nullpointerexception

问题 So I am confused and I don't know how to fix the error crashlytics and google playstore keep saying my users are having. Here is my code: if (event.getEventType() == AccessibilityEvent.TYPE_NOTIFICATION_STATE_CHANGED) { Notification notification = (Notification) event.getParcelableData(); String text = ""; if (notification.extras.getString(Notification.EXTRA_TEXT) != null){ text = notification.extras.getString(Notification.EXTRA_TEXT); } if (text != null) { if (text.equals("You have been idle

问题 As the topic says I have created a chess game as my first 2D game, but when ever I try to create a runnable jar file from it I get a strange behavior, and when I move the pieces the game becomes chaotic and nothing works. The weird thing is that inside the eclipse everything works perfectly. When it creates the runnable jar file eclipse gives the following error: Resource is out of sync with the file system: '/Chess_Project/src/.DS_Store'. I don't remember even having such file in my project

问题 Today I wrote a small Java program to find files on my harddisk, partly because Windows lacks a proper one and partly because it was for fun. It simply iterates over all childs of a directory and recursively through all their children if they are directories. But then I had a NullPointerException . After some System.out.println()'s and a try-catch block I found out this happened on some directories like D:\System Volume Information , C:\Users\Public\Documents\My Videos and C:\ProgramData

问题 I do everything according to great guides from Youtube. https://www.youtube.com/watch?v=W-L6Cr2WP18 - I recommend. Unfortunately, instead of activity, I use a fragment and I have an error. MainActivity: public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener{ private String userEmail, userName; private GoogleApiClient googleApiClient; private FirebaseAuth firebaseAuth; private FirebaseFirestore rootRef; private FirebaseAuth

问题 I am trying to start a project ( java + groovy on gradle ) after accomplished build. However, I ran into error on start of both main or unit test with following stack trace: Error:Internal error: (java.lang.NullPointerException) null java.lang.NullPointerException at org.jetbrains.jps.model.serialization.JpsProjectLoader.loadFromDirectory(JpsProjectLoader.java:156) at org.jetbrains.jps.model.serialization.JpsProjectLoader.loadProject(JpsProjectLoader.java:96) at org.jetbrains.jps.model

问题 Hi guys I´ve tried to connect two different interfaces on my app with the following code public class HelloForms extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); final ImageButton button = (ImageButton) findViewById(R.id.android_button); button.setOnClickListener(new OnClickListener() { public void onClick(View v) { //Perform action on clicks

问题 I got problem with my javaFx application. Everytime I call the .setText() method of my Label, I get a NullPointerException. Here is my code: This is a snnippet of my Controller: public class HomenizerController implements Initializable{ //ArrayList zum abspeichern der Termine in Listen Form private ArrayList<Date> dateList = new ArrayList(); //ArrayList zum ab speichern der Aufgaben in Listen Form private ArrayList<ToDo> toDoList = new ArrayList(); private Properties prop = null; @FXML

问题 Setting OnTouchListener to the Relative layout giving me NullPointerException .I don't know why. Here is the code: holder.alert_message.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View view, MotionEvent motionEvent) { ((GroupChatActivity) context).expandAlertRow( position,holder.alert_message,holder.WholeView); holder.arrowAlertButton.setRotation(360); return false; } }); code walks through return statement after that it crashes and give

问题 about 10 days ago, my app started to record this exception (seen on dev console): java.lang.NullPointerException: at org.chromium.android_webview.AwContents$AwViewMethodsImpl.onDragEvent (AwContents.java:191) at com.android.webview.chromium.WebViewChromium.onDragEvent (WebViewChromium.java:782) at android.webkit.WebView.onDragEvent (WebView.java:2554) at android.view.View.dispatchDragEvent (View.java:22202) at android.view.ViewGroup.dispatchDragEvent (ViewGroup.java:1431) at android.view

问题 This is very odd. I have a simple app which once logged in shows a fragment in an activity. The app also has an inactivity "timeout" after which time it finishes the activity and shows the login screen -- if the app is in the background when the timeout occurs then when the next onCreate or onStart event occurs in the activity it is finished. However sometimes when returning to the logged in activity I get a NPE in the onActivityCreated method of my fragment. The fragment is very simple and