package com.example.readtagmsgdemo;/* * Copyright 2011, The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */import android.app.Activity;import android.app.AlertDialog;import android.app.PendingIntent;import android.content.DialogInterface;import android.content.Intent;import android.content.IntentFilter;import android.content.IntentFilter.MalformedMimeTypeException;import android.nfc.NdefMessage;import android.nfc.NdefRecord;import android.nfc.NfcAdapter;import android.nfc.Tag;import android.nfc.tech.Ndef;import android.nfc.tech.NdefFormatable;import android.os.Bundle;import android.os.Parcelable;import android.text.Editable;import android.text.TextWatcher;import android.util.Log;import android.view.View;import android.widget.EditText;import android.widget.TextView;import android.widget.Toast;import java.io.IOException;public class MainActivity extends Activity { private static final String TAG = "stickynotes"; private boolean mResumed = false; private boolean mWriteMode = false; NfcAdapter mNfcAdapter; EditText mNote; PendingIntent mNfcPendingIntent; IntentFilter[] mWriteTagFilters; IntentFilter[] mNdefExchangeFilters; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mNfcAdapter = NfcAdapter.getDefaultAdapter(this); setContentView(R.layout.activity_main); findViewById(R.id.write_tag).setOnClickListener(mTagWriter); mNote = ((EditText) findViewById(R.id.note)); mNote.addTextChangedListener(mTextWatcher); // Handle all of our received NFC intents in this activity. mNfcPendingIntent = PendingIntent.getActivity(this, 0, new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0); // Intent filters for reading a note from a tag or exchanging over p2p. IntentFilter ndefDetected = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED); try { ndefDetected.addDataType("text/plain"); } catch (MalformedMimeTypeException e) { } mNdefExchangeFilters = new IntentFilter[] { ndefDetected }; // Intent filters for writing to a tag IntentFilter tagDetected = new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED); mWriteTagFilters = new IntentFilter[] { tagDetected }; } @Override protected void onResume() { super.onResume(); mResumed = true; // Sticky notes received from Android if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(getIntent().getAction())) { NdefMessage[] messages = getNdefMessages(getIntent()); byte[] payload = messages[0].getRecords()[0].getPayload(); setNoteBody(new String(payload)); setIntent(new Intent()); // Consume this intent. } enableNdefExchangeMode(); } @Override protected void onPause() { super.onPause(); mResumed = false; mNfcAdapter.disableForegroundNdefPush(this); } @Override protected void onNewIntent(Intent intent) { // NDEF exchange mode if (!mWriteMode && NfcAdapter.ACTION_NDEF_DISCOVERED.equals(intent.getAction())) { NdefMessage[] msgs = getNdefMessages(intent); promptForContent(msgs[0]); } // Tag writing mode if (mWriteMode && NfcAdapter.ACTION_TAG_DISCOVERED.equals(intent.getAction())) { Tag detectedTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG); writeTag(getNoteAsNdef(), detectedTag); } } private TextWatcher mTextWatcher = new TextWatcher() { @Override public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) { } @Override public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) { } @Override public void afterTextChanged(Editable arg0) { if (mResumed) { mNfcAdapter.enableForegroundNdefPush(MainActivity.this, getNoteAsNdef()); } } }; private View.OnClickListener mTagWriter = new View.OnClickListener() { @Override public void onClick(View arg0) { // Write to a tag for as long as the dialog is shown. disableNdefExchangeMode(); enableTagWriteMode(); new AlertDialog.Builder(MainActivity.this).setTitle("Touch tag to write") .setOnCancelListener(new DialogInterface.OnCancelListener() { @Override public void onCancel(DialogInterface dialog) { disableTagWriteMode(); enableNdefExchangeMode(); } }).create().show(); } }; private void promptForContent(final NdefMessage msg) { String body = new String(msg.getRecords()[0].getPayload()); setNoteBody(body); } private void setNoteBody(String body) { TextView tv = (TextView)findViewById(R.id.getMsg); Editable text = mNote.getText(); text.clear(); tv.setText(body); } private NdefMessage getNoteAsNdef() { byte[] textBytes = mNote.getText().toString().getBytes(); NdefRecord textRecord = new NdefRecord(NdefRecord.TNF_MIME_MEDIA, "text/plain".getBytes(), new byte[] {}, textBytes); return new NdefMessage(new NdefRecord[] {textRecord}); //写入搜狐网zhi// NdefRecord record = new NdefRecord(NdefRecord.TNF_ABSOLUTE_URI,//"http://www.sohu.com".getBytes(Charset.forName("US-ASCII")),//new byte[0], new byte[0]);// return new NdefMessage(new NdefRecord[] {record}); } NdefMessage[] getNdefMessages(Intent intent) { // Parse the intent NdefMessage[] msgs = null; String action = intent.getAction(); if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(action) || NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action)) { Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES); if (rawMsgs != null) { msgs = new NdefMessage[rawMsgs.length]; for (int i = 0; i < rawMsgs.length; i ) { msgs[i] = (NdefMessage) rawMsgs[i]; } } else { // Unknown tag type byte[] empty = new byte[] {}; NdefRecord record = new NdefRecord(NdefRecord.TNF_UNKNOWN, empty, empty, empty); NdefMessage msg = new NdefMessage(new NdefRecord[] { record }); msgs = new NdefMessage[] { msg }; } } else { Log.d(TAG, "Unknown intent."); finish(); } return msgs; } private void enableNdefExchangeMode() { mNfcAdapter.enableForegroundNdefPush(MainActivity.this, getNoteAsNdef()); mNfcAdapter.enableForegroundDispatch(this, mNfcPendingIntent, mNdefExchangeFilters, null); } private void disableNdefExchangeMode() { mNfcAdapter.disableForegroundNdefPush(this); mNfcAdapter.disableForegroundDispatch(this); } private void enableTagWriteMode() { mWriteMode = true; IntentFilter tagDetected = new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED); mWriteTagFilters = new IntentFilter[] { tagDetected }; mNfcAdapter.enableForegroundDispatch(this, mNfcPendingIntent, mWriteTagFilters, null); } private void disableTagWriteMode() { mWriteMode = false; mNfcAdapter.disableForegroundDispatch(this); } 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()) { toast("Tag is read-only."); return false; } if (ndef.getMaxSize() < size) { toast("Tag capacity is " ndef.getMaxSize() " bytes, message is " size" bytes."); return false; } ndef.writeNdefMessage(message); toast("Wrote message to pre-formatted tag."); return true; } else { NdefFormatable format = NdefFormatable.get(tag); if (format != null) { try { format.connect(); format.format(message); toast("Formatted tag and wrote message"); return true; } catch (IOException e) { toast("Failed to format tag."); return false; } } else { toast("Tag doesn't support NDEF."); return false; } } } catch (Exception e) { toast("Failed to write tag"); } return false; } private void toast(String text) { Toast.makeText(this, text, Toast.LENGTH_SHORT).show(); }}
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