How to return Android's Alert return value to WebView with JavascriptInterface?

Question

I have created a Android WebView App for my browsergame. I use a Javascript-Alert to ask the user if he really wants to reset the score. But I want to use the Android Alert instead of the Javascript Alert. So I have created a Javascript Interface.

public class AlertJSInterface {
private Context context;

AlertJSInterface(Context c) {
    context = c;
}

@JavascriptInterface
public boolean alert(String title, String message) {
    AlertDialog.Builder alert = new AlertDialog.Builder(context);
    alert.setTitle(title);
    alert.setMessage(message);
    alert.setCancelable(true);
    alert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {

        }
    });
    alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int id) {
            dialog.cancel();
        }
    });
    alert.show();

    //want to return true if clicked ok
}

Now i need the return value of the Android Alert inside Javascript. The problem is that the Android Alert has a ClickListener. But how can I get the value an return it to Javascript?

if(AndroidAlert.alert(resetScoreTitle, resetScoreAck) === true) {
    resetAll();
}

Randyka Yudhistira · Accepted Answer · 2018-06-07 10:59:39Z

1

What if you call js function after user click the "OK" button. It's like :

alert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
       myWebView.loadUrl("javascript:resetAll();");
    }
});

answered Jun 7, 2018 at 10:59

Randyka Yudhistira

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4 Comments

Pezcraft Over a year ago

How can I get access to the webview? My Webview is decleared in my MainActivity.

Randyka Yudhistira Over a year ago

err,,setter and getter? pass it with constructor? make it static? anything you like

Pezcraft Over a year ago

I tried with static and constructor...

java.lang.RuntimeException: java.lang.Throwable: A WebView method was called on thread 'JavaBridge'. All WebView methods must be called on the same thread. (Expected Looper Looper (main, tid 2) {80fa4a0} called on Looper (JavaBridge, tid 351) {1f7547f}, FYI main Looper is Looper (main, tid 2) {80fa4a0})

Pezcraft Over a year ago

ok I solved my exception with this thread

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