feat: add hasLightSensor react method (android)

README.md

@@ -9,15 +9,17 @@ npm install react-native-ambient-light-sensor
 ## Usage
 
 ```js
-import { startLightSensor, stopLightSensor } from 'react-native-ambient-light-sensor';
+import { hasLightSensor, startLightSensor, stopLightSensor } from 'react-native-ambient-light-sensor';
 import { View, Text, DeviceEventEmitter } from 'react-native';
 
 // ...
 
 export default function App() {
   const [result, setResult] = React.useState<number | undefined>();
+  const [hasSensor, setHasSensor] = React.useState<boolean>();
 
   useEffect(() => {
+      hasLightSensor().then(setHasSensor);
       startLightSensor();
 
       const subscription = DeviceEventEmitter.addListener(
@@ -35,7 +37,7 @@ export default function App() {
 
   return (
     <View>
-      <Text>Light Result Value: {result}</Text>
+      <Text>Device has sensor: {hasSensor ? 'YES' : 'NO'}. Light Result Value: {result}</Text>
     </View>
   );
 }

android/src/main/java/com/reactnativeambientlightsensor/AmbientLightSensorModule.java

@@ -61,6 +61,12 @@ public final void onSensorChanged(SensorEvent sensorEvent) {
     public final void onAccuracyChanged(Sensor sensor, int accuracy) {
     }
 
+    @ReactMethod
+    public void hasLightSensor(Promise promise) {
+        boolean hasSensor = mSensorLight != null;
+        promise.resolve(hasSensor);
+    }
+
     @ReactMethod
     public void startLightSensor() {
         if (mSensorLight == null) {

lib/typescript/index.d.ts

@@ -1,2 +1,3 @@
+export declare async function hasLightSensor(): Promise<boolean>;
 export declare function startLightSensor(): void;
 export declare function stopLightSensor(): void;

src/index.tsx

@@ -15,6 +15,10 @@ const AmbientLightSensor = NativeModules.AmbientLightSensor  ? NativeModules.Amb
       }
     );
 
+export async function hasLightSensor(): Promise<boolean> {
+  return AmbientLightSensor.hasLightSensor();
+}
+
 export function startLightSensor(): void {
   return AmbientLightSensor.startLightSensor();
 }