CODEWITHSUNDEEP
androidsharedpreferences
Iiro Krankka
Iiro Krankka

Reputation: 5239

SharedPreferences getFloat returns ClassCastException and force closes

I want to get a float from the preferences. This works fine when the user doesn't enter anything, but when entering 8.23 to the box and saving it, the app crashes on the next start.

MainActivity.java:

float hourly_rate;
SharedPreferences userdata;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    userdata = PreferenceManager.getDefaultSharedPreferences(this);
    hourly_rate = userdata.getFloat("hourly_rate", 0.0f);
}

Preferences.xml:

<PreferenceCategory
    android:title="@string/general_preferences_title">
    <EditTextPreference
        android:inputType="numberDecimal"
        android:key="hourly_rate"
        android:title="@string/hourly_rate_title"
        android:summary="@string/hourly_rate_summary" />
</PreferenceCategory>

When I remove the getFloat line, the app doesn't force close.

Upvotes: 3

Views: 3696

Answers (2)

Franziskus Karsunke
Franziskus Karsunke

Reputation: 5208

This question is maybe the same: How does one declare the type of an Android preference?. It might solve your problem.

Upvotes: 2

harism
harism

Reputation: 6073

EditTextPreference stores its content as a String. Float.parseFloat(String) might be good use for you - among with preferences.getString(..) - unless you write an own FloatPreference which stores text input as a float.

Upvotes: 5

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