I'm developing a video game for Android and I have a couple of doubts:
1) How can I make that the mobile doesn't suspend while I have the game running?
2) If I minimize my game and then open another, if I come back again to my game, the game restarts. I think Android destroys it because is not being used. What can I do to avoid this? I don't want that my game restarts if I open another.
1) You can use a WAKE_LOCK. Look at the permission android.permission.WAKE_LOCK
2) This time, look at the Android lifecycle. That can be a memory leak too, there is some tools to track that. You can find a tutorial on the Android blog. If there is no memory leak may be you use the "savedinstancestate" to run your game when you have paused. One more time, I recommand that tutorial from the documentation that explain how to save your activity state and recreate it.
edit : More information about wakelock :
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, "My Tag");
wl.acquire();
And mainly do not forget to release your wakelock
wl.release();