Bluetooth: stop pairing service correctly

If BluetoothPairingService was stopped and restarted, it would receive
a null intent, and it also would not signal correctly when it needed to
be stopped.

Since restarts can happen, check that we are still bonding when starting.

Also prevent crashes when we might be called with a null intent.

Test: initiate pairing remotely, adb am kill service, notice no crash
Bug: 36130262
Change-Id: I408811935fdb36591826f4481d103cf4799db27e

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

@@ -80,6 +80,7 @@ public final class BluetoothPairingService extends Service {
         Log.d(TAG, "Dismiss pairing for " + mDevice.getAddress() + " (" + mDevice.getName() + "), Cancelled.");
       }
       stopForeground(true);
+      stopSelf();
     }
   };
 
@@ -89,6 +90,12 @@ public final class BluetoothPairingService extends Service {
 
   @Override
   public int onStartCommand(Intent intent, int flags, int startId) {
+    if (intent == null) {
+      Log.e(TAG, "Can't start: null intent!");
+      stopSelf();
+      return START_NOT_STICKY;
+    }
+
     Resources res = getResources();
     Notification.Builder builder = new Notification.Builder(this)
         .setSmallIcon(android.R.drawable.stat_sys_data_bluetooth)
@@ -99,6 +106,12 @@ public final class BluetoothPairingService extends Service {
 
     mDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
 
+    if (mDevice.getBondState() != BluetoothDevice.BOND_BONDING) {
+      Log.w(TAG, "Device " + mDevice + " not bonding: " + mDevice.getBondState());
+      stopSelf();
+      return START_NOT_STICKY;
+    }
+
     String name = intent.getStringExtra(BluetoothDevice.EXTRA_NAME);
     if (TextUtils.isEmpty(name)) {
       BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
@@ -119,7 +132,7 @@ public final class BluetoothPairingService extends Service {
     registerReceiver(mCancelReceiver, filter);
 
     startForeground(NOTIFICATION_ID, builder.getNotification());
-    return START_STICKY;
+    return START_REDELIVER_INTENT;
   }
 
   @Override