135 lines
4.1 KiB
Kotlin
135 lines
4.1 KiB
Kotlin
package com.apptreesoftware.barcodescan
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import android.Manifest
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import android.app.Activity
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import android.content.Intent
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import android.content.pm.PackageManager
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import android.os.Bundle
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import android.support.v4.app.ActivityCompat
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import android.support.v4.content.ContextCompat
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import android.view.Menu
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import android.view.MenuItem
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import com.google.zxing.Result
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import me.dm7.barcodescanner.zxing.ZXingScannerView
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class BarcodeScannerActivity : Activity(), ZXingScannerView.ResultHandler {
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lateinit var scannerView: me.dm7.barcodescanner.zxing.ZXingScannerView
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companion object {
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val REQUEST_TAKE_PHOTO_CAMERA_PERMISSION = 100
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val TOGGLE_FLASH = 200
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}
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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title = ""
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scannerView = ZXingScannerView(this)
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scannerView.setAutoFocus(true)
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setContentView(scannerView)
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}
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override fun onCreateOptionsMenu(menu: Menu): Boolean {
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if (scannerView.flash) {
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val item = menu.add(0,
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TOGGLE_FLASH, 0, "Flash Off")
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item.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS)
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} else {
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val item = menu.add(0,
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TOGGLE_FLASH, 0, "Flash On")
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item.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS)
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}
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return super.onCreateOptionsMenu(menu)
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}
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override fun onOptionsItemSelected(item: MenuItem): Boolean {
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if (item.itemId == TOGGLE_FLASH) {
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scannerView.flash = !scannerView.flash
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this.invalidateOptionsMenu()
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return true
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}
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return super.onOptionsItemSelected(item)
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}
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override fun onResume() {
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super.onResume()
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scannerView.setResultHandler(this)
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// start camera immediately if permission is already given
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if (!requestCameraAccessIfNecessary()) {
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scannerView.startCamera()
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}
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}
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override fun onPause() {
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super.onPause()
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scannerView.stopCamera()
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}
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override fun handleResult(result: Result?) {
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val intent = Intent()
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intent.putExtra("SCAN_RESULT", result.toString())
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setResult(Activity.RESULT_OK, intent)
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finish()
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}
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fun finishWithError(errorCode: String) {
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val intent = Intent()
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intent.putExtra("ERROR_CODE", errorCode)
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setResult(Activity.RESULT_CANCELED, intent)
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finish()
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}
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private fun requestCameraAccessIfNecessary(): Boolean {
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val array = arrayOf(Manifest.permission.CAMERA)
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if (ContextCompat
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.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
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ActivityCompat.requestPermissions(this, array,
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REQUEST_TAKE_PHOTO_CAMERA_PERMISSION)
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return true
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}
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return false
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}
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override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>,grantResults: IntArray) {
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when (requestCode) {
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REQUEST_TAKE_PHOTO_CAMERA_PERMISSION -> {
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if (PermissionUtil.verifyPermissions(grantResults)) {
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scannerView.startCamera()
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} else {
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finishWithError("PERMISSION_NOT_GRANTED")
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}
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}
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else -> {
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super.onRequestPermissionsResult(requestCode, permissions, grantResults)
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}
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}
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}
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}
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object PermissionUtil {
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/**
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* Check that all given permissions have been granted by verifying that each entry in the
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* given array is of the value [PackageManager.PERMISSION_GRANTED].
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* @see Activity.onRequestPermissionsResult
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*/
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fun verifyPermissions(grantResults: IntArray): Boolean {
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// At least one result must be checked.
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if (grantResults.size < 1) {
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return false
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}
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// Verify that each required permission has been granted, otherwise return false.
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for (result in grantResults) {
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if (result != PackageManager.PERMISSION_GRANTED) {
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return false
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}
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}
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return true
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}
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}
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