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   源码介绍

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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();
    }
}