269 lines
12 KiB
Java
269 lines
12 KiB
Java
package nodomain.freeyourgadget.gadgetbridge.service.devices.miband.operations;
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import android.bluetooth.BluetoothGatt;
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import android.bluetooth.BluetoothGattCharacteristic;
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import android.database.sqlite.SQLiteDatabase;
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import android.widget.Toast;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.io.IOException;
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import java.text.DateFormat;
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import java.util.Calendar;
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import java.util.GregorianCalendar;
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import java.util.UUID;
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import java.util.concurrent.TimeUnit;
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import nodomain.freeyourgadget.gadgetbridge.GBApplication;
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import nodomain.freeyourgadget.gadgetbridge.R;
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import nodomain.freeyourgadget.gadgetbridge.database.DBHandler;
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import nodomain.freeyourgadget.gadgetbridge.devices.SampleProvider;
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import nodomain.freeyourgadget.gadgetbridge.devices.miband.MiBandCoordinator;
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import nodomain.freeyourgadget.gadgetbridge.devices.miband.MiBandService;
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import nodomain.freeyourgadget.gadgetbridge.service.btle.AbstractBTLEOperation;
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import nodomain.freeyourgadget.gadgetbridge.service.btle.TransactionBuilder;
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import nodomain.freeyourgadget.gadgetbridge.service.btle.actions.SetDeviceBusyAction;
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import nodomain.freeyourgadget.gadgetbridge.service.devices.miband.MiBandSupport;
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import nodomain.freeyourgadget.gadgetbridge.util.DateTimeUtils;
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import nodomain.freeyourgadget.gadgetbridge.util.GB;
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public class FetchActivityOperation extends AbstractBTLEOperation<MiBandSupport> {
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private static final Logger LOG = LoggerFactory.getLogger(FetchActivityOperation.class);
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private static final byte[] fetch = new byte[]{MiBandService.COMMAND_FETCH_DATA};
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//temporary buffer, size is a multiple of 60 because we want to store complete minutes (1 minute = 3 bytes)
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private static final int activityDataHolderSize = 3 * 60 * 4; // 8h
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private static class ActivityStruct {
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public byte[] activityDataHolder = new byte[activityDataHolderSize];
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//index of the buffer above
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public int activityDataHolderProgress = 0;
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//number of bytes we will get in a single data transfer, used as counter
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public int activityDataRemainingBytes = 0;
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//same as above, but remains untouched for the ack message
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public int activityDataUntilNextHeader = 0;
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//timestamp of the single data transfer, incremented to store each minute's data
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public GregorianCalendar activityDataTimestampProgress = null;
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//same as above, but remains untouched for the ack message
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public GregorianCalendar activityDataTimestampToAck = null;
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}
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private ActivityStruct activityStruct;
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public FetchActivityOperation(MiBandSupport support) {
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super(support);
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}
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@Override
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public void perform() throws IOException {
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TransactionBuilder builder = performInitialized("fetch activity data");
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// builder.write(getCharacteristic(MiBandService.UUID_CHARACTERISTIC_LE_PARAMS), getLowLatency());
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builder.add(new SetDeviceBusyAction(getDevice(), getContext().getString(R.string.busy_task_fetch_activity_data), getContext()));
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builder.write(getCharacteristic(MiBandService.UUID_CHARACTERISTIC_CONTROL_POINT), fetch);
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builder.queue(getQueue());
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}
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@Override
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public void onCharacteristicChanged(BluetoothGatt gatt,
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BluetoothGattCharacteristic characteristic) {
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UUID characteristicUUID = characteristic.getUuid();
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if (MiBandService.UUID_CHARACTERISTIC_ACTIVITY_DATA.equals(characteristicUUID)) {
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handleActivityNotif(characteristic.getValue());
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} else {
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super.onCharacteristicChanged(gatt, characteristic);
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}
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}
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private void handleActivityFetchFinish() {
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LOG.info("Fetching activity data has finished.");
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activityStruct = null;
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unsetBusy();
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}
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/**
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* Method to handle the incoming activity data.
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* There are two kind of messages we currently know:
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* - the first one is 11 bytes long and contains metadata (how many bytes to expect, when the data starts, etc.)
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* - the second one is 20 bytes long and contains the actual activity data
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*
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* The first message type is parsed by this method, for every other length of the value param, bufferActivityData is called.
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* @see #bufferActivityData(byte[])
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*
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*
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* @param value
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*/
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private void handleActivityNotif(byte[] value) {
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boolean firstChunk = activityStruct == null;
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if (firstChunk) {
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activityStruct = new ActivityStruct();
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}
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if (value.length == 11) {
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// byte 0 is the data type: 1 means that each minute is represented by a triplet of bytes
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int dataType = value[0];
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// byte 1 to 6 represent a timestamp
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GregorianCalendar timestamp = parseTimestamp(value, 1);
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// counter of all data held by the band
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int totalDataToRead = (value[7] & 0xff) | ((value[8] & 0xff) << 8);
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totalDataToRead *= (dataType == 1) ? 3 : 1;
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// counter of this data block
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int dataUntilNextHeader = (value[9] & 0xff) | ((value[10] & 0xff) << 8);
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dataUntilNextHeader *= (dataType == 1) ? 3 : 1;
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// there is a total of totalDataToRead that will come in chunks (3 bytes per minute if dataType == 1),
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// these chunks are usually 20 bytes long and grouped in blocks
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// after dataUntilNextHeader bytes we will get a new packet of 11 bytes that should be parsed
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// as we just did
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if (firstChunk && dataUntilNextHeader != 0) {
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GB.toast(getContext().getString(R.string.user_feedback_miband_activity_data_transfer,
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DateTimeUtils.formatDurationHoursMinutes((totalDataToRead / 3), TimeUnit.MINUTES),
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DateFormat.getDateTimeInstance().format(timestamp.getTime())), Toast.LENGTH_LONG, GB.INFO);
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}
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LOG.info("total data to read: " + totalDataToRead + " len: " + (totalDataToRead / 3) + " minute(s)");
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LOG.info("data to read until next header: " + dataUntilNextHeader + " len: " + (dataUntilNextHeader / 3) + " minute(s)");
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LOG.info("TIMESTAMP: " + DateFormat.getDateTimeInstance().format(timestamp.getTime()).toString() + " magic byte: " + dataUntilNextHeader);
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activityStruct.activityDataRemainingBytes = activityStruct.activityDataUntilNextHeader = dataUntilNextHeader;
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activityStruct.activityDataTimestampToAck = (GregorianCalendar) timestamp.clone();
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activityStruct.activityDataTimestampProgress = timestamp;
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} else {
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bufferActivityData(value);
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}
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LOG.debug("activity data: length: " + value.length + ", remaining bytes: " + activityStruct.activityDataRemainingBytes);
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if (activityStruct.activityDataRemainingBytes == 0) {
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sendAckDataTransfer(activityStruct.activityDataTimestampToAck, activityStruct.activityDataUntilNextHeader);
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}
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}
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/**
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* Method to store temporarily the activity data values got from the Mi Band.
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*
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* Since we expect chunks of 20 bytes each, we do not store the received bytes it the length is different.
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*
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* @param value
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*/
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private void bufferActivityData(byte[] value) {
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if (activityStruct.activityDataRemainingBytes >= value.length) {
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//I don't like this clause, but until we figure out why we get different data sometimes this should work
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if (value.length == 20 || value.length == activityStruct.activityDataRemainingBytes) {
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System.arraycopy(value, 0, activityStruct.activityDataHolder, activityStruct.activityDataHolderProgress, value.length);
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activityStruct.activityDataHolderProgress += value.length;
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activityStruct.activityDataRemainingBytes -= value.length;
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if (this.activityDataHolderSize == activityStruct.activityDataHolderProgress) {
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flushActivityDataHolder();
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}
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} else {
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// the length of the chunk is not what we expect. We need to make sense of this data
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LOG.warn("GOT UNEXPECTED ACTIVITY DATA WITH LENGTH: " + value.length + ", EXPECTED LENGTH: " + activityStruct.activityDataRemainingBytes);
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for (byte b : value) {
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LOG.warn("DATA: " + String.format("0x%8x", b));
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}
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}
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} else {
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LOG.error("error buffering activity data: remaining bytes: " + activityStruct.activityDataRemainingBytes + ", received: " + value.length);
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}
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}
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/**
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* empty the local buffer for activity data, arrange the values received in groups of three and
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* store them in the DB
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*/
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private void flushActivityDataHolder() {
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if (activityStruct == null) {
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LOG.debug("nothing to flush, struct is already null");
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return;
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}
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LOG.debug("flushing activity data holder");
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byte category, intensity, steps;
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DBHandler dbHandler = null;
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try {
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dbHandler = GBApplication.acquireDB();
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try (SQLiteDatabase db = dbHandler.getWritableDatabase()) { // explicitly keep the db open while looping over the samples
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for (int i = 0; i < activityStruct.activityDataHolderProgress; i += 3) { //TODO: check if multiple of 3, if not something is wrong
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category = activityStruct.activityDataHolder[i];
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intensity = activityStruct.activityDataHolder[i + 1];
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steps = activityStruct.activityDataHolder[i + 2];
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dbHandler.addGBActivitySample(
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(int) (activityStruct.activityDataTimestampProgress.getTimeInMillis() / 1000),
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SampleProvider.PROVIDER_MIBAND,
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(short) (intensity & 0xff),
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(short) (steps & 0xff),
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category);
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activityStruct.activityDataTimestampProgress.add(Calendar.MINUTE, 1);
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}
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} finally {
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activityStruct.activityDataHolderProgress = 0;
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}
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} catch (Exception ex) {
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GB.toast(getContext(), ex.getMessage(), Toast.LENGTH_LONG, GB.ERROR);
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} finally {
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if (dbHandler != null) {
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dbHandler.release();
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}
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}
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}
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/**
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* Acknowledge the transfer of activity data to the Mi Band.
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*
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* After receiving data from the band, it has to be acknowledged. This way the Mi Band will delete
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* the data it has on record.
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*
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* @param time
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* @param bytesTransferred
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*/
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private void sendAckDataTransfer(Calendar time, int bytesTransferred) {
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byte[] ackTime = MiBandCoordinator.calendarToRawBytes(time);
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byte[] ack = new byte[]{
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MiBandService.COMMAND_CONFIRM_ACTIVITY_DATA_TRANSFER_COMPLETE,
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ackTime[0],
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ackTime[1],
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ackTime[2],
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ackTime[3],
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ackTime[4],
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ackTime[5],
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(byte) (bytesTransferred & 0xff),
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(byte) (0xff & (bytesTransferred >> 8))
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};
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try {
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TransactionBuilder builder = performInitialized("send acknowledge");
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builder.write(getCharacteristic(MiBandService.UUID_CHARACTERISTIC_CONTROL_POINT), ack);
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builder.queue(getQueue());
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// flush to the DB after sending the ACK
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flushActivityDataHolder();
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//The last data chunk sent by the miband has always length 0.
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//When we ack this chunk, the transfer is done.
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if (getDevice().isBusy() && bytesTransferred == 0) {
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handleActivityFetchFinish();
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}
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} catch (IOException ex) {
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LOG.error("Unable to send ack to MI", ex);
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}
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}
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private GregorianCalendar parseTimestamp(byte[] value, int offset) {
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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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return timestamp;
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}
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}
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