Merge "Crash when scanning WiFi QR code"

src/com/android/settings/wifi/dpp/WifiDppQrCodeScannerFragment.java

@@ -168,10 +168,18 @@ public class WifiDppQrCodeScannerFragment extends WifiDppQrCodeBaseFragment impl
                     break;
 
                 case MESSAGE_SCAN_ZXING_WIFI_FORMAT_SUCCESS:
+                    final Context context = getContext();
+                    if (context == null) {
+                        // Context may be null if the message is received after the Activity has
+                        // been destroyed
+                        Log.d(TAG, "Scan success but context is null");
+                        return;
+                    }
+
                     // We may get 2 WifiConfiguration if the QR code has no password in it,
                     // one for open network and one for enhanced open network.
                     final WifiManager wifiManager =
-                            getContext().getSystemService(WifiManager.class);
+                            context.getSystemService(WifiManager.class);
                     final WifiNetworkConfig qrCodeWifiNetworkConfig =
                             (WifiNetworkConfig)msg.obj;
                     final List<WifiConfiguration> qrCodeWifiConfigurations =

src/com/android/settings/wifi/qrcode/QrCamera.java

@@ -124,6 +124,7 @@ public class QrCamera extends Handler {
         }
         if (mCamera != null) {
             mCamera.stopPreview();
+            releaseCamera();
         }
     }