package com.example.nfc.ui; import android.content.Intent; import android.nfc.NdefMessage; import android.nfc.NdefRecord; import android.nfc.NfcAdapter; import android.nfc.Tag; import android.nfc.tech.Ndef; import android.os.Bundle; import android.widget.Toast; import com.example.nfc.R; import com.example.nfc.base.BaseNfcActivity; import com.example.nfc.UriPrefix; public class WriteUriActivity extends BaseNfcActivity { private String mUri = "http://www.baidu.com"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_write_uri); } public void onNewIntent(Intent intent) { Tag detectedTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG); NdefMessage ndefMessage = new NdefMessage(new NdefRecord[]{createUriRecord(mUri)}); boolean result = writeTag(ndefMessage, detectedTag); if (result) { Toast.makeText(this, "写入成功", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(this, "写入失败", Toast.LENGTH_SHORT).show(); } } /** * 将Uri转成NdefRecord * * @param uriStr * @return */ public static NdefRecord createUriRecord(String uriStr) { byte prefix = 0; for (Byte b : UriPrefix.URI_PREFIX_MAP.keySet()) { String prefixStr = UriPrefix.URI_PREFIX_MAP.get(b).toLowerCase(); if ("".equals(prefixStr)) continue; if (uriStr.toLowerCase().startsWith(prefixStr)) { prefix = b; uriStr = uriStr.substring(prefixStr.length()); break; } } byte[] data = new byte[1 + uriStr.length()]; data[0] = prefix; System.arraycopy(uriStr.getBytes(), 0, data, 1, uriStr.length()); NdefRecord record = new NdefRecord(NdefRecord.TNF_WELL_KNOWN, NdefRecord.RTD_URI, new byte[0], data); return record; } /** * 写入标签 * * @param message * @param tag * @return */ public static boolean writeTag(NdefMessage message, Tag tag) { int size = message.toByteArray().length; try { Ndef ndef = Ndef.get(tag); if (ndef != null) { ndef.connect(); if (!ndef.isWritable()) { return false; } if (ndef.getMaxSize() < size) { return false; } ndef.writeNdefMessage(message); return true; } } catch (Exception e) { } return false; } }