FlutterPlugins/flutter_barcode_reader
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Code Issues Releases Wiki Activity

Added error handling for declined permission requests.

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This commit is contained in:
Benjamin Sauer 2018-01-05 17:21:25 +01:00
parent 9b88c3ac57
commit 51f43844d7
3 changed files with 43 additions and 27 deletions
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4
android/src/main/kotlin/com/apptreesoftware/barcodescan/BarcodeScanPlugin.kt
View File

@ -41,7 +41,11 @@ class BarcodeScanPlugin(val activity: Activity): MethodCallHandler,
if (resultCode == Activity.RESULT_OK) {
val barcode = data?.getStringExtra("SCAN_RESULT")
barcode?.let { this.result?.success(barcode) }
} else {
val errorCode = data?.getStringExtra("ERROR_CODE")
this.result?.error(errorCode, null, null)
}
return true
}
return false
}

37
android/src/main/kotlin/com/apptreesoftware/barcodescan/BarcodeScannerActivity.kt
View File

@ -26,7 +26,6 @@ import android.app.Activity
import android.content.Intent
import android.content.pm.PackageManager
import android.os.Bundle
import android.support.design.widget.Snackbar
import android.support.v4.app.ActivityCompat
import android.support.v4.content.ContextCompat
import android.view.Menu
@ -38,22 +37,19 @@ import me.dm7.barcodescanner.zxing.ZXingScannerView
class BarcodeScannerActivity : Activity(), ZXingScannerView.ResultHandler {
lateinit var scannerView: me.dm7.barcodescanner.zxing.ZXingScannerView
//lateinit var pressLightSnackBar: Snackbar
companion object {
val REQUEST_TAKE_PHOTO_CAMERA_PERMISSION = 100
val TOGGLE_FLASH = 200
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
title = ""
scannerView = ZXingScannerView(this)
scannerView.setAutoFocus(true)
setContentView(scannerView)
// pressLightSnackBar = Snackbar.make(scannerView, "Press Screen To Turn Light On",
// Int.MAX_VALUE)
// pressLightSnackBar.show()
}
override fun onCreateOptionsMenu(menu: Menu): Boolean {
@ -81,6 +77,7 @@ class BarcodeScannerActivity : Activity(), ZXingScannerView.ResultHandler {
override fun onResume() {
super.onResume()
scannerView.setResultHandler(this)
// start camera immediately if permission is already given
if (!requestCameraAccessIfNecessary()) {
scannerView.startCamera()
}
@ -98,39 +95,39 @@ class BarcodeScannerActivity : Activity(), ZXingScannerView.ResultHandler {
finish()
}
fun finishWithError(errorCode: String) {
val intent = Intent()
intent.putExtra("ERROR_CODE", errorCode)
setResult(Activity.RESULT_CANCELED, intent)
finish()
}
private fun requestCameraAccessIfNecessary(): Boolean {
val array = arrayOf(Manifest.permission.CAMERA)
if (ContextCompat
.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.CAMERA)) {
val snackbar = Snackbar.make(scannerView, "Grant access to the camera to enable barcode scanning.", Snackbar.LENGTH_INDEFINITE)
snackbar.setAction("OK") {
ActivityCompat.requestPermissions(this,
array,
ActivityCompat.requestPermissions(this, array,
REQUEST_TAKE_PHOTO_CAMERA_PERMISSION)
}
snackbar.show()
} else {
ActivityCompat.requestPermissions(this,
array,
REQUEST_TAKE_PHOTO_CAMERA_PERMISSION)
}
return true
}
return false
}
override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>,
grantResults: IntArray) {
override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>,grantResults: IntArray) {
when (requestCode) {
REQUEST_TAKE_PHOTO_CAMERA_PERMISSION -> {
if (PermissionUtil.verifyPermissions(grantResults)) {
scannerView.startCamera()
} else {
finishWithError("PERMISSION_NOT_GRANTED")
}
}
}
else -> {
super.onRequestPermissionsResult(requestCode, permissions, grantResults)
}
}
}
}
object PermissionUtil {

15
example/lib/main.dart
View File

@ -2,6 +2,7 @@ import 'dart:async';
import 'package:barcode_scan/barcode_scan.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
void main() {
runApp(new MyApp());
@ -43,7 +44,21 @@ class _MyAppState extends State<MyApp> {
}
Future scan() async {
try {
String barcode = await BarcodeScanner.scan();
setState(() => this.barcode = barcode);
} on PlatformException catch (e) {
if (e.code == 'PERMISSION_NOT_GRANTED') {
setState(() {
this.barcode = 'The user did not grant the camera permission!';
});
} else {
setState(() => this.barcode = 'Unknown error: $e');
}
} on FormatException{
setState(() => this.barcode = 'null (User returned using the "back"-button before scanning anything. Result)');
} catch (e) {
setState(() => this.barcode = 'Unknown error: $e');
}
}
}