Question

Sorry, this might be quite a lengthy question, but how do i actually save int/byte/string data types in Android?

I do know that to save a String into the internal memory (note, not external or anything else), i have to do something like this:

String FILENAME = "hello_file";

String string = "hello world!";

FileOutputStream fos = openFileOutput(FILENAME, Context.MODE_PRIVATE);

fos.write(string.getBytes());

fos.close();

to save the file, and:

int saveTest = fos.read();

fos.close();

to read the file from another activity or something. (Is this correct?)

But what if i want to save and read the file as an int/byte data file? Is this possible? And how would i be able to do it?

Answer 1

To save your objects you can use the ObjectOutput class to serialize them, e.g.:

// Example object which implements Serializable 
Example example = new Example();

// Save an object 
ObjectOutput out = new ObjectOutputStream(new FileOutputStream(new File(getCacheDir(),"")+"cacheFile.srl"));
out.writeObject( new Integer( YOUR_INT ) );
out.close();


// Load in an object
ObjectInputStream in = new ObjectInputStream(new FileInputStream(new File(new File(getCacheDir(),"")+"cacheFile.srl")));
Integer example_loaded = (Integer) in.readObject();
in.close();

Where the class Example could be any object that implements serializable or byte data, the javadocs may also help!

Hope this helps!