java - NfcAdapter.enableReaderMode() 抛出 java.lang.NoClassDefFoundError

Question

我在主 Activity 的 onCreate() 方法中有以下代码:

super.mAdapter.enableReaderMode(this, new NfcAdapter.ReaderCallback() {
        @Override
        public void onTagDiscovered(Tag tag) {
        MessageBox.show(Login.this, "onTagDiscovered");
    }
}, NfcAdapter.FLAG_READER_NO_PLATFORM_SOUNDS, null);

但这给出了一个 java.lang.NoClassDefFoundError。当我到达此代码时，我已验证没有任何内容为空。

07-03 11:40:20.249    2637-2637/com.complync.complyncmobile E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NoClassDefFoundError: com.complync.complyncmobile.Login$3
        at com.complync.complyncmobile.Login.onCreate(Login.java:184)
        at android.app.Activity.performCreate(Activity.java:5015)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2031)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2092)
        at android.app.ActivityThread.access$600(ActivityThread.java:133)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1203)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:137)
        at android.app.ActivityThread.main(ActivityThread.java:4794)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:511)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
        at dalvik.system.NativeStart.main(Native Method)

第 184 行是:

super.mAdapter.enableReaderMode(this, new NfcAdapter.ReaderCallback() {

有人能帮忙吗？

Answer 1

NfcAdapter.ReaderCallback was added in API Level 19 (奇巧)。

如果出现此异常，最可能的解释是您正在测试的设备或模拟器的 API 级别较低。是这样吗？