Android Nfc Beam数据传输

本文主要是介绍Android Nfc Beam数据传输，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

   从NfcAdapter的官方文档我们可以得知，Android Beam技术可以实现简单的信息的传输，同样支持文件的传输。

                                                                 简单消息的传输

  一、简单信息的传输API：

    1、enableForegroundNdefPush(Activity activity, NdefMessage message)

    2、setNdefPushMessage (NdefMessage message, Activity activity, Activity... activities)

    3、setNdefPushMessageCallback (NfcAdapter.CreateNdefMessageCallback callback, Activity activity, Activity... activities)

   二、三者之间的区别：

     1：方法一是API 10以后使用，方法二、三都是API 14以后才可以用；

     2：方法二用于传输不可变的数据，而方法三多用于传输可变的数据；

   三、应用：

                                                                             方法一的应用

public class MainActivity extends AppCompatActivity{private NfcAdapter nfcAdapter;private PendingIntent pendingIntent;private IntentFilter[] filters;private String[][] techLists=null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);checkNdef();}private void checkNdef() {nfcAdapter=NfcAdapter.getDefaultAdapter(this);pendingIntent=PendingIntent.getActivity(MainActivity.this, 500, new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);IntentFilter filter = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);try {filter.addDataType("*/*");filters=new IntentFilter[]{filter};} catch (IntentFilter.MalformedMimeTypeException e) {e.printStackTrace();}if (nfcAdapter==null){Toast.makeText(this,"不支持NFC功能",Toast.LENGTH_SHORT).show();}else{if (nfcAdapter.isEnabled()){Toast.makeText(this,"NFC功能已打开",Toast.LENGTH_SHORT).show();}else{Intent intent= new Intent(Settings.ACTION_NFC_SETTINGS);startActivity(intent);}}}@Overrideprotected void onResume() {super.onResume();//前台调度系统nfcAdapter.enableForegroundDispatch(MainActivity.this,pendingIntent,filters,techLists);//enableForegroundNdefPush(Activity activity, NdefMessage message)的使用NdefMessage ndefMessage=NfcWriteUtil.writeAbsoluteUri("http://www.baidu.com");nfcAdapter.enableForegroundNdefPush(this,ndefMessage);}@Overrideprotected void onPause() {super.onPause();nfcAdapter.disableForegroundDispatch(MainActivity.this);}@Overrideprotected void onNewIntent(Intent intent) {super.onNewIntent(intent);Tag tag=intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);}
}

                                                                           方法二的应用

//第一步，实现callBack
public class NfcP2pActivity extends AppCompatActivity implements NfcAdapter.CreateNdefMessageCallback{private NfcAdapter nfcAdapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_nfc_p2p);checkNfcBeam();//第二步，绑定callBacknfcAdapter.setNdefPushMessageCallback(this,this);}private void checkNfcBeam() {nfcAdapter = NfcAdapter.getDefaultAdapter(this);if (nfcAdapter !=null){if (!nfcAdapter.isEnabled()){//支持NFC，但是没有打开Intent intent = new Intent(Settings.ACTION_WIRELESS_SETTINGS);startActivity(intent);}else if(!nfcAdapter.isNdefPushEnabled()){//API 16+Intent intent = new Intent(Settings.ACTION_NFCSHARING_SETTINGS);startActivity(intent);}}}@Overridepublic NdefMessage createNdefMessage(NfcEvent event) {//封装数据，即写数据,发送数据NdefMessage ndefMessage=NfcWriteUtil.writeText("我是测试", Locale.CANADA,true);return ndefMessage;}@Overrideprotected void onNewIntent(Intent intent) {super.onNewIntent(intent);//接收数据setIntent(intent);}@Overrideprotected void onResume() {super.onResume();//判断数据是否为想要的if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(getIntent().getAction())){//解析数据（读数据）}}@Overrideprotected void onPause() {super.onPause();}
}

                                                                              方法三的应用

public class NfcP2p2Activity extends AppCompatActivity {private NfcAdapter nfcAdapter;private NdefMessage ndefMessage;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_nfc_p2p);checkNfcBeam();nfcAdapter.setNdefPushMessage(ndefMessage,this);}private void checkNfcBeam() {nfcAdapter = NfcAdapter.getDefaultAdapter(this);if (nfcAdapter !=null){if (!nfcAdapter.isEnabled()){//支持NFC，但是没有打开Intent intent = new Intent(Settings.ACTION_WIRELESS_SETTINGS);startActivity(intent);}else if(!nfcAdapter.isNdefPushEnabled()){//API 16+Intent intent = new Intent(Settings.ACTION_NFCSHARING_SETTINGS);startActivity(intent);}}}@Overrideprotected void onNewIntent(Intent intent) {super.onNewIntent(intent);//接收数据setIntent(intent);}@Overrideprotected void onResume() {super.onResume();//判断数据是否为想要的if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(getIntent().getAction())){//解析数据（读数据）}}@Overrideprotected void onPause() {super.onPause();}
}

                                                                            文件传输

一、API：

   1、setBeamPushUris(Uri[] uris, Activity activity)

   2、setBeamPushUrisCallback(NfcAdapter.CreateBeamUrisCallback callback, Activity activity)

二、应用：

    

public class NFCFileActivity extends Activity implements CreateBeamUrisCallback {private NfcAdapter mNfcAdapter;private PendingIntent mPendingIntent;private final String targetFilename = "/sdcard/temp_icon.png";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_nfcfile);mNfcAdapter = mNfcAdapter.getDefaultAdapter(this);mPendingIntent = PendingIntent.getActivity(this, 0, new Intent(this,getClass()), 0);try {InputStream is = getResources().getAssets().open("icon.png");FileOutputStream fos = new FileOutputStream(targetFilename);byte[] buffer = new byte[10000];int n = is.read(buffer);fos.write(buffer, 0, n);fos.close();is.close();} catch (Exception e) {}mNfcAdapter.setBeamPushUrisCallback(this, this);}@Overridepublic Uri[] createBeamUris(NfcEvent event) {Uri[] uris = new Uri[1];Uri uri = Uri.parse("file://" + targetFilename);uris[0] = uri;return uris;}}

     

     

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