android – NfcAdapter.getDefaultAdapter(this)在模拟器中返回null

概述我试图在模拟器API 10( Android 2.3.3)中测试ForegroundDispatch(http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/nfc/ForegroundDispatch.html). 当我调用NfcAdapter.getDefaultAdapter(t 我试图在模拟器API 10( Android 2.3.3)中测试Foregrounddispatch(http://developer.androID.com/resources/samples/APIDemos/src/com/example/androID/APIs/nfc/Foregrounddispatch.HTML).

当我调用NfcAdapter.getDefaultAdapter(this)时,我得到null.为什么会这样？

码：

public class Foregrounddispatch extends Activity {private NfcAdapter mAdapter;private PendingIntent mPendingIntent;private IntentFilter[] mFilters;private String[][] mTechLists;private TextVIEw mText;private int mCount = 0;@OverrIDepublic voID onCreate(Bundle savedState) {    super.onCreate(savedState);    setContentVIEw(R.layout.foreground_dispatch);    mText = (TextVIEw) findVIEwByID(R.ID.text);    mText.setText("Scan a tag");    mAdapter = NfcAdapter.getDefaultAdapter(this);    // Create a generic PendingIntent that will be deliver to this activity. The NFC stack    // will fill in the intent with the details of the discovered tag before delivering to    // this activity.    mPendingIntent = PendingIntent.getActivity(this,new Intent(this,getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_top),0);    // Setup an intent filter for all MIME based dispatches    IntentFilter ndef = new IntentFilter(NfcAdapter.ACTION_NDEF_disCOVERED);    try {        ndef.addDataType("*/*");    } catch (MalformedMimeTypeException e) {        throw new RuntimeException("fail",e);    }    mFilters = new IntentFilter[] {            ndef,};    // Setup a tech List for all NfcF Tags    mTechLists = new String[][] { new String[] { NfcF.class.getname() } };}@OverrIDepublic voID onResume() {    super.onResume();    mAdapter.enableForegrounddispatch(this,mPendingIntent,mFilters,mTechLists); //CRASHES HERE BECAUSE mAdapter IS NulL}@OverrIDepublic voID onNewIntent(Intent intent) {    Log.i("Foreground dispatch","discovered tag with intent: " + intent);    mText.setText("discovered tag " + ++mCount + " with intent: " + intent);}@OverrIDepublic voID onPause() {    super.onPause();    mAdapter.disableForegrounddispatch(this); }  }

我的清单：

<?xml version="1.0" enCoding="utf-8"?><manifest xmlns:androID="http://schemas.androID.com/apk/res/androID"  package="com.neka.znacka"  androID:versionCode="1"  androID:versionname="1.0"><uses-sdk androID:minSdkVersion="10" /><uses-permission androID:name="androID.permission.NFC"></uses-permission><uses-feature androID:name="androID.harDWare.nfc" androID:required="true" /><application androID:icon="@drawable/icon" androID:label="@string/app_name">    <activity androID:name=".Uvodna"              androID:label="@string/app_name">        <intent-filter>            <action androID:name="androID.intent.action.MAIN" />            <category androID:name="androID.intent.category.LAUNCHER" />        </intent-filter>    </activity>    <activity androID:name="Simulator">    </activity></application>

有任何想法吗？

解决方法 你真的不能对模拟器和NFC做任何有趣的事情.您不希望使用TAG_disCOVERED *** 作,因为这是最后的 *** 作.在真实设备上生成的意图不能像在NFCDemo演示中那样伪造.在2.3.3中更好地支持NFC之前,NFCDemo以2.3发布.这太糟糕了.也许未来会有一些选择,但现在我们都不得不购买具备NFC功能的NFC设备. 总结

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