Sunmi V2S - attempt to invoke interface method on null object reference

[ryanmitchell]

Thanks for this package - it looks great.

When I try to use it (through EAS build on Expo) I'm getting:

Attempt to invoke interface method 'void com.sunmi.peripheral.printer.SunmiPrinterService.printText' on a null object reference

Am I missing something? My code is pretty basic:

import SunmiPrinter from '@heasy/react-native-sunmi-printer';

SunmiPrinter.printerText('Hello hello hello');

[Surile]

I haven't used it in Expo, I can't answer it for you, it is recommended not to use Expo

[ryanmitchell]

Its not Expo specific - I'm using EAS build which is the same as using Android studio. Its just a different build system but it has complete parity.

Have you ever tried/tested the library on a V2S? What hardware are you using?

[Surile]

I see Sunmi development documentation and there is no v2

[ryanmitchell]

See: https://www.sunmi.com/en-US/v2s/

[Surile]

@ryanmitchell See the latest document, wait a moment, I will update

[Surile]

@ryanmitchell Please try it with v2

[Surile]

@ryanmitchell Is it ready to use, I'm going to close this.

[ryanmitchell]

Struggling to get a build as I cant target the branch - it needs to be a release

[Surile]

Struggling to get a build as I cant target the branch - it needs to be a release

👌

[ryanmitchell]

I just tested against 1.6.2 and the build now fails... is not allowed in the manifest element - see: https://developer.android.com/guide/topics/manifest/manifest-element

Should it maybe be <original-package> as per: https://android.googlesource.com/platform/frameworks/base/+/master/packages/PackageInstaller/AndroidManifest.xml#5

[Surile]

@ryanmitchell You try again.

[ryanmitchell]

@Surile thanks. Unfortunately I'm back to getting the null object reference error so the change doesn't seem to have worked. Do you have any other ideas?

[Surile]

@ryanmitchell

package android:name="woyou.aidlservice.jiuiv5"

You try to put that code in AndroidManifest.xml under Android project

[ryanmitchell]

Same error as before - AndroidManifest.xml:37: AAPT: error: <manifest> tag is missing 'package' attribute - this means <package> is not valid in AndroidManifest

[Surile]

I saw the Chinese document, the document said that v2 and v2plus need to add this

[ryanmitchell]

Can you send the link to the document so I can investigate?

[Surile]

Documentation

[ryanmitchell]

Thanks, I see now, it needs added to queries. I've got it working - I'll open a PR with the config needed for expo incase anyone else needs it.

[ryanmitchell]

Thank you!

[Surile]

Thanks, I see now, it needs added to queries. I've got it working - I'll open a PR with the config needed for expo incase anyone else needs it.

Ok, thank you

[ryanmitchell]

I think the best thing might be to add something to the docs:

For Expo users, you need to add a config plugin as follows:

const { withAndroidManifest } = require("@expo/config-plugins")

module.exports = function androiManifestPlugin(config) {
  return withAndroidManifest(config, async config => {
    let androidManifest = config.modResults.manifest

    androidManifest.queries.push({
        'package': {
            '$': {
                'android:name': 'woyou.aidlservice.jiuiv5'
            }
        }
    });

    return config
  })
}

Add this to a file called android-manifest.plugin.js in your app root, then add a reference to this file your expo.plugins array in app.json... eg.

        "plugins": [
            "./android-manifest.plugin.js"
        ]

[daniel1up]

Hello guys,

I see that you have solved this issue of V2s for EAS, but what about Android build? Is there any opportunity to make it work?

Thanks

[Surile]

Hello guys,

I see that you have solved this issue of V2s for EAS, but what about Android build? Is there any opportunity to make it work?

Thanks

it should be ok

[daniel1up]

Yes, it works now. Thanks

[anastely]

Hey @ryanmitchell we are trying to use this lib with Sunmi V2s

But got this error as @MnaveedS said

Can you please share with us your Gradle files and other stuff to make this works with V2s

https://github.com/Surile/react-native-sunmi-printer/issues/22

[ryanmitchell]

I use expo, so dont have grade files to share. My comment above shows how I set it up to work.

[d-lindau]

Im having the same issue. Tried multiple versions of React-native. V2s and not using EAS or Expo. Attempt to invoke interface method 'void com.sunmi.peripheral.printer.SunmiPrinterService.printText' on a null object reference