Android NFC

1. 确认nfc是否可用

[java]
NfcManager manager = (NfcManager) Context.getSystemService(Context.NFC_SERVICE); 
        NfcAdapter adapter = manager.getDefaultAdapter(); 
        if (adapter != null && adapter.isEnabled()) { 
            // adapter exists and is enabled.  
            System.out.println("can"); 
        }else{ 
            System.out.println("can't");   //  
        } 

NfcManager manager = (NfcManager) Context.getSystemService(Context.NFC_SERVICE);
  NfcAdapter adapter = manager.getDefaultAdapter();
  if (adapter != null && adapter.isEnabled()) {
      // adapter exists and is enabled.
   System.out.println("can");
  }else{
   System.out.println("can't");   //
  }

2. 如果NFC 没有open，从程序中进入NFC设置界面

[java]
startActivity(new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS)); 

startActivity(new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS));

note：不能再程序中打开和关闭NFC设置，SDK api 没有提供接口。