write/save an array of custom objects android java

Question

I have been using this code:

                 public void saveCredits(int myInt) {
         try {
            OutputStream fos = openFileOutput("test.txt", Context.MODE_PRIVATE);
            DataOutputStream dis = new DataOutputStream(fos);
            dis.writeInt(myInt);
            fos.flush();
            fos.close();
         }
         catch (IOException e) {
             System.out.println(e); 
         }
      }

How do I modify it in the simplest way to also write an array of custom objects such as houses(String name, int cost, Address address)

Do you also have code that reads it in? Why not use serialization? It's a little more to learn but you will save in the long run java.sun.com/developer/technicalArticles/Programming/… — weston
– weston, Commented Mar 29, 2012 at 11:40

myself · Accepted Answer · 2012-03-29 12:22:24Z

1

Easiest way with DataOutputStream is to:

store array size
then items themselves

Like this:

DataOutputStream out = ... ;
out.writeInt(items.length);
for (Item item : items) {
    out.writeUTF(item.someString());
    out.writeFloat(item.someFloat());
}

Loading such an array is easy too:

DataInputStream in = ... ;
int length = in.readInt();
Item[] items = new Item[length];
for (int i = 0; i < length; ++i) {
    items.add(new Item(in.readUTF(), in.readFloat()));
}

answered Mar 29, 2012 at 12:22

myself

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Comments

ngesh · Accepted Answer · 2012-03-29 11:39:41Z

0

Use ObjectOutPutStream and method writeObject().. Preciseley you need to Serialize and Deserialize your Objects.. more here

answered Mar 29, 2012 at 11:39

ngesh

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