Passing JavaScript values into Java GWT

Question

I need to return a value from JSNI GWT method like so:

    public native int connect(String macAdress) /*-{

    var result = 0;
    $wnd.bluetoothSerial.connect(macAdress, function() {
        $wnd.console.log("connect success");
        result = 1 ;
    }, function() {
        $wnd.console.log("Failed connect");
    });
    return result;
}-*/;

form some reasons it return 0 even if the connection successful. Apparently this variable keep the default value, Any ideas?

Community · Accepted Answer · 2017-05-23 12:15:47Z

3

You are calling an asychronous method and can't return a value that way.

You will need to pass an Callback into your native code:

See Pass Java Callback Function to JSNI Method?

edited May 23, 2017 at 12:15

CommunityBot

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answered Nov 26, 2015 at 19:17

Christian Kuetbach

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