public class MainActivity extends AppCompatActivity { private CountdownTimer timer = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final SeekBar sb = (SeekBar) findViewById(R.id.seekBar); sb.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { @Override public void onProgressChanged(SeekBar seekBar, int i, boolean b) {} @Override public void onStartTrackingTouch(SeekBar seekBar) {} @Override public void onStopTrackingTouch(SeekBar seekBar) { restartTimer(seekBar); } } final Button bt_stop = (Button) findViewById(R.id.btn1); bt_stop.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if(timer != null) { timer.cancel(); } } }); } private void restartTimer(SeekBar sb) { if(timer!=null) { timer.cancel(); } final long millis = TimeUnit.SECONDS.toMillis(sb.getProgress()); final long interval = TimeUnit.SECONDS.toMillis(1); timer = new CountdownTimer(millis, interval) { @Override public void onTick(long millisUntilFinished) { tv.setText(String.format("Seconds Remaining: %d", TimeUnit.MILLIS.toSeconds(millisUntilFinished)); } @Override public void onFinish() { tv.setText("done!"); } } timer.start(); }
}