Cannot switch to WebView when testing Hydrid App

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I am writing automation tests for a Hydrid App on Android. I have 2 problems:

  1. From Appium Inspector, I see an element with attribute

     resource-id: login_button

    so I click this button with

     androidDriver.findElement(By.id("login-button")).click();

    and I get this error:

     "An element could not be located with..."

    Of course if I find element with

     classname "android.widget.Button"

    then it works. I asked developer, normally, resource-id would be like

     resource-id: <APP_PACKAGE_NAME>:id/login_button

    But he said for hydrid app he doesn’t have bundleID (APP_PACKAGE_NAME). Is it correct that we don’t have bundleID for Hydrid APP? And why Appium Inspector can see

     "resource-id: login_button"

    but this element could not be found and clickable?

  2. So I also tried to switch context to WEBVIEW, with this code:

     Set<String> contextHandles = appiumDriver.getContextHandles();
 Map<String,String> hashMap= new HashMap<String,String>();
     for (String contextname : contextHandles){
 	    if (contextname.contains("NATIVE")){
 		    hashMap.put("native", contextname);
 	    } else {
 		    hashMap.put("webview", contextname);
 	    }
     }
     //webview 
     androidDriver.context(hashMap.get("webview"));

    contextHandles has 2 values: NATIVE_APP and WEBVIEW_<APP_PACKAGE_NAME>. But when I set context to webview, I get error:

     io.appium.java_client.NoSuchContextException: No such context found.

The App is built with Ionic 2 / Angular 2. This is what I see on Chrome://inspect

chrome_inspect.png759×589 105 KB

Can anyone please help? Thanks