SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss");// HH:mm:ss
//获取当前时间
Date date = new Date(System.currentTimeMillis());
time1.setText("Date获取当前日期时间"+simpleDateFormat.format(date));

Calendar calendar = Calendar.getInstance();
//获取系统的日期
//年
int year = calendar.get(Calendar.YEAR);
//月
int month = calendar.get(Calendar.MONTH)+1;
//日
int day = calendar.get(Calendar.DAY_OF_MONTH);
//获取系统时间
//小时
int hour = calendar.get(Calendar.HOUR_OF_DAY);
//分钟
int minute = calendar.get(Calendar.MINUTE);
//秒
int second = calendar.get(Calendar.SECOND);
 
time2.setText("Calendar获取当前日期"+year+"年"+month+"月"+day+"日"+hour+":"+minute+":"+second);

Time t=new Time(); // or Time t=new Time("GMT+8"); 加上Time Zone资料。
t.setToNow(); // 取得系统时间。
int year = t.year;
int month = t.month+1;
int day = t.monthDay;
int hour = t.hour; // 0-23
int minute = t.minute;
int second = t.second;
time3.setText("Calendar获取当前日期"+year+"年"+month+"月"+day+"日"+hour+":"+minute+":"+second);

TextView time1 = (TextView) findViewById(R.id.tv_time1);
TextView time2 = (TextView) findViewById(R.id.tv_time2);
TextView time3 = (TextView) findViewById(R.id.tv_time3);

<TextView

        android:id="@+id/tv_time1"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:gravity="center"
        android:text="时间"/>