传输文件的API
从Android4.1开始，NfcAdapter类增加了如下两个推送数据的方法。
NfcAdapter.setBeamPushUris
NfcAdapter.setBeamPushUrisCallback
这两个方法的原型如下：
public void setBeamPushUris(Uri[] uris, Activity activity);
public void setBeamPushUrisCallback(CreateBeamUrisCallback callback, Activity activity);
Demo
1 import java.io.FileOutputStream;
2 import java.io.InputStream;
3
4 import android.app.Activity;
5 import android.app.PendingIntent;
6 import android.content.Intent;
7 import android.net.Uri;
8 import android.nfc.NfcAdapter;
9 import android.nfc.NfcAdapter.CreateBeamUrisCallback;
10 import android.nfc.NfcEvent;
11 import android.os.Bundle;
12
13
14 public class NFCFileActivity extends Activity implements CreateBeamUrisCallback {
15 private NfcAdapter mNfcAdapter;
16 private PendingIntent mPendingIntent;
17 private final String targetFilename = "/sdcard/temp_icon.png";
18
19 @Override
20 protected void onCreate(Bundle savedInstanceState) {
21 super.onCreate(savedInstanceState);
22 setContentView(R.layout.activity_nfcfile);
23
24 mNfcAdapter = mNfcAdapter.getDefaultAdapter(this);
25 mPendingIntent = PendingIntent.getActivity(this, 0, new Intent(this,
26 getClass()), 0);
27
28 try {
29 InputStream is = getResources().getAssets().open("icon.png");
30 FileOutputStream fos = new FileOutputStream(targetFilename);
31 byte[] buffer = new byte[10000];
32 int n = is.read(buffer);
33 fos.write(buffer, 0, n);
34 fos.close();
35 is.close();
36 } catch (Exception e) {
37
38 }
39 mNfcAdapter.setBeamPushUrisCallback(this, this);
40 }
41
42 @Override
43 public Uri[] createBeamUris(NfcEvent event) {
44 Uri[] uris = new Uri[1];
45 Uri uri = Uri.parse("file://" + targetFilename);
46 uris[0] = uri;
47 return uris;
48 }
49
50 }
1 <uses-permission android:name="android.permission.NFC" />
2 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
其实内部是蓝牙在传输,NFC已经不起作用了，可以相隔一定距离，即使NFC中断也没关系，因为是蓝牙在传输。
转载于:https://www.cnblogs.com/androidsj/p/3856443.html
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