一、需求和技术

1、实现5,4,3,2,1启动页倒计时

2、倒计时实现使用CountDownTimer

二、activity代码

public class OpenActivity extends AppCompatActivity {private Button in;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_open);DBHelper.GetInstance(this.getApplication()).init();in = findViewById(R.id.in);CountDownTimer timer = new CountDownTimer(5000, 1000) {public void onTick(long millisUntilFinished) {in.setText(millisUntilFinished / 1000 + "秒");}public void onFinish() {finishView();}};timer.start();