在onPause（）方法中关闭前一个Activity的NFC侦听器，以确保不会在后续活动中触发不必要的NFC扫描。在新的Activity中，您可以根据需要打开NFC扫描侦听器。

示例代码：

public class MainActivity extends AppCompatActivity {
   private NfcAdapter nfcAdapter;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);

       nfcAdapter = NfcAdapter.getDefaultAdapter(this);

       if (nfcAdapter == null) {
           // NFC is not supported by the device
           return;
       }

       // Enable NFC scanning for the activity
       PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,
           new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
       IntentFilter[] intentFilters = new IntentFilter[] {};

       nfcAdapter.enableForegroundDispatch(this, pendingIntent, intentFilters, null);
   }

   @Override
   protected void onPause() {
       super.onPause();

       // Disable NFC scanning for the activity
       if (nfcAdapter != null) {
           nfcAdapter.disableForegroundDispatch(this);
       }
   }

   @Override
   protected void onResume() {
       super.onResume();

       // Enable NFC scanning for the activity
       PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,
           new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
       IntentFilter[] intentFilters = new IntentFilter[] {};

       nfcAdapter.enableForegroundDispatch(this, pendingIntent, intentFilters, null);
   }

   @Override
   protected void onNewIntent(Intent intent) {
       super.onNewIntent(intent);

       // Handle new NFC tag scanned
       Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
       // Process tag data...
   }
}