Add Android KitKat support

README.md

@@ -9,7 +9,7 @@ by Sebastián Katzer ([github.com/katzer](https://github.com/katzer))
 - **iOS** *(Print from iOS devices to AirPrint compatible printers)*<br>
 See [Drawing and Printing Guide for iOS](http://developer.apple.com/library/ios/documentation/2ddrawing/conceptual/drawingprintingios/Printing/Printing.html) for detailed informations and screenshots.
 
-- **Android** *(<= 4.3, Print through 3rd party printing apps)*
+- **Android** *(Print through 3rd party printing apps on SDK <= 18)*
 
 ## Adding the Plugin to your project
 Through the [Command-line Interface](http://cordova.apache.org/docs/en/3.0.0/guide_cli_index.md.html#The%20Command-line%20Interface):
@@ -28,6 +28,8 @@ cordova plugin rm de.appplant.cordova.plugin.printer
 #### Version 0.5.0 (not yet released)
 - Release under the Apache 2.0 license.
 - [***change:***] Removed the `callback` property from the `print` interface.
+- [enhancement:] Added Android KitKat support<br>
+  *Based on the Print Android plugin made by* ***Eion Robb***
 
 #### Version 0.4.0 (24.08.2013)
 - [feature]: Added Android support<br>
@@ -75,7 +77,7 @@ window.plugin.printer.print(page);
 
 ## Platform specifics
 
-### Get all available printing apps on Android
+### Get all available printing apps on Android <= 4.3
 The callback function will be called with a second argument which is an array, indicating which printer apps are available for printing.
 ```javascript
 window.plugin.printer.isServiceAvailable(
@@ -85,7 +87,7 @@ window.plugin.printer.isServiceAvailable(
 );
 ```
 
-### Specify printing app on Android
+### Specify printing app on Android <= 4.3
 An App-ID can be assigned as a platform configuration to indicate which 3rd party printing app shall be used. Otherwise the first found application will be used.
 ```javascript
 window.plugin.printer.print(page, { appId: 'epson.print' });

plugin.xml

@@ -17,6 +17,8 @@
         <engine name="cordova" version=">=3.0.0" />
     </engines>
 
+    <dependency id="org.apache.cordova.device" url="https://github.com/apache/cordova-plugin-device" />
+
     <!-- interface -->
     <js-module src="www/printer.js" name="Printer">
         <clobbers target="plugin.printer" />

src/android/KitKatPrinter.java

@@ -21,19 +21,37 @@
 
 package de.appplant.cordova.plugin.printer;
 
+import org.apache.cordova.CallbackContext;
+import org.apache.cordova.CordovaPlugin;
+import org.apache.cordova.PluginResult;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.os.Build;
+import android.print.PrintAttributes;
+import android.print.PrintDocumentAdapter;
+import android.print.PrintManager;
+import android.view.View;
+import android.webkit.WebView;
+import android.webkit.WebViewClient;
+
+@TargetApi(19)
 public class KitKatPrinter extends CordovaPlugin {
 
     @Override
     public boolean execute (String action, JSONArray args, CallbackContext callbackContext) throws JSONException {
         // Es soll überprüft werden, ob ein Dienst zum Ausdrucken von Inhalten zur Verfügung steht
-        if ("isServiceAvailable".equals(action)) {
+        if (action.equalsIgnoreCase("isServiceAvailable")) {
             isServiceAvailable(callbackContext);
 
             return true;
         }
 
         // Etwas soll ausgedruckt werden
-        if ("print".equals(action)) {
+        if (action.equalsIgnoreCase("print")) {
             print(args, callbackContext);
 
             return true;
@@ -47,7 +65,7 @@ public class KitKatPrinter extends CordovaPlugin {
      * Überprüft, ob ein Drucker zur Verfügung steht.
      */
     private void isServiceAvailable (CallbackContext ctx) {
-        Boolean supported   = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;;
+        Boolean supported   = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
         PluginResult result = new PluginResult(PluginResult.Status.OK, supported);
 
         ctx.sendPluginResult(result);
@@ -57,6 +75,68 @@ public class KitKatPrinter extends CordovaPlugin {
      * Druckt den HTML Content aus.
      */
     private void print (final JSONArray args, CallbackContext ctx) {
+        final KitKatPrinter self = this;
 
+        cordova.getActivity().runOnUiThread( new Runnable() {
+            public void run() {
+                String content     = args.optString(0, "<html></html>");
+                WebView controller = self.getPrintController();
+
+                self.loadContentIntoPrintController(content, controller);
+
+                self.startPrinterApp(controller);
+            }
+        });
+    }
+
+    /**
+     * Erstellt den Print-View.
+     */
+    private WebView getPrintController () {
+        WebView webview = new WebView(cordova.getActivity());
+
+        webview.setVisibility(View.INVISIBLE);
+        webview.getSettings().setJavaScriptEnabled(false);
+
+        return webview;
+    }
+
+    /**
+     * Lädt den zu druckenden Content in ein WebView, welcher vom Drucker ausgedruckt werden soll.
+     */
+    private void loadContentIntoPrintController (String content, WebView webview) {
+        //Set base URI to the assets/www folder
+        String baseURL = webView.getUrl();
+        baseURL        = baseURL.substring(0, baseURL.lastIndexOf('/') + 1);
+
+        webview.loadDataWithBaseURL(baseURL, content, "text/html", "UTF-8", null);
+    }
+
+    /**
+     * Öffnet die Printer App, damit der Content ausgedruckt werden kann.
+     */
+    private void startPrinterApp (WebView webview) {
+        webview.setWebViewClient (new WebViewClient() {
+            public boolean shouldOverrideUrlLoading (WebView view, String url) {
+                return false;
+            }
+
+            public void onPageFinished (WebView webview, String url) {
+                // Get a PrintManager instance
+                PrintManager printManager = (PrintManager) cordova.getActivity()
+                    .getSystemService(Context.PRINT_SERVICE);
+
+                // Get a print adapter instance
+                PrintDocumentAdapter printAdapter = webView.createPrintDocumentAdapter();
+
+                // Get a print builder instance
+                PrintAttributes.Builder builder = new PrintAttributes.Builder();
+
+                builder.setMinMargins(PrintAttributes.Margins.NO_MARGINS);
+
+                // Create a print job with name and adapter instance
+                printManager.print("Print Document", printAdapter, builder.build());
+            }
+        });
     }
 }

www/printer.js

@@ -39,7 +39,11 @@ Printer.prototype = {
             callback.apply(scope || window, args);
         };
 
-        cordova.exec(callbackFn, null, 'Printer', 'isServiceAvailable', []);
+        if (device.platform == 'Android' && device.version >= '4.4') {
+            cordova.exec(callbackFn, null, 'KitKatPrinter', 'isServiceAvailable', []);
+        } else {
+            cordova.exec(callbackFn, null, 'Printer', 'isServiceAvailable', []);
+        };
     },
 
     /**
@@ -57,7 +61,11 @@ Printer.prototype = {
             return;
         }
 
-        cordova.exec(null, null, 'Printer', 'print', [page, options]);
+        if (device.platform == 'Android' && device.version >= '4.4') {
+            cordova.exec(null, null, 'KitKatPrinter', 'print', [page, options]);
+        } else {
+            cordova.exec(null, null, 'Printer', 'print', [page, options]);
+        };
     }
 };