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;
    @Override
    protected 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();