java - 安卓/JAVA : Get current time based on timezone

Question

关于我上面的问题，我想根据时区(吉隆坡)获取当前日期时间。我可以知道该怎么做吗？

下面是我当前的代码:

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

    btnTime = findViewById(R.id.btnTime);
    tvTime = findViewById(R.id.tvTime);

    btnTime.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Calendar calendar = Calendar.getInstance();
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss",  Locale.getDefault());

            String time = "Current time - " + format.format(calendar.getTime());

            tvTime.setText(time);
        }
    });

}

Answer 1

马来西亚遵守 GMT+8，您可以像这样设置 SimpleDateFormat 的 TimeZone

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.getDefault());
format.setTimeZone(TimeZone.getTimeZone("GMT+08:00"));
String time = "Current time - " + format.format(calendar.getTime());

或者，更好的是，切换到 ThreeTenABP java.time 的向后移植，例如

ZonedDateTime klDateTime = LocalDateTime.now().atZone(ZoneId.of("Asia/Kuala_Lumpur"));
String time = "Current time - " + klDateTime.format(DateTimeFormatter
        .ofPattern("yyyy-MM-dd HH:mm:ss"));