When attempting to access API>19 on my Android device, I encountered an error in my Interface to Java that stated: "TypeError: Android.method is not a function."

Having my minimum API set to 16, everything seems to be working fine. However, debugging has become quite a challenge. I've read that after API 19, the Chrome debugger can be used. But when it comes to interfacing with Java code, I encounter the error "TypeError: Android.JavaMethod is not a function". This issue arises while using Angular for a hybrid app, which functions smoothly on iOS with the Safari debugger. The same code needs adjustments to run on Android, and I require the debugger to help me figure it out. What could possibly be causing this problem?

The error message displayed:

[INFO:CONSOLE(11594)] "TypeError: Android.JavaMethod is not a function
09-05 15:24:28.103: I/chromium(18021):     at myJavaMethod 
(file:///android_asset/my_angular/MyFile.js:217:18)
09-05 15:24:28.103: I/chromium(18021):     at Object.<anonymous> 
(file:///android_asset/my_angular/MyFile.js:901:67)
...

Contents of my JS file:

function myJavaMethod(curData)
{
  return(Android.JavaMethod(curData));   
} // --- end of myJavaMethod ---

... more code followed by its invocation from the angular controller
$scope.myCopy = myJavaMethod('arg');                
...

Content from my java file:

Weby1.setWebViewClient(new WebViewClient());
Weby1.loadUrl("file:///android_asset/my_angular_hl/index.html");

// calling interface to android
Weby1.addJavascriptInterface(new JavaScriptInterface(this), "Android");

...
public class JavaScriptInterface 
{
         Context mContext;
         JavaScriptInterface(Context c) {
             mContext = c;
         }

         public String JavaMethod(String arg)
         {
              ..stuff
              return str;
         }
         
         ...more methods
javascriptandroidangularjs

Answer №1

After delving deeper, I discovered that for API level 17 and above, it is necessary to annotate every method in the interface with @JavascriptInterface and add the import. Despite a misleading error message leading me astray, I realized that my lack of attention to this detail was causing issues. Most of my development work has been focused on AngularJS, with only occasional low-level work in Android (such as Bluetooth interactions).

import android.webkit.JavascriptInterface;
...   
@JavascriptInterface
public String JavaMethod(String arg)
{
 ...

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