Weird exception: Cannot cast String to Boolean when using getBoolean

Question

I\'m getting a very weird error. I have 2 activities. On both I\'m getting the SharedPreferences using MODE_PRIVATE (if it matters) by sp = g

Answer 1

I am assuming that

sp.getBoolean(IntroActivity.SHOW_INTRO, true)// this line returns a String value.

so you can do like this

boolean showIntro = Boolean.parseBoolean(sp.getBoolean(IntroActivity.SHOW_INTRO, true));

Answer 2

Got this exception when, by mistake, I've given to two preferences the same key in the XML file android:key="your_key"!

So double checking your settings.xml may help.

Answer 3

The exception occurs in this Android method:

public boolean getBoolean(String key, boolean defValue) {
    synchronized (this) {
        awaitLoadedLocked();
        Boolean v = (Boolean)mMap.get(key); // On this line
        return v != null ? v : defValue;
    }
}

The only sense I can make of this error is that your are reusing the key IntroActivity.SHOW_INTRO for a String somewhere else in your code.

Answer 4

The line sp.getBoolean(IntroActivity.SHOW_INTRO, true)// this line returns a String value.

so you have to do as given below,

String flag=sp.getBoolean(IntroActivity.SHOW_INTRO, true);

if(flag.equalsIgnoreCase("true")){
    boolean showIntro = true;   
}else{
    boolean showIntro = false;
}

Try this it will definitely works.

Answer 5

If there's ever been a string with that key, even if by accident, it will stay there until you clear the app's data or uninstall. Try uninstalling it to see if it still occurs.

Answer 6

Use the below code to set the boolean value in SharedPreference:

    SharedPreferences appSharedPrefs = PreferenceManager
            .getDefaultSharedPreferences(this.getApplicationContext());
    Editor prefsEditor = appSharedPrefs.edit();
    prefsEditor.putBoolean(IntroActivity.SHOW_INTRO, true);
    prefsEditor.commit();

And to retrieve the boolean value from SharedPreference use this code:

SharedPreferences appSharedPrefs = PreferenceManager
            .getDefaultSharedPreferences(this.getApplicationContext());
    boolean showIntro = appSharedPrefs.getBoolean(IntroActivity.SHOW_INTRO, true);