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Can you please help me answer the following questions?
How do people usually implement a timed event in games?
Example: You reach some point in time and something happens like a new wave of enemies appears or something similar.
What is the best way to make sprite animations?
Example: Explosions in an android game.
1) Every time round your game loop you will want to record the elapsed time (or delta time.) This means you could keep track of the time past since the game start and the time it took to execute one iteration of your loop (the latter is good for time based movement.)
2) Depends really, I’m assuming this is 2D so I personally use sprite maps (google it) and then after x seconds I will change the image that is being rendered to the next on in the animation sequence. Animation sequences normally consist of “frames” and after x seconds have passed then move to the next frame