Android API方法CardEmulation.getInstance（）的UnsupportedOperationException_Android_Nfc_Payment_Apdu_Hce

Android API方法CardEmulation.getInstance（）的UnsupportedOperationException

android

Android API方法CardEmulation.getInstance（）的UnsupportedOperationException,android,nfc,payment,apdu,hce,Android,Nfc,Payment,Apdu,Hce,我需要检查设备上是否启用了卡模拟。我找到了一种方法：看起来这在某些设备上有效，但并非对所有设备都有效例如，在三星GT-I9300I（Android 4.4）上，有一个NFC模块，但在设置中没有显示点击和付费选项当我的应用程序在该设备上运行时，我收到以下错误： E/CardEmulation: This device does not support card emulation 09-26 16:41:13.592 2625-2625/? E/AndroidRuntime: FATAL E

我需要检查设备上是否启用了卡模拟。我找到了一种方法：

看起来这在某些设备上有效，但并非对所有设备都有效

例如，在三星GT-I9300I（Android 4.4）上，有一个NFC模块，但在设置中没有显示点击和付费选项

当我的应用程序在该设备上运行时，我收到以下错误：

E/CardEmulation: This device does not support card emulation 09-26 16:41:13.592 2625-2625/? E/AndroidRuntime: FATAL EXCEPTION: main Process: com.android.settings, PID: 2625 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.settings/com.android.settings.nfc.PaymentDefaultDialog}: java.lang.UnsupportedOperationException at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2441) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2500) at android.app.ActivityThread.access$900(ActivityThread.java:171) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1309) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:146) at android.app.ActivityThread.main(ActivityThread.java:5679) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.UnsupportedOperationException at android.nfc.cardemulation.CardEmulation.getInstance(CardEmulation.java:159) at com.android.settings.nfc.PaymentBackend.(PaymentBackend.java:53) at com.android.settings.nfc.PaymentDefaultDialog.onCreate(PaymentDefaultDialog.java:57) at android.app.Activity.performCreate(Activity.java:5582) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2405) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2500) at android.app.ActivityThread.access$900(ActivityThread.java:171) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1309) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:146) at android.app.ActivityThread.main(ActivityThread.java:5679) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107) at dalvik.system.NativeStart.main(Native Method) E/CardEmulation：此设备不支持卡模拟 09-26 16:41:13.592 2625-2625/? E/AndroidRuntime:致命异常：主进程：com.android.settings，PID:2625 java.lang.RuntimeException:无法启动活动组件信息{com.android.settings/com.android.settings.nfc.PaymentDefaultDialog}:java.lang.UnsupportedOperationException 在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2441）上在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2500）上在android.app.ActivityThread.access$900（ActivityThread.java:171）在android.app.ActivityThread$H.handleMessage（ActivityThread.java:1309）上位于android.os.Handler.dispatchMessage（Handler.java:102）位于android.os.Looper.loop（Looper.java:146）位于android.app.ActivityThread.main（ActivityThread.java:5679）位于java.lang.reflect.Method.Invokenactive（本机方法）位于java.lang.reflect.Method.invoke（Method.java:515）在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:1291）上位于com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1107）在dalvik.system.NativeStart.main（本机方法）原因：java.lang.UnsupportedOperationException 在android.nfc.cardemulation.cardemulation.getInstance（cardemulation.java:159）上位于com.android.settings.nfc.PaymentBackend.（PaymentBackend.java:53）位于com.android.settings.nfc.PaymentDefaultDialog.onCreate（PaymentDefaultDialog.java:57）位于android.app.Activity.performCreate（Activity.java:5582）位于android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1093）在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2405）上在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2500）上在android.app.ActivityThread.access$900（ActivityThread.java:171）在android.app.ActivityThread$H.handleMessage（ActivityThread.java:1309）上位于android.os.Handler.dispatchMessage（Handler.java:102）位于android.os.Looper.loop（Looper.java:146）位于android.app.ActivityThread.main（ActivityThread.java:5679）位于java.lang.reflect.Method.Invokenactive（本机方法）位于java.lang.reflect.Method.invoke（Method.java:515）在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:1291）上位于com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1107）在dalvik.system.NativeStart.main（本机方法）然而，根据API级别19（Android 4.4）的规定，

CardEmulation

有人能解释一下我为什么会遇到这个异常吗？如何克服此问题？

日志输出中的错误非常明显：

boolean isDefault = false;
if (getPackageManager().hasSystemFeature(PackageManager.FEATURE_NFC_HOST_CARD_EMULATION)) {
    isDefault  = CardEmulation.getInstance(NfcAdapter.getDefaultAdapter(this))
                              .isDefaultServiceForCategory(
                                      new ComponentName(this, MyPaymentService.class),
                                      CardEmulation.CATEGORY_PAYMENT);
}