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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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166
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
or more contributor license agreements. See the NOTICE file
@ -17,42 +17,67 @@
KIND, either express or implied. See the License for the
specific language governing permissions and limitations
under the License.
*/
*/
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 org.json.JSONObject;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.os.Build;
import android.os.Looper;
import android.print.PrintAttributes;
import android.print.PrintDocumentAdapter;
import android.print.PrintJob;
import android.print.PrintManager;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
@TargetApi(19)
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
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
public boolean execute (String action, JSONArray args,
CallbackContext callbackContext) throws JSONException {
command = callbackContext;
if (action.equalsIgnoreCase("isAvailable")) {
isAvailable(callbackContext);
isAvailable();
return true;
}
// Etwas soll ausgedruckt werden
if (action.equalsIgnoreCase("print")) {
print(args, callbackContext);
print(args);
return true;
}
@ -62,66 +87,92 @@ 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;
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) {
final Printer self = this;
private void print (final JSONArray args) {
final String content = args.optString(0, "<html></html>");
final JSONObject props = args.optJSONObject(1);;
cordova.getActivity().runOnUiThread( new Runnable() {
@Override
public void run() {
String content = args.optString(0, "<html></html>");
WebView controller = self.getPrintController();
self.loadContentIntoPrintController(content, controller);
self.startPrinterApp(controller);
initWebView(content, props);
loadContent(content);
}
});
}
/**
* Erstellt den Print-View.
* Loads the content into the web view.
*
* @param content
* Either an HTML string or URI
*/
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) {
private void loadContent(String content) {
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.loadDataWithBaseURL(baseURL, content, "text/html", "UTF-8", null);
view.loadDataWithBaseURL(baseURL, content, "text/html", "UTF-8", null);
}
}
/**
* Öffnet die Printer App, damit der Content ausgedruckt werden kann.
* 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 startPrinterApp (WebView webview) {
webview.setWebViewClient (new WebViewClient() {
private void initWebView (String content, JSONObject props) {
Activity ctx = cordova.getActivity();
view = new WebView(ctx);
view.getSettings().setDatabaseEnabled(true);
setWebViewClient(content, props);
}
/**
* 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 setWebViewClient (final String content, JSONObject props) {
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) {
return false;
}
public void onPageFinished (WebView webview, String url) {
@Override
public void onPageFinished (WebView webView, String url) {
// Get a PrintManager instance
PrintManager printManager = (PrintManager) cordova.getActivity()
.getSystemService(Context.PRINT_SERVICE);
@ -132,10 +183,43 @@ public class Printer extends CordovaPlugin {
// Get a print builder instance
PrintAttributes.Builder builder = new PrintAttributes.Builder();
// The page does itself set its own 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
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;
}
}
}
});
}