[ENHANCEMENT] Add permission handling for android 6+

Example/Example.js

@@ -186,6 +186,8 @@ export default class Example extends React.Component {
           onZoomChanged={() => {}}
           defaultTouchToFocus
           mirrorImage={false}
+          permissionDialogTitle="Sample title"
+          permissionDialogMessage="Sample dialog message"
         />
         <View style={[styles.overlay, styles.topOverlay]}>
           <TouchableOpacity

README.md

@@ -322,6 +322,14 @@ from javascript.
 
 If set to `true`, the device will not sleep while the camera preview is visible. This mimics the behavior of the default camera app, which keeps the device awake while open.
 
+#### `Android` `permissionDialogTitle`
+
+Starting on android M individual permissions must be granted for certain services, the camera is one of them, you can use this change the title of the dialog prompt requesting permissions.
+
+#### `Android` `permissionDialogMessage`
+
+Starting on android M individual permissions must be granted for certain services, the camera is one of them, you can use this change the content of the dialog prompt requesting permissions.
+
 #### `mirrorImage`
 
 If set to `true`, the image returned will be mirrored.

android/src/main/java/com/lwansbrough/RCTCamera/RCTCamera.java

@@ -432,13 +432,9 @@ public class RCTCamera {
             if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT && _cameraInfos.get(RCTCameraModule.RCT_CAMERA_TYPE_FRONT) == null) {
                 _cameraInfos.put(RCTCameraModule.RCT_CAMERA_TYPE_FRONT, new CameraInfoWrapper(info));
                 _cameraTypeToIndex.put(RCTCameraModule.RCT_CAMERA_TYPE_FRONT, i);
-                acquireCameraInstance(RCTCameraModule.RCT_CAMERA_TYPE_FRONT);
-                releaseCameraInstance(RCTCameraModule.RCT_CAMERA_TYPE_FRONT);
             } else if (info.facing == Camera.CameraInfo.CAMERA_FACING_BACK && _cameraInfos.get(RCTCameraModule.RCT_CAMERA_TYPE_BACK) == null) {
                 _cameraInfos.put(RCTCameraModule.RCT_CAMERA_TYPE_BACK, new CameraInfoWrapper(info));
                 _cameraTypeToIndex.put(RCTCameraModule.RCT_CAMERA_TYPE_BACK, i);
-                acquireCameraInstance(RCTCameraModule.RCT_CAMERA_TYPE_BACK);
-                releaseCameraInstance(RCTCameraModule.RCT_CAMERA_TYPE_BACK);
             }
         }
     }

src/index.js

@@ -8,6 +8,7 @@ import {
   StyleSheet,
   requireNativeComponent,
   ViewPropTypes,
+  PermissionsAndroid,
 } from 'react-native';
 
 const CameraManager = NativeModules.CameraManager || NativeModules.CameraModule;
@@ -91,6 +92,8 @@ export default class Camera extends Component {
     playSoundOnCapture: PropTypes.bool,
     torchMode: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
     type: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
+    permissionDialogTitle: PropTypes.string,
+    permissionDialogMessage: PropTypes.string
   };
 
   static defaultProps = {
@@ -108,6 +111,8 @@ export default class Camera extends Component {
     torchMode: CameraManager.TorchMode.off,
     mirrorImage: false,
     barCodeTypes: Object.values(CameraManager.BarCodeType),
+    permissionDialogTitle: '',
+    permissionDialogMessage: ''
   };
 
   static checkDeviceAuthorizationStatus = CameraManager.checkDeviceAuthorizationStatus;
@@ -131,16 +136,31 @@ export default class Camera extends Component {
     this._addOnBarCodeReadListener();
 
     let { captureMode } = convertNativeProps({ captureMode: this.props.captureMode });
-    let hasVideoAndAudio =
-      this.props.captureAudio && captureMode === Camera.constants.CaptureMode.video;
-    let check = hasVideoAndAudio
-      ? Camera.checkDeviceAuthorizationStatus
-      : Camera.checkVideoAuthorizationStatus;
+    let hasVideoAndAudio = this.props.captureAudio && captureMode === Camera.constants.CaptureMode.video;
+      
+    if (Platform.OS === 'ios') {
+      
+      let check = hasVideoAndAudio ? Camera.checkDeviceAuthorizationStatus : Camera.checkVideoAuthorizationStatus;
 
-    if (check) {
-      const isAuthorized = await check();
-      this.setState({ isAuthorized });
+      if (check) {
+        const isAuthorized = await check();
+        this.setState({ isAuthorized });
+      }
+
+    } else if (Platform.OS === 'android') {
+      
+      const granted = await PermissionsAndroid.request( PermissionsAndroid.PERMISSIONS.CAMERA, { 
+          title: this.props.permissionDialogTitle, 
+          message:  this.props.permissionDialogMessage, 
+        }
+      );
+        
+      this.setState({ isAuthorized: granted === PermissionsAndroid.RESULTS.GRANTED });
+    } else {
+      
+      this.setState({ isAuthorized: true })
     }
+    
   }
 
   componentWillUnmount() {
@@ -181,7 +201,11 @@ export default class Camera extends Component {
     const style = [styles.base, this.props.style];
     const nativeProps = convertNativeProps(this.props);
 
-    return <RCTCamera ref={CAMERA_REF} {...nativeProps} />;
+    if(this.state.isAuthorized) {
+      return <RCTCamera ref={CAMERA_REF} {...nativeProps} />;
+    } else {
+      return null
+    }
   }
 
   _onBarCodeRead = data => {