当前应用拦截NFC响应，不弹出选择框教程

从上一篇的NFC支持所类型的卡读取之后，下面要解决的就是NFC的拦截响应，如果这一步没有做，当系统内有多个支持NFC的应用的时候，就会在nfc刷卡的时候弹出多个应用选择，我们需要的场景是，当前应用需要用NFC才去刷卡，然后本应用拦截intent分发（Using the Foreground Dispatch System）.

具体的方案：

1.创建PendingIntent来分发要响应的Activity

mPendingIntent = PendingIntent.getActivity(this, 0,new Intent(this, NFCActivity.class).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
2.当刷卡的时候，使用intent过滤器来过滤出你要拦截的Intent

IntentFilter ndef = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);try {ndef.addDataType("*/*");} catch (IntentFilter.MalformedMimeTypeException e) {throw new RuntimeException("fail", e);}intentFiltersArray = new IntentFilter[]{ndef,};
3.设置你要处理的tag technologies到String数组中

techListsArray = new String[][]{new String[]{NfcA.class.getName()}};
4.在onResume和onPause中设置NFCAdapter

public void onPause() {super.onPause();mAdapter.disableForegroundDispatch(this); }public void onResume() {super.onResume();mAdapter.enableForegroundDispatch(this, pendingIntent, intentFiltersArray, techListsArray); }当然之前要定义NfcAdapter

 

nfcAdapter = NfcAdapter.getDefaultAdapter(this);

import android.annotation.SuppressLint; import android.app.AlertDialog; import android.content.DialogInterface; import android.content.Intent; import android.nfc.NfcAdapter; import android.nfc.Tag; import android.os.Bundle; import android.os.Parcelable; import android.provider.Settings; import android.util.Log; import android.widget.Toast;import com.hwuao.ocis.R; import com.hwuao.ocis.components.easyAndroid.BaseActivity; import com.hwuao.ocis.components.easyAndroid.ContentView; import com.hwuao.ocis.components.easyAndroid.tool.AppLogger; import com.hwuao.ocis.event.GetNFCCardEvent; import com.hwuao.ocis.util.StringUtils; import com.hwuao.ocis.util.ToastUtil;/*** NFC响应页面** @author Jinyang*/ @SuppressLint("NewApi") @ContentView(R.layout.activity_nfc) public class NFCActivity extends BaseActivity {public static final String TAG = "NFCActivity";private NfcAdapter nfcAdapter;private String mClientCardNfcId;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);initNfcParse();resolveIntent(getIntent());}private void initNfcParse() {nfcAdapter = NfcAdapter.getDefaultAdapter(this);if (nfcAdapter == null) {AppLogger.e("---->Nfc error ！！！");Toast.makeText(getApplicationContext(), "不支持NFC功能！", Toast.LENGTH_SHORT).show();} else if (!nfcAdapter.isEnabled()) {AppLogger.e("---->Nfc close ！！！");Toast.makeText(getApplicationContext(), "请打开NFC功能！", Toast.LENGTH_SHORT).show();}}@Overrideprotected void onNewIntent(Intent intent) {super.onNewIntent(intent);resolveIntent(intent);}@Overridepublic void onResume() {super.onResume();AppLogger.e("---->onDestroy");if (nfcAdapter != null) {if (!nfcAdapter.isEnabled()) {showWirelessSettingsDialog();}}}private void showWirelessSettingsDialog() {AlertDialog.Builder builder = new AlertDialog.Builder(this);builder.setMessage("不支持此卡");builder.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialogInterface, int i) {Intent intent = new Intent(Settings.ACTION_WIRELESS_SETTINGS);startActivity(intent);}});builder.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialogInterface, int i) {finish();}});builder.create().show();return;}private void resolveIntent(Intent intent) {String action = intent.getAction();if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(action)|| NfcAdapter.ACTION_TECH_DISCOVERED.equals(action)|| NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action)) {Parcelable tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);String nfcId = dumpTagData(tag);if (!nfcId.isEmpty()) {mClientCardNfcId = nfcId;Log.i(TAG, "卡的内容" + mClientCardNfcId);eventBus.post(new GetNFCCardEvent(mClientCardNfcId));finish();} else {ToastUtil.showToastLong(getApplicationContext(), "识别失败！请重新刷卡！");}}}private String dumpTagData(Parcelable p) {Tag tag = (Tag) p;byte[] id = tag.getId();return StringUtils.hexToHexString(id);}}

这个问题的解决体会到一件事，这个问题在国内的博客论坛都没有搜索到，在StackOverFlow上有一篇

http://stackoverflow.com/questions/16542147/how-to-read-nfc-tags-to-prevent-system-dialogs-nfc-starter-list-and-tags-being-d

里面的链接指向的是Android develop。。。NFC foreground dispatching. 

所有的基础教程都可以在developer中找到，以后再也不瞎折腾了，有问题找google

源码请见

https://github.com/xujinyang/NFCALL

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