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Rewrite JAVA code

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This commit is contained in:
Sebastián Katzer 2014-09-11 23:14:47 +02:00
parent 7cae0fa4a5
commit 922870f95c
1 changed files with 124 additions and 40 deletions
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164
src/android/Printer.java
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@ -1,5 +1,5 @@
/* /*
Copyright 2013 appPlant UG Copyright 2013-2014 appPlant UG
Licensed to the Apache Software Foundation (ASF) under one Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file or more contributor license agreements. See the NOTICE file
@ -17,42 +17,67 @@
KIND, either express or implied. See the License for the KIND, either express or implied. See the License for the
specific language governing permissions and limitations specific language governing permissions and limitations
under the License. under the License.
*/ */
package de.appplant.cordova.plugin.printer; package de.appplant.cordova.plugin.printer;
import org.apache.cordova.CallbackContext; import org.apache.cordova.CallbackContext;
import org.apache.cordova.CordovaPlugin; import org.apache.cordova.CordovaPlugin;
import org.apache.cordova.PluginResult; import org.apache.cordova.PluginResult;
import org.json.JSONArray; import org.json.JSONArray;
import org.json.JSONException; import org.json.JSONException;
import org.json.JSONObject;
import android.annotation.TargetApi; import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context; import android.content.Context;
import android.os.Build; import android.os.Build;
import android.os.Looper;
import android.print.PrintAttributes; import android.print.PrintAttributes;
import android.print.PrintDocumentAdapter; import android.print.PrintDocumentAdapter;
import android.print.PrintJob;
import android.print.PrintManager; import android.print.PrintManager;
import android.view.View;
import android.webkit.WebView; import android.webkit.WebView;
import android.webkit.WebViewClient; import android.webkit.WebViewClient;
@TargetApi(19) @TargetApi(19)
public class Printer extends CordovaPlugin { public class Printer extends CordovaPlugin {
private WebView view;
private CallbackContext command;
private static final String DEFAULT_DOC_NAME = "unknown";
/**
* Executes the request.
*
* This method is called from the WebView thread.
* To do a non-trivial amount of work, use:
* cordova.getThreadPool().execute(runnable);
*
* To run on the UI thread, use:
* cordova.getActivity().runOnUiThread(runnable);
*
* @param action The action to execute.
* @param rawArgs The exec() arguments in JSON form.
* @param callbackContext The callback context used when calling back into JavaScript.
* @return Whether the action was valid.
*/
@Override @Override
public boolean execute (String action, JSONArray args, CallbackContext callbackContext) throws JSONException { public boolean execute (String action, JSONArray args,
// Es soll überprüft werden, ob ein Dienst zum Ausdrucken von Inhalten zur Verfügung steht CallbackContext callbackContext) throws JSONException {
command = callbackContext;
if (action.equalsIgnoreCase("isAvailable")) { if (action.equalsIgnoreCase("isAvailable")) {
isAvailable(callbackContext); isAvailable();
return true; return true;
} }
// Etwas soll ausgedruckt werden
if (action.equalsIgnoreCase("print")) { if (action.equalsIgnoreCase("print")) {
print(args, callbackContext); print(args);
return true; return true;
} }
@ -62,69 +87,95 @@ public class Printer extends CordovaPlugin {
} }
/** /**
* Überprüft, ob ein Drucker zur Verfügung steht. * Informs if the device is able to print documents.
* A Internet connection is required to load the cloud print dialog.
*/ */
private void isAvailable (CallbackContext ctx) { private void isAvailable () {
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); PluginResult result = new PluginResult(PluginResult.Status.OK, supported);
ctx.sendPluginResult(result); command.sendPluginResult(result);
} }
/** /**
* Druckt den HTML Content aus. * Loads the HTML content into the web view and invokes the print manager.
*
* @param args
* The exec arguments as JSON
*/ */
private void print (final JSONArray args, CallbackContext ctx) { private void print (final JSONArray args) {
final Printer self = this; final String content = args.optString(0, "<html></html>");
final JSONObject props = args.optJSONObject(1);;
cordova.getActivity().runOnUiThread( new Runnable() { cordova.getActivity().runOnUiThread( new Runnable() {
@Override
public void run() { public void run() {
String content = args.optString(0, "<html></html>"); initWebView(content, props);
WebView controller = self.getPrintController(); loadContent(content);
self.loadContentIntoPrintController(content, controller);
self.startPrinterApp(controller);
} }
}); });
} }
/** /**
* Erstellt den Print-View. * Loads the content into the web view.
*
* @param content
* Either an HTML string or URI
*/ */
private WebView getPrintController () { private void loadContent(String content) {
WebView webview = new WebView(cordova.getActivity()); if (content.startsWith("http") || content.startsWith("file:")) {
view.loadUrl(content);
} else {
//Set base URI to the assets/www folder
String baseURL = webView.getUrl();
baseURL = baseURL.substring(0, baseURL.lastIndexOf('/') + 1);
webview.setVisibility(View.INVISIBLE); view.loadDataWithBaseURL(baseURL, content, "text/html", "UTF-8", null);
webview.getSettings().setJavaScriptEnabled(false); }
return webview;
} }
/** /**
* Lädt den zu druckenden Content in ein WebView, welcher vom Drucker ausgedruckt werden soll. * Configures the WebView components which will call the Google Cloud Print
* Service.
*
* @param content
* HTML encoded string
* @param props
* The JSON object with the containing page properties
*/ */
private void loadContentIntoPrintController (String content, WebView webview) { private void initWebView (String content, JSONObject props) {
//Set base URI to the assets/www folder Activity ctx = cordova.getActivity();
String baseURL = webView.getUrl(); view = new WebView(ctx);
baseURL = baseURL.substring(0, baseURL.lastIndexOf('/') + 1);
webview.loadDataWithBaseURL(baseURL, content, "text/html", "UTF-8", null); view.getSettings().setDatabaseEnabled(true);
setWebViewClient(content, props);
} }
/** /**
* Öffnet die Printer App, damit der Content ausgedruckt werden kann. * Creates the web view client which sets the print document.
*
* @param content
* HTML encoded string
* @param props
* The JSON object with the containing page properties
*/ */
private void startPrinterApp (WebView webview) { private void setWebViewClient (final String content, JSONObject props) {
webview.setWebViewClient (new WebViewClient() { final String docName = props.optString("name", DEFAULT_DOC_NAME);
final boolean landscape = props.optBoolean("landscape", false);
final boolean graystyle = props.optBoolean("graystyle", false);
view.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading (WebView view, String url) { public boolean shouldOverrideUrlLoading (WebView view, String url) {
return false; return false;
} }
public void onPageFinished (WebView webview, String url) { @Override
public void onPageFinished (WebView webView, String url) {
// Get a PrintManager instance // Get a PrintManager instance
PrintManager printManager = (PrintManager) cordova.getActivity() PrintManager printManager = (PrintManager) cordova.getActivity()
.getSystemService(Context.PRINT_SERVICE); .getSystemService(Context.PRINT_SERVICE);
// Get a print adapter instance // Get a print adapter instance
PrintDocumentAdapter printAdapter = webView.createPrintDocumentAdapter(); PrintDocumentAdapter printAdapter = webView.createPrintDocumentAdapter();
@ -132,10 +183,43 @@ public class Printer extends CordovaPlugin {
// Get a print builder instance // Get a print builder instance
PrintAttributes.Builder builder = new PrintAttributes.Builder(); PrintAttributes.Builder builder = new PrintAttributes.Builder();
// The page does itself set its own margins
builder.setMinMargins(PrintAttributes.Margins.NO_MARGINS); builder.setMinMargins(PrintAttributes.Margins.NO_MARGINS);
builder.setColorMode(graystyle ? PrintAttributes.COLOR_MODE_MONOCHROME
: PrintAttributes.COLOR_MODE_COLOR);
builder.setMediaSize(landscape ? PrintAttributes.MediaSize.UNKNOWN_LANDSCAPE
: PrintAttributes.MediaSize.UNKNOWN_PORTRAIT);
// Create a print job with name and adapter instance // Create a print job with name and adapter instance
printManager.print("Print Document", printAdapter, builder.build()); PrintJob job = printManager.print(docName, printAdapter, builder.build());
invokeCallbackOnceCompletedOrCanceled(job);
view = null;
}
});
}
/**
* Invokes the callback once the print job is complete or was canceled.
*
* @param job
* The reference to the print job
*/
private void invokeCallbackOnceCompletedOrCanceled (final PrintJob job) {
cordova.getThreadPool().execute(new Runnable() {
@Override
public void run() {
Looper.prepare();
for (;;) {
if (job.isCancelled() || job.isCompleted() || job.isFailed()) {
command.success();
break;
}
}
} }
}); });
} }