Question

I am writing a object to a file in a separate thread and this thread executes in every one minute. Every thing is work fine but if system crashes(remove power supply) then the file(in which I am writing the object) size become zero byte on next reboot.

My Code is:

FileOutputStream fileOut = new FileOutputStream("/sdcard/vis.ser");
ObjectOutputStream out = new ObjectOutputStream(fileOut);
out.writeObject(/*An object*/);    
out.close();

Answer 1

The idea is to use a checksum to ensure the file has been written correctly and use renaming as Whity suggests.

However, if you are saving a primitive type, then you can use SharedPreferences, which will avoid your “0 bytes” problem.

This question will give you a broader idea about how to prevent it.