如何将计时器用作Android中的倒数计时器

Question

I have defined a chronometer;

protected Chronometer chrono;
protected int baseTime;
protected int stopTime;
protected long elapsedTime;

My program asks questions to the user and i want to set a timer based on the user's input. I want a timer which starts at 10 to 0. How can i do that?

Also, I want to show the remaining time on the screen.

Answer 1

Use CountDownTImer instead,

 new CountDownTimer(10000, 1000) { //Sets 10 second remaining

 public void onTick(long millisUntilFinished) {
     mTextView.setText("seconds remaining: " + millisUntilFinished / 1000);
 }

 public void onFinish() {
     mTextView.setText("done!");
 }
}.start();

Note : It's not possible to start Chronometer reversely because the Chronometer widget only counts up.

Edit: From API level 24, it is possible to perform count down using chronometer via help of Chronometer#setCountDown(true) method.