b/2173596 Cancel Bluetooth scanning when the user leaves Bluetooth Settings.

Change-Id: Ib4dd6254c90da619e853b1be22fba3ff1365258e

src/com/android/settings/bluetooth/BluetoothSettings.java

@@ -203,6 +203,12 @@ public class BluetoothSettings extends PreferenceActivity
         }
     }
 
+    @Override
+    protected void onUserLeaveHint() {
+        super.onUserLeaveHint();
+        mLocalManager.stopScanning();
+    }
+
     private void addDevices() {
         List<CachedBluetoothDevice> cachedDevices =
                 mLocalManager.getCachedDeviceManager().getCachedDevicesCopy();

src/com/android/settings/bluetooth/CachedBluetoothDevice.java

@@ -52,7 +52,7 @@ public class CachedBluetoothDevice implements Comparable<CachedBluetoothDevice>
     private static final String TAG = "CachedBluetoothDevice";
     private static final boolean D = LocalBluetoothManager.D;
     private static final boolean V = LocalBluetoothManager.V;
-    private static final boolean DEBUG = false;
+    private static final boolean DEBUG = true; // STOPSHIP - disable before final rom
 
     private static final int CONTEXT_ITEM_CONNECT = Menu.FIRST + 1;
     private static final int CONTEXT_ITEM_DISCONNECT = Menu.FIRST + 2;

src/com/android/settings/bluetooth/LocalBluetoothManager.java

@@ -185,6 +185,12 @@ public class LocalBluetoothManager {
         }
     }
 
+    public void stopScanning() {
+        if (mAdapter.isDiscovering()) {
+            mAdapter.cancelDiscovery();
+        }
+    }
+
     public int getBluetoothState() {
 
         if (mState == BluetoothAdapter.ERROR) {