o Adding 'recently seen' on BtDevice. Updated when scanning.

o Removing BtScanResult, it was never used.
o Getting MainActivity to listen on device property changed so the UI is properly updated.
o Adding a status bar with color to indicate if the device is available, connected or not seen.

18 files changed, 455 insertions, 152 deletions

diff --git a/.gitignore b/.gitignore
index f0134ac..19530d1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,5 @@ local.properties
 .idea
 /build
 *.iml
+*.tmp
+*.tmp.*
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 500bd8d..3edd865 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-          package="io.trygvis.soilmoisture">
+<manifest
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    package="io.trygvis.soilmoisture">
 
     <!--
     Declare this required feature if you want to make the app available to BLE-capable
@@ -21,7 +22,6 @@
         android:icon="@drawable/ic_launcher"
         android:label="@string/app_name"
         android:theme="@style/AppTheme">
-
         <activity
             android:name=".MainActivity"
             android:label="@string/app_name">
@@ -31,7 +31,6 @@
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
         </activity>
-
         <activity
             android:name=".SoilActivity"
             android:label="@string/title_activity_soil">
@@ -45,7 +44,6 @@
                 android:name="io.trygvis.android.bt.DefaultBtService.migration"
                 android:value="db/migration/sm"/>
         </service>
-
         <service
             android:name=".DefaultSoilMoistureService"
             android:enabled="true"
@@ -56,6 +54,14 @@
             android:name="com.crashlytics.ApiKey"
             android:value="cf760ececcb6d74c66781b3e21ae115aaae3ffd3"/>
 
+        <activity
+            android:name=".SensorActivity"
+            android:label="@string/title_activity_sensor"
+            android:parentActivityName=".MainActivity">
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value="io.trygvis.soilmoisture.MainActivity"/>
+        </activity>
     </application>
 
 </manifest>
diff --git a/app/src/main/java/io/trygvis/android/bt/BtDevice.java b/app/src/main/java/io/trygvis/android/bt/BtDevice.java
index fd9e2b9..b90ac4f 100644
--- a/app/src/main/java/io/trygvis/android/bt/BtDevice.java
+++ b/app/src/main/java/io/trygvis/android/bt/BtDevice.java
@@ -15,14 +15,13 @@ import static io.trygvis.android.bt.BtPromise.PromiseResult.detour;
 import static io.trygvis.android.bt.BtPromise.PromiseResult.fail;
 import static io.trygvis.android.bt.BtPromise.PromiseResult.waitForNextEvent;
 
-public class BtDevice<A> {
+public class BtDevice<A> implements Comparable<BtDevice> {
     private final static String TAG = BtDevice.class.getSimpleName();
 
     private final DefaultBtService btService;
     private final BluetoothDevice bluetoothDevice;
     private BluetoothGatt gatt;
     private Integer rssi;
-    private BtScanResult scanResult;
     private A tag;
     private final String address;
 
@@ -30,6 +29,10 @@ public class BtDevice<A> {
     private final boolean seenBefore;
     private final Date firstSeen;
     private Date lastSeen;
+    /**
+     * If seen in last scan.
+     */
+    private boolean recentlySeen;
     private boolean connected;
     private final WrappingBluetoothGattCallback wrappingCallback = new WrappingBluetoothGattCallback();
 
@@ -37,15 +40,15 @@ public class BtDevice<A> {
 
     BtDevice(DefaultBtService btService, BluetoothDevice bluetoothDevice, SQLiteDatabase db,
              BtService.BtDbIntegration<A> btDbIntegration, long id, Integer rssi,
-             BtScanResult scanResult, boolean seenBefore, Date firstSeen, Date lastSeen) {
+             boolean seenBefore, Date firstSeen, Date lastSeen, boolean recentlySeen) {
         this.btService = btService;
         this.bluetoothDevice = bluetoothDevice;
         this.id = id;
         this.rssi = rssi;
-        this.scanResult = scanResult;
         this.seenBefore = seenBefore;
         this.firstSeen = firstSeen;
         this.lastSeen = lastSeen;
+        this.recentlySeen = recentlySeen;
 
         this.tag = btDbIntegration.createTag(db, this);
         this.address = bluetoothDevice.getAddress();
@@ -60,7 +63,7 @@ public class BtDevice<A> {
     }
 
     public String getAddress() {
-        return bluetoothDevice.getAddress();
+        return address;
     }
 
     public String getName() {
@@ -71,10 +74,6 @@ public class BtDevice<A> {
         return rssi;
     }
 
-    public BtScanResult getScanResult() {
-        return scanResult;
-    }
-
     public boolean isSeenBefore() {
         return seenBefore;
     }
@@ -91,6 +90,14 @@ public class BtDevice<A> {
         this.lastSeen = lastSeen;
     }
 
+    public boolean isRecentlySeen() {
+        return recentlySeen;
+    }
+
+    public void setRecentlySeen(boolean recentlySeen) {
+        this.recentlySeen = recentlySeen;
+    }
+
     /**
      * The first handler must handle a onDirect().
      * <p>
@@ -101,7 +108,7 @@ public class BtDevice<A> {
             throw new RuntimeException("The current callback is not done.");
         }
 
-        Log.i(TAG, "withConnection(), address=" + bluetoothDevice.getAddress() + ", connected: " + (gatt != null));
+        Log.i(TAG, "withConnection(), address=" + address + ", connected: " + (gatt != null));
 
         BtPromise newPromise;
         if (gatt == null) {
@@ -160,7 +167,7 @@ public class BtDevice<A> {
 
     @Override
     public String toString() {
-        return "BtDevice{address=" + bluetoothDevice.getAddress() + '}';
+        return "BtDevice{address=" + address + '}';
     }
 
     @Override
@@ -174,12 +181,17 @@ public class BtDevice<A> {
 
         BtDevice other = (BtDevice) o;
 
-        return getAddress().equals(other.getAddress());
+        return address.equals(other.getAddress());
     }
 
     @Override
     public int hashCode() {
-        return getAddress().hashCode();
+        return address.hashCode();
+    }
+
+    @Override
+    public int compareTo(BtDevice that) {
+        return address.compareTo(that.address);
     }
 
     private class WrappingBluetoothGattCallback extends BluetoothGattCallback {
@@ -196,6 +208,11 @@ public class BtDevice<A> {
             BtDevice.this.connected = status == BluetoothGatt.GATT_SUCCESS &&
                     newState == BluetoothGatt.STATE_CONNECTED;
 
+            if (oldConnected && BtDevice.this.connected) {
+                Log.i(TAG, "Wrapping: Extra 'onConnectionStateChange' event, ignoring. gatt=" + gatt);
+                return;
+            }
+
             try {
                 if (callback != null) {
                     callback.onConnectionStateChange(gatt, status, newState);
@@ -203,14 +220,14 @@ public class BtDevice<A> {
             } finally {
                 if (!BtDevice.this.connected) {
                     if (oldConnected) {
-                        Log.i(TAG, "Wrapper: Lost connection, removing gatt. gatt=" + gatt);
+                        Log.i(TAG, "Wrapping: Lost connection, removing gatt. gatt=" + gatt);
                     } else {
-                        Log.i(TAG, "Wrapper: Lost connection, was not connected. gatt=" + gatt);
+                        Log.i(TAG, "Wrapping: Lost connection, was not connected. gatt=" + gatt);
                     }
 
                     BtDevice.this.gatt = null;
                 } else {
-                    Log.i(TAG, "Wrapper: connected");
+                    Log.i(TAG, "Wrapping: connected");
                 }
             }
         }
diff --git a/app/src/main/java/io/trygvis/android/bt/BtPromise.java b/app/src/main/java/io/trygvis/android/bt/BtPromise.java
index 50aad13..bffdd19 100644
--- a/app/src/main/java/io/trygvis/android/bt/BtPromise.java
+++ b/app/src/main/java/io/trygvis/android/bt/BtPromise.java
@@ -371,17 +371,11 @@ public class BtPromise {
 
                 if (result instanceof Detour) {
                     BtPromise detour = ((Detour) result).promise;
-                    Log.i(TAG, "Adding detour with " + detour.actionQ.size() + " actions.");
+//                    Log.i(TAG, "Adding detour with " + detour.actionQ.size() + " actions.");
                     events.add("detour, action size=" + detour.actionQ.size() + ", " +
 //                            "failure size=" + detour.failureQ.size() + ", " +
                             "finally size=" + detour.finallyQ.size());
 
-                    Log.i(TAG, "hasNext(): " + hasNext());
-                    Log.i(TAG, "currentAction: " + currentAction);
-                    if (hasNext()) {
-                        Log.i(TAG, "next action: " + actionQ.get(currentAction).name);
-                    }
-
                     // The new promise should probably be stacked on top, so that all of its
                     // finally handlers are executed after the added set concludes and then the
                     // current stack can continue.
@@ -389,10 +383,6 @@ public class BtPromise {
                     actionQ.addAll(currentAction, detour.actionQ);
 //                    failureQ.addAll(detour.failureQ);B
                     finallyQ.addAll(detour.finallyQ);
-                    Log.i(TAG, "hasNext(): " + hasNext());
-                    if (hasNext()) {
-                        Log.i(TAG, "next action: " + actionQ.get(currentAction).name);
-                    }
 
                     result = PromiseResult.continueDirectly();
                 }
diff --git a/app/src/main/java/io/trygvis/android/bt/BtScanResult.java b/app/src/main/java/io/trygvis/android/bt/BtScanResult.java
deleted file mode 100644
index c443afa..0000000
--- a/app/src/main/java/io/trygvis/android/bt/BtScanResult.java
+++ /dev/null
@@ -1,9 +0,0 @@
-package io.trygvis.android.bt;
-
-public class BtScanResult {
-    private final byte[] scanRecord;
-
-    public BtScanResult(byte[] scanRecord) {
-        this.scanRecord = scanRecord;
-    }
-}
diff --git a/app/src/main/java/io/trygvis/android/bt/BtService.java b/app/src/main/java/io/trygvis/android/bt/BtService.java
index 06857ee..46f1a80 100644
--- a/app/src/main/java/io/trygvis/android/bt/BtService.java
+++ b/app/src/main/java/io/trygvis/android/bt/BtService.java
@@ -61,5 +61,8 @@ public interface BtService<A> {
 
         public void onDeviceConnection(String address) {
         }
+
+        public void onDevicePropertyUpdated(String address) {
+        }
     }
 }
diff --git a/app/src/main/java/io/trygvis/android/bt/DefaultBtService.java b/app/src/main/java/io/trygvis/android/bt/DefaultBtService.java
index e42e685..2487bd8 100644
--- a/app/src/main/java/io/trygvis/android/bt/DefaultBtService.java
+++ b/app/src/main/java/io/trygvis/android/bt/DefaultBtService.java
@@ -31,6 +31,7 @@ import io.trygvis.android.Function;
 import io.trygvis.android.LocalBinder;
 import io.trygvis.soilmoisture.R;
 
+import static android.bluetooth.BluetoothAdapter.LeScanCallback;
 import static java.util.Collections.unmodifiableCollection;
 
 public class DefaultBtService<A> extends Service implements BtService<A> {
@@ -54,6 +55,8 @@ public class DefaultBtService<A> extends Service implements BtService<A> {
 
     private boolean scanning = false;
 
+    private Scanner scanner = new Scanner();
+
     // -----------------------------------------------------------------------
     // BtService Implementation
     // -----------------------------------------------------------------------
@@ -111,7 +114,7 @@ public class DefaultBtService<A> extends Service implements BtService<A> {
 
         for (String address : addresses) {
             BluetoothDevice bluetoothDevice = bluetoothAdapter.getRemoteDevice(address);
-            register(bluetoothDevice, null, null);
+            register(bluetoothDevice, null, false);
         }
 
         return true;
@@ -134,8 +137,9 @@ public class DefaultBtService<A> extends Service implements BtService<A> {
             handler.postDelayed(this::stopScanning, timeoutMs);
         }
 
-        if (bluetoothAdapter.startLeScan(leScanCallback)) {
+        if (bluetoothAdapter.startLeScan(scanner)) {
             scanning = true;
+            scanner.found.clear();
             sendBroadcast(createScanStarted());
             return true;
         }
@@ -148,9 +152,22 @@ public class DefaultBtService<A> extends Service implements BtService<A> {
         Log.d(TAG, "stopScanning");
 
         // This doesn't mind being called twice.
-        bluetoothAdapter.stopLeScan(leScanCallback);
+        bluetoothAdapter.stopLeScan(scanner);
 
         scanning = false;
+        for (BtDevice<A> device : devices) {
+            boolean recentlySeen = scanner.found.contains(device);
+            Log.i(TAG, "scanner.found.contains(device)=" + recentlySeen + ", " +
+                    "address=" + device.getAddress());
+
+            boolean old = device.isRecentlySeen();
+            device.setRecentlySeen(recentlySeen);
+
+            // Only if it not seen and it wasn't previously seen
+            if (!recentlySeen && old) {
+                sendBroadcast(createDevicePropertyUpdated(device.getAddress()));
+            }
+        }
 
         sendBroadcast(createScanStopped());
     }
@@ -163,7 +180,7 @@ public class DefaultBtService<A> extends Service implements BtService<A> {
         }
 
         BluetoothDevice bluetoothDevice = bluetoothAdapter.getRemoteDevice(mac);
-        return register(bluetoothDevice, null, null);
+        return register(bluetoothDevice, null, false);
     }
 
     @Override
@@ -205,16 +222,6 @@ public class DefaultBtService<A> extends Service implements BtService<A> {
     }
 
     // -----------------------------------------------------------------------
-    // Scanning
-    // -----------------------------------------------------------------------
-
-    private BluetoothAdapter.LeScanCallback leScanCallback = (device, rssi, scanRecord) -> {
-        BtScanResult scanResult = new BtScanResult(scanRecord);
-
-        register(device, rssi, scanResult);
-    };
-
-    // -----------------------------------------------------------------------
     // Service Implementation
     // -----------------------------------------------------------------------
 
@@ -278,17 +285,19 @@ public class DefaultBtService<A> extends Service implements BtService<A> {
         return openOrCreateDatabase("bt-devices", MODE_ENABLE_WRITE_AHEAD_LOGGING, null);
     }
 
-    private BtDevice<A> register(BluetoothDevice bluetoothDevice, Integer rssi, BtScanResult scanResult) {
+    private BtDevice<A> register(BluetoothDevice bluetoothDevice, Integer rssi, boolean fromScan) {
         String address = bluetoothDevice.getAddress();
-        BtDevice<A> btDevice = findDevice(address);
+        BtDevice<A> device = findDevice(address);
 
-        if (btDevice != null) {
-            return btDevice;
+        if (device != null) {
+            device.setRecentlySeen(true);
+            sendBroadcast(createDevicePropertyUpdated(device.getAddress()));
+            return device;
         }
 
         long now = System.currentTimeMillis();
 
-        btDevice = runTx(db -> {
+        device = runTx(db -> {
             Cursor cursor = db.query(Tables.T_BT_DEVICE, new String[]{Tables.C_ID, Tables.C_FIRST_SEEN},
                     Tables.C_ADDRESS + "=?", new String[]{address}, null, null, null);
 
@@ -315,15 +324,15 @@ public class DefaultBtService<A> extends Service implements BtService<A> {
 
             Log.i(TAG, "New device: " + address + ", seenBefore=" + seenBefore);
             cursor.close();
-            return new BtDevice<>(this, bluetoothDevice, db, btDbIntegration, id, rssi, scanResult,
-                    seenBefore, firstSeen, lastSeen);
+            return new BtDevice<>(this, bluetoothDevice, db, btDbIntegration, id, rssi, seenBefore,
+                    firstSeen, lastSeen, fromScan);
         });
 
-        devices.add(btDevice);
+        devices.add(device);
 
-        sendBroadcast(createNewDevice(btDevice.getAddress()));
+        sendBroadcast(createNewDevice(device.getAddress()));
 
-        return btDevice;
+        return device;
     }
 
     Intent createScanStarted() {
@@ -348,6 +357,12 @@ public class DefaultBtService<A> extends Service implements BtService<A> {
                 putExtra("address", address);
     }
 
+    Intent createDevicePropertyUpdated(String address) {
+        return new Intent(BtServiceListenerBroadcastReceiver.INTENT_NAME).
+                putExtra("event", "devicePropertyUpdated").
+                putExtra("address", address);
+    }
+
     public static void dispatchEvent(Intent intent, BtServiceListenerBroadcastReceiver listener) {
         String event = intent.getStringExtra("event");
         Log.i(TAG, "Dispatching event " + intent.getAction() + "/" + event);
@@ -361,6 +376,9 @@ public class DefaultBtService<A> extends Service implements BtService<A> {
             case "newDevice":
                 listener.onNewDevice(intent.getStringExtra("address"));
                 break;
+            case "devicePropertyUpdated":
+                listener.onDevicePropertyUpdated(intent.getStringExtra("address"));
+                break;
             case "deviceConnection":
                 listener.onDeviceConnection(intent.getStringExtra("address"));
                 break;
@@ -377,4 +395,15 @@ public class DefaultBtService<A> extends Service implements BtService<A> {
         }
         return null;
     }
+
+    private class Scanner implements LeScanCallback {
+
+        private List<BtDevice> found = new ArrayList<>();
+
+        @Override
+        public void onLeScan(BluetoothDevice device, int rssi, byte[] scanRecord) {
+            BtDevice<A> d = register(device, rssi, true);
+            found.add(d);
+        }
+    }
 }
diff --git a/app/src/main/java/io/trygvis/soilmoisture/DefaultSoilMoistureService.java b/app/src/main/java/io/trygvis/soilmoisture/DefaultSoilMoistureService.java
index 85a6afb..3e1c93b 100644
--- a/app/src/main/java/io/trygvis/soilmoisture/DefaultSoilMoistureService.java
+++ b/app/src/main/java/io/trygvis/soilmoisture/DefaultSoilMoistureService.java
@@ -119,7 +119,8 @@ public class DefaultSoilMoistureService extends Service implements SoilMoistureS
             sendBroadcast(createNewDevice(address));
 
             boolean candidate = btDevice.getAddress().startsWith("FB:") ||
-                    btDevice.getAddress().startsWith("FD:");
+                    btDevice.getAddress().startsWith("FD:") ||
+                    btDevice.getAddress().startsWith("CE:");
 
             if (!candidate) {
                 Log.w(TAG, "Skipping device: " + btDevice.getAddress());
@@ -131,6 +132,11 @@ public class DefaultSoilMoistureService extends Service implements SoilMoistureS
                 probe(smDevice.getBtDevice().getAddress());
             }
         }
+
+        @Override
+        public void onDevicePropertyUpdated(String address) {
+            sendBroadcast(createDevicePropertyUpdated(getDevice(address)));
+        }
     };
 
     private BtPromise readAttribute(String value, byte[] req, Function<byte[], BtPromise.PromiseResult> handler) {
@@ -159,7 +165,7 @@ public class DefaultSoilMoistureService extends Service implements SoilMoistureS
             GetSensorNameRes res = parseResponse(bytes, GET_SENSOR_NAME, GetSensorNameRes.class);
             String name = res.name;
 
-            device.getSensorByIndex(index).ifPresent(sensor -> {
+            device.getSensorByNumber(index).ifPresent(sensor -> {
                 sensor.setName(name);
                 sendBroadcast(createDevicePropertyUpdated(device));
             });
@@ -198,6 +204,7 @@ public class DefaultSoilMoistureService extends Service implements SoilMoistureS
                     return continueDirectly();
                 }).
                 onFinally(success -> {
+                    Log.i(TAG, "finally, smDevice.getIsUseful()=" + smDevice.getIsUseful());
                     if (smDevice.getIsUseful() == null) {
                         smDevice.setIsUseful(false);
                     }
@@ -256,7 +263,11 @@ public class DefaultSoilMoistureService extends Service implements SoilMoistureS
                     values.put(Tables.C_INDEX, i);
                     id = db.insert(Tables.T_SM_SENSOR, null, values);
 
+                    Log.i(TAG, "Created new sensor row, id=" + id);
+
                     device.addSensor(new SmSensor(device, id, (byte) i));
+                } else {
+                    Log.i(TAG, "Using existing sensor row, id=" + id);
                 }
             }
 
diff --git a/app/src/main/java/io/trygvis/soilmoisture/MainActivity.java b/app/src/main/java/io/trygvis/soilmoisture/MainActivity.java
index e838f01..6996ef8 100644
--- a/app/src/main/java/io/trygvis/soilmoisture/MainActivity.java
+++ b/app/src/main/java/io/trygvis/soilmoisture/MainActivity.java
@@ -47,7 +47,7 @@ public class MainActivity extends ListActivity {
     private static final int REQUEST_ENABLE_BT = 1;
 
     private final BtActivitySupport btActivitySupport = new BtActivitySupport(this, REQUEST_ENABLE_BT);
-    private final SoilMoistureListener serviceListener = new MySoilMoistureListener();
+    private final SoilMoistureListener serviceListener = new MainSoilMoistureListener();
     private final MainActivity context = this;
 
     private DeviceListAdapter deviceList;
@@ -56,7 +56,10 @@ public class MainActivity extends ListActivity {
     private ProgressDialog initializing;
     private boolean ready;
 
-    @Override
+    private int red;
+    private int yellow;
+    private int green;
+
     protected void onCreate(Bundle savedInstanceState) {
         Log.i(TAG, "onCreate");
         Thread.setDefaultUncaughtExceptionHandler(EXCEPTION_HANDLER);
@@ -92,8 +95,12 @@ public class MainActivity extends ListActivity {
 
         bindService(new Intent(this, DefaultSoilMoistureService.class), serviceConnection, BIND_AUTO_CREATE);
 
-        initializing = ProgressDialog.
-                show(this, "Initializing", "Connecting to Bluetooth system.", true);
+//        initializing = ProgressDialog.
+//                show(this, "Initializing", "Connecting to Bluetooth system.", true);
+
+        green = getResources().getColor(R.color.green);
+        yellow = getResources().getColor(R.color.yellow);
+        red = getResources().getColor(R.color.red);
 
         setContentView(R.layout.main);
     }
@@ -264,36 +271,126 @@ public class MainActivity extends ListActivity {
         Log.i(TAG, "onSensorClick, device=" + sensor.getDevice().getBtDevice().getId() + "/" + sensor.getIndex());
 
         sensor.readCurrentValue();
+
+//        Intent intent = new Intent(this, SensorActivity.class);
+//        intent.putExtra(SensorActivity.EXTRA_ADDRESS, sensor.getDevice().getBtDevice().getAddress());
+//        intent.putExtra(SensorActivity.EXTRA_NUMBER, sensor.getIndex());
+//        startActivity(intent);
     }
 
     // -----------------------------------------------------------------------
     //
     // -----------------------------------------------------------------------
 
-    static class DeviceItem {
+    class DeviceItem {
+        final SmDevice device;
+        final TextView statusBar;
         final TextView deviceName;
         final TextView deviceAddress;
         final TextView rssi;
         final TextView info;
 
-        DeviceItem(View view) {
+        DeviceItem(SmDevice device, View view) {
+            this.device = device;
+            this.statusBar = (TextView) view.findViewById(R.id.status_bar);
             this.deviceName = (TextView) view.findViewById(R.id.device_name);
             this.deviceAddress = (TextView) view.findViewById(R.id.device_address);
             this.rssi = (TextView) view.findViewById(R.id.device_rssi);
             this.info = (TextView) view.findViewById(R.id.device_info);
         }
+
+        public void update() {
+            statusBar.setVisibility(deviceList.isGroupByDevice() ? View.VISIBLE : View.GONE);
+            statusBar.setBackgroundColor(statusColor(device));
+
+            if (device.getName() != null) {
+                deviceName.setText(device.getName());
+            } else {
+                deviceName.setText(R.string.unknown_device);
+            }
+            String address = device.getBtDevice().getAddress();
+
+            if (!device.isProbed()) {
+                address += " not probed";
+            } else if (device.isUseful()) {
+                address += " useful";
+            } else {
+                address += " not useful";
+            }
+
+            address += ", connected=" + device.getBtDevice().connected();
+            address += ", recentlySeen=" + device.getBtDevice().isRecentlySeen();
+
+            deviceAddress.setText(address);
+
+            String rssi = getText(R.string.rssi) + ": " +
+                    (device.getBtDevice().getRssi() != null ? valueOf(device.getBtDevice().getRssi()) : getText(R.string.unknown));
+            rssi += ", device: " + device.toString();
+            this.rssi.setText(rssi);
+
+//            boolean useful = device.isUseful();
+//
+//            if (useful) {
+//                info.setText("Number of sensors: " + device.getSensors().size());
+//            } else {
+//                info.setText("");
+//            }
+        }
     }
 
-    static class SensorItem {
+    class SensorItem {
+        final SmDevice device;
         final SmSensor sensor;
+        final TextView statusBar;
         final TextView description;
         final ProgressBar sensorProgress;
 
         SensorItem(SmSensor sensor, View view) {
             this.sensor = sensor;
+            this.statusBar = (TextView) view.findViewById(R.id.status_bar);
             this.description = (TextView) view.findViewById(R.id.description);
             this.sensorProgress = (ProgressBar) view.findViewById(R.id.sensor_progress);
             sensorProgress.setMax(1024);
+
+            device = sensor.getDevice();
+
+            view.setClickable(true);
+            view.setOnClickListener(v -> {
+                Log.i(TAG, "onClick, SmSensor: " +
+//                            "position=" + position + ", " +
+                        "sensor=" + sensor /*+ ", " +
+                            "tag=" + v.getTag()*/);
+                onSensorClick(sensor);
+            });
+        }
+
+        public void update() {
+            statusBar.setVisibility(deviceList.isGroupByDevice() ? View.GONE : View.VISIBLE);
+            statusBar.setBackgroundColor(statusColor(device));
+
+            if (deviceList.isGroupByDevice()) {
+                statusBar.setVisibility(View.GONE);
+            } else {
+                statusBar.setVisibility(View.VISIBLE);
+                statusBar.setBackgroundColor(statusColor(device));
+            }
+
+            Integer value = sensor.getLastValue();
+            String text = "Sensor " + sensor;
+            text += ", value: " + (value == null ? "Unknown" : value);
+            description.setText(text);
+
+            sensorProgress.setProgress(value != null ? value : 0);
+        }
+    }
+
+    private int statusColor(SmDevice device) {
+        if (device.getBtDevice().connected()) {
+            return green;
+        } else if (device.getBtDevice().isRecentlySeen()) {
+            return yellow;
+        } else {
+            return red;
         }
     }
 
@@ -349,6 +446,7 @@ public class MainActivity extends ListActivity {
         }
 
         public void notifyDataSetChanged() {
+            Log.i(TAG, "notifyDataSetChanged");
             dataSetObservable.notifyChanged();
         }
 
@@ -475,9 +573,9 @@ public class MainActivity extends ListActivity {
                 //noinspection unchecked
                 return getBtDeviceView((BtDevice<SmDevice>) o, view);
             } else if (o instanceof SmDevice) {
-                return getSmDeviceView(position, (SmDevice) o, view);
+                return getSmDeviceView((SmDevice) o, view);
             } else if (o instanceof SmSensor) {
-                return getSoilSensorView(position, (SmSensor) o, view);
+                return getSoilSensorView((SmSensor) o, view);
             }
 
             throw new RuntimeException("Not implemented");
@@ -486,7 +584,7 @@ public class MainActivity extends ListActivity {
         private View getBtDeviceView(BtDevice<SmDevice> device, View view) {
             if (view == null) {
                 view = inflater.inflate(R.layout.fragment_device, null);
-                view.setTag(new DeviceItem(view));
+                view.setTag(new DeviceItem(device.getTag(), view));
                 view.setOnLongClickListener(v -> MainActivity.this.onBtDeviceLongClick(device));
             }
 
@@ -507,79 +605,33 @@ public class MainActivity extends ListActivity {
             return view;
         }
 
-        private View getSmDeviceView(int position, SmDevice smDevice, View view) {
+        private View getSmDeviceView(SmDevice smDevice, View view) {
             if (view == null) {
                 view = inflater.inflate(R.layout.fragment_device, null);
-                view.setTag(new DeviceItem(view));
+                view.setTag(new DeviceItem(smDevice, view));
                 view.setOnClickListener(v -> onSmDeviceClick(smDevice));
                 view.setOnLongClickListener(v -> onSmDeviceLongClick(smDevice));
             }
 
-            DeviceItem item = (DeviceItem) view.getTag();
-
-            if (smDevice.getName() != null) {
-                item.deviceName.setText(smDevice.getName());
-            } else {
-                item.deviceName.setText(R.string.unknown_device);
-            }
-            String address = smDevice.getBtDevice().getAddress();
-
-            if (!smDevice.isProbed()) {
-                address += " not probed";
-            } else if (smDevice.isUseful()) {
-                address += " useful";
-            } else {
-                address += " not useful";
-            }
-
-            address += ", connected=" + smDevice.getBtDevice().connected();
-
-            item.deviceAddress.setText(address);
-
-            String rssi = getText(R.string.rssi) + ": " +
-                    (smDevice.getBtDevice().getRssi() != null ? valueOf(smDevice.getBtDevice().getRssi()) : getText(R.string.unknown));
-            rssi += ", device: " + smDevice.toString();
-            item.rssi.setText(rssi);
-
-            boolean useful = smDevice.isUseful();
-
-            if (useful) {
-                item.info.setText("Number of sensors: " + smDevice.getSensors().size());
-            } else {
-                item.info.setText("");
-            }
+            ((DeviceItem) view.getTag()).update();
 
             return view;
         }
 
-        private View getSoilSensorView(int position, SmSensor smSensor, View view) {
+        private View getSoilSensorView(SmSensor smSensor, View view) {
             if (view == null) {
-                view = inflater.inflate(R.layout.fragment_sensor, null);
-                view.setTag(new SensorItem(smSensor, view));
-                view.setClickable(true);
-                view.setOnClickListener(v -> {
-                    Log.i(TAG, "onClick, SmSensor: " +
-//                            "position=" + position + ", " +
-                            "sensor=" + smSensor /*+ ", " +
-                            "tag=" + v.getTag()*/);
-                    onSensorClick(smSensor);
-                });
+                view = inflater.inflate(R.layout.fragment_main_sensor, null);
+                SensorItem item = new SensorItem(smSensor, view);
+                view.setTag(item);
             }
 
-            SensorItem item = (SensorItem) view.getTag();
-
-            Integer value = smSensor.getLastValue();
-            String text = "Sensor " + smSensor;
-            text += ", value: " + (value == null ? "Unknown" : value);
-            item.description.setText(text);
-
-            item.sensorProgress.setProgress(value != null ? value : 0);
+            ((SensorItem) view.getTag()).update();
 
             return view;
         }
     }
 
-    private class MySoilMoistureListener extends SoilMoistureListener {
+    private class MainSoilMoistureListener extends SoilMoistureListener {
         @Override
         public void onToast(int id, int length) {
             CharSequence text = getText(id);
@@ -605,7 +657,9 @@ public class MainActivity extends ListActivity {
                 deviceList.notifyDataSetChanged();
                 startScan();
 
-                initializing.dismiss();
+                if (initializing != null) {
+                    initializing.dismiss();
+                }
             }
         }
 
@@ -630,5 +684,10 @@ public class MainActivity extends ListActivity {
         public void onNewSample(String address, int sensor) {
             deviceList.notifyDataSetChanged();
         }
+
+        @Override
+        public void onDevicePropertyUpdated(String address) {
+            deviceList.notifyDataSetChanged();
+        }
     }
 }
diff --git a/app/src/main/java/io/trygvis/soilmoisture/SensorActivity.java b/app/src/main/java/io/trygvis/soilmoisture/SensorActivity.java
new file mode 100644
index 0000000..358382c
--- /dev/null
+++ b/app/src/main/java/io/trygvis/soilmoisture/SensorActivity.java
@@ -0,0 +1,134 @@
+package io.trygvis.soilmoisture;
+
+import android.app.ActionBar;
+import android.app.Activity;
+import android.app.Fragment;
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.ServiceConnection;
+import android.os.Bundle;
+import android.os.IBinder;
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Toast;
+
+import io.trygvis.android.LocalBinder;
+import io.trygvis.android.Optional;
+
+import static io.trygvis.soilmoisture.SoilMoistureService.SoilMoistureListener;
+
+public class SensorActivity extends Activity {
+    private final static String TAG = SensorActivity.class.getSimpleName();
+
+    public static final String EXTRA_ADDRESS = "address";
+    public static final String EXTRA_NUMBER = "number";
+
+    private final Context context = this;
+    private String address;
+    private int number;
+
+    private ServiceConnection serviceConnection;
+    private SoilMoistureService soilMoistureService;
+    private SensorSoilMoistureListener serviceListener = new SensorSoilMoistureListener();
+    private SmDevice device;
+    private SmSensor sensor;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_sensor);
+        if (savedInstanceState == null) {
+            getFragmentManager().beginTransaction()
+                    .add(R.id.container, new PlaceholderFragment())
+                    .commit();
+        }
+
+        address = getIntent().getStringExtra(EXTRA_ADDRESS);
+        number = getIntent().getIntExtra(EXTRA_NUMBER, -1);
+
+        ActionBar actionBar = getActionBar();
+
+        if (actionBar != null) {
+            actionBar.setTitle(number + ": " + address);
+        }
+
+        serviceConnection = new ServiceConnection() {
+            @SuppressWarnings("unchecked")
+            @Override
+            public void onServiceConnected(ComponentName componentName, IBinder service) {
+                Log.i(TAG, "onServiceConnected");
+                soilMoistureService = ((LocalBinder<SoilMoistureService>) service).getService();
+                registerReceiver(serviceListener, SoilMoistureListener.INTENT_FILTER);
+
+                device = soilMoistureService.getDevice(address);
+                Optional<SmSensor> o = device.getSensorByNumber(number);
+
+                if (!o.isPresent()) {
+                    Toast.makeText(context, "Could not find sensor #" + number + " on device " + address,
+                            Toast.LENGTH_LONG).show();
+                    finish();
+                }
+                sensor = o.get();
+
+                runOnUiThread(SensorActivity.this::initializeView);
+            }
+
+            @Override
+            public void onServiceDisconnected(ComponentName componentName) {
+                Log.i(TAG, "onServiceDisconnected");
+                soilMoistureService = null;
+            }
+        };
+    }
+
+    public void initializeView() {
+        // current value, last updated
+        // sync to cloud
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        getMenuInflater().inflate(R.menu.menu_sensor, menu);
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        // Handle action bar item clicks here. The action bar will
+        // automatically handle clicks on the Home/Up button, so long
+        // as you specify a parent activity in AndroidManifest.xml.
+        int id = item.getItemId();
+
+        //noinspection SimplifiableIfStatement
+        if (id == R.id.action_settings) {
+            return true;
+        }
+
+        return super.onOptionsItemSelected(item);
+    }
+
+    /**
+     * A placeholder fragment containing a simple view.
+     */
+    public static class PlaceholderFragment extends Fragment {
+
+        public PlaceholderFragment() {
+        }
+
+        @Override
+        public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                                 Bundle savedInstanceState) {
+            View rootView = inflater.inflate(R.layout.fragment_sensor, container, false);
+            return rootView;
+        }
+    }
+
+
+
+    private class SensorSoilMoistureListener extends SoilMoistureListener {
+    }
+}
diff --git a/app/src/main/java/io/trygvis/soilmoisture/SmDevice.java b/app/src/main/java/io/trygvis/soilmoisture/SmDevice.java
index bf2b5f3..808cbb6 100644
--- a/app/src/main/java/io/trygvis/soilmoisture/SmDevice.java
+++ b/app/src/main/java/io/trygvis/soilmoisture/SmDevice.java
@@ -80,7 +80,7 @@ class SmDevice {
         return sensors;
     }
 
-    public Optional<SmSensor> getSensorByIndex(int index) {
+    public Optional<SmSensor> getSensorByNumber(int index) {
         if (!isUseful()) {
             throw new IllegalStateException("Not a useful device");
         }
@@ -95,7 +95,7 @@ class SmDevice {
     }
 
     void addSensor(SmSensor sensor) {
-        if (getSensorByIndex(sensor.index).isPresent()) {
+        if (getSensorByNumber(sensor.index).isPresent()) {
             throw new IllegalStateException("This device already contains a sensor with index=" + sensor.index);
         }
 
diff --git a/app/src/main/res/layout/activity_sensor.xml b/app/src/main/res/layout/activity_sensor.xml
new file mode 100644
index 0000000..c91e018
--- /dev/null
+++ b/app/src/main/res/layout/activity_sensor.xml
@@ -0,0 +1,7 @@
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+             xmlns:tools="http://schemas.android.com/tools"
+             android:id="@+id/container"
+             android:layout_width="match_parent"
+             android:layout_height="match_parent"
+             tools:context="io.trygvis.soilmoisture.SensorActivity"
+             tools:ignore="MergeRootFrame"/>
diff --git a/app/src/main/res/layout/fragment_device.xml b/app/src/main/res/layout/fragment_device.xml
index e6a2f25..097ba34 100644
--- a/app/src/main/res/layout/fragment_device.xml
+++ b/app/src/main/res/layout/fragment_device.xml
@@ -6,12 +6,19 @@
     android:clickable="true">
 
     <TextView
+        android:layout_width="match_parent"
+        android:layout_height="10sp"
+        android:id="@+id/status_bar"
+        android:layout_alignParentEnd="true"
+        android:layout_marginTop="0dp"
+        android:background="@color/red"/>
+
+    <TextView
         android:id="@+id/device_name"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:textSize="24sp"
-        android:layout_alignParentTop="true"
-        android:layout_marginTop="0dp"/>
+        android:layout_below="@+id/status_bar"/>
 
     <TextView
         android:id="@+id/device_address"
diff --git a/app/src/main/res/layout/fragment_main_sensor.xml b/app/src/main/res/layout/fragment_main_sensor.xml
new file mode 100644
index 0000000..157dcc2
--- /dev/null
+++ b/app/src/main/res/layout/fragment_main_sensor.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical"
+    android:layout_height="wrap_content"
+    android:layout_width="wrap_content">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="10dp"
+        android:id="@+id/status_bar"
+        android:layout_alignParentEnd="true"
+        android:layout_marginTop="0dp"
+        android:background="@color/red"/>
+
+    <TextView
+        android:id="@+id/description"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_below="@+id/status_bar"/>
+
+    <ProgressBar
+        style="?android:attr/progressBarStyleHorizontal"
+        android:id="@+id/sensor_progress"
+        android:layout_width="fill_parent"
+        android:layout_height="20dp"
+        android:layout_below="@id/description"/>
+
+</RelativeLayout>
diff --git a/app/src/main/res/layout/fragment_sensor.xml b/app/src/main/res/layout/fragment_sensor.xml
index 82d0d77..4d911ca 100644
--- a/app/src/main/res/layout/fragment_sensor.xml
+++ b/app/src/main/res/layout/fragment_sensor.xml
@@ -1,21 +1,25 @@
-<?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    android:orientation="vertical"
-    android:layout_height="wrap_content"
-    android:layout_width="wrap_content">
+                xmlns:tools="http://schemas.android.com/tools"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:paddingLeft="@dimen/activity_horizontal_margin"
+                android:paddingRight="@dimen/activity_horizontal_margin"
+                android:paddingTop="@dimen/activity_vertical_margin"
+                android:paddingBottom="@dimen/activity_vertical_margin"
+                tools:context="io.trygvis.soilmoisture.SensorActivity$PlaceholderFragment">
 
     <TextView
-        android:id="@+id/description"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_alignParentTop="true"
-        android:layout_marginTop="0dp"/>
+        android:text="@string/hello_world"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"/>
 
-    <ProgressBar
-        style="?android:attr/progressBarStyleHorizontal"
-        android:id="@+id/sensor_progress"
-        android:layout_width="fill_parent"
-        android:layout_height="20dp"
-        android:layout_below="@id/description"/>
+    <Button
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/refresh"
+        android:id="@+id/button"
+        android:layout_alignParentBottom="true"
+        android:layout_alignParentStart="true"
+        android:layout_alignParentEnd="true"/>
 
 </RelativeLayout>
diff --git a/app/src/main/res/menu/menu_sensor.xml b/app/src/main/res/menu/menu_sensor.xml
new file mode 100644
index 0000000..1b2de78
--- /dev/null
+++ b/app/src/main/res/menu/menu_sensor.xml
@@ -0,0 +1,8 @@
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+      xmlns:tools="http://schemas.android.com/tools"
+      tools:context="io.trygvis.soilmoisture.SensorActivity">
+    <item android:id="@+id/action_settings"
+          android:title="@string/action_settings"
+          android:orderInCategory="100"
+          android:showAsAction="never"/>
+</menu>
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
new file mode 100644
index 0000000..1df95ce
--- /dev/null
+++ b/app/src/main/res/values/colors.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="red">#ff0000</color>
+    <color name="yellow">#ffff00</color>
+    <color name="green">#00ff00</color>
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 26f42fe..d1934f0 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -37,5 +37,6 @@
     <string name="yes">Yes</string>
     <string name="no">No</string>
     <string name="error_could_not_read_value">Could not read value</string>
+    <string name="title_activity_sensor">Sensor</string>
 
 </resources>