Question

I have created a class for working with SharedPreferences. In my Activity, I am trying to add an item and get the following error…

06-05 17:01:53.950: E/AndroidRuntime(3488): FATAL EXCEPTION: main
06-05 17:01:53.950: E/AndroidRuntime(3488): java.lang.NullPointerException
06-05 17:01:53.950: E/AndroidRuntime(3488):     at com.xcxcxc.helpers.Prefs.init(Prefs.java:16)
06-05 17:01:53.950: E/AndroidRuntime(3488):     at com.xcxcxc.helpers.Prefs.addStringProperty(Prefs.java:30)
06-05 17:01:53.950: E/AndroidRuntime(3488):     at com.xcxcxc.usersadapter.SplashActivity$1.callback(SplashActivity.java:78)
06-05 17:01:53.950: E/AndroidRuntime(3488):     at com.xcxcxc.usersadapter.SplashActivity$1.callback(SplashActivity.java:1)

This is my code for handling the SharedPreferences…

import android.content.Context;
import android.content.SharedPreferences;

public class Prefs {

    public static final String STORAGE_NAME = "ApplicationPrefs";

    private static SharedPreferences settings = null;
    private static SharedPreferences.Editor editor = null;
    private static Context context = null;

    public static void init(Context cntxt) {
        context = cntxt;
    }

    private static void init() {
        settings = context.getSharedPreferences(STORAGE_NAME, 0);
        editor = settings.edit();
    }

    /* String values */
    public static void addStringProperty(String name, String value) {
        if (settings == null || editor == null) {
            init();
        }
        editor.putString(name, value);
        editor.commit();
    }

    public static String getStringProperty(String name) {
        if (settings == null || editor == null) {
            init();
        }
        return settings.getString(name, null);
    }
}

This is the code I am calling in my Activity…

Prefs.addStringProperty("client_id", "1JDkv9sdfj8sf63rjs");

Answer 1

Looks like the Context is null. Set the Context before addStringProperty(..)

Prefs.init(getApplicationContext());
Prefs.addStringProperty("client_id", "1JDkv9sdfj8sf63rjs");