我想读的三星Nexus手机，但Android的NFC API不提供足够的选项卡。我已经使用第三方API名称开放NFC也尝试过，但它给人的不支持API错误。任何人都可以向我提供的code从卡中读取数据。我有code读取标签，但不能读取卡。这里是下载开放API NFC链接。

的http://sourceforge.net/projects/open-nfc/files/Open%20NFC%204.3%20beta%20%2810381%29/

任何帮助是AP preciated。

这是code I使用。它给人的opennfc失败的错误...

 公共类NFCone扩展活动实现CardDetectionEventHandler，ReadCompletionEventHandler，NfcTagDetectionEventHandler {CardListenerRegistry我= NULL;CardDetectionEventHandler手= NULL;NfcManager nfcMngr = NULL;NfcTagManager mNfcTagManager = NULL;NfcTagDetectionEventHandler tagHand = NULL;ReadCompletionEventHandler readHand = NULL;公共无效的onCreate（捆绑savedInstanceState）{    super.onCreate（savedInstanceState）;    的setContentView（R.layout.main1）;    的System.out.println（的onCreate）;    尝试    {        nfcMngr.start（）;        i.registerCardListener（NfcPriority.MAXIMUM，手）;    }    赶上（例外五）    {    }}保护无效onResume（）{    // TODO自动生成方法存根    super.onResume（）;    的System.out.println（onResume）;    Toast.makeText（这一点，NDEF读者开始......，Toast.LENGTH_SHORT）            。显示（）;    尝试{    如果（mNfcTagManager！= NULL）{        mNfcTagManager.registerTagListener（NfcPriority.MAXIMUM，tagHand）;        mNfcTagManager.registerMessageReader（NdefTypeNameFormat.WELL_KNOWN，                U，NfcPriority.MINIMUM，这一点）;    }    }    赶上（例外五）    {}    }保护无效的onPause（）{    super.onPause（）;    的System.out.println（的onPause）;    mNfcTagManager.unregisterMessageReader（readHand）;    mNfcTagManager.unregisterTagListener（tagHand）;}保护无效的onDestroy（）{    super.onDestroy（）;    的System.out.println（的onDestroy）;    i.unregisterCardListener（手）;    尝试{    nfcMngr.stop（）;    }    赶上（例外五）    {}}公共无效onCardDetected（连接接口）{    的System.out.println（onCardDetected）;    // ConnectionProperty [] CON = connection.getProperties（）;}公共无效onCardDetectedError（NfcError code什么的）{    的System.out.println（onCardDetectedError）;    // TODO自动生成方法存根}私人无效startBrowserOn（字符串URL）{    的System.out.println（startBrowserOn）;    startActivity（新意图（Intent.ACTION_VIEW，Uri.parse（URL）））;}公共无效onReadError（NfcError code什么的）{    的System.out.println（onReadError）;}公共无效onTagRead（NdefMessage消息）{    {        的System.out.println（onTagRead）;        如果（消息！= NULL）{            矢量＆lt;＆NdefRecord GT;记录= message.getRecords（）;            的for（int i = 0; I＆LT; records.size（）;我++）{                如果（UriRecord.isUriRecord（records.elementAt（ⅰ）））{                    UriRecord URI;                    尝试{                        尝试{                            URI =新UriRecord（records.elementAt（I））;                            startBrowserOn（uri.getUri（）的toString（））;                        }赶上（NfcException E）{                            // TODO自动生成catch块                            e.printStackTrace（）;                        }                    }赶上（的URISyntaxException E）{                        // TODO自动生成catch块                        e.printStackTrace（）;                        Toast.makeText（这一点，的URISyntaxException！                                Toast.LENGTH_SHORT）.show（）;                    }                    打破;                }}}}}    公共无效onTagDetected（NfcTagConnection连接）{    的System.out.println（onTagDetected）;}    公共无效onTagDetectedError（NfcError code什么的）{    的System.out.println（onTagDetectedError）;} } 

解决方案

您需要将opennfc库添加到您的Eclipse项目。

在项目点击右键，选择属性中，转到 Java构建路径|库。点击添加外部JAR 并选择您opennfc库。最后，点击订单和出口标签，并确保您的opennfc库被选中用于出口。

I want to read a card from Samsung Nexus phone but the android nfc api does not provide enough options. i've also tried using a third party api names "open nfc" but the it gives error of not supporting the api. Can anyone provide me the code to read data from a card. I have the code to read a tag but not to read a card. Here is the link to download the open nfc api.

http://sourceforge.net/projects/open-nfc/files/Open%20NFC%204.3%20beta%20%2810381%29/

Any help is appreciated.

This is the code i used. Its giving an error of opennfc failing...

   public class NFCone  extends Activity implements CardDetectionEventHandler,     ReadCompletionEventHandler,NfcTagDetectionEventHandler{

CardListenerRegistry i=null;
CardDetectionEventHandler hand=null;
NfcManager nfcMngr = null;
NfcTagManager mNfcTagManager=null;
NfcTagDetectionEventHandler tagHand=null;
ReadCompletionEventHandler readHand=null;
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);

    setContentView(R.layout.main1); 
    System.out.println("onCreate");
    try
    {
        nfcMngr.start();
        i.registerCardListener(NfcPriority.MAXIMUM, hand);
    }
    catch(Exception e)
    {

    }
}
protected void onResume() {
    // TODO Auto-generated method stub

    super.onResume();
    System.out.println("onResume");

    Toast.makeText(this, "NDEF reader Starting ... ", Toast.LENGTH_SHORT)
            .show();
    try{
    if (mNfcTagManager != null) {

        mNfcTagManager.registerTagListener(NfcPriority.MAXIMUM, tagHand);
        mNfcTagManager.registerMessageReader(NdefTypeNameFormat.WELL_KNOWN,
                "U", NfcPriority.MINIMUM, this);
    }
    }
    catch(Exception e)
    {       }
    }
protected void onPause() 
{   
    super.onPause();
    System.out.println("onPause");
    mNfcTagManager.unregisterMessageReader(readHand);
    mNfcTagManager.unregisterTagListener(tagHand);

}
protected void onDestroy() 

{ 
    super.onDestroy();
    System.out.println("onDestroy");
    i.unregisterCardListener(hand);
    try{
    nfcMngr.stop();
    }
    catch(Exception e)
    {       }
}
public void onCardDetected(Connection connection) {
    System.out.println("onCardDetected");

    //ConnectionProperty[] con = connection.getProperties();

}
public void onCardDetectedError(NfcErrorCode what) {
    System.out.println("onCardDetectedError");
    // TODO Auto-generated method stub

}
private void startBrowserOn(String url) {
    System.out.println("startBrowserOn");
    startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
}
public void onReadError(NfcErrorCode what) {
    System.out.println("onReadError");
}
public void onTagRead(NdefMessage message) {
    {
        System.out.println("onTagRead");
        if (message != null) {

            Vector<NdefRecord> records = message.getRecords();

            for (int i = 0; i < records.size(); i++) {

                if (UriRecord.isUriRecord(records.elementAt(i))) {

                    UriRecord uri;

                    try {
                        try {

                            uri = new UriRecord(records.elementAt(i));
                            startBrowserOn(uri.getUri().toString());
                        } catch (NfcException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }

                    } catch (URISyntaxException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();

                        Toast.makeText(this, "URISyntaxException! ",
                                Toast.LENGTH_SHORT).show();
                    }

                    break;
                }}}}
}
    public void onTagDetected(NfcTagConnection connection) {
    System.out.println("onTagDetected");

}
    public void onTagDetectedError(NfcErrorCode what) {
    System.out.println("onTagDetectedError");

}
 }

You need to add the opennfc library to your Eclipse project.

Right click on the project and select Properties, the go to Java Build Path|Libraries. Click Add external JARs and select your opennfc library. Finally, Click on the Order and Export tab and make sure that your opennfc library is checked for export.