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POFacebook Android SDK & java.lang.NullPointerException
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copied!<p>I am having trouble opening an active facebook session in my android app as per the tutorial posted at <a href="https://developers.facebook.com/docs/android/getting-started/facebook-sdk-for-android/" rel="noreferrer">https://developers.facebook.com/docs/android/getting-started/facebook-sdk-for-android/</a></p> <p>I have been struggling with this for quite some time now without any luck! I will be glad if one of you would point me in the right direction! (<em>I bet the error is with some setup on my side, but I am unable to spot it</em>)</p> <p>Here is the error I am seeing after calling Session.openActiveSession(this, true, new Session.StatusCallback() in the onCreate of my activity (I am pretty much following the steps given in facevook developer tutorials)</p> <hr> <p><strong>EDIT :</strong> The following warning message is logged first and followed by the error message in the subsequent screen shot</p> <blockquote> <p>09-03 19:26:22.726: W/Bundle(17458): Key <strong>com.facebook.platform.protocol.PROTOCOL_VERSION expected String but value was a java.lang.Integer. The default value was returned.</strong> 09-03 19:26:22.736: W/Bundle(17458): Attempt to cast generated internal exception: 09-03 19:26:22.736: W/Bundle(17458): java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String 09-03 19:26:22.736: W/Bundle(17458): at android.os.Bundle.getString(Bundle.java:1061) 09-03 19:26:22.736: W/Bundle(17458): at android.content.Intent.getStringExtra(Intent.java:4466) 09-03 19:26:22.736: W/Bundle(17458): at com.facebook.AuthorizationClient$KatanaLoginDialogAuthHandler.tryAuthorize(AuthorizationClient.java:821) 09-03 19:26:22.736: W/Bundle(17458): at com.facebook.AuthorizationClient.tryCurrentHandler(AuthorizationClient.java:272)</p> </blockquote> <p><img src="https://i.stack.imgur.com/6Xrnv.png" alt="enter image description here"></p> <hr> <blockquote> <p>09-02 22:55:04.110: E/AndroidRuntime(13287): FATAL EXCEPTION: main 09-02 22:55:04.110: E/AndroidRuntime(13287): java.lang.RuntimeException: <strong>Unable to resume activity</strong> {com.good.amrfbintegration/<strong>com.facebook.LoginActivity</strong>}: <strong>java.lang.NullPointerException</strong> 09-02 22:55:04.110: E/AndroidRuntime(13287): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3036) 09-02 22:55:04.110: E/AndroidRuntime(13287): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3077) 09-02 22:55:04.110: E/AndroidRuntime(13287): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2373)</p> </blockquote> <p><img src="https://i.stack.imgur.com/CZBPw.png" alt="enter image description here"></p> <p>Here is what I have done so far</p> <p>Updated the App on Facebook with the following information (I have used the hashkey generated using my machine's debug keystore)</p> <p><img src="https://i.stack.imgur.com/We43W.png" alt="enter image description here"></p> <p>Here are the relevant info from my manifest file (@string/app_id is the App Id from facebook dev portal)</p> <p><img src="https://i.stack.imgur.com/qj7yR.png" alt="enter image description here"></p> <p>I added a reference to the Facebook SDK to my project in this way</p> <p><img src="https://i.stack.imgur.com/JVsSZ.png" alt="enter image description here"></p> <p>Here is the code in my OnCreate method of the main activity</p> <pre><code>@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); activity = this; Session.openActiveSession(this, true, new Session.StatusCallback() { @Override public void call(Session session, SessionState state, Exception exception) { if (session.isOpened()) { Toast.makeText(activity, "Connected to Fb", Toast.LENGTH_SHORT).show(); } }}); } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); Session.getActiveSession().onActivityResult(this, requestCode, resultCode, data); } </code></pre> <p>On executing the Session.openActiveSession, logcat display the error shown in my first screenshot.</p> <p>The Session.StatusCallback()'s call method gets executed once (while session has a state 'opening') but the app crashes the subsequent time. here is what I see before the App crashes</p> <p><img src="https://i.stack.imgur.com/FacYu.png" alt="enter image description here"></p> <p>Any assistance would be greatly appreciated!</p>

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