Add DX_FILM_EDGE barcode format

And add it to the selected barcodes so it's immediately
available for existing installations too.

README.md

@@ -36,6 +36,7 @@ ZXing can read the following barcode formats:
 * [CODE 93][code_93]
 * [CODE 128][code_128]
 * [DATA MATRIX][data_matrix]
+* [DX FILM EDGE][dx_film_edge]
 * [EAN 8][ean_8]
 * [EAN 13][ean_13]
 * [ITF][itf]
@@ -144,6 +145,7 @@ class YourActivity : Activity() {
 [code_93]: https://en.wikipedia.org/wiki/Code_93
 [code_128]: https://en.wikipedia.org/wiki/Code_128
 [data_matrix]: https://en.wikipedia.org/wiki/Data_Matrix
+[dx_film_edge]: https://en.wikipedia.org/wiki/DX_encoding
 [ean_8]: https://en.wikipedia.org/wiki/EAN-8
 [ean_13]: https://en.wikipedia.org/wiki/International_Article_Number
 [itf]: https://en.wikipedia.org/wiki/Interleaved_2_of_5

app/src/main/kotlin/de/markusfisch/android/binaryeye/preference/Preferences.kt

@@ -21,6 +21,7 @@ class Preferences {
 		BarcodeFormat.DATA_BAR.name,
 		BarcodeFormat.DATA_BAR_EXPANDED.name,
 		BarcodeFormat.DATA_MATRIX.name,
+		BarcodeFormat.DX_FILM_EDGE.name,
 		BarcodeFormat.EAN_8.name,
 		BarcodeFormat.EAN_13.name,
 		BarcodeFormat.ITF.name,
@@ -218,16 +219,11 @@ class Preferences {
 	fun update() {
 		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
 			preferences.getStringSet(BARCODE_FORMATS, barcodeFormats)?.let {
-				// Add rMQR Code for existing installations.
-				val addRMQRCode = "rmqr_added"
-				barcodeFormats = if (!preferences.getBoolean(addRMQRCode, false)) {
-					preferences.edit().putBoolean(addRMQRCode, true).apply()
-					it.toMutableSet().apply {
-						add(BarcodeFormat.RMQR_CODE.name)
-					}
-				} else {
-					it
-				}
+				barcodeFormats = addFormatsOnUpdate(
+					it,
+					BarcodeFormat.RMQR_CODE,
+					BarcodeFormat.DX_FILM_EDGE
+				)
 			}
 		}
 		cropHandleX = preferences.getInt(CROP_HANDLE_X, cropHandleX)
@@ -325,6 +321,19 @@ class Preferences {
 		)
 	}
 
+	private fun addFormatsOnUpdate(
+		restored: Set<String>,
+		vararg formats: BarcodeFormat
+	) = restored.toMutableSet().apply {
+		for (format in formats) {
+			val name = "${format.name}_added"
+			if (!preferences.getBoolean(name, false)) {
+				preferences.edit().putBoolean(name, true).apply()
+				add(format.name)
+			}
+		}
+	}
+
 	fun beepTone() = when (beepToneName) {
 		"tone_cdma_confirm" -> ToneGenerator.TONE_CDMA_CONFIRM
 		"tone_sup_radio_ack" -> ToneGenerator.TONE_SUP_RADIO_ACK

app/src/main/res/values/barcode_formats.xml

@@ -8,6 +8,7 @@
 		<item>DATA BAR</item>
 		<item>DATA BAR EXPANDED</item>
 		<item>DATA MATRIX</item>
+		<item>DX FILM EDGE</item>
 		<item>EAN 8</item>
 		<item>EAN 13</item>
 		<item>ITF</item>
@@ -28,6 +29,7 @@
 		<item>DATA_BAR</item>
 		<item>DATA_BAR_EXPANDED</item>
 		<item>DATA_MATRIX</item>
+		<item>DX_FILM_EDGE</item>
 		<item>EAN_8</item>
 		<item>EAN_13</item>
 		<item>ITF</item>