Android NFC App

I'm writing not so complicated application but I have a big problem;)

In my application are some activities first, login page than, nfc tag rea开发者_如何学运维der and than, some menu. My question is how to catch in my second activity that intent with discoverd tag with out restarting activity? What to use

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Take a good look at the foreground dispatch system capability as described on the NfcAdapter page (enableForegroundDispatch()). Your activity can call a method to basically intercept a tag intent that you're interested in; your activity gets priority over all other activities. You'll get the tag delivered to you in the onNewIntent() callback of your existing activity.

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You need to use enableForegroundDispatch(activity, pendingIntent, null, null) and then make sure the pendingIntent wraps an intent that has the flag SINGLE_TOP. The intent should start the same activity, and because SINGLE_TOP is used the activity currently in memory will just be used. onNewIntent() is called and you can then extract the tag out of the intent.