Preference cannot cast java.lang.boolean to String

android, java, sharedpreferences

Solution

It obviously that some prefs are checked and only return boolean value. So you cannot use this directly.

for (Entry<String, ?> key : appPrefs.getAll().entrySet()) {
    findPreference(key.getKey()).setSummary(appPrefs.getString(key.getKey(), "Not yet entered"));
}

I think maybe you should use like that:

for (Entry<String, ?> key : appPrefs.getAll().entrySet()) {
    Object result = key.getValue();
    if (result instanceof Boolean) {
        //handle boolean
    } else if (result instanceof String) {
        //handle String
    }
    findPreference(key.getKey()).setSummary(result);
}

Problem

I have the following Preference class: ``` public class AppPreferencesActivity extends PreferenceActivity { private SharedPreferences appPrefs; private SharedPreferences.Editor prefEditor; private Mediator mediator; private SharedPreferences.OnSharedPreferenceChangeListener listener; private User user; @SuppressWarnings("deprecation") public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //---load the preferences from an XML file--- addPreferencesFromResource(R.xml.preferences); this.appPrefs = PreferenceManager.getDefaultSharedPreferences(this); this.mediator = (Mediator) getApplication(); this.prefEditor = appPrefs.edit(); this.user = mediator.getUser(); setPreferences(); listener = new SharedPreferences.OnSharedPreferenceChangeListener() { public void onSharedPreferenceChanged(SharedPreferences prefs, String key) { // Implementation updatePreference(key); Toast.makeText(AppPreferencesActivity.this, "Information updated", Toast.LENGTH_SHORT).show(); } }; appPrefs.registerOnSharedPreferenceChangeListener(listener); } private void setPreferences(){ prefEditor.putString("nameEdit", user.getName() + " "+user.getLastName()); prefEditor.putString("streetEdit", user.getStreetName()); prefEditor.putString("streetNumberEdit", ""+user.getStreetNr()); prefEditor.putString("emailEdit", user.getEmail()); prefEditor.commit(); preferenceAddSummary(); } public boolean checkEmailStatus(){ return appPrefs.contains("emailEdit"); } @SuppressWarnings("deprecation") private void preferenceAddSummary() { for (Entry<String, ?> key : appPrefs.getAll().entrySet()) { findPreference(key.getKey()).setSummary(appPrefs.getString(key.getKey(), "Not yet entered")); // this is where im getting the error } ``` However when i run this i get the following Cannot cast Java.lang.boolean to Java.lang.String I get this error at the loop im calling to setSumary can anyone tell me why this is happening? UPDATE Full stackTrace in text: ``` 05-02 02:28:15.835: E/AndroidRuntime(1775): FATAL EXCEPTION: main 05-02 02:28:15.835: E/AndroidRuntime(1775): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.konkurrencesigner/com.example.konkurrencesigner.AppPreferencesActivity}: java.lang.ClassCastException: java.lang.Boolean cannot be cast to java.lang.String 05-02 02:28:15.835: E/AndroidRuntime(1775): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 05-02 02:28:15.835: E/AndroidRuntime(1775): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 05-02 02:28:15.835: E/AndroidRuntime(1775): at android.app.ActivityThread.access$600(ActivityThread.java:141) 05-02 02:28:15.835: E/AndroidRuntime(1775): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 05-02 02:28:15.835: E/AndroidRuntime(1775): at android.os.Handler.dispatchMessage(Handler.java:99) 05-02 02:28:15.835: E/AndroidRuntime(1775): at android.os.Looper.loop(Looper.java:137) 05-02 02:28:15.835: E/AndroidRuntime(1775): at android.app.ActivityThread.main(ActivityThread.java:5039) 05-02 02:28:15.835: E/AndroidRuntime(1775): at java.lang.reflect.Method.invokeNative(Native Method) 05-02 02:28:15.835: E/AndroidRuntime(1775): at java.lang.reflect.Method.invoke(Method.java:511) 05-02 02:28:15.835: E/AndroidRuntime(1775): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 05-02 02:28:15.835: E/AndroidRuntime(1775): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 05-02 02:28:15.835: E/AndroidRuntime(1775): at dalvik.system.NativeStart.main(Native Method) 05-02 02:28:15.835: E/AndroidRuntime(1775): Caused by: java.lang.ClassCastException: java.lang.Boolean cannot be cast to java.lang.String 05-02 02:28:15.835: E/AndroidRuntime(1775): at android.app.SharedPreferencesImpl.getString(SharedPreferencesImpl.java:224) 05-02 02:28:15.835: E/AndroidRuntime(1775): at com.example.konkurrencesigner.AppPreferencesActivity.preferenceAddSummary(AppPreferencesActivity.java:55) 05-02 02:28:15.835: E/AndroidRuntime(1775): at com.example.konkurrencesigner.AppPreferencesActivity.setPreferences(AppPreferencesActivity.java:47) 05-02 02:28:15.835: E/AndroidRuntime(1775): at com.example.konkurrencesigner.AppPreferencesActivity.onCreate(AppPreferencesActivity.java:28) 05-02 02:28:15.835: E/AndroidRuntime(1775): at android.app.Activity.performCreate(Activity.java:5104) 05-02 02:28:15.835: E/AndroidRuntime(1775): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 05-02 02:28:15.835: E/AndroidRuntime(1775): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 05-02 02:28:15.835: E/AndroidRuntime(1775): ... 11 more ```

Original source