QrScannerActivity.kt

package com.paragoncoin.paragon.core.ui.barcode

import android.Manifest
import android.annotation.SuppressLint
import android.content.Context
import android.content.Intent
import android.content.pm.PackageManager
import android.os.Bundle
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import com.paragoncoin.paragon.core.R
import com.paragoncoin.paragon.core.extension.view.onClick
import com.paragoncoin.paragon.core.ui.base.activity.BaseActivity
import com.paragoncoin.paragon.core.ui.base.bottombar.HasBottomBar
import com.paragoncoin.paragon.core.ui.base.setContent
import com.paragoncoin.paragon.core.ui.base.toolbar.HasToolbar
import kotlinx.android.synthetic.main.activity_qr_scanner.*
import org.jetbrains.anko.intentFor

class QrScannerActivity : BaseActivity(), HasBottomBar, HasToolbar {


    @SuppressLint("MissingPermission")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent(R.layout.activity_qr_scanner)

        screenTitle = getString(R.string.qr_scanner)

        btnCancel.onClick(::onBackPressed)

        scannerPreview.onBarcodeDetected {
            setResult(RESULT_OK, Intent().putExtra(QRCODE, it.rawValue))
            finish()
        }

        if (isCameraPermissionGranted()) {
            scannerPreview.start()
        } else requestCameraPermission()
    }


    @SuppressLint("MissingPermission")
    override fun onResume() {
        super.onResume()
        if (isCameraPermissionGranted()) scannerPreview.startWithRefresh()
    }

    override fun onPause() {
        super.onPause()
        scannerPreview.stop()
    }

    override fun onStop() {
        super.onStop()
        scannerPreview.release()
    }


    private fun isCameraPermissionGranted() = ContextCompat.checkSelfPermission(
            this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED

    private fun requestCameraPermission() = ActivityCompat.requestPermissions(
            this, arrayOf(Manifest.permission.CAMERA), CAMERA_PERMISSION_REQUEST_CODE)


    companion object {
        const val QRCODE = "qrcode"

        private const val CAMERA_PERMISSION_REQUEST_CODE = 1

        @Suppress("FunctionName")
        fun Intent(context: Context) = context.intentFor<QrScannerActivity>()


    }

}