Added front/back camera option

README.md

@@ -25,6 +25,7 @@ Arguments:
     {
         text_title: "OPTIONAL Title Text - default = 'Scan QR Code'", // Android only
         text_instructions: "OPTIONAL Instruction Text - default = 'Please point your camera at the QR code.'", // Android only
+        camera: "front" || "back" // defaults to "back"
     }
     ```
 

android/ZBarScannerActivity.java

@@ -1,6 +1,7 @@
 package org.cloudsky.cordovaPlugins;
 
 import java.io.IOException;
+import java.lang.RuntimeException;
 import org.json.JSONException;
 import org.json.JSONObject;
 
@@ -8,6 +9,7 @@ import android.app.Activity;
 import android.content.Intent;
 import android.content.res.Resources;
 import android.hardware.Camera;
+import android.hardware.Camera.CameraInfo;
 import android.hardware.Camera.PreviewCallback;
 import android.hardware.Camera.AutoFocusCallback;
 import android.os.Bundle;
@@ -47,6 +49,9 @@ implements SurfaceHolder.Callback {
     private ImageScanner scanner;
     private int surfW, surfH;
 
+    // Customisable stuff
+    String whichCamera;
+
     // For retrieving R.* resources, from the actual app package
     // (we can't use actual.application.package.R.* in our code as we
     // don't know the applciation package name when writing this plugin).
@@ -75,6 +80,7 @@ implements SurfaceHolder.Callback {
         catch (JSONException e) { params = new JSONObject(); }
         String textTitle = params.optString("text_title");
         String textInstructions = params.optString("text_instructions");
+        whichCamera = params.optString("camera");
 
         // Initiate instance variables
         autoFocusHandler = new Handler();
@@ -119,10 +125,26 @@ implements SurfaceHolder.Callback {
         super.onResume();
         
         try {
+            if(whichCamera.equals("front")) {
+                int numCams = Camera.getNumberOfCameras();
+                CameraInfo cameraInfo = new CameraInfo();
+                for(int i=0; i<numCams; i++) {
+                    Camera.getCameraInfo(i, cameraInfo);
+                    if(cameraInfo.facing == CameraInfo.CAMERA_FACING_FRONT) {
+                        camera = Camera.open(i);
+                    }
+                }
+            } else {
                 camera = Camera.open();
-        } catch (Exception e){
+            }
+
+            if(camera == null) throw new Exception ("Error: No suitable camera found.");
+        } catch (RuntimeException e) {
             die("Error: Could not open the camera.");
             return;
+        } catch (Exception e) {
+            die(e.getMessage());
+            return;
         }
 
         tryStartPreview();

ios/CsZBar.m

@@ -45,6 +45,15 @@
         self.scanReader.readerDelegate = self;
         self.scanReader.supportedOrientationsMask = ZBarOrientationMaskAll;
 
+        // Get user parameters
+        NSDictionary *params = (NSDictionary*) [command argumentAtIndex:0];
+        NSString * camera = [params objectForKey:@"camera"];
+        if([camera isEqualToString:@"front"]) {
+            // We do not set any specific device for the default "back" setting,
+            // as not all devices will have a rear-facing camera.
+            self.scanReader.cameraDevice = UIImagePickerControllerCameraDeviceFront;
+        }
+
         // Hack to hide the bottom bar's Info button... http://stackoverflow.com/a/16353530
         UIView *infoButton = [[[[[self.scanReader.view.subviews objectAtIndex:1] subviews] objectAtIndex:0] subviews] objectAtIndex:3];
         [infoButton setHidden:YES];

www/zBar.js

@@ -12,6 +12,7 @@ ZBar.prototype = {
         params = params || {};
         if(params.text_title === undefined) params.text_title = "Scan QR Code";
         if(params.text_instructions === undefined) params.text_instructions = "Please point your camera at the QR code.";
+        if(params.camera != "front") params.camera = "back";
 
         exec(success, failure, 'CsZBar', 'scan', [params]);
     },