Geek Answers Handbook

Java.lang.NullPointerException: attempt to call the virtual method 'java.io.File com.parse.ParsePlugins.getParseDir ()' to reference a null object

Trying to load a class from Parse , however the application will work as soon as I run it! Here is the code:

  ListView listview; List<ParseObject> ob; ProgressDialog mProgressDialog; ArrayAdapter<String> adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_big_board); new RemoteDataTask().execute(); } private class RemoteDataTask extends AsyncTask<Void, Void, Void> { @Override protected void onPreExecute() { super.onPreExecute(); mProgressDialog = new ProgressDialog(BigBoard.this); mProgressDialog.setTitle("Parse.com Simple ListView Tutorial"); mProgressDialog.setMessage("Loading..."); mProgressDialog.setIndeterminate(false); mProgressDialog.show(); } @Override protected Void doInBackground(Void... params) { // Locate the class table named "Country" in Parse.com ParseQuery<ParseObject> query = new ParseQuery<ParseObject>( "Country"); query.orderByDescending("_created_at"); try { ob = query.find(); } catch (ParseException e) { Log.e("Error", e.getMessage()); e.printStackTrace(); } return null; } @Override protected void onPostExecute(Void result) { // Locate the listview in listview_main.xml listview = (ListView) findViewById(R.id.listview); // Pass the results into an ArrayAdapter adapter = new ArrayAdapter<String>(BigBoard.this, R.layout.listview_item); // Retrieve object "name" from Parse.com database for (ParseObject country : ob) { adapter.add((String) country.get("Name")); } // Binds the Adapter to the ListView listview.setAdapter(adapter); // Close the progressdialog mProgressDialog.dismiss(); // Capture button clicks on ListView items listview.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // Send single item click data to SingleItemView Class Intent i = new Intent(BigBoard.this, SingleItemView.class); // Pass data "name" followed by the position i.putExtra("name", ob.get(position).getString("name") .toString()); // Open SingleItemView.java Activity startActivity(i); } }); } }

And this is what I get in logcat:

 > 10-22 20:40:18.705 12588-12872/obx.com.futurister E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #3 Process: obx.com.futurister, PID: 12588 java.lang.RuntimeException: An error occurred while executing doInBackground() at android.os.AsyncTask$3.done(AsyncTask.java:309) at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354) at java.util.concurrent.FutureTask.setException(FutureTask.java:223) at java.util.concurrent.FutureTask.run(FutureTask.java:242) at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) at java.lang.Thread.run(Thread.java:818) Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.io.File com.parse.ParsePlugins.getParseDir()' on a null object reference at com.parse.Parse.getParseDir(Parse.java:315) at com.parse.ParseCorePlugins.getCurrentUserController(ParseCorePlugins.java:129) at com.parse.ParseUser.getCurrentUserController(ParseUser.java:55) at com.parse.ParseUser.getCurrentUserAsync(ParseUser.java:888) at com.parse.ParseQuery.getUserAsync(ParseQuery.java:938) at com.parse.ParseQuery$3.call(ParseQuery.java:1196) at com.parse.ParseQuery$3.call(ParseQuery.java:1193) at com.parse.ParseQuery.doWithRunningCheck(ParseQuery.java:1132) at com.parse.ParseQuery.findAsync(ParseQuery.java:1193) at com.parse.ParseQuery.findInBackground(ParseQuery.java:1161) at com.parse.ParseQuery.find(ParseQuery.java:981) at obx.com.futurister.BigBoard$RemoteDataTask.doInBackground(BigBoard.java:66) at obx.com.futurister.BigBoard$RemoteDataTask.doInBackground(BigBoard.java:44) at android.os.AsyncTask$2.call(AsyncTask.java:295) at java.util.concurrent.FutureTask.run(FutureTask.java:237)            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)            at java.lang.Thread.run(Thread.java:818) 10-22 20:40:18.857 12588-12619/obx.com.futurister E/Surface﹕ getSlotFromBufferLocked: unknown buffer: 0xb3a1fb90 10-22 20:40:18.955 12588-12619/obx.com.futurister E/Surface﹕ getSlotFromBufferLocked: unknown buffer: 0xa96acbb0 10-22 20:40:18.996 12588-12588/obx.com.futurister E/WindowManager﹕ android.view.WindowLeaked: Activity obx.com.futurister.BigBoard has leaked window com.android.internal.policy.PhoneWindow$DecorView{a0f50b2 VE..... R......D 0,0-1026,538} that was originally added here at android.view.ViewRootImpl.<init>(ViewRootImpl.java:368) at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:299) at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:85) at android.app.Dialog.show(Dialog.java:319) at obx.com.futurister.BigBoard$RemoteDataTask.onPreExecute(BigBoard.java:56) at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:604) at android.os.AsyncTask.execute(AsyncTask.java:551) at obx.com.futurister.BigBoard.onCreate(BigBoard.java:40) at android.app.Activity.performCreate(Activity.java:6237) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) at android.app.ActivityThread.-wrap11(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Guess the problem with the doInBackground() method? Am I missing something? Please help thanks

+6
source share
1 answer

Based on your comment, I assume that you did not initialize Parse. http://docs.parseplatform.org/android/guide/#local-datastore

  public class App extends Application { @Override public void onCreate() { super.onCreate(); // Enable Local Datastore. Parse.enableLocalDatastore(this); // Register any ParseObject subclass. Must be done before calling Parse.initialize() ParseObject.registerSubclass(YourClass.class); Parse.initialize(this, "APPLICATION_ID", "CLIENT_KEY"); } }

Make sure you add the App class to the manifest

+11
source

More articles:


All Articles