android.nfc.tech.Ndef#isWritable

Source File: WriteUriActivity.java From android-nfc with MIT License

6 votes

/**
 * 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;
}

Source File: NfcHandler.java From PowerSwitch_Android with GNU General Public License v3.0

6 votes

/**
 * Writes an NdefMessage to a NFC tag
 */
public static void writeTag(NdefMessage message, Tag tag) throws Exception {
    int size = message.toByteArray().length;
    Ndef ndef = Ndef.get(tag);
    if (ndef != null) {
        ndef.connect();
        if (!ndef.isWritable()) {
            throw new NfcTagNotWritableException();
        }
        if (ndef.getMaxSize() < size) {
            throw new NfcTagInsufficientMemoryException(ndef.getMaxSize(), size);
        }
        ndef.writeNdefMessage(message);
    } else {
        NdefFormatable format = NdefFormatable.get(tag);
        if (format != null) {
            format.connect();
            format.format(message);
        } else {
            throw new IllegalArgumentException("Ndef format is NULL");
        }
    }
}

Source File: NFCTagReadWriteManager.java From PhoneProfilesPlus with Apache License 2.0

5 votes

private void readTagFromIntent(Intent intent) {
    if (intent != null){
        String action = intent.getAction();

        /*if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(action)) {
            uidRead = true;

            String uid = ByteArrayToHexString(intent.getByteArrayExtra(NfcAdapter.EXTRA_ID));
            onTagReadListener.onUidRead(uid);
        }*/
        if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action)) {
            tagRead = true;

            // get NDEF tag details
            Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
            if (tag != null) {
                Ndef ndefTag = Ndef.get(tag);
                //int tagSize = ndefTag.getMaxSize();         // tag size
                tagIsWritable = ndefTag.isWritable();   // is tag writable?
                //String tagType = ndefTag.getType();            // tag type

                Parcelable[] rawMessages = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
                if (rawMessages != null) {
                    NdefRecord[] records = ((NdefMessage) rawMessages[0]).getRecords();
                    String text = ndefRecordToString(records[0]);
                    onTagReadListener.onTagRead(text);
                }
            }
        }
    }
}

Source File: RunAppActivity.java From android-nfc with MIT License

4 votes

/**
 * 往标签写数据的方法
 *
 * @param tag
 */
public void writeNFCTag(Tag tag) {
    if (tag == null) {
        return;
    }
    NdefMessage ndefMessage = new NdefMessage(new NdefRecord[]{NdefRecord
            .createApplicationRecord(mPackageName)});
    //转换成字节获得大小
    int size = ndefMessage.toByteArray().length;
    try {
        //2.判断NFC标签的数据类型（通过Ndef.get方法）
        Ndef ndef = Ndef.get(tag);
        //判断是否为NDEF标签
        if (ndef != null) {
            ndef.connect();
            //判断是否支持可写
            if (!ndef.isWritable()) {
                return;
            }
            //判断标签的容量是否够用
            if (ndef.getMaxSize() < size) {
                return;
            }
            //3.写入数据
            ndef.writeNdefMessage(ndefMessage);
            Toast.makeText(this, "写入成功", Toast.LENGTH_SHORT).show();
        } else { //当我们买回来的NFC标签是没有格式化的，或者没有分区的执行此步
            //Ndef格式类
            NdefFormatable format = NdefFormatable.get(tag);
            //判断是否获得了NdefFormatable对象，有一些标签是只读的或者不允许格式化的
            if (format != null) {
                //连接
                format.connect();
                //格式化并将信息写入标签
                format.format(ndefMessage);
                Toast.makeText(this, "写入成功", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(this, "写入失败", Toast.LENGTH_SHORT).show();
            }
        }
    } catch (Exception e) {
    }
}

Source File: RunUrlActivity.java From android-nfc with MIT License

4 votes

/**
 * 往标签写数据的方法
 *
 * @param tag
 */
public void writeNFCTag(Tag tag) {
    if (tag == null) {
        return;
    }
    NdefMessage ndefMessage = new NdefMessage(new NdefRecord[]{NdefRecord
            .createUri(Uri.parse("http://www.baidu.com"))});
    //转换成字节获得大小
    int size = ndefMessage.toByteArray().length;
    try {
        //2.判断NFC标签的数据类型（通过Ndef.get方法）
        Ndef ndef = Ndef.get(tag);
        //判断是否为NDEF标签
        if (ndef != null) {
            ndef.connect();
            //判断是否支持可写
            if (!ndef.isWritable()) {
                return;
            }
            //判断标签的容量是否够用
            if (ndef.getMaxSize() < size) {
                return;
            }
            //3.写入数据
            ndef.writeNdefMessage(ndefMessage);
            Toast.makeText(this, "写入成功", Toast.LENGTH_SHORT).show();
        } else { //当我们买回来的NFC标签是没有格式化的，或者没有分区的执行此步
            //Ndef格式类
            NdefFormatable format = NdefFormatable.get(tag);
            //判断是否获得了NdefFormatable对象，有一些标签是只读的或者不允许格式化的
            if (format != null) {
                //连接
                format.connect();
                //格式化并将信息写入标签
                format.format(ndefMessage);
                Toast.makeText(this, "写入成功",
                        Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(this, "写入失败", Toast.LENGTH_SHORT).show();
            }
        }
    } catch (Exception e) {
    }
}

Source File: AppRunnerActivity.java From PHONK with GNU General Public License v3.0

4 votes

/**
 * Listen to NFC incomming data
 */
@Override
public void onNewIntent(Intent intent) {
    MLog.d(TAG, "New intent " + intent);

    if (intent.getAction() != null) {
        MLog.d(TAG, "Discovered tag with intent: " + intent);

        Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
        String nfcID = StrUtils.bytetostring(tag.getId());

        // if there is a message waiting to be written
        if (PNfc.nfcMsg != null) {
            MLog.d(TAG, "->" + PNfc.nfcMsg);
            PNfc.writeTag(this, tag, PNfc.nfcMsg);
            if (onNFCWrittenListener != null) onNFCWrittenListener.onNewTag();
            onNFCWrittenListener = null;
            PNfc.nfcMsg = null;

            // read the nfc tag info
        } else {
            // get NDEF tag details
            Ndef ndefTag = Ndef.get(tag);
            if (ndefTag == null) {
                return;
            }

            int size = ndefTag.getMaxSize(); // tag size
            boolean writable = ndefTag.isWritable(); // is tag writable?
            String type = ndefTag.getType(); // tag type

            String nfcMessage = "";

            // get NDEF message details
            NdefMessage ndefMesg = ndefTag.getCachedNdefMessage();
            if (ndefMesg != null) {
                NdefRecord[] ndefRecords = ndefMesg.getRecords();
                int len = ndefRecords.length;
                String[] recTypes = new String[len]; // will contain the
                // NDEF record types
                String[] recPayloads = new String[len]; // will contain the
                // NDEF record types
                for (int i = 0; i < len; i++) {
                    recTypes[i] = new String(ndefRecords[i].getType());
                    recPayloads[i] = new String(ndefRecords[i].getPayload());
                }
                nfcMessage = recPayloads[0];
            }
            if (onNFCListener != null) onNFCListener.onNewTag(nfcID, nfcMessage);
        }
    }
}

Java Code Examples for android.nfc.tech.Ndef#isWritable()