Reich null Objektverweis

Question

, wenn ich meine app mit out-Netzwerk starten und meine Daten in meiner Datenbank app Absturz nennen und dies ist mein Code

public void getAllMovies() { 
    findData = realm.where(MovieDb.class).findAll(); 
    movieArrayList = new ArrayList(findData); 
    movieMethod(); 
} 

und ich meine Feuersbrunst machen hier in

public class myApplication extends Application { 

@Override 
public void onCreate() { 
    super.onCreate(); 
    RealmConfiguration configuration = new RealmConfiguration 
      .Builder(this).name("Movie_database.realm").build(); 
    Realm.setDefaultConfiguration(configuration);}} 

und MovieDB ist mein Reich
meine app Absturz in Zeile Objekt

findData = realm.where(MovieDb.class).findAll(); 

und das ist mein Fehler

E/AndroidRuntime: FATAL EXCEPTION: main 
       Process: com.massive.movieapp, PID: 4222 
       java.lang.RuntimeException: Unable to start activity ComponentInfo{com.massive.movieapp/com.massive.movieapp.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'io.realm.RealmQuery io.realm.Realm.where(java.lang.Class)' on a null object reference 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416) 
        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) 
       Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'io.realm.RealmQuery io.realm.Realm.where(java.lang.Class)' on a null object reference 
        at com.massive.movieapp.FragmentForActivity.getAllMovies(FragmentForActivity.java:143) 
        at com.massive.movieapp.FragmentForActivity.CallNetwork(FragmentForActivity.java:62) 
        at com.massive.movieapp.FragmentForActivity.onCreate(FragmentForActivity.java:55) 
        at android.app.Fragment.performCreate(Fragment.java:2198) 
        at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:942) 
        at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1148) 
        at android.app.BackStackRecord.run(BackStackRecord.java:793) 
        at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1535) 
        at android.app.FragmentController.execPendingActions(FragmentController.java:325) 
        at android.app.Activity.performStart(Activity.java:6252) 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2379) 
        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 

Answer 1

Die Ausnahme geschieht, weil Ihre realm Variable null ist, wenn Sie die getAllMovies Methode aufrufen.

Denken Sie daran, zuvor realm = Realm.getDefaultInstance(); anzurufen.