下面是60秒的倒计时
activity
public class MainActivity extends AppCompatActivity { private TextView time; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); time = findViewById(R.id.timer); CountDownTimer timer = new CountDownTimer(1000L*60*60,1000L) { @Override public void onTick(long l) { // time.setText( (l/60)+"秒"); } @Override public void onFinish() { } }; timer.start(); } }布局就是textview,用来设置显示的时间。