Cleanup: renamed GainManager to AltitudeChangeHandler.

src/main/java/de/dennisguse/opentracks/sensors/AltitudeChangeHandler.java

@@ -0,0 +1,50 @@
+package de.dennisguse.opentracks.sensors;
+
+import androidx.annotation.NonNull;
+
+import de.dennisguse.opentracks.R;
+import de.dennisguse.opentracks.data.models.AtmosphericPressure;
+import de.dennisguse.opentracks.sensors.driver.BarometerBluetooth;
+import de.dennisguse.opentracks.sensors.driver.BarometerInternal;
+import de.dennisguse.opentracks.sensors.driver.BluetoothDriver;
+import de.dennisguse.opentracks.sensors.driver.Driver;
+import de.dennisguse.opentracks.sensors.sensorData.Aggregator;
+import de.dennisguse.opentracks.sensors.sensorData.AggregatorBarometer;
+
+/**
+ * Estimates the altitude gain and altitude loss using the device's pressure sensor (i.e., barometer).
+ */
+//TODO Rename class
+public class AltitudeChangeHandler extends SensorHandler<AtmosphericPressure> {
+
+    public AltitudeChangeHandler(SensorManager sensorManager) {
+        super(sensorManager);
+    }
+
+    @Override
+    protected int getSensorPreferenceKey() {
+        return R.string.settings_sensor_bluetooth_pressure_key;
+    }
+
+    @NonNull
+    @Override
+    protected Driver createDriverInternal() {
+        return new BarometerInternal(driverObserver);
+    }
+
+    @NonNull
+    @Override
+    protected Driver createDriverBluetooth(String address) {
+        return new BluetoothDriver<>(
+                BluetoothUtils.getAdapter(getContext()),
+                driverObserver,
+                new BarometerBluetooth()
+        );
+    }
+
+    @NonNull
+    @Override
+    public Aggregator<AtmosphericPressure, ?> createAggregator() {
+        return new AggregatorBarometer("", null);
+    }
+}