Android Preferences error, "String cannot be cast to int"

Question

I'm trying to setup a preferences activity but my app keeps crashing and I get the following logcat:

FATAL EXCEPTION: main java.lang.RuntimeException: Unable to start activity ComponentInfo{com.appthing.myapp/com.appthing.myapp.Main}: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer

Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer 07-24 16:37:59.556: E/AndroidRuntime(17384): at android.app.SharedPreferencesImpl.getInt(SharedPreferencesImpl.java:240)

In my Main activity I have the following code inside the onResume() method:

    SeekBar tipSeekBar = (SeekBar) findViewById(R.id.tipSeekBar);
    SeekBar splitSeekBar = (SeekBar) findViewById(R.id.splitSeekBar);

    SharedPreferences preferences = PreferenceManager
            .getDefaultSharedPreferences(this);

    tipSeekBar.setProgress(preferences.getInt("defaultTip", 15));
    splitSeekBar.setProgress(preferences.getInt("defaultSplit", 1));
    tipSeekBar.setMax(preferences.getInt("maxTip", 25));
    splitSeekBar.setMax(preferences.getInt("maxSplit", 10));

Here is what I have in the Preference class (as requested):

addPreferencesFromResource(R.layout.preferences);
// I was told in tutorials this is all I need in the oncreate method

I don't understand why its saying something about a string. All my values are integers and I am using android:inputType="number" to make sure only an int can be entered. I have also tried uninstalling and re-installing the app to clear the cache and nothing works.

RESOLVED:

"Your Preferences in XML, even if you set android:inputType="number" are still stored as a String" (by Waza_Be). All I had to do is do Integer.parseInt() to grab the correct value.

Can you see the stack trace at what line of calling getInt it is failing? Is it tipSeekBar or splitSeekBar Etc. — Phani, Jul 24 '13 at 20:49

score 25 · Accepted Answer · edited May 23 '17 at 12:24

25

Your Preferences in XML, even if you set android:inputType="number" are still stored as a String

You have 2 choices:

1) the 'not-so-nice': Integer.parseInt( preferences.getString("defaultTip", "15"));

2) Using your own type of Integer Preference. More complicated to set in first place but really better (similar question here: https://stackoverflow.com/a/3755608/327402)

edited May 23 '17 at 12:24

Community

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answered Jul 24 '13 at 21:04

Waza_Be

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"Your Preferences in XML, even if you set android:inputType="number" are still stored as a String" thats the key, I never knew this! Thank you! – Jul 24 '13 at 21:14
Glad that I could help. – Waza_Be Jul 24 '13 at 21:34
1

Well, that's quite silly. Especially when your ListPreferences are referencing an , it still treats them as Strings. Thanks for the tip. – phreakhead Nov 07 '15 at 02:23
I set string value "" in shared preference for integer object, so when i get value from preference i am getting this issue, so please make sure you set value into preference is integer only. – varotariya vajsi Dec 06 '17 at 14:01
1

ok, so this is the second time I have run into this, years apart, and I still have to ask - what is the *point* of `preferences.getInt` if it's just going to throw an exception?! – Michael Aug 11 '19 at 19:37

Levon Petrosyan · Answer 2 · 2019-03-22T17:25:10.167

1

The exception can also be thrown if

you are using the same key for storing two or more different types of values
at first you stored the value as String and then changed storing and retrieving implementation for int value. For this case just clear the cache.

edited Mar 22 '19 at 17:25

answered May 12 '18 at 13:54

Levon Petrosyan

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score -1 · Answer 3 · answered Jul 24 '13 at 20:58

-1

If you are storing the preferences with the right data types, then it should not be problem. Please look at the JavaDoc here.

answered Jul 24 '13 at 20:58

Phani

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Android Preferences error, "String cannot be cast to int"

RESOLVED:

3 Answers3