我正在尝试将以下代码块添加到现有类
Class nfcExtrasClazz = Class.forName("com.android.nfc_extras.NfcAdapterExtras");
Method getMethod = nfcExtrasClazz .getMethod("get", Class.forName("android.nfc.NfcAdapter"));
NfcAdapter adapter = NfcAdapter.getDefaultAdapter(this);
Object nfcExtras = getMethod .invoke(nfcExtrasClazz, adapter);
Method getEEMethod = nfcExtras.getClass().getMethod("getEmbeddedExecutionEnvironment", (Class[]) null);
Object ee = getEEMethod.invoke(nfcExtras , (Object[]) null);
Class eeClazz = se.getClass();
Method openMethod = eeClazz.getMethod("open", (Class[]) null);
Method transceiveMethod = ee.getClass().getMethod("transceive",new Class[] { byte[].class });
Method closeMethod = eeClazz.getMethod("close", (Class[]) null);
openMethod.invoke(se, (Object[]) null);
Object response = transceiveMethod.invoke(se, command);
closeMethod.invoke(se, (Object[]) null);
我意识到我需要将此代码放在另一个线程中。所以我得到了一个现有的本地服务实现，并试图将上面的代码添加到它。但是在服务实现代码中我得到以下错误：＆＃34; NfcAdapter类型中的方法getDefaultAdapter（Context）不适用于参数 （BackgroundService.ServiceWorker）＆＃34; 包中有两个类;一个是主要的： 公共类MainActivity扩展Activity { private static final String TAG =＆＃34; MainActivity＆＃34 ;; private int counter = 1; 私人NfcAdapter适配器;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public void doClick(View view) {
switch(view.getId()) {
case R.id.startBtn:
Log.v(TAG, "Starting service... counter = " + counter);
adapter = NfcAdapter.getDefaultAdapter(this);
Intent intent = new Intent(MainActivity.this,
BackgroundService.class);
intent.putExtra("counter", counter++);
startService(intent);
break;
case R.id.stopBtn:
stopService();
}
}
private void stopService() {
Log.v(TAG, "Stopping service...");
if(stopService(new Intent(MainActivity.this,
BackgroundService.class)))
Log.v(TAG, "stopService was successful");
else
Log.v(TAG, "stopService was unsuccessful");
}
@Override
public void onDestroy()
{
stopService();
super.onDestroy();
}
}
这是实现本地服务的类： 公共类BackgroundService扩展了Service { private static final String TAG =＆＃34; BackgroundService＆＃34 ;; private NotificationManager notificationMgr; 私人NfcAdapter适配器; private ThreadGroup myThreads = new ThreadGroup（＆＃34; ServiceWorker＆＃34;）;
@Override
public void onCreate() {
super.onCreate();
Log.v(TAG, "in onCreate()");
notificationMgr =(NotificationManager)getSystemService(
NOTIFICATION_SERVICE);
displayNotificationMessage("Background Service is running");
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
super.onStartCommand(intent, flags, startId);
int counter = intent.getExtras().getInt("counter");
Log.v(TAG, "in onStartCommand(), counter = " + counter +
", startId = " + startId);
new Thread(myThreads, new ServiceWorker(counter), "BackgroundService")
.start();
return START_NOT_STICKY;
}
class ServiceWorker implements Runnable
{
private int counter = -1;
public ServiceWorker(int counter) {
this.counter = counter;
}
public void run() {
final String TAG2 = "ServiceWorker:" + Thread.currentThread().getId();
// do background processing here...
try {
Log.v(TAG2, "sleeping for 10 seconds. counter = " + counter);
Thread.sleep(10000);
// I added the following code; I temprarily commented all of lines out
//NfcAdapterExtras adapterExtras = NfcAdapterExtras.get(NfcAdapter.getDefaultAdapter(this));
//NfcExecutionEnvironment nfceEe = adapterExtras.getEmbeddedExecutionEnvironment();
Class nfcExtrasClazz = null;
try {
nfcExtrasClazz = Class.forName("com.android.nfc_extras.NfcAdapterExtras");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Method getMethod = null;
try {
getMethod = nfcExtrasClazz .getMethod("get", Class.forName("android.nfc.NfcAdapter"));
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
adapter = NfcAdapter.getDefaultAdapter(this);
Object nfcExtras = null;
try {
nfcExtras = getMethod .invoke(nfcExtrasClazz, adapter);
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Method getEEMethod = null;
try {
getEEMethod = nfcExtras.getClass().getMethod("getEmbeddedExecutionEnvironment",
(Class[]) null);
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Object ee = null;
try {
ee = getEEMethod.invoke(nfcExtras , (Object[]) null);
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Class eeClazz = ee.getClass();
Method openMethod = null;
try {
openMethod = eeClazz.getMethod("open", (Class[]) null);
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Method transceiveMethod = null;
try {
transceiveMethod = ee.getClass().getMethod("transceive",
new Class[] { byte[].class });
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Method closeMethod = null;
try {
closeMethod = eeClazz.getMethod("close", (Class[]) null);
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
openMethod.invoke(ee, (Object[]) null);
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String command = "00000000";
try {
Object myresponse = transceiveMethod.invoke(ee, command );
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
closeMethod.invoke(ee, (Object[]) null);
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.v(TAG2, "... waking up");
} catch (InterruptedException e) {
// TODO Auto-generated catch block
Log.v(TAG2, "... sleep interrupted");
}
}
}
@Override
public void onDestroy()
{
Log.v(TAG, "in onDestroy(). Interrupting threads and cancelling notifications");
myThreads.interrupt();
notificationMgr.cancelAll();
super.onDestroy();
}
@Override
public IBinder onBind(Intent intent) {
Log.v(TAG, "in onBind()");
return null;
}
private void displayNotificationMessage(String message)
{
Notification notification = new Notification(R.drawable.emo_im_winking,
message, System.currentTimeMillis());
notification.flags = Notification.FLAG_NO_CLEAR;
PendingIntent contentIntent =
PendingIntent.getActivity(this, 0, new Intent(this, MainActivity.class), 0);
notification.setLatestEventInfo(this, TAG, message, contentIntent);
notificationMgr.notify(0, notification);
}
}
我想我可能不会将主活动中的nfcadapter实例添加到服务中？有人可以看看吗？
答案 0 :(得分：1)
查看链接，用ee替换你的se，这是一个错字。
答案 1 :(得分：0)
se永远不会使用此代码创建，因此无法解析为对象。
我们第一次看到se在通话中
Class eeClazz = se.getClass();
这可能是你得到错误的地方。