从java代码（cordovaActivity）android调用javascript函数

嗨，我是android新手，正在使用cordova开发应用程序。与此同时，我被迫在native和angularjs之间切换，好的是我能够从javascript代码调用java方法，但我无法实现相反的效果。这是我的android代码

public class CordovaApp extends CordovaActivity
{

     JavaScriptInterface javaScriptToJava = new JavaScriptInterface(this);


@Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    super.init();

    appView.getSettings().setJavaScriptEnabled(true);
    appView.addJavascriptInterface(javaScriptToJava, "javaScriptToJava");
    // Set by <content src="index.html" /> in config.xml
    loadUrl(launchUrl);
}

//on ActivityResult method
public void onActivityResult(int requestCode, int resultCode,Intent intent)       {

    if (requestCode == 0) {
        Log.d("outside","on ----------------------");
        if(resultCode == RESULT_OK) {
            //get the extras that are returned from the intent
            String contents = intent.getStringExtra("SCAN_RESULT");
            String format = intent.getStringExtra("SCAN_RESULT_FORMAT");
            Log.d("inside on activity result",contents);


        }
    }

    if(requestCode==1)
    {
        Log.d("onactivity result","got into second activity");
            int position=intent.getIntExtra("Message",0);
            Log.d("inside on activity result",""+position);
            //appView.loadUrl("javascript:alert(javaScriptToJava.startScanner())");

            //this is working-----------
            //appView.loadUrl("javascript:(function(){document.getElementById('signin').click()})()");


            //appView.loadUrl("file:///android_asset/www/index.html");
            appView.loadUrl("javascript:testFunction()");   


    }

}
}

我也尝试过webViewClient，但没有成功。我尝试过在login.html和index.html中提供脚本，但仍然没有定义它的giving testFunction。 这是我在login.html中编写的示例脚本

<ion-view style="background: #8eb4e3;" >

<ion-content has-header="false"
    padding="true">
    <div class="body" >
        <div style="margin-top: 60px;" align="center">
            <img src="img/login_logo_MyStock.png" class="loginLogo">
                </div>
        <div style="margin-top: 25px;" align="center" ng-enter="login1()"  >
        </div>
        <div style="margin-top: 50px;" align="center">
            <img src="img/Tesco.png" class="tescoLogo">
                </div>
    </div>
    <script type="text/javascript">
       alert("inside script");
       function testFunction()
       {
        alert("came to testFunction");        
       }
   </script>
 </ion-content>

</ion-view>

警报（“内部脚本”）；
函数testFunction（）
{
警报（“来到testFunction”）；
}

在这个问题上有人能帮忙吗

<ion-view style="background: #8eb4e3;" >

<ion-content has-header="false"
    padding="true">
    <div class="body" >
        <div style="margin-top: 60px;" align="center">
            <img src="img/login_logo_MyStock.png" class="loginLogo">
                </div>
        <div style="margin-top: 25px;" align="center" ng-enter="login1()"  >
        </div>
        <div style="margin-top: 50px;" align="center">
            <img src="img/Tesco.png" class="tescoLogo">
                </div>
    </div>
    <script type="text/javascript">
       alert("inside script");
       function testFunction()
       {
        alert("came to testFunction");        
       }
   </script>
 </ion-content>

</ion-view>