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POSingleton in Android
 

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    <p>I have followed this link and successfully made singleton class in Android. <a href="http://www.devahead.com/blog/2011/06/extending-the-android-application-class-and-dealing-with-singleton/">http://www.devahead.com/blog/2011/06/extending-the-android-application-class-and-dealing-with-singleton/</a></p> <p>Problem is that i want a single object. like i have Activity A and Activity B. In Activity A I access the object from Singleton <code>class</code>. I use the object and made some changes to it.</p> <p>When I move to Activity B and access the object from Singleton Class it gave me the initialized object and does not keep the changes which i have made in Activity A. Is there any other way to save the changing? Please help me Experts. This is <code>MainActivity</code></p> <pre><code>public class MainActivity extends Activity { protected MyApplication app; private OnClickListener btn2=new OnClickListener() { @Override public void onClick(View arg0) { Intent intent=new Intent(MainActivity.this,NextActivity.class); startActivity(intent); } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //Get the application instance app = (MyApplication)getApplication(); // Call a custom application method app.customAppMethod(); // Call a custom method in MySingleton Singleton.getInstance().customSingletonMethod(); Singleton.getInstance(); // Read the value of a variable in MySingleton String singletonVar = Singleton.customVar; Log.d("Test",singletonVar); singletonVar="World"; Log.d("Test",singletonVar); Button btn=(Button)findViewById(R.id.button1); btn.setOnClickListener(btn2); } </code></pre> <p>}</p> <p>This is <code>NextActivity</code></p> <pre><code>public class NextActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_next); String singletonVar = Singleton.customVar; Log.d("Test",singletonVar); }} </code></pre> <p><code>Singleton</code> Class</p> <pre><code>public class Singleton { private static Singleton instance; public static String customVar="Hello"; public static void initInstance() { if (instance == null) { // Create the instance instance = new Singleton(); } } public static Singleton getInstance() { // Return the instance return instance; } private Singleton() { // Constructor hidden because this is a singleton } public void customSingletonMethod() { // Custom method } } </code></pre> <p>and <code>MyApplication</code></p> <pre><code>public class MyApplication extends Application { @Override public void onCreate() { super.onCreate(); // Initialize the singletons so their instances // are bound to the application process. initSingletons(); } protected void initSingletons() { // Initialize the instance of MySingleton Singleton.initInstance(); } public void customAppMethod() { // Custom application method } } </code></pre> <p>When i run this code, i get Hello which i have initialized in <code>Singleton</code> then World which i gave it in <code>MainActivity</code> and again shows Hello in <code>NextActivity</code> in logcat. I want it to show world again in <code>NextActivity</code>. Please help me to correct this.</p>
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