15、NFC技术：使用Android Beam技术传输文件

时间：2023-03-09 04:42:25
15、NFC技术：使用Android Beam技术传输文件
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
15、NFC技术：使用Android Beam技术传输文件
 import java.io.FileOutputStream;

 import java.io.InputStream;

 import android.app.Activity;

 import android.app.PendingIntent;

 import android.content.Intent;

 import android.net.Uri;

 import android.nfc.NfcAdapter;

 import android.nfc.NfcAdapter.CreateBeamUrisCallback;

 import android.nfc.NfcEvent;

 import android.os.Bundle;

 public class NFCFileActivity extends Activity implements CreateBeamUrisCallback {

     private NfcAdapter mNfcAdapter;

     private PendingIntent mPendingIntent;

     private final String targetFilename = "/sdcard/temp_icon.png";

     @Override

     protected 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);

     }

     @Override

     public Uri[] createBeamUris(NfcEvent event) {

         Uri[] uris = new Uri[1];

         Uri uri = Uri.parse("file://" + targetFilename);

         uris[0] = uri;

         return uris;

     }

 }
 <uses-permission android:name="android.permission.NFC" />

     <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。

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