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Editorial Team
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Asked: 2026-06-17T12:37:12+00:00

Using Trigger.io’s barcode api in an application that only contains boilerplate HTML and the

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Using Trigger.io’s barcode api in an application that only contains boilerplate HTML and the following JavaScript:

forge.barcode.scan(function (value) {
    alert("You scanned: "+value);
});

I get the following error in the log:

Forge Java error: RuntimeException: Can’t create handler inside thread that has not called Looper.prepare()

Full error entry:

[INFO] D/Forge ( 1109): Returned: {“content”:{“message”:”Forge Java
error: RuntimeException: Can’t create handler inside thread that has
not called
Looper.prepare()”,”type”:”UNEXPECTED_FAILURE”,”subtype”:null,”full_error”:”java.lang.RuntimeException:
Can’t create handler inside thread that has not called
Looper.prepare()
at
android.os.Handler.(Handler.java:197)
at
android.os.Handler.(Handler.java:111)
at
android.app.Dialog.(Dialog.java:107)
at
android.app.AlertDialog.(AlertDialog.java:114)
at
android.app.AlertDialog$Builder.create(AlertDialog.java:931)
at
android.app.AlertDialog$Builder.show(AlertDialog.java:950)
at
io.trigger.forge.android.modules.barcode.API.scan(API.java:68)
at
java.lang.reflect.Method.invokeNative(Native Method)
at
java.lang.reflect.Method.invoke(Method.java:511)
at
io.trigger.forge.android.core.ForgeApp.callJavaFromJavaScript(ForgeApp.java:247)
at
io.trigger.forge.android.core.ForgeJSBridge$1.run(ForgeJSBridge.java:17)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at
java.lang.Thread.run(Thread.java:856)\n”},”callid”:”35E46BC5-1C17-4354-B09B-BE67B5FCD513″,”status”:”error”}

Update:

Below is my code:

File config.json

{
    "config_version": "2",
    "name": "Scan to Web",
    "author": "email@email.com",
    "version": "0.1",
    "platform_version": "v1.4",
    "description": "An empty app created by default",
    "modules": {
        "logging": {
            "level": "DEBUG"
        },
        "barcode": true,
        "contact": true,
        "file": true,
        "is": true,
        "media": true,
        "prefs": true,
        "request": {
            "permissions": ["http://*/*", "https://*/*"]
        },
        "tools": true,
        "reload": true
    }
}

File default.js

forge.barcode.scan(function (value) {
    alert("You scanned: "+value);
});

File index.html

<!DOCTYPE html>
<html>
    <head>
    <title>Hello World!</title>
    <link rel="stylesheet" href="css/jquery.mobile-1.1.0.min.css" />
    <script src="js/jquery-1.7.1.min.js"></script>
    <script src="js/jquery.mobile-1.1.0.min.js"></script>
    <script type="text/javascript" src="js/main.js"></script>
    <script type="text/javascript" src="js/default.js"></script>
</head>
<body>

    <p>Hello world!</p>

</body>
</html>
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1 Answer

  1. Editorial Team

    Try one of two things:

    1) Turn Reload module on in your app configuration. I know it sounds weird or stupid, but trust me, it should resolve your problem for now. I had very similar issue with Request module when Reload was off.

    2) Change “platform_version” in your src/config.json from “v1.4” to “v1.4.25”. I think last platform version is a bit broken.

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