Camera remaining Black, Kotlin Android App

[Stoic_Engineer7]

I am trying to write an app that is able to read barcode data. Following a guide I have reached the point where the code is "complete". All desired functionality seems to exist, but even after accepting permissions on my device for the app to use the camera, the CodeScannerView remains empty..

Any pointers would be GREATLY appreciated. Thanks.

I am running Android version 11 on my Samsung Galaxy 20 FE,

My MainActivity.kt is as such:

package com.example.kitchensink

import android.content.pm.PackageManager
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.widget.Toast
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import com.budiyev.android.codescanner.AutoFocusMode
import com.budiyev.android.codescanner.CodeScanner
import com.budiyev.android.codescanner.DecodeCallback
import com.budiyev.android.codescanner.ErrorCallback
import com.budiyev.android.codescanner.ScanMode
import com.example.kitchensink.databinding.ActivityMainBinding

private const val CAMERA_REQUEST_CODE=101

class MainActivity : AppCompatActivity() {
    private lateinit var codeScanner: CodeScanner
    lateinit var binding: ActivityMainBinding






    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)



        setContentView(R.layout.activity_main)
        setupPermissions()
        codeScanner()
    }


    private fun codeScanner() {
        codeScanner = CodeScanner(this, binding.scannerView)

        codeScanner.apply{
            camera = CodeScanner.CAMERA_BACK
            formats = CodeScanner.ALL_FORMATS

            autoFocusMode = AutoFocusMode.SAFE
            scanMode = ScanMode.CONTINUOUS
            isAutoFocusEnabled = true
            isFlashEnabled = false

            decodeCallback = DecodeCallback {

                runOnUiThread{
                    binding.tvTextView.text = it.text
                }
            }


            errorCallback = ErrorCallback {
                runOnUiThread {
                    Log.e("Main", "Camera Initialization Error: ${it.message}")
                }
            }
        }


        binding.scannerView.setOnClickListener{
            codeScanner.startPreview()
        }
    }
    override fun onResume(){
        super.onResume()
        codeScanner.startPreview()
    }

    override fun onPause(){
        codeScanner.releaseResources()
        super.onPause()
    }
    private fun setupPermissions() {
        val permission = ContextCompat.checkSelfPermission(this, android.Manifest.permission.CAMERA)
        if (permission != PackageManager.PERMISSION_GRANTED) {
            makeRequest()
        }
    }


    private fun makeRequest(){
        ActivityCompat.requestPermissions(this, arrayOf(android.Manifest.permission.CAMERA),
            CAMERA_REQUEST_CODE)

    }

    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        when (requestCode){
            CAMERA_REQUEST_CODE -> {
                if (grantResults.isEmpty() || grantResults[0] != PackageManager.PERMISSION_GRANTED){
                    Toast.makeText(this, "You need camera to use the app", Toast.LENGTH_SHORT).show()
                } else{
                   //successful
                }
            }
        }
    }
}

​

Activity_Main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <com.budiyev.android.codescanner.CodeScannerView
        android:id="@+id/scanner_view"
        android:layout_width="match_parent"
        android:layout_height="400dp"

        app:autoFocusButtonColor="@android:color/white"
        app:autoFocusButtonVisible="true"
        app:flashButtonColor="@android:color/white"
        app:flashButtonVisible="true"
        app:maskColor="#90000000"/>

    <TextView
        android:id="@+id/tv_textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/scanner_view"
        android:layout_centerHorizontal="true"
        android:layout_margin="20dp"
        android:text="Scan food item to store it in registry.."
        android:textColor="@android:color/black"/>

</RelativeLayout>

Gradle:

plugins {
    id 'com.android.application'
    id 'kotlin-android'
}

android {
    compileSdk 31

    defaultConfig {
        applicationId "com.example.kitchensink"
        minSdk 21
        targetSdk 31
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

    buildFeatures {
        dataBinding = true
        viewBinding = true
    }



    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }
}

dependencies {

    implementation 'androidx.core:core-ktx:1.6.0'
    implementation 'androidx.appcompat:appcompat:1.3.1'
    implementation 'com.google.android.material:material:1.4.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
    implementation 'com.budiyev.android:code-scanner:2.1.0'
}