mobile/home-assistant-android
mobile/home-assistant-android
1
0
Fork 0
mirror of https://github.com/home-assistant/android synced 2024-09-19 16:11:37 +00:00
Code Issues Packages Projects Releases Wiki Activity

Write application record to NFC tags. (#969)

Browse source 
* Write application record to NFC tags.

Relates to #876

This fixes an issue where on certain devices a dialog was showing up when scanning the NFC tags.

After this change, scanned NFC tags go directly into the home assistant android companion app.

I also tested on an iOS device to ensure the written NFC tag is correctly read.

* Add fallback to old version if the message is too large.
This commit is contained in:
Jay Newstrom 2020-09-22 21:06:12 -05:00 committed by GitHub
parent ec5295a546
commit 714060093b
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 15 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

19
app/src/main/java/io/homeassistant/companion/android/nfc/NFCUtil.kt
View file

@ -10,16 +10,19 @@ import android.nfc.NfcAdapter
import android.nfc.Tag
import android.nfc.tech.Ndef
import android.nfc.tech.NdefFormatable
import io.homeassistant.companion.android.BuildConfig
import java.io.IOException
object NFCUtil {
@Throws(Exception::class)
fun createNFCMessage(url: String, intent: Intent?): Boolean {
val nfcRecord = NdefRecord.createUri(url)
val nfcMessage = NdefMessage(arrayOf(nfcRecord))
val applicationRecord = NdefRecord.createApplicationRecord(BuildConfig.APPLICATION_ID)
val nfcMessage = NdefMessage(arrayOf(nfcRecord, applicationRecord))
val nfcFallbackMessage = NdefMessage(arrayOf(nfcRecord))
intent?.let {
val tag = it.getParcelableExtra<Tag>(NfcAdapter.EXTRA_TAG)
return writeMessageToTag(nfcMessage, tag)
return writeMessageToTag(nfcMessage, nfcFallbackMessage, tag)
}
return false
}
@ -42,17 +45,25 @@ object NFCUtil {
}
@Throws(Exception::class)
private fun writeMessageToTag(nfcMessage: NdefMessage, tag: Tag?): Boolean {
private fun writeMessageToTag(
nfcMessage: NdefMessage,
fallbackMessage: NdefMessage,
tag: Tag?
): Boolean {
val nDefTag = Ndef.get(tag)
nDefTag?.let {
it.connect()
var messageToWrite = nfcMessage
if (it.maxSize < nfcMessage.toByteArray().size) {
messageToWrite = fallbackMessage
}
if (it.maxSize < fallbackMessage.toByteArray().size) {
// Message to large to write to NFC tag
throw Exception("Message is too large")
}
return if (it.isWritable) {
it.writeNdefMessage(nfcMessage)
it.writeNdefMessage(messageToWrite)
it.close()
// Message is written to tag
true