Implemented onPause, onResume.

src/android/com/cocodin/barcodescan/plugin/BarcodeScan.java

@@ -89,10 +89,27 @@ public class BarcodeScan extends CordovaPlugin {
   }
 
   @Override
+  public void onPause(boolean multiTasking) {
+    if (mDevice != null) {
+      mDevice.onPause(multiTasking);
+    }
+    super.onPause(multiTasking);
+  }
+
+  @Override
+  public void onResume(boolean multiTasking) {
+    if (mDevice != null) {
+      mDevice.onResume(multiTasking);
+    }
+    super.onResume(multiTasking);
+  }
+
+  @Override
   public void onDestroy() {
     if (mDevice != null) {
       mDevice.onDestroy();
     }
     super.onDestroy();
   }
+
 }

src/android/com/cocodin/barcodescan/plugin/BaseScan.java

@@ -21,4 +21,8 @@ public abstract class BaseScan {
 
     public abstract void onDestroy();
 
+    public abstract void onResume(boolean multitasking);
+
+    public abstract void onPause(boolean multitasking);
+
 }

src/android/com/cocodin/barcodescan/plugin/devices/C4050.java

@@ -81,5 +81,15 @@ public class C4050 extends BaseScan {
     public void onDestroy() {
 
     }
+    
+    @Override
+    public void onResume(boolean multitasking) {
+
+    }
+
+    @Override
+    public void onPause(boolean multitasking) {
+
+    }
 }
 

src/android/com/cocodin/barcodescan/plugin/devices/Camera.java

@@ -42,4 +42,14 @@ public class Camera extends BaseScan {
     public void onDestroy() {
 
     }
+
+    @Override
+    public void onResume(boolean multitasking) {
+
+    }
+
+    @Override
+    public void onPause(boolean multitasking) {
+
+    }
 }

src/android/com/cocodin/barcodescan/plugin/devices/EDA50K.java

@@ -117,6 +117,29 @@ public class EDA50K extends BaseScan implements BarcodeListener {
 
     }
 
+    @Override
+    public void onResume(boolean multitasking) {
+        super.onResume(multitasking);
+        if (barcodeReader != null) {
+            try {
+                barcodeReader.claim();
+            } catch (ScannerUnavailableException e) {
+                e.printStackTrace();
+                NotifyError("Scanner unavailable");
+            }
+        }
+    }
+
+    @Override
+    public void onPause(boolean multitasking) {
+        super.onPause(multitasking);
+        if (barcodeReader != null) {
+            // release the scanner claim so we don't get any scanner
+            // notifications while paused.
+            barcodeReader.release();
+        }
+    }
+
     private void readBarcode(CallbackContext callbackContext) {
         if (barcodeReader != null) {
             try {

src/android/com/cocodin/barcodescan/plugin/devices/NQuire300.java

@@ -52,6 +52,16 @@ public class NQuire300 extends BaseScan {
 
     }
 
+    @Override
+    public void onResume(boolean multitasking) {
+
+    }
+
+    @Override
+    public void onPause(boolean multitasking) {
+
+    }
+
     private void initMquire(Context context, final CallbackContext callbackContext) {
         Intent intent = new Intent("ACTION_BAR_SCANCFG");
         intent.putExtra("EXTRA_SCAN_MODE", 3);