Java Serializer

In Computer Science, serialisation is a process of translating data structures or objects into a byte stream that can be stored (in a file or memory buffer), or can be transmitted across a network link, and the byte stream can be re-read and re-constructed into the same clone.  Serialisation is a way to prevent the byte ordering (endianness), memory layout problem.

In Java, the java.io.serializable implement the serialisation. You can write a Java class to implement the Serializable interface.

class IsSerializable implements Serializable  

{  

    private String plug = "Plugin to Java!";  

    public IsSerializable()  

    {  

        try  

        {  

            FileOutputStream out = new FileOutputStream("/mnt/sdcard/yes-out.txt");  

            ObjectOutputStream oos = new ObjectOutputStream(out);  

            oos.writeObject(this);  

        }  

        catch (Exception e)  

        {  

            e.printStackTrace();  

        }  

    }  

}  

@Override

protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        IsSerializable is = new IsSerializable();  

        ...

}

If you run this code, there is an error message:

java.io.NotSerializableException: com.example.xxxxx.MainActivity.

The reason is that you can't get the whole class to be serialised.

Solution:
If we replace oos.writeObject(this); with oos.writeObject(plug);  the problem is fixed.