java - NullPointer Exception when getting array size on some devices -

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i nullpointer exception when getting size of array. nullpointer exception on device.

i have class called exercisestartactivity. here call randomize method.

public class exercisestartactivity extends activity{          private exercise currentexercise;        private fitnessexercise myexercises;      private int exercisenbr;      private int maxexercises;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);      //..     ....     ....     //      initexercise(); }     private void initexercise() {     exercisenbr = 0;     exercise[] exercises = loadexercises(savingdata.getdifficulty());     myexercises = new fitnessexercise(exercises);     myexercises.randomize();     maxexercises = myexercises.nbrofexercises();     nextexercise(); }  private exercise[] loadexercises(int difficulty) {     exercise[] exercise = null;     switch(difficulty){     case r.id.radio_easy:         exercise = difficultyeasy();         break;     case r.id.radio_medium:         exercise = difficultymedium();         break;     case r.id.radio_hard:         exercise = difficultyhard();         break;     }     return exercise; }  private exercise[] difficultyhard() {     exercise[] exercises = {new exercise("push-ups", "pushup", 40),             new exercise("leg-up crunches", "crunch_leg_up", 90),             new exercise("crunches", "crunch", 90),             new exercise("bicycle crunches", "crunch_cycle", 100),             new exercise("jumping jacks", "jumpingjack", 100),             new exercise("squats", "squats", 30),             new exercise("high knees", "highknees", 120),             new exercise("lunges", "lunge", 30),             new exercise("bench dips", "bench_dips", 40),             new exercise("knee push-ups", "kneepushups", 80)             };     return exercises; }   }

i have fitnessexercise class randomize class: in class null pointer exception when randomize() method called.

public class fitnessexercise {  private exercise[] exercises; // array  questions      private int index = -1; // index of question      private random random = new random();      public fitnessexercise(exercise[] exercises){         this.exercises = exercises;      }       public void randomize()     {          int swappos;          exercise message;          (int = exercises.length - 1; > 0; i--)          {              swappos = random.nextint(i + 1);              message = exercises[i];              exercises[i] = exercises[swappos];              exercises[swappos] = message;          }      }   }

here errors:

java.lang.runtimeexception: unable start activity > componentinfo{com.playsimple.fitnessapp/com.playsimple.fitnessapp.exercisestartactivity}: > java.lang.nullpointerexception @ > android.app.activitythread.performlaunchactivity(activitythread.java:2184) > @ > android.app.activitythread.handlelaunchactivity(activitythread.java:2233) > @ android.app.activitythread.access$800(activitythread.java:135) @ > android.app.activitythread$h.handlemessage(activitythread.java:1196) > @ android.os.handler.dispatchmessage(handler.java:102) @ > android.os.looper.loop(looper.java:136) @ > android.app.activitythread.main(activitythread.java:5001) @ > java.lang.reflect.method.invokenative(native method) @ > java.lang.reflect.method.invoke(method.java:515) @ > com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:785) > @ com.android.internal.os.zygoteinit.main(zygoteinit.java:601) @ > dalvik.system.nativestart.main(native method) caused by: > java.lang.nullpointerexception @ > com.playsimple.fitnessapp.fitnessexercise.randomize(fitnessexercise.java:34) > @ > com.playsimple.fitnessapp.exercisestartactivity.initexercise(exercisestartactivity.java:74) > @ > com.playsimple.fitnessapp.exercisestartactivity.oncreate(exercisestartactivity.java:67) > @ android.app.activity.performcreate(activity.java:5231) @ > android.app.instrumentation.callactivityoncreate(instrumentation.java:1087) > @ > android.app.activitythread.performlaunchactivity(activitythread.java:2148) > ... 11 more

after loading exercises null.

exercise[] exercises = loadexercises(savingdata.getdifficulty()); if (exercises == null) {     // no exercises loaded     // maybe create default exercises here?  } else {     myexercises = new fitnessexercise(exercises);     myexercises.randomize();     maxexercises = myexercises.nbrofexercises();     nextexercise(); }

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