体温登记day2

要求：开发一个手机端上报体温的手机APP，上报内容包括姓名、日期（自动生成）、时间（自动生成）和体温。

自动生成日期和时间

利用了Calendar来获取系统时间。首先用Calendar.getInstance()函数获取一个实例，再使用Calendar.get()函数来获取时间的具体信息，如年、月、日、小时、分、秒等。需要注意的是获取hour时可以利用Calendar.AM_PM来判断上下午。

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tv_date = (TextView) findViewById(R.id.textView1);
        tv_time = (TextView) findViewById(R.id.textView2);

        cal = Calendar.getInstance();
        year = String.valueOf(cal.get(Calendar.YEAR));
        month = String.valueOf(cal.get(Calendar.MONTH)) + 1;
        day = String.valueOf(cal.get(Calendar.DATE));
        if (cal.get(Calendar.AM_PM) == 0) {
            if (cal.get(Calendar.HOUR) < 10) {
                hour = "0" + cal.get(Calendar.HOUR);
            } else {
                hour = String.valueOf(cal.get(Calendar.HOUR));
            }
        }
        else {
            hour = String.valueOf(cal.get(Calendar.HOUR) + 12);
        }
        if (cal.get(Calendar.MINUTE) < 10) {
            minute = "0" + cal.get(Calendar.MINUTE);
        } else {
            minute = String.valueOf(cal.get(Calendar.MINUTE));
        }
        if (cal.get(Calendar.SECOND) < 10) {
            second = "0" + cal.get(Calendar.SECOND);
        } else {
            second = String.valueOf(cal.get(Calendar.SECOND));
        }
        my_time_1 = year + "-" + month + "-" + day;
        my_time_2 = hour + ":" + minute + ":" + second;
        tv_date.setText(my_time_1);
        tv_time.setText(my_time_2);

    }