRead(new Session.OpenRequest(this).setCallback(statusCallback));
}
}
updateView();
return rootView;
}
@Override
public void onStart() {
super.onStart();
Session.getActiveSession().addCallback(statusCallback);
}
@Override
public void onStop() {
super.onStop();
Session.getActiveSession().removeCallback(statusCallback);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
Session.getActiveSession().onActivityResult(getActivity(), requestCode, resultCode, data);
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
Session session = Session.getActiveSession();
Session.saveSession(session, outState);
}
private void updateView() {
Session session = Session.getActiveSession();
if (session.isOpened()) {
buttonLoginLogout.setImageResource(R.drawable.landing_btn_take_a_selfie);
buttonLoginLogout.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
((LandingPage)getActivity()).tabHost.setCurrentTab(2);
}
});
} else {
buttonLoginLogout.setImageResource(R.drawable.landing_btn_connect_facebook);
buttonLoginLogout.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) { onClickLogin(); }
});
}
}
private void onClickLogin() {
Session session = Session.getActiveSession();
if (!session.isOpened() && !session.isClosed()) {
session.openForRead(new Session.OpenRequest(this).setCallback(statusCallback));
} else {
Session.openActiveSession(getActivity(), this, true, statusCallback);
}
}
private class SessionStatusCallback implements Session.StatusCallback {
@Override
public void call(Session session, SessionState state, Exception exception) {
updateView();
}
}
public OnClickListener setChangeLangListener(final String lang) {
OnClickListener changeLangListener = new OnClickListener() {
@Override
public void onClick(View arg0) {
Configuration config = new Configuration(getResources()
.getConfiguration());
if (lang.equals("en")) {
config.locale = Locale.ENGLISH;
chi.setTextColor(oldColor);
eng.setTextColor(getActivity().getResources().getColor(
android.R.color.white));
} else {
config.locale = Locale.TRADITIONAL_CHINESE;
eng.setTextColor(oldColor);
chi.setTextColor(getActivity().getResources().getColor(
android.R.color.white));
}
getResources().updateConfiguration(config,getResources().getDisplayMetrics());
onConfigurationChanged(config);
}
};
return changeLangListener;
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
Intent intent = getActivity().getIntent();
intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
getActivity().finish();
startActivity(intent);
}
}
图片分享活动：
public class SharePicForm extends Activity {
private final String TAG = "SharePicForm";
public ImageView photoArea;
public ImageView sharePhotoBtn;
public EditText shareContent;
public Bitmap mBitmap;
public Context ctx;
public String shareTxt;
//Facebook share
private Session.StatusCallback statusCallback = new SessionStatusCallback();
private PendingAction pendingAction = PendingAction.NONE;
private enum PendingAction {
NONE, POST_PHOTO
}
public static boolean isShowForm = true;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.share_pic_form);
ctx = this;
Utility.setHeader(this,R.string.selfie_header,false);
photoArea = (ImageView) findViewById(R.id.photo_area);
shareContent = (EditText) findViewById(R.id.share_content);
Intent intent = getIntent();
String fileUri = (String) intent.getStringExtra("photo");
FileInputStream inputStream;
try {
File imgSelected = new File(fileUri);
if (imgSelected.exists()) {
inputStream = new FileInputStream(imgSelected);
mBitmap = Utility.decodeBitmap(inputStream, 1280, 960);
photoArea.setImageBitmap(mBitmap);
sharePhotoBtn = (ImageView) findViewById(R.id.share_submit);
sharePhotoBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (mBitmap != null && FormValidation.hasText(shareContent)) {
try {
File imageToShare = saveBitmapToStorage();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
shareTxt = shareContent.getText().toString();
Session session = Session.getActiveSession();
if (session.isOpened()) {
Log.d(TAG,"logined");
performPublish(PendingAction.POST_PHOTO);
} else {
Log.d(TAG,"not logined");
onClickLogin();
}
//new FormSubmit(ctx).execute("shareImg",imageToShare, textToShare);
}
}
});
} else {
Utility.showDialog(ctx,"error");
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private File saveBitmapToStorage () throws IOException{
String path = Environment.getExternalStorageDirectory().toString();
File outputFile = new File(path, "temp.jpg");
FileOutputStream out = new FileOutputStream(outputFile);
mBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
out.flush();
out.close();
return outputFile;
}
//Facebook share
private void onClickLogin() {
Session session = Session.getActiveSession();
if (!session.isOpened() && !session.isClosed()) {
session.openForRead(new Session.OpenRequest(this).setCallback(statusCallback));
} else {
Session.openActiveSession(this, true, statusCallback);
}
}
private class SessionStatusCallback implements Session.StatusCallback {
@Override
public void call(Session session, SessionState state, Exception exception) {
if (pendingAction != PendingAction.NONE &&
(exception instanceof FacebookOperationCanceledException ||
exception instanceof FacebookAuthorizationException)) {
new AlertDialog.Builder(ctx)
.setTitle("Cancel")
.setMessage("No grant permission")
.setPositiveButton("ok", null)
.show();
pendingAction = PendingAction.NONE;
} else if (state == SessionState.OPENED_TOKEN_UPDATED) {
handlePendingAction();
}
performPublish(PendingAction.POST_PHOTO);
}
}
private boolean hasPublishPermission() {
Session session = Session.getActiveSession();
return session != null
&& session.getPermissions().contains("publish_actions");
}
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;
if (previouslyPendingAction == PendingAction.POST_PHOTO)
postPhoto();
}
private void performPublish(PendingAction action) {
Session session = Session.getActiveSession();
if (session != null) {
Log.d(TAG,"session != null");
pendingAction = action;
if (hasPublishPermission()) {
Log.d(TAG,"Has permission");
// We can do the action right away.
handlePendingAction();
return;
} else if (session.isOpened()) {
Log.d(TAG,"No permission");
// We need to get new permissions, then complete the action when we get called back.
session.requestNewPublishPermissions(new Session.NewPermissionsRequest(this, "publish_actions"));
return;
}
Log.d(TAG,"Session not open");
}
Log.d(TAG,"Session null");
}
private void postPhoto() {
Log.d(TAG,"postPhoto: " + hasPublishPermission());
if (hasPublishPermission()) {
if (mBitmap != null) {
Request request = Request.newUploadPhotoRequest(
Session.getActiveSession(),mBitmap, new Request.Callback() {
@Override
public void onCompleted(Response response) {
showPublishResult(response.getError());
}
});
Bundle params = request.getParameters();
if (shareTxt != null)
params.putString("message", shareTxt);
request.setParameters(params);
request.executeAsync();
}
} else {
pendingAction = PendingAction.POST_PHOTO;
}
}
private void showPublishResult(FacebookRequestError error) {
if (error == null) {
Utility.showDialog(ctx,"success_photo");
} else {
Utility.showDialog(ctx,"error");
}
}
}
感谢您的帮助。任何帮助都表示感谢。
记录共享图像活动
02-11 02:18:17.914: D/SharePicForm(21646): logined
02-11 02:18:17.914: D/SharePicForm(21646): session != null
02-11 02:18:17.914: D/SharePicForm(21646): No permission
答案 0 :(得分：0)
你错过了片段中的'UiLifecycleHelper'实现：
private UiLifecycleHelper uiHelper;
private Session.StatusCallback callback = new Session.StatusCallback() {
@Override
public void call(Session session, SessionState state, Exception exception) {
//Do what ever you want to do here
}
};
onCreate(....)
{
uiHelper = new UiLifecycleHelper(VideoShareActivity.this, callback);
uiHelper.onCreate(savedInstanceState);
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
uiHelper.onPause();
}
@Override
public void onDestroy() {
super.onDestroy();
uiHelper.onDestroy();
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
uiHelper.onSaveInstanceState(outState);
}
现在您的Session.getActiveSession()不应该返回null。
我希望这会有所帮助。