从科尔多瓦的java方法中调用javascript函数

Question

我做了一个插件，用于在javascript和原生java代码之间进行通信。但由于某种原因，我不得不立即返回到回调函数。反过来，我在java.now中完成实现后开始了一个异步方法，我想返回到我的javascript.Please告诉我如何去做。

我的Java代码是 -

public class MyPlugin extends CordovaPlugin 
{ 
    String fileName; 
    Context context; 
    @Override 
    public void initialize(CordovaInterface cordova, CordovaWebView webView) { 
     super.initialize(cordova, webView); 
     // your init code here 
    } 

    @Override 
    public boolean execute(String action, JSONArray args, CallbackContext callbackContext) throws JSONException 
    { 
      context=this.cordova.getActivity().getApplicationContext(); 
      String myurl = args.getString(0); 
      if (action.equals("plugin1")) 
      { 

        new DownloadManager().execute(myurl); 

        callbackContext.success("Operation performed successfully!!"); 
        return true; 
      } 


      callbackContext.error("error"); 
      return false; 

    } 

    public class DownloadManager extends AsyncTask<String, String, String> { 

     @Override 
     public String doInBackground(String... arg0) { 
      downloadapk(arg0[0]); 
      installapk(); 
      System.out.println("Download Complete"); 
      return null; 
//Here I want to return to javascript.How can I callback to the javascript function from //async method?? 
     } 

    } 

Answer 1

你要通过callbackContext到DownloadManager类。

@Override 
public boolean execute(String action, JSONArray args, CallbackContext callbackContext) throws JSONException 
{ 
     context=this.cordova.getActivity().getApplicationContext(); 
     String myurl = args.getString(0); 
     if (action.equals("plugin1")) 
     { 
      // Pass callbackContext to your actual code which performing the work. 
      new DownloadManager(callbackContext).execute(myurl); 
      return true; 
     } 

     callbackContext.error("error"); 
     return false; 
} 

public class DownloadManager extends AsyncTask<String, String, String> { 
    private CallbackContext callbackContext; 
    public DownloadManager(CallbackContext callbackContext) { 
     this.callbackContext = callbackContext; 
    } 

    @Override 
    public String doInBackground(String... arg0) { 
     downloadapk(arg0[0]); 
     installapk(); 
     this.callbackContext.success(); 
     return null; 
     //Here I want to return to javascript.How can I callback to the javascript function from //async method?? 
    }