Fix bugs when adding activity

mobile/src/Home/Home.js

@@ -66,11 +66,8 @@ export class Home extends React.Component {
           results[PermissionsAndroid.PERMISSIONS.ACCESS_FINE_LOCATION] ===
           PermissionsAndroid.RESULTS.GRANTED
         ) {
-          this.watchId = navigator.geolocation.watchPosition(
-            this.handlePositionChange,
-            null,
-            { distanceFilter: 10 }
-          )
+          this.setState({ haveLocationPermission: true })
+          navigator.geolocation.getCurrentPosition(this.handlePositionChange)
         }
 
         if (
@@ -250,9 +247,18 @@ export class Home extends React.Component {
       positionInfo,
       messageModal,
       haveCameraPermission,
+      haveLocationPermission,
       workItemDistance,
     } = this.state
 
+    if (!this.watchId && haveLocationPermission) {
+      this.watchId = navigator.geolocation.watchPosition(
+        this.handlePositionChange,
+        null,
+        { distanceFilter: 10 }
+      )
+    }
+
     return (
       <View
         style={{
@@ -268,7 +274,9 @@ export class Home extends React.Component {
             !(
               positionInfo &&
               positionInfo.coords.accuracy <= config.minGPSAccuracy
-            ) || !haveCameraPermission
+            ) ||
+            !haveCameraPermission ||
+            !haveLocationPermission
           }
         />
         <MapView