Singleton with an init method taking an Android Application object

new_gist_file

public class MySingleton {

    static final Object mLock = new Object();

    static MySingleton mInstance;

    private Context mContext;

    // Private constructor prevents instantiation from other classes
    private MySingleton() { }

    static MySingleton getInstance() {
        synchronized (mLock) {
            if (mInstance == null) {
                mInstance = new MySingleton();
            }
        }
        return mInstance;
    }

    public void init(Application app) {
        if (mContext == null) mContext = app;
    }

}