Okay, here's how I implemented the resume game function:
In the onPause method I save the game state (Object) to a file:
private void SaveGame()
{
FileOutputStream fileOutputStream = null;
ObjectOutputStream objOutStream = null;
try
{
fileOutputStream = openFileOutput(PlayActivity.SAVE_FILE_NAME,
Context.MODE_PRIVATE);
objOutStream = new ObjectOutputStream(fileOutputStream);
objOutStream.writeObject((Deck)this.gameDeck);
objOutStream.close();
Log.v(this.getLocalClassName(), "writing file");
}
catch (Exception FileNotFoundException)
{
Log.v(this.getLocalClassName(), "File not found exception!:" +
PlayActivity.SAVE_FILE_NAME);
}
}
In the onCreate() method I restore the game state from the file:
try
{
fileInputStream = openFileInput(PlayActivity.SAVE_FILE_NAME);//
this.openFileInput(PlayActivity.SAVE_FILE_NAME);
objInStream = new ObjectInputStream(fileInputStream);
this.gameDeck = (Deck)objInStream.readObject();
objInStream.close();
displayCard = gameDeck.GetCurrentCard();
}
catch (Exception FileNotFoundException)
{
Log.v(this.getLocalClassName(), "File not found exception!:" +
PlayActivity.SAVE_FILE_NAME);
this.gameDeck = new Deck();
displayCard = gameDeck.GetNextCard();
}
I am using an ObjectOutput/ObjectInput stream to handle saving and
loading the card deck. A 1.8Kb file is created when I save the
object. This seems like a resource heavy implementation. Is there a
better way of doing this for an embedded application?
Also, in order for the main menu to know whether a game has already
been started, it just checks whether the file exists or not:
protected void onStart()
{
String[] fileList,gameMenu;
super.onStart();
fileList = this.fileList();
gameMenu = mStrings;
for (String e: fileList)
{
if (e.equals(PlayActivity.SAVE_FILE_NAME))
{
gameMenu = mStringsResume;
}
}
// Prepare the ListView
final ArrayAdapter<String> adapter = new
ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, gameMenu);
setListAdapter(adapter);
}
Another question: Rather than using fileList() to determine if the
file exists, could I just try to open the file and catch the exception
if it doesn't exist, or is this more resource heavy as well?
Thx for any input,
Aaron
On Oct 29, 12:08 pm, AaronBC <[EMAIL PROTECTED]> wrote:
> I'm writing a simplegameso I can learn more about android
> development. I need a little help designing themenusystem. When
> you start the application you will see a simplemenu:
>
> Start NewGame
> ResumeGame(Dynamically shown after agamehas been started)
> Scoreboard
> Instructions
> About
>
> When you click on "Start NewGame" it starts a new "Play" activity
> (This works fine)
>
> The "ResumeGame" option should only be visible when agamehas
> already been started and the user returns to the mainmenu. How do I
> determine whether the "Play" activity has been started or not in order
> to display thismenuitem? Also, how do I handle the back button
> press when in the "Play" activity so that thegamestate is paused and
> not lost when returning to the mainmenu?
>
> Example:
> Thegameapplication is started and the user sees the following screen
>
> NewGame
> Scoreboard
> Instructions
> About
>
> The user then taps NewGameand starts to play. In the middle of thegamethe
> user hits the back button (or receives a phone call, starts
> another app, etc.) and sees the following screen when returning to thegameapp:
>
> NewGame
> ResumeGame
> Scoreboard
> Instructions
> About
>
> The user either taps "NewGame" and starts a newgameor taps "ResumeGame" and
> continues where he left off.
>
> How should I approach this using multiple Activities?
>
> Thx,
> Aaron
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