Just set paddingTop and paddingBottom. It works for me.

    &lt;com.facebook.login.widget.LoginButton
            android:id=&quot;@+id/login_facebook_button&quot;
            android:layout_width=&quot;match_parent&quot;
            android:layout_height=&quot;wrap_content&quot;
            android:paddingTop=&quot;15dp&quot;
            android:paddingBottom=&quot;15dp&quot;
            android:layout_marginRight=&quot;30dp&quot;
            android:layout_marginLeft=&quot;30dp&quot;/&gt;

For `Facebook SDK v4.x` (*or rather than using separate xml style or programmatically*)

The `height` of button is decided by its `padding` and `textSize`.

So if you want to increase button size, do it something like this

    &lt;com.facebook.login.widget.LoginButton
    xmlns:facebook=&quot;http://schemas.android.com/apk/res-auto&quot;
    facebook:com_facebook_login_text=&quot;Log in with Facebook&quot;
    android:id=&quot;@+id/login_button&quot;
    android:textSize=&quot;15sp&quot;
    android:paddingTop=&quot;15dp&quot; &lt;!--increase more until it matches ur requirement --&gt;
    android:paddingBottom=&quot;15dp&quot;&gt;

Hope it helps!!


There is no need to create a custom `LoginButton`.

You can just change the `LoginButton` parameters programmatically as described [here][1].


  [1]: https://stackoverflow.com/a/29479735/954811

I have been studying apache kafka for a month now. I am however, stuck at a point now. My use case is, I have two or more consumer processes running on different machines. I ran a few tests in which I published 10,000 messages in kafka server. Then while processing these messages I killed one of the consumer processes and restarted it. Consumers were writing processed messages in a file. So after consumption finished, file was showing more than 10k messages. So some messages were duplicated. 

In consumer process I have disabled auto commit. Consumers manually commit offsets batch wise. So for e.g if 100 messages are written to file, consumer commits offsets. When single consumer process is running and it crashes and recovers duplication is avoided in this manner. But when more than one consumers are running and one of them crashes and recovers, it writes duplicate messages to file.

Is there any effective strategy to avoid these duplicate messages? 

Effective strategy to avoid duplicate messages in apache kafka consumer

In Spark version *1.2.0* one could use `subtract` with 2 `SchemRDD`s to end up with only the different content from the first one

    val onlyNewData = todaySchemaRDD.subtract(yesterdaySchemaRDD)

`onlyNewData` contains the rows in `todaySchemRDD` that do not exist in `yesterdaySchemaRDD`.

How can this be achieved with `DataFrames` in Spark version *1.3.0*?

Spark: subtract two DataFrames

I already tried several answers I could find but none of them worked with the latest Facebook Android SDK version 4.0.

How can I change the layout height with the latest SDK?

How to change the height of the &#39;Log in with Facebook&#39; button?

<p>I already tried several answers I could find but none of them worked with the latest Facebook Android SDK version 4.0.</p>
<p>How can I change the layout height with the latest SDK?</p>


I couldn&#39;t find any better example for using `RecyclerView` with `StaggeredGridLayoutManager`. Not even in [Android Docs][1].

&gt;**Q1.** I need some examples which can give proper explanation about how to use `RecyclerView` with `StaggeredGridLayoutManager`.
&gt;
&gt;**Q2.** Can anyone tell me if it is possible to create following layout using `RecyclerView` with `StaggeredGridLayoutManager` 

![example][2]

So far i have found this [link][3] which is not at all useful.

I also found this [link][4] for cardslib but it is too much complex in implementation and has too much dependencies which will increase my app size unnecessarily.


  [1]: https://developer.android.com/reference/android/support/v7/widget/StaggeredGridLayoutManager.html
  [2]: http://i.stack.imgur.com/363QI.png
  [3]: http://android-pratap.blogspot.in/2015/01/using-linearlayoutmanager.html
  [4]: https://github.com/gabrielemariotti/cardslib

No good example about RecyclerView and StaggeredGridLayoutManager in Android Docs

I made an app  and put that on Playstore. Is there a way I can change the screenshots of the app? Or if it is not possible will the update version remove the previous version and screenshots?

Can I change screenshots of the app after published?

I have an android application that need device current location (latitude and longitude). I&#39;ve tried some tutorial on the net and specially some solutions from stack overflow, but they doesn&#39;t work well for me. My requirement is so simple: First I need it to be fast and need the location once when I the fragment starts. Second I need it to be as precise as possible, I mean it should use GPS first if GPS is not available then use Network provider.

For example, I&#39;ve tried [this solution](https://stackoverflow.com/questions/3145089/what-is-the-simplest-and-most-robust-way-to-get-the-users-current-location-in-a) but it return null after 30 second, but I know there is some all the things is ok because google map and other application works well !!! 

Something that almost all the answers suggest is to use getLastKnownLocation(), but I suppose it&#39;s not the current and I don&#39;t want it if it is so.

can anyone suggest me some kind of simple and fast way to get the location just ONCE ?!


get the current location fast and once in android

I have known the difference among **DP**, **SP** and **PX**. And after searching this topic, I found nothing satisfying me completely. Maybe this post is a duplicate, but I still want to know what is the formula of converting from **DP** to **PX**, and **DP** to **SP**, from **SP** to **PX**, from **PX** to **SP**, from **SP** to **DP**, from **DP** to **SP**? I have known some codes to do this, but they are imperfect.

How to convert DP, PX, SP among each other, especially DP and SP?

In old code when I was using `ListView` with custom adapter I could get item with this code.

    Message msg = (Message) adapter.getItem(poistion);

   Now I am implementing `RecyclerView`. How can I get item from `RecyclerView.adapter`?

How to get item from RecyclerView adapter in Android

I&#39;m upgrading my use of the Facebook SDK to the latest version. The following code is prety much lifted line by line from Facebook&#39;s own examples, which can be found here: https://developers.facebook.com/docs/facebook-login/android/v2.3



    import android.content.Intent;
    import android.os.Bundle;
    import android.support.v4.app.FragmentActivity;
    import android.util.Log;

    import com.facebook.CallbackManager;
    import com.facebook.FacebookCallback;
    import com.facebook.FacebookException;
    import com.facebook.FacebookSdk;
    import com.facebook.login.LoginManager;
    import com.facebook.login.LoginResult;

    import java.util.Arrays;

    public class TestFb extends FragmentActivity{

        CallbackManager callbackManager;
        FacebookController fbController;

        @Override
        public void onCreate(final Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

        fbController = FacebookController.getInstance(this);

        FacebookSdk.sdkInitialize(getApplicationContext());
        final LoginManager loginManager = LoginManager.getInstance();

        callbackManager = CallbackManager.Factory.create();
        loginManager.registerCallback(callbackManager, new FacebookCallback&lt;LoginResult&gt;() {
                @Override
                public void onSuccess(LoginResult loginResult) {
                    String userId = loginResult.getAccessToken().getUserId();
                    String token = loginResult.getAccessToken().getToken();
                    Log.d(&quot;fb&quot;, &quot;ID: &quot; + userId + &quot; Token: &quot;+ token);
                }

                @Override
                public void onCancel() {
                    finish();
                }

                @Override
                public void onError(FacebookException e) {
                    Log.d(&quot;fb&quot;, &quot;Exception: &quot; + e.getMessage());
                }
            });
            loginManager.logInWithReadPermissions(this, Arrays.asList(new String[]{&quot;email&quot;, &quot;user_likes&quot;}));
        }

        @Override
        protected void onActivityResult(int requestCode, int resultCode, Intent data) {
            super.onActivityResult(requestCode, resultCode, data);
            callbackManager.onActivityResult(requestCode, resultCode, data);
        }
    }


The problem is that this does not work when the user has already logged in to the facebook app on his phone. In that case, this gives a &quot;User logged in as different Facebook user&quot; error. 

I would think that given that there already is an active Facebook account on the device, a new one cannot be created. But if that was the case, should I get the user&#39;s ID and token from the existing account? I couldn&#39;t seem to be able to find any mention of this issue on Facebook&#39;s documentation pages.

Using facebook SDK on Android gives &quot;User logged in as different Facebook user.&quot; error

I have followed the instructions here: 

https://stackoverflow.com/questions/21329250/the-developers-of-this-app-have-not-set-up-this-app-properly-for-facebook-login/26135600#26135600

Made my app public and the circle is green so the app is public.

But when I try to login, I go to the Facebook app, it asks me to login which I do and then I get this message:

App Not Setup: This app is still in development mode, and you don&#39;t have access to it. Switch to a registered test user or ask an app admin for permissions.

BTW: I am the admin

Any help is much appreciated. I am using SeattleClouds and this happens on both iOS and Android.


App not setup: This app is still in development mode

I&#39;m using Laravel Socialite to add a Facebook connect button on a website. Sometimes, I&#39;ve got this error on callback:

    exception &#39;Laravel\Socialite\Two\InvalidStateException&#39; 
    in /example/vendor/laravel/socialite/src/Two/AbstractProvider.php:161

I don&#39;t know what it mean and did not found anything yet about this error. The real problem is it seems to be a random exception (don&#39;t understood why it happens). So what this error means and how to avoid it?

It seems it&#39;s not the same problem as https://stackoverflow.com/questions/29629287/laravel-5-geting-invalidstateexception-in-abstractprovider-php, cause in my case it&#39;s random.

Laravel Socialite: InvalidStateException

I keep getting 

&gt; &quot;Error Domain=com.facebook.sdk.login Code=308 &quot;The operation couldn’t
&gt; be completed. (com.facebook.sdk.login error 308.)&quot;&quot;

 upon trying to login with Facebook from my device.

My code works on the simulator, but not on an actual device. Has anyone ran into this error code before? I&#39;ll be more than happy to share code upon request.

FBSDK Login Error Code: 308 in Objective-C

Many images uploaded on Facebook contain IPTC/IIM fields which are apparently automatically added during the upload process:

 - *Special Instruction*, a string beginning with &quot;FBMD&quot; 
 - *Original Transmission Reference*.

See for example this (personnal) image uploaded on Facebook and decoded using Jeffrey&#39;s Exif Viewer:
http://exif.regex.info/exif.cgi 

What is this?

IPTC metadata automatically added to uploaded images on Facebook

Is it really intended that the Toolbar in a AppBarLayout is scrollable although the main container with the &quot;appbar_scrolling_view_behavior&quot; has not enough content to really scroll?

What I have tested so far:  
When I use a NestedScrollView (with &quot;wrap_content&quot; attribute) as main container and a TextView as child, the AppBarLayout works properly and does not scroll.

However, when I use a RecyclerView with only a few entries and the &quot;wrap_content&quot; attribute (so that there is no need to scroll), the Toolbar in the AppBarLayout is scrollable even though the RecyclerView never receives a scroll event (tested with a OnScrollChangeListener).

Here&#39;s my layout code:

    &lt;android.support.design.widget.CoordinatorLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;
        android:id=&quot;@+id/coordinatorLayout&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;match_parent&quot;&gt;

        &lt;android.support.design.widget.AppBarLayout
            android:id=&quot;@+id/appBarLayout&quot;
            android:layout_width=&quot;match_parent&quot;
            android:layout_height=&quot;wrap_content&quot;&gt;

            &lt;android.support.v7.widget.Toolbar
                android:id=&quot;@+id/toolbar&quot;
                android:layout_width=&quot;match_parent&quot;
                android:layout_height=&quot;?attr/actionBarSize&quot;
                android:background=&quot;?attr/colorPrimary&quot;
                app:layout_scrollFlags=&quot;scroll|enterAlways&quot;
                app:theme=&quot;@style/ToolbarStyle&quot; /&gt;
        &lt;/android.support.design.widget.AppBarLayout&gt;

        &lt;android.support.v7.widget.RecyclerView
            android:id=&quot;@+id/recycler&quot;
            android:layout_width=&quot;wrap_content&quot;
            android:layout_height=&quot;wrap_content&quot;
            app:layout_behavior=&quot;@string/appbar_scrolling_view_behavior&quot; /&gt;
    &lt;/android.support.design.widget.CoordinatorLayout&gt;

With the following effect that the toolbar is scrollable although it&#39;s not necessary:

[![][1]][1]

I&#39;ve also found a way to deal with this by checking if all RecyclerView items are visible and using the setNestedScrollingEnabled() method of the RecyclerView.  
Nevertheless, it does seem more like a bug as intended to me. Any opinions? :D

**EDIT #1:**
============
For people who are might be interested in my current solution, I had to put the setNestedScrollingEnabled() logic in the postDelayed() method of a Handler with 5 ms delay due to the LayoutManager which always returned -1 when calling the methods to find out whether the first and the last item is visible.  
I use this code in the onStart() method (after my RecyclerView has been initialized) and every time after a content change of the RecyclerView occurs.

    final LinearLayoutManager layoutManager = (LinearLayoutManager) mRecyclerView.getLayoutManager();
    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            //no items in the RecyclerView
            if (mRecyclerView.getAdapter().getItemCount() == 0)
                mRecyclerView.setNestedScrollingEnabled(false);
            //if the first and the last item is visible
            else if (layoutManager.findFirstCompletelyVisibleItemPosition() == 0
                    &amp;&amp; layoutManager.findLastCompletelyVisibleItemPosition() == mRecyclerView.getAdapter().getItemCount() - 1)
                mRecyclerView.setNestedScrollingEnabled(false);
            else
                mRecyclerView.setNestedScrollingEnabled(true);
        }
    }, 5);

**EDIT #2:**
============
I just played around with a new app and it seems that this (unintended) behavior has been fixed in support library version 23.3.0 (or even earlier). Thus, there is no need for workarounds anymore!

  [1]: http://i.stack.imgur.com/Wx1C2.gif

Toolbar in AppBarLayout is scrollable although RecyclerView has not enough content to scroll

* Getting Unknown attribute error on all android tag. 

* In layout XML, Auto suggestion is not showing all attributes (like layout_width, layout_height, orientation, orientation &amp; all others android attributes.)

Here is a Snap shot

[![enter image description here][1]][1]

[![enter image description here][2]][2]
  [1]: http://i.stack.imgur.com/Igpr9.png
  [2]: http://i.stack.imgur.com/MN3lK.png

Things i have done to resolve this issue.

* Clean Build &amp; Rebuild
* Deleted .idea file
* Invalidated Caches/ Restart.. option
* Turn On Power Save Mode.

SDk is up to date. 

In App Level Gridle

    apply plugin: &#39;com.android.application&#39;

    android {
        compileSdkVersion 23
        buildToolsVersion &quot;23.0.2&quot;

        defaultConfig {
            applicationId &quot;com.example.abhishek.ondemandservice&quot;
            minSdkVersion 15
            targetSdkVersion 23
            versionCode 1
            versionName &quot;1.0&quot;
        }
        buildTypes {
            release {
                minifyEnabled false
                proguardFiles getDefaultProguardFile(&#39;proguard-android.txt&#39;),     &#39;proguard-rules.pro&#39;
            }
        }
    }

Application level Gride.

    buildscript {
        repositories {
            maven { url &quot;http://dl.bintray.com/populov/maven&quot; }
            jcenter()
            mavenCentral()
        }
        dependencies {
            classpath &#39;com.android.tools.build:gradle:1.5.0&#39;

            // NOTE: Do not place your application dependencies here; they belong
            // in the individual module build.gradle files
        }
    }

    allprojects {
        repositories {
            maven { url &quot;http://dl.bintray.com/populov/maven&quot; }
            jcenter()
            mavenCentral()
        }
    }

Unknown attribute android:layout_width, layout_height, id, gravity, layout_gravity, padding

    &lt;android.support.v7.widget.CardView
        android:id=&quot;@+id/card_view&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;wrap_content&quot;
        android:layout_marginLeft=&quot;@dimen/card_outer_padding&quot;
        android:layout_marginTop=&quot;@dimen/card_outer_padding&quot;
        android:layout_marginRight=&quot;@dimen/card_outer_padding&quot;
        android:layout_marginBottom=&#39;@{model.cardBottomMargin}&#39;
        android:foreground=&quot;?attr/selectableItemBackground&quot;
        android:onClick=&quot;@{model::onCardClick}&quot;
        app:cardElevation=&quot;2dp&quot;
        app:cardCornerRadius=&quot;2dp&quot;
        app:cardUseCompatPadding=&quot;true&quot;&gt;
    &lt;/android.support.v7.widget.CardView&gt;

I got this error message 

Cannot resolve symbol `?attr/selectableItemBackground`
Validates resource references inside Android XML files.


    &lt;TextView
        android:id=&quot;@+id/country_name&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;wrap_content&quot;
        android:layout_marginRight=&quot;40dp&quot;
        android:text=&quot;@{model.name}&quot;
        style=&quot;@style/TextAppearance.AppCompat.Headline&quot;
        tools:text=&quot;Country&quot;/&gt;

And, I got a similar error for the above as well

Cannot resolve symbol &#39;@style/TextAppearance.AppCompat.Headline&#39;  
Validates resource references inside Android XML files.

Any pointer would be great! Thank you!
It seems to be related to this [thread][1] but no solution was provided:



  [1]: https://stackoverflow.com/questions/17870303/ide-cannot-resolve-style-theme-appcompat-when-using-v7-compatibility-support

Android Cannot resolve symbol &#39;?attr/selectableItemBackground&#39;

Using the [Fonts in XML][1] feature you can specify various font weights for a font family. For example:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;font-family xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
                 xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;&gt;

        &lt;font android:font=&quot;@font/archivo_narrow_regular&quot; android:fontWeight=&quot;400&quot; android:fontStyle=&quot;normal&quot;
            app:font=&quot;@font/archivo_narrow_regular&quot; app:fontWeight=&quot;400&quot; app:fontStyle=&quot;normal&quot;/&gt;

        &lt;font android:font=&quot;@font/archivo_narrow_regular_italic&quot; android:fontWeight=&quot;400&quot; android:fontStyle=&quot;italic&quot;
            app:font=&quot;@font/archivo_narrow_regular_italic&quot; app:fontWeight=&quot;400&quot; app:fontStyle=&quot;italic&quot;/&gt;

        &lt;font android:font=&quot;@font/archivo_narrow_medium&quot; android:fontWeight=&quot;500&quot; android:fontStyle=&quot;normal&quot;
            app:font=&quot;@font/archivo_narrow_medium&quot; app:fontWeight=&quot;500&quot; app:fontStyle=&quot;normal&quot;/&gt;

        &lt;font android:font=&quot;@font/archivo_narrow_medium_italic&quot; android:fontWeight=&quot;500&quot; android:fontStyle=&quot;italic&quot;
            app:font=&quot;@font/archivo_narrow_medium_italic&quot; app:fontWeight=&quot;500&quot; app:fontStyle=&quot;italic&quot;/&gt;

        &lt;font android:font=&quot;@font/archivo_narrow_semibold&quot; android:fontWeight=&quot;600&quot; android:fontStyle=&quot;normal&quot;
            app:font=&quot;@font/archivo_narrow_semibold&quot; app:fontWeight=&quot;600&quot; app:fontStyle=&quot;normal&quot;/&gt;

        &lt;font android:font=&quot;@font/archivo_narrow_semibold_italic&quot; android:fontWeight=&quot;600&quot; android:fontStyle=&quot;italic&quot;
            app:font=&quot;@font/archivo_narrow_semibold_italic&quot; app:fontWeight=&quot;600&quot; app:fontStyle=&quot;italic&quot;/&gt;

        &lt;font android:font=&quot;@font/archivo_narrow_bold&quot; android:fontWeight=&quot;700&quot; android:fontStyle=&quot;normal&quot;
            app:font=&quot;@font/archivo_narrow_bold&quot; app:fontWeight=&quot;700&quot; app:fontStyle=&quot;normal&quot;/&gt;

        &lt;font android:font=&quot;@font/archivo_narrow_bold_italic&quot; android:fontWeight=&quot;700&quot; android:fontStyle=&quot;italic&quot;
            app:font=&quot;@font/archivo_narrow_bold_italic&quot; app:fontWeight=&quot;700&quot; app:fontStyle=&quot;italic&quot;/&gt;

    &lt;/font-family&gt;

But I cannot figure out how to actually make use of each of these weights; either in an XML (layout/style) file, or in Java code. Their is no `fontWeight` attribute available for `TextView`, and the [`Typeface`][2] object created from [`ResourcesCompat.getFont(context, R.font.archivo_narrow)`][3] has no mention of font weights.

I realize that I can just specify the specific font resource (i.e. `R.font.archivo_narrow_semibold`), but then what is the point of having a `fontWeight` attribute in the `font-family`? 

---

### Update

A new static [`create(Typeface family, int weight, boolean italic)`][4] method was added in API Level 28, along with a [`getWeight()`][5] instance method. This finally makes it possible to make use of the `fontWeight` attribute in Java code; though only for API Level 28 and above, I haven&#39;t found any analogs in the support library.

This is useful—and shows that the `fontWeight` attribute didn&#39;t serve any purpose in the past—but I would really like to be able to use the weight in XML styling. 


  [1]: https://developer.android.com/guide/topics/ui/look-and-feel/fonts-in-xml.html
  [2]: https://developer.android.com/reference/android/graphics/Typeface.html#create(android.graphics.Typeface,%20int)
  [3]: https://developer.android.com/reference/android/support/v4/content/res/ResourcesCompat.html
  [4]: https://developer.android.com/reference/android/graphics/Typeface.html#create(android.graphics.Typeface,%20int,%20boolean)
  [5]: https://developer.android.com/reference/android/graphics/Typeface.html#getWeight()

How to use specified weights for fonts in XML

Hey I know this was asked before, but none of the solutions seem to help. I&#39;m using first time Facebook SDK in my application.
    
What I&#39;ve tried:

    
I had tried most of the things found on **Internet** but did not get anything regarding this.
    
Here is my MainActivity.java:

     public class MainActivity extends Activity {

      @Override
      protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        FacebookSdk.sdkInitialize(getApplicationContext());
       } 
    }


Here is My Activitymain.xml:

     &lt;LinearLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
    xmlns:tools=&quot;http://schemas.android.com/tools&quot;
    xmlns:facebook=&quot;http://schemas.android.com/apk/res-auto&quot;
    android:layout_width=&quot;match_parent&quot;
    android:layout_height=&quot;match_parent&quot;
    android:orientation=&quot;vertical&quot;&gt;
 
     &lt;com.facebook.login.widget.LoginButton
        android:id=&quot;@+id/connectWithFbButton&quot;
        android:layout_width=&quot;wrap_content&quot;
        android:layout_height=&quot;wrap_content&quot;
        android:layout_centerInParent=&quot;true&quot;
        android:layout_gravity=&quot;center_horizontal&quot;
        android:text=&quot;  connect_with_facebook&quot; /&gt; 
    &lt;/LinearLayout&gt;
see my **Logcat**:
    
     05-13 16:30:39.332: E/AndroidRuntime(10264): Caused by: The SDK has not been initialized, make sure to call FacebookSdk.sdkInitialize() first.

    
     


Facebook Sdk Has Not Been Initialized FacebookSdk.sdkInitialize()

I have updated iPhone 6 plus to iOS 9 beta and trying to perform Facebook login but each time its presenting UIWebView with Facebook login form. 

I have Facebook sdk 

    FB_IOS_SDK_VERSION_STRING @&quot;3.24.0&quot;
    FB_IOS_SDK_TARGET_PLATFORM_VERSION @&quot;v2.2&quot;

And I am using following methods to perform Facebook Login 

        NSArray *permissions = @[@&quot;email&quot;,@&quot;user_birthday&quot;,@&quot;public_profile&quot;];
        
        
         FBSessionStateHandler completionHandler = ^(FBSession *session, FBSessionState status, NSError *error) {
             [self sessionStateChanged:session state:status error:error];
         };
         
         if ([FBSession activeSession].state == FBSessionStateCreatedTokenLoaded) {
         // we have a cached token, so open the session
             [[FBSession activeSession]openWithBehavior:FBSessionLoginBehaviorUseSystemAccountIfPresent
                                     fromViewController:nil
                                      completionHandler:completionHandler];
         } else {
             
         [self clearAllUserInfo];
        [[NSURLCache sharedURLCache] removeAllCachedResponses];

         // create a new facebook session
         FBSession *fbSession = [[FBSession alloc] initWithPermissions:permissions];
         [FBSession setActiveSession:fbSession];
         [fbSession openWithBehavior:FBSessionLoginBehaviorUseSystemAccountIfPresent
                  fromViewController:nil
                   completionHandler:completionHandler];
         }


I have following setting under plist file

    	&lt;key&gt;LSApplicationQueriesSchemes&lt;/key&gt;
    	&lt;array&gt;
    		&lt;string&gt;fbapi&lt;/string&gt;
    		&lt;string&gt;fbapi20130214&lt;/string&gt;
    		&lt;string&gt;fbapi20130410&lt;/string&gt;
    		&lt;string&gt;fbapi20130702&lt;/string&gt;
    		&lt;string&gt;fbapi20131010&lt;/string&gt;
    		&lt;string&gt;fbapi20131219&lt;/string&gt;
    		&lt;string&gt;fbapi20140410&lt;/string&gt;
    		&lt;string&gt;fbapi20140116&lt;/string&gt;
    		&lt;string&gt;fbapi20150313&lt;/string&gt;
    		&lt;string&gt;fbapi20150629&lt;/string&gt;
    		&lt;string&gt;fb-messenger-api20140430&lt;/string&gt;
    		&lt;string&gt;fbauth&lt;/string&gt;
    		&lt;string&gt;fbauth2&lt;/string&gt;
       &lt;array&gt;
Please let me know what I am missing here. First it is checking for `iPhone device Setting-&gt; Facebook credentials` but never open Facebook app for login. Seems it does not recognize Facebook app installed on device.

Native Facebook app does not open with Facebook login in iOS 9

As I understand from the [Firebase Docs][1], if a user authenticates his account with a credential, he should strictly login by using the same credential if the credential is not linked with another one yet.

In other words, if I create an account by using Google sign in, and then (after sign out) try to login with Facebook credential by using the same email that is used for Google credential, I should see this exception in logcat:

&gt; &quot;An account already exists with the same email address but different
&gt; sign-in credentials. Sign in using a provider associated with this
&gt; email address.&quot;

And yes, I get this exception unsurprisingly. But if I create an account by using Facebook, and then try to login with Google credential, the provider of this account (Facebook) is converted to Google. This time authentication does not fail but it is not the expected result. I want to associate each user with a specific credential in a way. How should I fix this? You can see the code below: 

    public class SignInActivity extends AppCompatActivity implements GoogleApiClient.OnConnectionFailedListener,
            View.OnClickListener {
    
        private static final String TAG = &quot;SignInActivity&quot;;
        private static final int RC_SIGN_IN = 9001;
    
        private GoogleApiClient mGoogleApiClient;
        private FirebaseAuth mFirebaseAuth;
        private FirebaseAuth.AuthStateListener mFirebaseAuthListener;
    
        private CallbackManager mCallbackManager;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
    
            setContentView(R.layout.activity_sign_in);
    
            // Facebook Login
            FacebookSdk.sdkInitialize(getApplicationContext());
            mCallbackManager = CallbackManager.Factory.create();
    
            LoginButton mFacebookSignInButton = (LoginButton) findViewById(R.id.facebook_login_button);
            mFacebookSignInButton.setReadPermissions(&quot;email&quot;, &quot;public_profile&quot;);
    
            mFacebookSignInButton.registerCallback(mCallbackManager, new FacebookCallback&lt;LoginResult&gt;() {
                @Override
                public void onSuccess(LoginResult loginResult) {
                    Log.d(TAG, &quot;facebook:onSuccess:&quot; + loginResult);
                    firebaseAuthWithFacebook(loginResult.getAccessToken());
                }
    
                @Override
                public void onCancel() {
                    Log.d(TAG, &quot;facebook:onCancel&quot;);
                }
    
                @Override
                public void onError(FacebookException error) {
                    Log.d(TAG, &quot;facebook:onError&quot;, error);
                }
            });
    
            // Google Sign-In
            // Assign fields
            SignInButton mGoogleSignInButton = (SignInButton) findViewById(R.id.google_sign_in_button);
    
            // Set click listeners
            mGoogleSignInButton.setOnClickListener(this);
    
            GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                    .requestIdToken(getString(R.string.default_web_client_id))
                    .requestEmail()
                    .build();
            mGoogleApiClient = new GoogleApiClient.Builder(this)
                    .enableAutoManage(this /* FragmentActivity */, this /* OnConnectionFailedListener */)
                    .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
                    .build();
    
            // Initialize FirebaseAuth
            mFirebaseAuth = FirebaseAuth.getInstance();
    
            mFirebaseAuthListener = new FirebaseAuth.AuthStateListener() {
                @Override
                public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                    FirebaseUser user = firebaseAuth.getCurrentUser();
                    if (user != null) {
                        // User is signed in
                        Log.d(TAG, &quot;onAuthStateChanged:signed_in:&quot; + user.getUid());
                    } else {
                        // User is signed out
                        Log.d(TAG, &quot;onAuthStateChanged:signed_out&quot;);
                    }
                }
            };
        }
    
        @Override
        public void onStart() {
            super.onStart();
            mFirebaseAuth.addAuthStateListener(mFirebaseAuthListener);
        }
    
        @Override
        public void onStop() {
            super.onStop();
            if (mFirebaseAuthListener != null) {
                mFirebaseAuth.removeAuthStateListener(mFirebaseAuthListener);
            }
        }
    
        private void firebaseAuthWithGoogle(GoogleSignInAccount acct) {
            Log.d(TAG, &quot;firebaseAuthWithGooogle:&quot; + acct.getId());
            AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
            mFirebaseAuth.signInWithCredential(credential)
                    .addOnCompleteListener(this, new OnCompleteListener&lt;AuthResult&gt;() {
                        @Override
                        public void onComplete(@NonNull Task&lt;AuthResult&gt; task) {
                            Log.d(TAG, &quot;signInWithCredential:onComplete:&quot; + task.isSuccessful());
    
                            // If sign in fails, display a message to the user. If sign in succeeds
                            // the auth state listener will be notified and logic to handle the
                            // signed in user can be handled in the listener.
                            if (!task.isSuccessful()) {
                                Log.w(TAG, &quot;signInWithCredential&quot;, task.getException());
                                Toast.makeText(SignInActivity.this, &quot;Authentication failed.&quot;,
                                        Toast.LENGTH_SHORT).show();
                            } else {
                                startActivity(new Intent(SignInActivity.this, MainActivity.class));
                                finish();
                            }
                        }
                    });
        }
    
        private void firebaseAuthWithFacebook(AccessToken token) {
            Log.d(TAG, &quot;handleFacebookAccessToken:&quot; + token);
    
            final AuthCredential credential = FacebookAuthProvider.getCredential(token.getToken());
            mFirebaseAuth.signInWithCredential(credential)
                    .addOnCompleteListener(this, new OnCompleteListener&lt;AuthResult&gt;() {
                        @Override
                        public void onComplete(@NonNull Task&lt;AuthResult&gt; task) {
                            Log.d(TAG, &quot;signInWithCredential:onComplete:&quot; + task.isSuccessful());
    
                            // If sign in fails, display a message to the user. If sign in succeeds
                            // the auth state listener will be notified and logic to handle the
                            // signed in user can be handled in the listener.
                            if (!task.isSuccessful()) {
                                Log.w(TAG, &quot;signInWithCredential&quot;, task.getException());
                                Toast.makeText(SignInActivity.this, &quot;Authentication failed.&quot;,
                                        Toast.LENGTH_SHORT).show();
                            }
    
                            else {
                                startActivity(new Intent(SignInActivity.this, MainActivity.class));
                                finish();
                            }
                        }
                    });
        }
    
        /*
        private void handleFirebaseAuthResult(AuthResult authResult) {
            if (authResult != null) {
                // Welcome the user
                FirebaseUser user = authResult.getUser();
                Toast.makeText(this, &quot;Welcome &quot; + user.getEmail(), Toast.LENGTH_SHORT).show();
    
                // Go back to the main activity
                startActivity(new Intent(this, MainActivity.class));
            }
        }
        */
    
        @Override
        public void onClick(View v) {
            switch (v.getId()) {
                case R.id.google_sign_in_button:
                    signIn();
                    break;
                default:
                    return;
            }
        }
    
        private void signIn() {
            Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
            startActivityForResult(signInIntent, RC_SIGN_IN);
        }
    
        @Override
        public void onActivityResult(int requestCode, int resultCode, Intent data) {
            super.onActivityResult(requestCode, resultCode, data);
    
            mCallbackManager.onActivityResult(requestCode, resultCode, data);
    
            // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
            if (requestCode == RC_SIGN_IN) {
                GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
                if (result.isSuccess()) {
                    // Google Sign In was successful, authenticate with Firebase
                    GoogleSignInAccount account = result.getSignInAccount();
                    firebaseAuthWithGoogle(account);
                } else {
                    // Google Sign In failed
                    Log.e(TAG, &quot;Google Sign In failed.&quot;);
                }
            }
        }
    
        @Override
        public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
            // An unresolvable error has occurred and Google APIs (including Sign-In) will not
            // be available.
            Log.d(TAG, &quot;onConnectionFailed:&quot; + connectionResult);
            Toast.makeText(this, &quot;Google Play Services error.&quot;, Toast.LENGTH_SHORT).show();
        }
    }

  [1]: https://firebase.google.com/docs/auth/android/account-linking

Authentication using Facebook at first and then Google causes an error in Firebase for Android

I am getting this error. When I try to sign in with facebook to my app.
When I first time authentication it will correctly working. After I unistalled my application and now trying to sign in with Facebook on that I am getting this error.

**Another Issue** : After authenticate in device1 and try to login with facebook on device2 also same error is getting.

**Solution I Found :** when I remove App authentication from Facebook App Settings it is working in above scenario&#39;s but this is not an good solution how we can tell to users to do this action?

    btnFbLogin.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if(accessToken != null) {
                        boolean expires = accessToken.isExpired();
                        if(!expires) {
                            performFbLoginOrSignUp(accessToken);
                        }
                    } else {
                        LoginButton loginButton = (LoginButton) findViewById(R.id.login_button);
                        callbackManager = CallbackManager.Factory.create();
    
                        if (loginButton != null) {
                            loginButton.setReadPermissions(&quot;public_profile&quot;, &quot;email&quot;, &quot;user_friends&quot;);
    
                            if (CommonUtil.isConnectingToInternet(LoginActivity.this)) {
                                loginButton.performClick();
    
                                loginButton.setPressed(true);
    
                                loginButton.invalidate();
    
                                loginButton.registerCallback(callbackManager, mCallBack);
    
                                loginButton.setPressed(false);
    
                                loginButton.invalidate();
                            } 
                        }
                    }
                }
            });

[![Error page][1]][1]


In Facebook example also having an issue : 
[GitHub link of Facebook example][2]


  [1]: http://i.stack.imgur.com/FcoSum.png
  [2]: https://github.com/facebook/facebook-android-sdk/tree/master/samples/HelloFacebookSample

***Steps to reproduce*** : 

1. Launch the app Login with Facebook Authenticate FB profile.

2. Un_install the app and install again.

3. Now try to  Login with Facebook.
4. The above error will occur. because we already authenticated so need to access fb profile. but here we facing the issue.
5. Here already authenticated page is not showing.
6. I am using Native FB app with the device Xiaomi Redmi Note 3

Login Error: There is an error in logging you into this application. Please try again later

I&#39;&#39;m following this [Tutorial][1] but so far I can&#39;t make it work, though this is from a year ago or so...

I&#39;m using androidStudo 1.2.2 and FacebookSDK 4.

I want a simple login into facebook using a custom button, like the one shown in this image:

![Example][2]

Now, in the example from the tutorial I&#39;m having problems with the `Session` variable, it says it cannot resolve it, neither `getActivity()`

Has naybody tried this on FacebookSDK4.0?

Is that a correct approach or maybe there is something more updated?

Thanks in advance!

  [1]: http://www.rahuljiresal.com/2014/03/facebook-login-for-android-without-loginbutton/
  [2]: http://i.stack.imgur.com/iGmV5.png

Content Type	Original Author	Original Content on Stackoverflow
Question	Steffen	View Question on Stackoverflow
Solution 1 - Android	Tiago Martins	View Answer on Stackoverflow
Solution 2 - Android	Rafique Mohammed	View Answer on Stackoverflow
Solution 3 - Android	Steffen	View Answer on Stackoverflow

How to change the height of the 'Log in with Facebook' button?

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