在Nexus S安装Android 2.3.4之后，NFC应用程序不会再启动

Question

在我的Nexus S上安装Android 2.3.4后，NFC应用程序不会再启动。 我尝试过google文档中描述的三个意图（ndef_discovered，tech_discovered，tag_discovered），但其中任何一个都解决了问题，nexux s在打开默认的google应用程序上，并忽略我的应用程序。

我在清单中有这个

<intent-filter>
<action android:name="android.nfc.action.TAG_DISCOVERED"/>
</intent-filter>

.

如果我没有错，它似乎在新闻中得到了支持2.3.3，为什么nexus s忽略它？

你能帮我。

最好的问候， 雨果。

Answer 1

You need to add this to your intent filters:

<intent-filter>
   <action android:name="android.nfc.action.NDEF_DISCOVERED"/>
</intent-filter>

When a tag is scanned, Android should show a popup asking which app to handle it.

Update

Based on additional info from your comment, the problem is that your tag contains information which is recognized by Android. In this case, that is a URL. Since Android can find an app (the default NFC app) which can handle urls, then that app will take priority and be called instead of an app which simple handles tag discovery. Tag discovery is only dispatched if no other intent filter matched the tag. To quote the docs:

android.nfc.action.TAG_DISCOVERED: This intent starts if no Activities handle the NDEF_DISCOVERED and TECH_DISCOVERED intents or if the tag that is scanned is unknown.

So you must declare your tag to handle messages in the tags as well. You need to specify exactly the type of data you are targeting as well (in this case, urls), else the Google Android app will still take precedence for URLs. You can read more information on the Android NFC page

Answer 2

You have to also add data in the intent filter. Please refer to http://developer.android.com/guide/topics/nfc/nfc.html#tech-disc

and look under ACTION_NDEF_DISCOVERED in Filtering for NFC intents.