Initial live heartrate measurement in the live activity tab #178

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/HeartRateUtils.java

@@ -0,0 +1,6 @@
+package nodomain.freeyourgadget.gadgetbridge.activities;
+
+public class HeartRateUtils {
+    public static final int MAX_HEART_RATE_VALUE = 250;
+    public static final int MIN_HEART_RATE_VALUE = 0;
+}

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/charts/AbstractChartFragment.java

@@ -39,6 +39,7 @@ import java.util.Set;
 
 import nodomain.freeyourgadget.gadgetbridge.R;
 import nodomain.freeyourgadget.gadgetbridge.activities.AbstractGBFragment;
+import nodomain.freeyourgadget.gadgetbridge.activities.HeartRateUtils;
 import nodomain.freeyourgadget.gadgetbridge.database.DBAccess;
 import nodomain.freeyourgadget.gadgetbridge.database.DBHandler;
 import nodomain.freeyourgadget.gadgetbridge.devices.DeviceCoordinator;
@@ -116,6 +117,7 @@ public abstract class AbstractChartFragment extends AbstractGBFragment {
     protected int CHART_TEXT_COLOR;
     protected int LEGEND_TEXT_COLOR;
     protected int HEARTRATE_COLOR;
+    protected int HEARTRATE_FILL_COLOR;
     protected int AK_ACTIVITY_COLOR;
     protected int AK_DEEP_SLEEP_COLOR;
     protected int AK_LIGHT_SLEEP_COLOR;
@@ -152,6 +154,7 @@ public abstract class AbstractChartFragment extends AbstractGBFragment {
         CHART_TEXT_COLOR = getResources().getColor(R.color.secondarytext);
         LEGEND_TEXT_COLOR = getResources().getColor(R.color.primarytext);
         HEARTRATE_COLOR = getResources().getColor(R.color.chart_heartrate);
+        HEARTRATE_FILL_COLOR = getResources().getColor(R.color.chart_heartrate_fill);
         AK_ACTIVITY_COLOR = getResources().getColor(R.color.chart_activity_light);
         AK_DEEP_SLEEP_COLOR = getResources().getColor(R.color.chart_light_sleep_light);
         AK_LIGHT_SLEEP_COLOR = getResources().getColor(R.color.chart_deep_sleep_light);
@@ -518,7 +521,7 @@ public abstract class AbstractChartFragment extends AbstractGBFragment {
     }
 
     protected boolean isValidHeartRateValue(int value) {
-        return value > 0 && value < 255;
+        return value > HeartRateUtils.MIN_HEART_RATE_VALUE && value < HeartRateUtils.MAX_HEART_RATE_VALUE;
     }
 
     /**

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/charts/ActivitySleepChartFragment.java

@@ -20,6 +20,7 @@ import java.util.ArrayList;
 import java.util.List;
 
 import nodomain.freeyourgadget.gadgetbridge.R;
+import nodomain.freeyourgadget.gadgetbridge.activities.HeartRateUtils;
 import nodomain.freeyourgadget.gadgetbridge.database.DBHandler;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
 import nodomain.freeyourgadget.gadgetbridge.model.ActivitySample;
@@ -83,8 +84,8 @@ public class ActivitySleepChartFragment extends AbstractChartFragment {
         yAxisRight.setDrawLabels(true);
         yAxisRight.setDrawTopYLabelEntry(true);
         yAxisRight.setTextColor(CHART_TEXT_COLOR);
-        yAxisRight.setAxisMaxValue(250);
+        yAxisRight.setAxisMaxValue(HeartRateUtils.MAX_HEART_RATE_VALUE);
-        yAxisRight.setAxisMinValue(0);
+        yAxisRight.setAxisMinValue(HeartRateUtils.MIN_HEART_RATE_VALUE);
 
         // refresh immediately instead of use refreshIfVisible(), for perceived performance
         refresh();

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/charts/LiveActivityFragment.java

@@ -23,6 +23,7 @@ import com.github.mikephil.charting.components.YAxis;
 import com.github.mikephil.charting.data.BarData;
 import com.github.mikephil.charting.data.BarDataSet;
 import com.github.mikephil.charting.data.BarEntry;
+import com.github.mikephil.charting.data.ChartData;
 import com.github.mikephil.charting.data.Entry;
 import com.github.mikephil.charting.data.LineData;
 import com.github.mikephil.charting.data.LineDataSet;
@@ -39,10 +40,12 @@ import java.util.concurrent.TimeUnit;
 
 import nodomain.freeyourgadget.gadgetbridge.GBApplication;
 import nodomain.freeyourgadget.gadgetbridge.R;
+import nodomain.freeyourgadget.gadgetbridge.activities.HeartRateUtils;
 import nodomain.freeyourgadget.gadgetbridge.database.DBHandler;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
 import nodomain.freeyourgadget.gadgetbridge.model.ActivitySample;
 import nodomain.freeyourgadget.gadgetbridge.model.DeviceService;
+import nodomain.freeyourgadget.gadgetbridge.model.Measurement;
 import nodomain.freeyourgadget.gadgetbridge.util.GB;
 
 public class LiveActivityFragment extends AbstractChartFragment {
@@ -63,6 +66,9 @@ public class LiveActivityFragment extends AbstractChartFragment {
     private final Steps mSteps = new Steps();
     private ScheduledExecutorService pulseScheduler;
     private int maxStepsResetCounter;
+    private List<Measurement> heartRateValues;
+    private LineDataSet mHeartRateSet;
+    private int mHeartRate;
 
     private class Steps {
         private int initialSteps;
@@ -145,16 +151,36 @@ public class LiveActivityFragment extends AbstractChartFragment {
         public void onReceive(Context context, Intent intent) {
             String action = intent.getAction();
             switch (action) {
-                case DeviceService.ACTION_REALTIME_STEPS:
+                case DeviceService.ACTION_REALTIME_STEPS: {
                     int steps = intent.getIntExtra(DeviceService.EXTRA_REALTIME_STEPS, 0);
                     long timestamp = intent.getLongExtra(DeviceService.EXTRA_TIMESTAMP, System.currentTimeMillis());
-                    refreshCurrentSteps(steps, timestamp);
+                    addEntries(steps, timestamp);
                     break;
                 }
+                case DeviceService.ACTION_HEARTRATE_MEASUREMENT: {
+                    int heartRate = intent.getIntExtra(DeviceService.EXTRA_HEART_RATE_VALUE, 0);
+                    long timestamp = intent.getLongExtra(DeviceService.EXTRA_TIMESTAMP, System.currentTimeMillis());
+                    if (isValidHeartRateValue(heartRate)) {
+                        setCurrentHeartRate(heartRate, timestamp);
+                    }
+                    break;
+                }
+            }
         }
     };
 
-    private void refreshCurrentSteps(int steps, long timestamp) {
+    private void setCurrentHeartRate(int heartRate, long timestamp) {
+        addHistoryDataSet(true);
+        mHeartRate = heartRate;
+    }
+
+    private int getCurrentHeartRate() {
+        int result = mHeartRate;
+        mHeartRate = -1;
+        return result;
+    }
+
+    private void addEntries(int steps, long timestamp) {
         mSteps.updateCurrentSteps(steps, timestamp);
         if (++maxStepsResetCounter > RESET_COUNT) {
             maxStepsResetCounter = 0;
@@ -163,10 +189,10 @@ public class LiveActivityFragment extends AbstractChartFragment {
         // Or: count down the steps until goal reached? And then flash GOAL REACHED -> Set stretch goal
         LOG.info("Steps: " + steps + ", total: " + mSteps.getTotalSteps() + ", current: " + mSteps.getStepsPerMinute(false));
 
-//        refreshCurrentSteps();
+//        addEntries();
     }
 
-    private void refreshCurrentSteps() {
+    private void addEntries() {
         mTotalStepsChart.setSingleEntryYValue(mSteps.getTotalSteps());
         YAxis stepsPerMinuteCurrentYAxis = mStepsPerMinuteCurrentChart.getAxisLeft();
         int maxStepsPerMinute = mSteps.getMaxStepsPerMinute();
@@ -180,24 +206,36 @@ public class LiveActivityFragment extends AbstractChartFragment {
         int stepsPerMinute = mSteps.getStepsPerMinute(true);
         mStepsPerMinuteCurrentChart.setSingleEntryYValue(stepsPerMinute);
 
+        if (!addHistoryDataSet(false)) {
+            return;
+        }
+
+        ChartData data = mStepsPerMinuteHistoryChart.getData();
+        data.addXValue("");
+        if (stepsPerMinute < 0) {
+            stepsPerMinute = 0;
+        }
+        mHistorySet.addEntry(new Entry(stepsPerMinute, data.getXValCount() - 1));
+        int hr = getCurrentHeartRate();
+        if (hr < 0) {
+            hr = 0;
+        }
+        mHeartRateSet.addEntry(new Entry(hr, data.getXValCount() - 1));
+    }
+
+    private boolean addHistoryDataSet(boolean force) {
         if (mStepsPerMinuteHistoryChart.getData() == null) {
-            if (mSteps.getTotalSteps() == 0) {
+            // ignore the first default value to keep the "no-data-description" visible
-                return; // ignore the first default value to keep the "no-data-description" visible
+            if (force || mSteps.getTotalSteps() > 0) {
-            }
                 LineData data = new LineData();
-            mStepsPerMinuteHistoryChart.setData(data);
                 data.addDataSet(mHistorySet);
+                data.addDataSet(mHeartRateSet);
+                mStepsPerMinuteHistoryChart.setData(data);
+                return true;
             }
-
+            return false;
-        LineData historyData = (LineData) mStepsPerMinuteHistoryChart.getData();
+        }
-        historyData.addXValue("");
+        return true;
-        historyData.addEntry(new Entry(stepsPerMinute, mHistorySet.getEntryCount()), 0);
-
-        mTotalStepsData.notifyDataSetChanged();
-        mStepsPerMinuteData.notifyDataSetChanged();
-        mStepsPerMinuteHistoryChart.notifyDataSetChanged();
-
-        renderCharts();
     }
 
     @Nullable
@@ -205,6 +243,8 @@ public class LiveActivityFragment extends AbstractChartFragment {
     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         IntentFilter filterLocal = new IntentFilter();
         filterLocal.addAction(DeviceService.ACTION_REALTIME_STEPS);
+        filterLocal.addAction(DeviceService.ACTION_HEARTRATE_MEASUREMENT);
+        heartRateValues = new ArrayList<>();
 
         View rootView = inflater.inflate(R.layout.fragment_live_activity, container, false);
 
@@ -262,7 +302,22 @@ public class LiveActivityFragment extends AbstractChartFragment {
      * Called in the UI thread.
      */
     private void pulse() {
-        refreshCurrentSteps();
+        addEntries();
+
+        LineData historyData = (LineData) mStepsPerMinuteHistoryChart.getData();
+        if (historyData == null) {
+            return;
+        }
+
+        historyData.notifyDataChanged();
+        mTotalStepsData.notifyDataSetChanged();
+        mStepsPerMinuteData.notifyDataSetChanged();
+        mStepsPerMinuteHistoryChart.notifyDataSetChanged();
+
+        renderCharts();
+
+        // have to enable it again and again to keep it measureing
+        GBApplication.deviceService().onEnableRealtimeHeartRateMeasurement(true);
     }
 
     private long getPulseIntervalMillis() {
@@ -272,6 +327,7 @@ public class LiveActivityFragment extends AbstractChartFragment {
     @Override
     protected void onMadeVisibleInActivity() {
         GBApplication.deviceService().onEnableRealtimeSteps(true);
+        GBApplication.deviceService().onEnableRealtimeHeartRateMeasurement(true);
         super.onMadeVisibleInActivity();
         if (getActivity() != null) {
             getActivity().getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
@@ -281,6 +337,7 @@ public class LiveActivityFragment extends AbstractChartFragment {
     @Override
     protected void onMadeInvisibleInActivity() {
         GBApplication.deviceService().onEnableRealtimeSteps(false);
+        GBApplication.deviceService().onEnableRealtimeHeartRateMeasurement(false);
         if (getActivity() != null) {
             getActivity().getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
         }
@@ -346,6 +403,7 @@ public class LiveActivityFragment extends AbstractChartFragment {
     private void setupHistoryChart(BarLineChartBase chart) {
         configureBarLineChartDefaults(chart);
 
+        chart.setTouchEnabled(false); // no zooming or anything, because it's updated all the time
         chart.setBackgroundColor(BACKGROUND_COLOR);
         chart.setDescriptionColor(DESCRIPTION_COLOR);
         chart.setDescription(getString(R.string.live_activity_steps_per_minute_history));
@@ -367,22 +425,34 @@ public class LiveActivityFragment extends AbstractChartFragment {
         y.setDrawGridLines(false);
         y.setDrawTopYLabelEntry(false);
         y.setTextColor(CHART_TEXT_COLOR);
-
         y.setEnabled(true);
+        y.setAxisMinValue(0);
 
         YAxis yAxisRight = chart.getAxisRight();
         yAxisRight.setDrawGridLines(false);
-        yAxisRight.setEnabled(false);
+        yAxisRight.setEnabled(true);
-        yAxisRight.setDrawLabels(false);
+        yAxisRight.setDrawLabels(true);
         yAxisRight.setDrawTopYLabelEntry(false);
         yAxisRight.setTextColor(CHART_TEXT_COLOR);
+        yAxisRight.setAxisMaxValue(HeartRateUtils.MAX_HEART_RATE_VALUE);
+        yAxisRight.setAxisMinValue(HeartRateUtils.MIN_HEART_RATE_VALUE);
 
         mHistorySet = new LineDataSet(new ArrayList<Entry>(), getString(R.string.live_activity_steps_history));
+        mHistorySet.setAxisDependency(YAxis.AxisDependency.LEFT);
         mHistorySet.setColor(akActivity.color);
         mHistorySet.setDrawCircles(false);
         mHistorySet.setDrawCubic(true);
         mHistorySet.setDrawFilled(true);
         mHistorySet.setDrawValues(false);
+
+        mHeartRateSet = new LineDataSet(new ArrayList<Entry>(), getString(R.string.live_activity_heart_rate));
+        mHeartRateSet.setAxisDependency(YAxis.AxisDependency.RIGHT);
+        mHeartRateSet.setColor(HEARTRATE_COLOR);
+        mHeartRateSet.setDrawCircles(false);
+        mHeartRateSet.setDrawCubic(true);
+        mHeartRateSet.setDrawFilled(false);
+//        mHeartRateSet.setFillColor(HEARTRATE_FILL_COLOR);
+        mHeartRateSet.setDrawValues(false);
     }
 
     @Override

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/charts/SleepChartFragment.java

@@ -27,6 +27,7 @@ import java.util.List;
 import java.util.concurrent.TimeUnit;
 
 import nodomain.freeyourgadget.gadgetbridge.R;
+import nodomain.freeyourgadget.gadgetbridge.activities.HeartRateUtils;
 import nodomain.freeyourgadget.gadgetbridge.database.DBHandler;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
 import nodomain.freeyourgadget.gadgetbridge.model.ActivityAmount;
@@ -174,8 +175,8 @@ public class SleepChartFragment extends AbstractChartFragment {
         yAxisRight.setDrawLabels(true);
         yAxisRight.setDrawTopYLabelEntry(true);
         yAxisRight.setTextColor(CHART_TEXT_COLOR);
-        yAxisRight.setAxisMaxValue(250);
+        yAxisRight.setAxisMaxValue(HeartRateUtils.MAX_HEART_RATE_VALUE);
-        yAxisRight.setAxisMinValue(0);
+        yAxisRight.setAxisMinValue(HeartRateUtils.MIN_HEART_RATE_VALUE);
     }
 
     protected void setupLegend(Chart chart) {

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/EventHandler.java

@@ -44,6 +44,8 @@ public interface EventHandler {
 
     void onHeartRateTest();
 
+    void onEnableRealtimeHeartRateMeasurement(boolean enable);
+
     void onFindDevice(boolean start);
 
     void onScreenshotReq();

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/impl/GBDeviceService.java

@@ -216,4 +216,11 @@ public class GBDeviceService implements DeviceService {
                 .putExtra(EXTRA_BOOLEAN_ENABLE, enable);
         invokeService(intent);
     }
+
+    @Override
+    public void onEnableRealtimeHeartRateMeasurement(boolean enable) {
+        Intent intent = createIntent().setAction(ACTION_ENABLE_REALTIME_HEARTRATE_MEASUREMENT)
+                .putExtra(EXTRA_BOOLEAN_ENABLE, enable);
+        invokeService(intent);
+    }
 }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/model/DeviceService.java

@@ -33,7 +33,9 @@ public interface DeviceService extends EventHandler {
     String ACTION_SET_ALARMS = PREFIX + ".action.set_alarms";
     String ACTION_ENABLE_REALTIME_STEPS = PREFIX + ".action.enable_realtime_steps";
     String ACTION_REALTIME_STEPS = PREFIX + ".action.realtime_steps";
+    String ACTION_ENABLE_REALTIME_HEARTRATE_MEASUREMENT = PREFIX + ".action.realtime_hr_measurement";
     String ACTION_ENABLE_HEARTRATE_SLEEP_SUPPORT = PREFIX + ".action.enable_heartrate_sleep_support";
+    String ACTION_HEARTRATE_MEASUREMENT = PREFIX + ".action.hr_measurement";
     String EXTRA_DEVICE_ADDRESS = "device_address";
     String EXTRA_NOTIFICATION_BODY = "notification_body";
     String EXTRA_NOTIFICATION_FLAGS = "notification_flags";
@@ -62,6 +64,7 @@ public interface DeviceService extends EventHandler {
     String EXTRA_BOOLEAN_ENABLE = "enable_realtime_steps";
     String EXTRA_REALTIME_STEPS = "realtime_steps";
     String EXTRA_TIMESTAMP = "timestamp";
+    String EXTRA_HEART_RATE_VALUE = "hr_value";
 
     void start();
 

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/model/Measurement.java

@@ -0,0 +1,33 @@
+package nodomain.freeyourgadget.gadgetbridge.model;
+
+public class Measurement {
+    private final int value;
+    private final long timestamp;
+
+    public Measurement(int value, long timestamp) {
+        this.value = value;
+        this.timestamp = timestamp;
+    }
+
+    public int getValue() {
+        return value;
+    }
+
+    public long getTimestamp() {
+        return timestamp;
+    }
+
+    @Override
+    public int hashCode() {
+        return (int) (71 ^ value ^ timestamp);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (o instanceof Measurement) {
+            Measurement m = (Measurement) o;
+            return timestamp == m.timestamp && value == m.value;
+        }
+        return super.equals(o);
+    }
+}

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/DeviceCommunicationService.java

@@ -46,6 +46,7 @@ import static nodomain.freeyourgadget.gadgetbridge.model.DeviceService.ACTION_CO
 import static nodomain.freeyourgadget.gadgetbridge.model.DeviceService.ACTION_DELETEAPP;
 import static nodomain.freeyourgadget.gadgetbridge.model.DeviceService.ACTION_DISCONNECT;
 import static nodomain.freeyourgadget.gadgetbridge.model.DeviceService.ACTION_ENABLE_HEARTRATE_SLEEP_SUPPORT;
+import static nodomain.freeyourgadget.gadgetbridge.model.DeviceService.ACTION_ENABLE_REALTIME_HEARTRATE_MEASUREMENT;
 import static nodomain.freeyourgadget.gadgetbridge.model.DeviceService.ACTION_ENABLE_REALTIME_STEPS;
 import static nodomain.freeyourgadget.gadgetbridge.model.DeviceService.ACTION_FETCH_ACTIVITY_DATA;
 import static nodomain.freeyourgadget.gadgetbridge.model.DeviceService.ACTION_FIND_DEVICE;
@@ -349,6 +350,11 @@ public class DeviceCommunicationService extends Service {
                 mDeviceSupport.onEnableHeartRateSleepSupport(enable);
                 break;
             }
+            case ACTION_ENABLE_REALTIME_HEARTRATE_MEASUREMENT: {
+                boolean enable = intent.getBooleanExtra(EXTRA_BOOLEAN_ENABLE, false);
+                mDeviceSupport.onEnableRealtimeHeartRateMeasurement(enable);
+                break;
+            }
         }
 
         return START_STICKY;

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/ServiceDeviceSupport.java

@@ -250,4 +250,12 @@ public class ServiceDeviceSupport implements DeviceSupport {
         }
         delegate.onEnableHeartRateSleepSupport(enable);
     }
+
+    @Override
+    public void onEnableRealtimeHeartRateMeasurement(boolean enable) {
+        if (checkBusy("enable realtime heart rate measurement: " + enable)) {
+            return;
+        }
+        delegate.onEnableRealtimeHeartRateMeasurement(enable);
+    }
 }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/miband/MiBandSupport.java

@@ -603,7 +603,6 @@ public class MiBandSupport extends AbstractBTLEDeviceSupport {
                 TransactionBuilder builder = performInitialized("HeartRateTest");
                 builder.write(getCharacteristic(MiBandService.UUID_CHARACTERISTIC_HEART_RATE_CONTROL_POINT), stopHeartMeasurementContinuous);
                 builder.write(getCharacteristic(MiBandService.UUID_CHARACTERISTIC_HEART_RATE_CONTROL_POINT), stopHeartMeasurementManual);
-                builder.write(getCharacteristic(MiBandService.UUID_CHARACTERISTIC_HEART_RATE_CONTROL_POINT), stopHeartMeasurementSleep);
                 builder.write(getCharacteristic(MiBandService.UUID_CHARACTERISTIC_HEART_RATE_CONTROL_POINT), startHeartMeasurementManual);
                 builder.queue(getQueue());
             } catch (IOException ex) {
@@ -614,6 +613,25 @@ public class MiBandSupport extends AbstractBTLEDeviceSupport {
         }
     }
 
+    @Override
+    public void onEnableRealtimeHeartRateMeasurement(boolean enable) {
+        if (supportsHeartRate()) {
+            try {
+                TransactionBuilder builder = performInitialized("EnableRealtimeHeartRateMeasurement");
+                if (enable) {
+                    builder.write(getCharacteristic(MiBandService.UUID_CHARACTERISTIC_HEART_RATE_CONTROL_POINT), stopHeartMeasurementManual);
+                    builder.write(getCharacteristic(MiBandService.UUID_CHARACTERISTIC_HEART_RATE_CONTROL_POINT), stopHeartMeasurementSleep);
+                    builder.write(getCharacteristic(MiBandService.UUID_CHARACTERISTIC_HEART_RATE_CONTROL_POINT), startHeartMeasurementContinuous);
+                } else {
+                    builder.write(getCharacteristic(MiBandService.UUID_CHARACTERISTIC_HEART_RATE_CONTROL_POINT), stopHeartMeasurementContinuous);
+                }
+                builder.queue(getQueue());
+            } catch (IOException ex) {
+                LOG.error("Unable to enable realtime heart rate measurement in  MI1S", ex);
+            }
+        }
+    }
+
     public boolean supportsHeartRate() {
         return getDeviceInfo() != null && getDeviceInfo().supportsHeartrate();
     }
@@ -745,7 +763,7 @@ public class MiBandSupport extends AbstractBTLEDeviceSupport {
         } else if (MiBandService.UUID_CHARACTERISTIC_REALTIME_STEPS.equals(characteristicUUID)) {
             handleRealtimeSteps(characteristic.getValue());
         } else if (MiBandService.UUID_CHARACTERISTIC_HEART_RATE_MEASUREMENT.equals(characteristicUUID)) {
-            logHeartrate(characteristic.getValue());
+            handleHeartrate(characteristic.getValue());
         } else {
             LOG.info("Unhandled characteristic changed: " + characteristicUUID);
             logMessageContent(characteristic.getValue());
@@ -814,6 +832,15 @@ public class MiBandSupport extends AbstractBTLEDeviceSupport {
         }
     }
 
+    private void handleHeartrate(byte[] value) {
+        if (value.length == 2 && value[0] == 6) {
+            int hrValue = (value[1] & 0xff);
+            Intent intent = new Intent(DeviceService.ACTION_HEARTRATE_MEASUREMENT)
+                    .putExtra(DeviceService.EXTRA_HEART_RATE_VALUE, hrValue)
+                    .putExtra(DeviceService.EXTRA_TIMESTAMP, System.currentTimeMillis());
+            LocalBroadcastManager.getInstance(getContext()).sendBroadcast(intent);
+        }
+    }
 
     private void handleRealtimeSteps(byte[] value) {
         int steps = 0xff & value[0] | (0xff & value[1]) << 8;

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/serial/AbstractSerialDeviceSupport.java

@@ -181,4 +181,10 @@ public abstract class AbstractSerialDeviceSupport extends AbstractDeviceSupport
         byte[] bytes = gbDeviceProtocol.encodeEnableHeartRateSleepSupport(enable);
         sendToDevice(bytes);
     }
+
+    @Override
+    public void onEnableRealtimeHeartRateMeasurement(boolean enable) {
+        byte[] bytes = gbDeviceProtocol.encodeEnableRealtimeHeartRateMeasurement(enable);
+        sendToDevice(bytes);
+    }
 }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/serial/GBDeviceProtocol.java

@@ -63,6 +63,8 @@ public abstract class GBDeviceProtocol {
         return null;
     }
 
+    public byte[] encodeEnableRealtimeHeartRateMeasurement(boolean enable) { return null; }
+
     public GBDeviceEvent[] decodeResponse(byte[] responseData) {
         return null;
     }

app/src/main/res/values/colors.xml

@@ -12,6 +12,7 @@
     <color name="divider" type="color">#1f000000</color>
 
     <color name="chart_heartrate" type="color">#ffab40</color>
+    <color name="chart_heartrate_fill" type="color">#fadab1</color>
     <color name="chart_deep_sleep_light" type="color">#0071b7</color>
     <color name="chart_deep_sleep_dark" type="color">#4c5aff</color>
 

app/src/main/res/values/strings.xml

@@ -240,5 +240,6 @@
     <string name="updatefirmwareoperation_update_in_progress">Firmware update in progress</string>
     <string name="updatefirmwareoperation_firmware_not_sent">Firmware not sent</string>
     <string name="charts_legend_heartrate">Heart Rate</string>
+    <string name="live_activity_heart_rate">Heart Rate</string>
 
 </resources>

app/src/test/java/nodomain/freeyourgadget/gadgetbridge/service/TestDeviceSupport.java

@@ -129,4 +129,9 @@ public class TestDeviceSupport extends AbstractDeviceSupport {
     public void onEnableHeartRateSleepSupport(boolean enable) {
 
     }
+
+    @Override
+    public void onEnableRealtimeHeartRateMeasurement(boolean enable) {
+
+    }
 }