Implement the changes in getting serial (Api_level 26)

Author: SebLevDev

plugin.xml

@@ -41,6 +41,10 @@
                 <param name="android-package" value="org.apache.cordova.device.Device"/>
             </feature>
         </config-file>
+		 <config-file target="AndroidManifest.xml" parent="/*">
+            <uses-permission android:name="android.permission.READ_PHONE_STATE"/>
+            <uses-permission android:name="android.permission.READ_PRIVILEGED_PHONE_STATE"/>
+        </config-file>
 
         <source-file src="src/android/Device.java" target-dir="src/org/apache/cordova/device" />
     </platform>

src/android/Device.java

@@ -129,7 +129,16 @@ public String getManufacturer() {
     }
 
     public String getSerialNumber() {
-        String serial = android.os.Build.SERIAL;
+		String serial;
+        int sdk_int = android.os.Build.VERSION.SDK_INT;
+        if (sdk_int < 26) {
+          serial = android.os.Build.SERIAL;
+        }
+        else {
+          serial = android.os.Build.getSerial();
+        }
+		
+		
         return serial;
     }