Android NotSerializableException raises for an object

Question

In my android application I use a file to store license data. And I uses Serialize objects. I create a Device object and read the file details in to the object. Device class implements Serializable.

public class MyDevice implements Serializable {}

But at the start of application it deserialize and store in a MyDevice object. My deserializeObject method is as below.

public MyDevice deserializeObject() {

    File SerialFile = new File(GeoTrackerPaths.FILE_PATH);
    MyDevice AndDeviceIn = new MyDevice();

    if (SerialFile.exists()) {
        try {
            FileInputStream fileIn = new FileInputStream(GeoTrackerPaths.FILE_PATH);
            ObjectInputStream objInput = new ObjectInputStream(fileIn);
            AndDeviceIn = (MyDevice) objInput.readObject();
            objInput.close();
            fileIn.close();

        } catch (Exception e) {

            Log.i("TAG", "Exception during deserialization:" + e.getMessage());
            e.printStackTrace();
            System.exit(0);
        }
    }

    return AndDeviceIn;
}

My serialization code

public void serializeObject(Context context, String phoneModel,
        String androidVersion, String executiveCode, String Key,
        String modelID, String tempKey, int noLogin, String expireDate, String Status) {

    try {
        MyDevice AndDeviceOut = new MyDevice(context, phoneModel,
                androidVersion, new Date(), executiveCode, Key, modelID,
                tempKey, noLogin, expireDate, Status);

        FileOutputStream fileOut = new FileOutputStream(
                GeoTrackerPaths.FILE_PATH);
        ObjectOutputStream objOutput = new ObjectOutputStream(fileOut);
        objOutput.writeObject(AndDeviceOut);
        objOutput.flush();
        objOutput.close();
        fileOut.close();

    } catch (Exception e) {
        Log.i("TAG", "Exception during serialization:" + e.getMessage());
        e.printStackTrace();
        System.exit(0);
    }
}

And I'm calling it as below.

DeviceActivator activate=new DeviceActivator();
activate.serializeObject(Activation.this, phoneModel, androidVersion, txtExe, exeKey, modeilID, tempKey, noLogin, expireDate, Activation_Status);

when I'm running the app following exceptions are raised.

java.io.WriteAbortedException: Read an exception; 
java.io.NotSerializableException: com.geotracker.entity.MyDevice

How can I fix this?

Answer 1

It doesn't look like the Android Context object is serializable. You can solve this by declaring the Context object as transient, which you can read about in here in the JDK spec: Link. Basically marking a field as transient means it won't participate in Serialization

So declare your field like this in MyDevice :

private transient Context context;

and you should be good to go!