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    <p>This will not work because the <code>Object</code> class in Java is not serializable. See <a href="https://stackoverflow.com/questions/11600213/why-doesnt-java-lang-object-implement-the-serializable-interface">this question</a> for an explanation as to why.</p> <p>The <code>Intent.putExtra()</code> method requires a type that implements the serializable interface, Object does not implement this so consequently it will not work. I would suggest rather than having a <code>HashMap&lt;String,Object&gt;</code> you replace the Object with a more specific type that implements the Serializable interface. See this <a href="http://www.tutorialspoint.com/java/java_serialization.htm" rel="nofollow noreferrer">tutorial</a> for how to do this.</p> <p><strong>UPDATE</strong></p> <p>If the data you are passing is large there could be a fairly significant overhead associated with serializing and deserializing. Consequently it might be worth using a Static Singleton class to store the arraylist. The code sample below shows how you could implement this:</p> <pre><code>public class DataStore { private static final DataStore instance = new DataStore (); private arraylist = new ArrayList&lt;HashMap&lt;String,Object&gt;&gt;(); //Private constructor private DataStore () {} //Class is only accessible through this method public static Singleton getInstance() { return instance; } //Accessors for your data private ArrayList&lt;HashMap&lt;String,Object&gt;&gt; getArrayList() { return arraylist; } private void setArrayList(ArrayList&lt;HashMap&lt;String,Object&gt;&gt; value) { arraylist = value; } } </code></pre> <p>For reference here is a <a href="http://howtodoinjava.com/2012/10/22/singleton-design-pattern-in-java/" rel="nofollow noreferrer">tutorial</a> on static singletons.</p>
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    1. POPass the arraylist from one activity to another
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    1. CO+1 for you suggestion thanks but without using that i am getting the data..
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    2. COI agree, the singleton or a static field is the best way to store shared data in the same process. If your activities lives in different processes, then mesage passing is the only reasonable way and you need to marshall your data.
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