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POAndroid Facebook API - StringBuilder returns NULL
 

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    <p>I'm working through the Android Facebook tutorial here: <a href="https://developers.facebook.com/docs/howtos/androidsdk/3.0/fetch-user-data/" rel="nofollow">https://developers.facebook.com/docs/howtos/androidsdk/3.0/fetch-user-data/</a></p> <p>In this chunk of code: </p> <pre><code>private String buildUserInfoDisplay(GraphUser user) { StringBuilder userInfo = new StringBuilder(""); Log.d("Graphuser:user",user.toString()); Log.d("StringBuilder:userInfo",userInfo.toString()); // Example: typed access (name) // - no special permissions required Log.d("Name: ",String.format("Name: %s\n\n", user.getName())); userInfo.append(String.format("Name: %s\n\n", user.getName())); // Example: typed access (birthday) // - requires user_birthday permission //userInfo.append(String.format("Birthday: %s\n\n", user.getBirthday())); // Example: partially typed access, to location field, // name key (location) // - requires user_location permission //userInfo.append(String.format("Location: %s\n\n", user.getLocation().getProperty("name"))); // Example: access via property name (locale) // - no special permissions required userInfo.append(String.format("Locale: %s\n\n", user.getProperty("locale"))); // Get a list of languages from an interface that // extends the GraphUser interface and that returns // a GraphObject list of MyGraphLanguage objects. GraphObjectList&lt;MyGraphLanguage&gt; languages = (user.cast(MyGraphUser.class)).getLanguages(); Log.d("Languages",languages.toString()); if (languages.size() &gt; 0) { ArrayList&lt;String&gt; languageNames = new ArrayList&lt;String&gt; (); // Iterate through the list of languages for (MyGraphLanguage language : languages) { // Add the language name to a list. Use the name // getter method to get access to the name field. languageNames.add(language.getName()); } //userInfo.append(String.format("Languages: %s\n\n", languageNames.toString())); } return userInfo.toString(); } </code></pre> <p>The <strong>userInfo.append()</strong> function results in a null pointer exception. Has anyone run into this before? I have checked that I have the same code as what is in the tutorial. </p> <p>/* Update - Append Logcat */</p> <pre><code>03-16 17:59:18.154: W/dalvikvm(1189): threadid=1: thread exiting with uncaught exception (group=0x40a13300) 03-16 17:59:18.204: E/AndroidRuntime(1189): FATAL EXCEPTION: main 03-16 17:59:18.204: E/AndroidRuntime(1189): java.lang.NullPointerException 03-16 17:59:18.204: E/AndroidRuntime(1189): at net.myname.myapp.MainFragment.buildUserInfoDisplay(MainFragment.java:84) 03-16 17:59:18.204: E/AndroidRuntime(1189): at net.myname.myapp.MainFragment.access$2(MainFragment.java:56) 03-16 17:59:18.204: E/AndroidRuntime(1189): at net.myname.myapp.MainFragment$2.onCompleted(MainFragment.java:125) 03-16 17:59:18.204: E/AndroidRuntime(1189): at com.facebook.Request$1.onCompleted(Request.java:264) 03-16 17:59:18.204: E/AndroidRuntime(1189): at com.facebook.Request$4.run(Request.java:1240) 03-16 17:59:18.204: E/AndroidRuntime(1189): at android.os.Handler.handleCallback(Handler.java:615) 03-16 17:59:18.204: E/AndroidRuntime(1189): at android.os.Handler.dispatchMessage(Handler.java:92) 03-16 17:59:18.204: E/AndroidRuntime(1189): at android.os.Looper.loop(Looper.java:137) 03-16 17:59:18.204: E/AndroidRuntime(1189): at android.app.ActivityThread.main(ActivityThread.java:4745) 03-16 17:59:18.204: E/AndroidRuntime(1189): at java.lang.reflect.Method.invokeNative(Native Method) 03-16 17:59:18.204: E/AndroidRuntime(1189): at java.lang.reflect.Method.invoke(Method.java:511) 03-16 17:59:18.204: E/AndroidRuntime(1189): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 03-16 17:59:18.204: E/AndroidRuntime(1189): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 03-16 17:59:18.204: E/AndroidRuntime(1189): at dalvik.system.NativeStart.main(Native Method) 03-16 17:59:18.354: D/dalvikvm(1189): GC_CONCURRENT freed 423K, 6% free 8428K/8903K, paused 107ms+76ms, total 316ms </code></pre>
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    1. COWhich userInfo.append? I'd say user.getProperty("locale") here might return null for some reason. I haven't tried it though. I was just having a quick glance at this question :)
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      1. POAndroid Facebook API - StringBuilder returns NULL
      1. USAndrea Richiardi
    2. COAdd here your logcat.
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      1. POAndroid Facebook API - StringBuilder returns NULL
      1. USSimon Dorociak
    3. CO@Sajmon - Added logcat
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      1. USjwBurnside
 

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