I also agree with Ted on this, but it looks like you can just show the logo for a while without doing any background work. If you are looking for something that ends based on time rather than work, check out the code below:
waitTimer = new CountDownTimer(60000, 300) {
public void onTick(long millisUntilFinished) {
}
public void onFinish() {
}
}.start();
But Ted has the right answer for a genuine boot screen, which ends after shutting down.
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