检查对Android设备的NFC功能 [英] Checking NFC feature on Android Device

问题描述

这是在响应

This is in response to question

Step #1: Put this in your manifest:

<uses-feature android:name="android.hardware.nfc" android:required="false" />
Step #2: Call hasSystemFeature(PackageManager.FEATURE_NFC) on PackageManager to see if NFC is available on the current device

我的API级别设置为8，第1步是确定的，但是当我写 hasSystemFeature（PackageManager.FEATURE_NFC）它说 Feature_NFC 多年平均值解析为一个字段， Feature_WIFI FEATURE_BLUETOOTH FEATURE_CAMERA 在那里的选项。
我曾参观过 Android开发者网站，但他们没' ŧ提API级别。
另一个问题是，我可以在AVD测试NFC的应用程序？
人谁可以帮我这个
谢谢

i set the API level to 8,Step 1 is ok, but when I write hasSystemFeature(PackageManager.FEATURE_NFC) it says Feature_NFC doesnot resolve to a field,Feature_WIFI FEATURE_BLUETOOTH FEATURE_CAMERA are the options there. I have visited Android developer Site,but they didn't mention the API level. Another question is Can I test NFC application on AVD? Anyone who can help me this Thanks

推荐答案

请确保您的项目构建目标设定为至少API 9级。

Make sure you are setting project build target to at least api level 9.

在包含的manifest.xml folliwng

Include folliwng in manifest.xml

<uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" /> //If you have icecream sandwich installed.

这将确保您的应用程序将可运行在8 SDK还

It will ensure that your application will be runnable on sdk 8 also

另外，还要确保每当您呼叫的姜饼特定功能然后将它们包装成if条件
如下：

Also make sure whenever you are calling Gingerbread specific features then wrap them into if condition as follows.

      if (Build.VERSION.SDK_INT < Build.VERSION_CODES.GINGERBREAD) {

    } else {
        if (getPackageManager()
                .hasSystemFeature(PackageManager.FEATURE_NFC)) {
            //do processing
        }
    }

测试你可以给一个尝试打开NFC Android模拟器

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