How to run cordova plugin in Android background service?

Question

I am working on mobile application developed on cordova . I want to implement a background service that do some work like open socket connection syncronise local database wi

Answer 1

WebViews can not execute javascript from a background service.

I would recommend using native code instead. But if you must use javascript, i would try this library

https://code.google.com/p/jav8/

ScriptEngineManager factory = new ScriptEngineManager();
ScriptEngine engine = factory.getEngineByName("jav8");

  try {
    engine.eval("print('Hello, world!')");
  } catch (ScriptException ex) {
      ex.printStackTrace();
  } 

First load the contens of your script into a string and then run engine.eval() method.

Example (Run "test.js" from assets):

AssetManager am = context.getAssets();
InputStream is = am.open("test.js");
BufferedReader r = new BufferedReader(new InputStreamReader(is));
StringBuilder total = new StringBuilder();
String line;
while ((line = r.readLine()) != null) {
    total.append(line);
}

ScriptEngineManager factory = new ScriptEngineManager();
ScriptEngine engine = factory.getEngineByName("jav8");

  try {
    engine.eval(total.toString());
  } catch (ScriptException ex) {
      ex.printStackTrace();
  }

Notice! The eval function expects only a javascript function to be executed at a time and returns the value of this function.