Android Question NFC Intent

akinnovation · Mar 1, 2017

Hi,
I need to catch NfcV intent with my application, and I wish that it will resume and show app.
I have see the thread https://www.b4x.com/android/forum/threads/how-to-make-nfc-tag-trigger-application.73561/. I have copied the modify to manifest as write from Erel, but when I compile the project I had an error:
Generating R file. Error
AndroidManifest.xml:35: error: Error parsing XML: not well-formed (invalid token)

Where is my mistake ?

marco

Jmu5667 · Mar 1, 2017

Hi

Try this

B4X:

AddActivityText(Main, <intent-filter>
               <action android:name="android.nfc.action.NDEF_DISCOVERED"/>
             <category android:name="android.intent.category.DEFAULT"/>
             <data android:mimeType="text/plain" />
           </intent-filter>)

AddActivityText(Main, <intent-filter>
             <action android:name="android.nfc.action.TAG_DISCOVERED"/>
         <category android:name="android.intent.category.DEFAULT"/>
             <data android:mimeType="text/plain" />
           </intent-filter>)
     
AddActivityText(Main, <intent-filter>
             <action android:name="android.nfc.action.TECH_DISCOVERED"/>
             <category android:name="android.intent.category.DEFAULT"/>
             <data android:mimeType="text/plain" />
           </intent-filter>)
   
AddActivityText(Main,<meta-data
       android:name="android.nfc.action.TECH_DISCOVERED"
       android:resource="@xml/nfc_tech_filter"
           />)

Jmu5667 · Mar 1, 2017

Also the 'nfc_tech_filter.xml' should look like this:

B4X:

<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
  <tech-list>
  <tech>android.nfc.tech.IsoDep</tech>
  <tech>android.nfc.tech.NfcA</tech>
  <tech>android.nfc.tech.NfcB</tech>
  <tech>android.nfc.tech.NfcF</tech>
  <tech>android.nfc.tech.NfcV</tech>
  <tech>android.nfc.tech.Ndef</tech>
  <tech>android.nfc.tech.NdefFormatable</tech>
  <tech>android.nfc.tech.MifareClassic</tech>
  <tech>android.nfc.tech.MifareUltralight</tech>
  </tech-list>
</resources>

akinnovation · Mar 1, 2017

Many thanks, now I can compile it I have added only:

B4X:

CreateResource(xml, nfc_tech_filter.xml,
<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
  <tech-list>
  <tech>android.nfc.tech.NfcV</tech>
  </tech-list>
</resources>)

Jmu5667 · Mar 1, 2017

akinnovation said:
Many thanks, now I can compile it I have added only:

B4X:

CreateResource(xml, nfc_tech_filter.xml, <resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2"> <tech-list> <tech>android.nfc.tech.NfcV</tech> </tech-list> </resources>)

Read this https://developer.android.com/reference/android/nfc/tech/NfcV.html, and make sure the tags you are using are compatable

akinnovation · Mar 1, 2017

Many thanks Jmu5667

DonManfred · Mar 1, 2017

akinnovation said:
Where is my mistake ?

Do the changes in manifest again based on the NFC tutorial.

akinnovation · Mar 1, 2017

DonManfred said:
Do the changes in manifest again based on the NFC tutorial.

Now I can compile the Advanced NFC project, but it doesn't resume if is in pause, if it is active I can see the uid I have read.

Erel · Mar 2, 2017

What happens when you scan the tag while your app is in the background? A different app is started?

akinnovation · Mar 2, 2017

No, I hear the scan ok sound and nothing appear.

Erel · Mar 2, 2017

Can you post the full code from the manifest editor?

akinnovation · Mar 2, 2017

This is the manifest editor source code

B4X:

AddManifestText(
<uses-sdk android:minSdkVersion="16" android:targetSdkVersion="19"/>
<supports-screens android:largeScreens="true"
    android:normalScreens="true"
    android:smallScreens="true"
    android:anyDensity="true"/>)
SetApplicationAttribute(android:icon, "@drawable/icon")
SetApplicationAttribute(android:label, "$LABEL$")
AddActivityText(Main, <intent-filter>
               <action android:name="android.nfc.action.NDEF_DISCOVERED"/>
             <category android:name="android.intent.category.DEFAULT"/>
             <data android:mimeType="text/plain" />
           </intent-filter>)

AddActivityText(Main, <intent-filter>
             <action android:name="android.nfc.action.TAG_DISCOVERED"/>
         <category android:name="android.intent.category.DEFAULT"/>
             <data android:mimeType="text/plain" />
           </intent-filter>)
    
AddActivityText(Main, <intent-filter>
             <action android:name="android.nfc.action.TECH_DISCOVERED"/>
             <category android:name="android.intent.category.DEFAULT"/>
             <data android:mimeType="text/plain" />
           </intent-filter>)
  
AddActivityText(Main,<meta-data
       android:name="android.nfc.action.TECH_DISCOVERED"
       android:resource="@xml/nfc_tech_filter"
           />)
CreateResource(xml, nfc_tech_filter.xml,
<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
  <tech-list>
  <tech>android.nfc.tech.NfcV</tech>
  </tech-list>
</resources>)

Erel · Mar 2, 2017

Connect to the device in USB debug mode and monitor the unfiltered logs while you scan the tag. Do you see any mention of an intent being sent?

akinnovation · Mar 2, 2017

Hi Erel when the app is in pause I don't see any intent I see only:

Check NDEF Failed - status = 3
START u0 {act=android.nfc.action.TAG_DISCOVERED flg=0x10020000 cmp=Advanced.Nfc/.main (has extras)} from uid 10177 on display 0
.....
Starting background presence check
START u0 {flg=0x10008000 cmp=com.android.nfc/.NfcRootActivity (has extras)} from uid 1027 on display 0
.....
START u0 {act=android.nfc.action.TAG_DISCOVERED (has extras)} from uid 1027 on display 0

and with the app running:

Connect to a tech with a different handle
Check NDEF Failed - status = 3
START u0 {act=android.nfc.action.TAG_DISCOVERED flg=0x10020000 cmp=Advanced.Nfc/.main (has extras)} from uid 10177 on display 0
** Activity (main) Pause, UserClosed = false **
** Activity (main) Resume **
AUDIO_OUTPUT_FLAG_FAST denied by client
Techs: [android.nfc.tech.NfcV, android.nfc.tech.NdefFormatable]

Thank you for your replies

akinnovation · Mar 2, 2017

Hi ,
I have found the trouble in the Manifest. Because I use blank tag I have deleted the

AddActivityText(Main, <intent-filter>
<action android:name="android.nfc.action.NDEF_DISCOVERED"/>
<category android:name="android.intent.category.DEFAULT"/>
<data android:mimeType="text/plain" />
</intent-filter>)

and to the other intent filter I have deleted only

<data android:mimeType="text/plain" />

and now the app will popoup at tag scanning.

Thank you for the forum support

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