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Here is some basic code to make a timer that counts down.
You can specify the start value you want and the amount you want it to count down by.

package com.android.countdown;
import android.app.Activity;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.widget.TextView;

public class CountDownTest extends Activity {

TextView tv; //textview to display the countdown

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

tv = new TextView(this);
this.setContentView(tv);

//5000 is the starting number (in milliseconds)
//1000 is the number to count down each time (in milliseconds)
MyCount counter = new MyCount(5000,1000);

counter.start();

}

//countdowntimer is an abstract class, so extend it and fill in methods
public class MyCount extends CountDownTimer{

public MyCount(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);
}

@Override
public void onFinish() {
tv.setText(”done!”);
}

@Override
public void onTick(long millisUntilFinished) {
tv.setText(”Left: ” + millisUntilFinished/1000);

}
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