82 lines
2.6 KiB
Java
82 lines
2.6 KiB
Java
package nodomain.freeyourgadget.gadgetbridge.devices.miband;
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import java.util.Calendar;
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import java.util.GregorianCalendar;
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public class MiBandDateConverter {
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/**
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* Creates a calendar object representing the current date and time.
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*/
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public static GregorianCalendar createCalendar() {
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return new GregorianCalendar();
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}
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/**
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* uses the standard algorithm to convert bytes received from the MiBand to a Calendar object
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*
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* @param value
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* @return
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*/
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public static GregorianCalendar rawBytesToCalendar(byte[] value) {
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if (value.length == 6) {
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return rawBytesToCalendar(value, 0);
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}
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return createCalendar();
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}
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/**
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* uses the standard algorithm to convert bytes received from the MiBand to a Calendar object
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*
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* @param value
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* @return
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*/
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public static GregorianCalendar rawBytesToCalendar(byte[] value, int offset) {
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if (value.length - offset >= 6) {
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GregorianCalendar timestamp = new GregorianCalendar(
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value[offset] + 2000,
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value[offset + 1],
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value[offset + 2],
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value[offset + 3],
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value[offset + 4],
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value[offset + 5]);
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int offsetInHours = MiBandCoordinator.getDeviceTimeOffsetHours();
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if(offsetInHours != 0)
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timestamp.add(Calendar.HOUR_OF_DAY,-offsetInHours);
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return timestamp;
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}
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return createCalendar();
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}
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/**
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* uses the standard algorithm to convert a Calendar object to a byte array to send to MiBand
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*
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* @param timestamp
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* @return
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*/
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public static byte[] calendarToRawBytes(Calendar timestamp) {
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// The mi-band device currently records sleep
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// only if it happens after 10pm and before 7am.
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// The offset is used to trick the device to record sleep
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// in non-standard hours.
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// If you usually sleep, say, from 6am to 2pm, set the
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// shift to -8, so at 6am the device thinks it's still 10pm
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// of the day before.
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int offsetInHours = MiBandCoordinator.getDeviceTimeOffsetHours();
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if(offsetInHours != 0)
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timestamp.add(Calendar.HOUR_OF_DAY,offsetInHours);
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return new byte[]{
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(byte) (timestamp.get(Calendar.YEAR) - 2000),
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(byte) timestamp.get(Calendar.MONTH),
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(byte) timestamp.get(Calendar.DATE),
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(byte) timestamp.get(Calendar.HOUR_OF_DAY),
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(byte) timestamp.get(Calendar.MINUTE),
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(byte) timestamp.get(Calendar.SECOND)
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};
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}
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}
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