整数不能强制转换为 Long

Question

I am keeping track of row ids in the shared preferences for my sqlite database. I was using an int, but then I realized that maybe long would be more adequate for this since the id value could become huge over time. I am getting this error when I try to getLong from shared preference: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Long

sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
    editor = sharedPreferences.edit();
    workoutId = sharedPreferences.getLong("workoutId", 0);

My workoutId initialize code is a global variable private long workoutId; I'm not sure where it is getting integer value from in the error message. Or maybe int will suite just fine?

Answer 1

The problem is with your default value which is Integer.

You should use

workoutId = sharedPreferences.getLong("workoutId", 0L);

OR

workoutId = sharedPreferences.getLong("workoutId", (long) 0);