imported FacebookSDK and yet missing class runtime exception

Question

I have the following android layout xml:

   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

       <com.facebook.widget.LoginButton
            android:id="@+id/authButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:layout_marginTop="30dp"
            />
    </LinearLayout>

However I get runtime error:

which can even be seen in the Graphical editor:

But I don't get why, as I have imported the FacebookSDK properly (i think)

and when I do cmd + right click on the XML I get to the right class implementation

`package com.facebook.widget;

public class LoginButton extends Button {`

What am I missing?

Answer 1

I have recently done Facebook Android Integration from this link.

When i imported FacebookSDK into my project, I got error in console of android-support-v4.jar mismatch. Because i have 2 android-support-v4.jar files in FacebookSDK Project and in my Project. Due to Which an error is coming at runtime of ClassDefNotFound. So I Deleted one of the jar file.

Check this out if it helps you.

And the SDK provided on the link was not working well. So tried out with different SDK from this Link. And got success with SDK 3.0.2.

I hope this will help you out.