I've built a QR code generator and a QR code scanner for passing data about phones and their users between phones (the phones are being loaned out so there will be a master phone with the scanner app and the rest with the generator app). The QR code generated is a JSON format string containing a persons name/number/imei of their phone but for security I have tried to encrypt the string before encoding to QR, but the scanned QR code throws up a 'pad block corrupted' error.
The JSON data encodes into QR/decodes from QR fine as plain text, and I checked the encryption/decryption before encoding to QR and the data encrypts/decrypts fine, so it's something to do with when the encrypted text is encoded into QR but I've no idea where to begin with it!
Does anyone know how i can sort the issue? Or if theres any QR friendly encryption methods?!!
I took the QRCodeEncoder straight from ZXings source and placed it into my activity:
/**QR ENCODER CLASS****************************************************/
public class QRCodeEncoder
{
private final String TAG = QRCodeEncoder.class.getSimpleName();
private static final int WHITE = 0xFFFFFFFF;
private static final int BLACK = 0xFF000000;
private final Activity activity;
private String contents;
private String displayContents;
private String title;
private BarcodeFormat format;
private final int dimension;
QRCodeEncoder(Activity activity, Intent intent, int dimension) {
this.activity = activity;
if (intent == null) {
throw new IllegalArgumentException("No valid data to encode. intent is null");
}
String action = intent.getAction();
if (action.equals(Intents.Encode.ACTION)) {
if (!encodeContentsFromZXingIntent(intent)) {
throw new IllegalArgumentException("No valid data to encode. Zxing intent returned false");
}
} else if (action.equals(Intent.ACTION_SEND)) {
if (!encodeContentsFromShareIntent(intent)) {
throw new IllegalArgumentException("No valid data to encode. Share Intent returned false");
}
}
this.dimension = dimension;
}
public String getContents() {
return contents;
}
public String getDisplayContents() {
return displayContents;
}
public String getTitle() {
return title;
}
// It would be nice if the string encoding lived in the core ZXing library,
// but we use platform specific code like PhoneNumberUtils, so it can't.
private boolean encodeContentsFromZXingIntent(Intent intent) {
// Default to QR_CODE if no format given.
String formatString = intent.getStringExtra(Intents.Encode.FORMAT);
try {
format = BarcodeFormat.valueOf(formatString);
} catch (IllegalArgumentException iae) {
// Ignore it then
format = null;
}
if (format == null || BarcodeFormat.QR_CODE.equals(format)) {
String type = intent.getStringExtra(Intents.Encode.TYPE);
if (type == null || type.length() == 0) {
return false;
}
this.format = BarcodeFormat.QR_CODE;
encodeQRCodeContents(intent, type);
} else {
String data = intent.getStringExtra(Intents.Encode.DATA);
if (data != null && data.length() > 0) {
contents = data;
displayContents = data;
title = "QR Encoder";
}
}
return contents != null && contents.length() > 0;
}
// Handles send intents from multitude of Android applications
private boolean encodeContentsFromShareIntent(Intent intent) {
// Check if this is a plain text encoding, or contact
if (intent.hasExtra(Intent.EXTRA_TEXT)) {
return encodeContentsFromShareIntentPlainText(intent);
}
// Attempt default sharing.
return encodeContentsFromShareIntentDefault(intent);
}
private boolean encodeContentsFromShareIntentPlainText(Intent intent) {
// Notice: Google Maps shares both URL and details in one text, bummer!
contents = intent.getStringExtra(Intent.EXTRA_TEXT);
Toast.makeText(getApplicationContext(),"contents read = "+contents,Toast.LENGTH_SHORT).show();
// We only support non-empty and non-blank texts.
// Trim text to avoid URL breaking.
if (contents == null) {
return false;
}
contents = contents.trim();
if (contents.length() == 0) {
return false;
}
// We only do QR code.
format = BarcodeFormat.QR_CODE;
if (intent.hasExtra(Intent.EXTRA_SUBJECT)) {
displayContents = intent.getStringExtra(Intent.EXTRA_SUBJECT);
} else if (intent.hasExtra(Intent.EXTRA_TITLE)) {
displayContents = intent.getStringExtra(Intent.EXTRA_TITLE);
} else {
displayContents = contents;
}
title = "QR Encoder";
return true;
}
// Handles send intents from the Contacts app, retrieving a contact as a VCARD.
// Note: Does not work on HTC devices due to broken custom Contacts application.
private boolean encodeContentsFromShareIntentDefault(Intent intent) {
format = BarcodeFormat.QR_CODE;
try {
Uri uri = (Uri)intent.getExtras().getParcelable(Intent.EXTRA_STREAM);
InputStream stream = activity.getContentResolver().openInputStream(uri);
int length = stream.available();
if (length <= 0) {
Log.w(TAG, "Content stream is empty");
return false;
}
byte[] vcard = new byte[length];
int bytesRead = stream.read(vcard, 0, length);
if (bytesRead < length) {
Log.w(TAG, "Unable to fully read available bytes from content stream");
return false;
}
String vcardString = new String(vcard, 0, bytesRead, "UTF-8");
Log.d(TAG, "Encoding share intent content:");
Log.d(TAG, vcardString);
Result result = new Result(vcardString, vcard, null, BarcodeFormat.QR_CODE);
ParsedResult parsedResult = ResultParser.parseResult(result);
if (!(parsedResult instanceof AddressBookParsedResult)) {
Log.d(TAG, "Result was not an address");
return false;
}
if (!encodeQRCodeContents((AddressBookParsedResult) parsedResult)) {
Log.d(TAG, "Unable to encode contents");
return false;
}
} catch (IOException e) {
Log.w(TAG, e);
return false;
} catch (NullPointerException e) {
Log.w(TAG, e);
// In case the uri was not found in the Intent.
return false;
}
return contents != null && contents.length() > 0;
}
private void encodeQRCodeContents(Intent intent, String type) {
if (type.equals(Contents.Type.TEXT)) {
String data = intent.getStringExtra(Intents.Encode.DATA);
if (data != null && data.length() > 0) {
contents = data;
displayContents = data;
title = "QR Encoder";
}
} else if (type.equals(Contents.Type.EMAIL)) {
String data = trim(intent.getStringExtra(Intents.Encode.DATA));
if (data != null) {
contents = "mailto:" + data;
displayContents = data;
title = "QR Encoder";
}
} else if (type.equals(Contents.Type.PHONE)) {
String data = trim(intent.getStringExtra(Intents.Encode.DATA));
if (data != null) {
contents = "tel:" + data;
displayContents = PhoneNumberUtils.formatNumber(data);
title = "QR Encoder";
}
} else if (type.equals(Contents.Type.SMS)) {
String data = trim(intent.getStringExtra(Intents.Encode.DATA));
if (data != null) {
contents = "sms:" + data;
displayContents = PhoneNumberUtils.formatNumber(data);
title = "QR Encoder";
}
} else if (type.equals(Contents.Type.CONTACT)) {
Bundle bundle = intent.getBundleExtra(Intents.Encode.DATA);
if (bundle != null) {
StringBuilder newContents = new StringBuilder(100);
StringBuilder newDisplayContents = new StringBuilder(100);
newContents.append("MECARD:");
String name = trim(bundle.getString(Contacts.Intents.Insert.NAME));
if (name != null) {
newContents.append("N:").append(escapeMECARD(name)).append(';');
newDisplayContents.append(name);
}
String address = trim(bundle.getString(Contacts.Intents.Insert.POSTAL));
if (address != null) {
newContents.append("ADR:").append(escapeMECARD(address)).append(';');
newDisplayContents.append('\n').append(address);
}
for (int x = 0; x < Contents.PHONE_KEYS.length; x++) {
String phone = trim(bundle.getString(Contents.PHONE_KEYS[x]));
if (phone != null) {
newContents.append("TEL:").append(escapeMECARD(phone)).append(';');
newDisplayContents.append('\n').append(PhoneNumberUtils.formatNumber(phone));
}
}
for (int x = 0; x < Contents.EMAIL_KEYS.length; x++) {
String email = trim(bundle.getString(Contents.EMAIL_KEYS[x]));
if (email != null) {
newContents.append("EMAIL:").append(escapeMECARD(email)).append(';');
newDisplayContents.append('\n').append(email);
}
}
// Make sure we've encoded at least one field.
if (newDisplayContents.length() > 0) {
newContents.append(';');
contents = newContents.toString();
displayContents = newDisplayContents.toString();
title = "QR Encoder";
} else {
contents = null;
displayContents = null;
}
}
} else if (type.equals(Contents.Type.LOCATION)) {
Bundle bundle = intent.getBundleExtra(Intents.Encode.DATA);
if (bundle != null) {
// These must use Bundle.getFloat(), not getDouble(), it's part of the API.
float latitude = bundle.getFloat("LAT", Float.MAX_VALUE);
float longitude = bundle.getFloat("LONG", Float.MAX_VALUE);
if (latitude != Float.MAX_VALUE && longitude != Float.MAX_VALUE) {
contents = "geo:" + latitude + ',' + longitude;
displayContents = latitude + "," + longitude;
title = "QR Encoder";
}
}
}
}
private boolean encodeQRCodeContents(AddressBookParsedResult contact) {
StringBuilder newContents = new StringBuilder(100);
StringBuilder newDisplayContents = new StringBuilder(100);
newContents.append("MECARD:");
String[] names = contact.getNames();
if (names != null && names.length > 0) {
String name = trim(names[0]);
if (name != null) {
newContents.append("N:").append(escapeMECARD(name)).append(';');
newDisplayContents.append(name);
}
}
String[] addresses = contact.getAddresses();
if (addresses != null) {
for (String address : addresses) {
address = trim(address);
if (address != null) {
newContents.append("ADR:").append(escapeMECARD(address)).append(';');
newDisplayContents.append('\n').append(address);
}
}
}
String[] phoneNumbers = contact.getPhoneNumbers();
if (phoneNumbers != null) {
for (String phone : phoneNumbers) {
phone = trim(phone);
if (phone != null) {
newContents.append("TEL:").append(escapeMECARD(phone)).append(';');
newDisplayContents.append('\n').append(PhoneNumberUtils.formatNumber(phone));
}
}
}
String[] emails = contact.getEmails();
if (emails != null) {
for (String email : emails) {
email = trim(email);
if (email != null) {
newContents.append("EMAIL:").append(escapeMECARD(email)).append(';');
newDisplayContents.append('\n').append(email);
}
}
}
String url = trim(contact.getURL());
if (url != null) {
newContents.append("URL:").append(escapeMECARD(url)).append(';');
newDisplayContents.append('\n').append(url);
}
// Make sure we've encoded at least one field.
if (newDisplayContents.length() > 0) {
newContents.append(';');
contents = newContents.toString();
displayContents = newDisplayContents.toString();
title = "QR Encoder";
return true;
} else {
contents = null;
displayContents = null;
return false;
}
}
Bitmap encodeAsBitmap() throws WriterException {
Hashtable<EncodeHintType,Object> hints = null;
String encoding = guessAppropriateEncoding(contents);
if (encoding != null) {
hints = new Hashtable<EncodeHintType,Object>(2);
hints.put(EncodeHintType.CHARACTER_SET, encoding);
}
MultiFormatWriter writer = new MultiFormatWriter();
BitMatrix result = writer.encode(contents, format, dimension, dimension, hints);
int width = result.getWidth();
int height = result.getHeight();
int[] pixels = new int[width * height];
// All are 0, or black, by default
for (int y = 0; y < height; y++) {
int offset = y * width;
for (int x = 0; x < width; x++) {
pixels[offset + x] = result.get(x, y) ? BLACK : WHITE;
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}
private String guessAppropriateEncoding(CharSequence contents) {
// Very crude at the moment
for (int i = 0; i < contents.length(); i++) {
if (contents.charAt(i) > 0xFF) {
return "UTF-8";
}
}
return null;
}
private String trim(String s) {
if (s == null) {
return null;
}
s = s.trim();
return s.length() == 0 ? null : s;
}
private String escapeMECARD(String input) {
if (input == null || (input.indexOf(':') < 0 && input.indexOf(';') < 0)) {
return input;
}
int length = input.length();
StringBuilder result = new StringBuilder(length);
for (int i = 0; i < length; i++) {
char c = input.charAt(i);
if (c == ':' || c == ';') {
result.append('\\');
}
result.append(c);
}
return result.toString();
}
}
And the encryption/decryption class from this website (unedited)
Here's a snippet of the onCreate() method in my activity:
QRCodeEncoder myQRCodeEncoder;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.qr_view);
ImageView imageView = (ImageView)findViewById(R.id.qr_image);
extStorageDirectory = Environment.getExternalStorageDirectory().toString();
try
{
//JSON data is passed from another activity to this one
qrMessage = getIntent().getStringExtra("QR_JSON");
Intent encode = new Intent(Intents.Encode.ACTION);
encode.putExtra(Intents.Encode.TYPE, Contents.Type.TEXT);
encode.putExtra(Intents.Encode.FORMAT, "QR_CODE");
//This is the original plain text way that works:
//encode.putExtra(Intents.Encode.DATA, qrMessage);
//This is the encyption way
String encMessage = SimpleCrypto.encrypt("my s3cr3t k3y", qrMessage);
encode.putExtra(Intents.Encode.DATA,encMessage);
myQRCodeEncoder = new QRCodeEncoder(this, encode, 200);
}
catch(Exception e)
{
Toast.makeText(getApplicationContext(),"Could not encode:"+e.getMessage(),Toast.LENGTH_SHORT).show();
}
catch(Error e)
{
Toast.makeText(getApplicationContext(),"Could not encode:"+e.getMessage(),Toast.LENGTH_SHORT).show();
}
try {
Bitmap qrBitmap = myQRCodeEncoder.encodeAsBitmap();
imageView.setImageBitmap(qrBitmap);
} catch (Exception e) {
Toast.makeText(getApplicationContext(),"Could not set image:"+e.getMessage(),Toast.LENGTH_SHORT).show();
}
}
And here's the onActivityResult method from the scanner (I use ZXing's barcode scanner to retrieve the data)
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
if (requestCode == 0) {
if (resultCode == RESULT_OK) {
String contents = intent.getStringExtra("SCAN_RESULT");//contents of the scan
String format = intent.getStringExtra("SCAN_RESULT_FORMAT");
// Handle successful scan
/* display the scanned persons info*/
try {
String decryptedcontents = SimpleCrypto.decrypt("my s3cr3t k3y",contents);
String result = getJSONFromScanData(decryptedcontents);
} catch (Exception e) {
// TODO Auto-generated catch block
Toast.makeText(this, "Scanned data could not be decrypted:"+e.getMessage(), Toast.LENGTH_SHORT).show();//says 'pad block corrupted' as the message
}
} else if (resultCode == RESULT_CANCELED) {
// Handle cancel
Toast.makeText(this, "Scan cancelled", Toast.LENGTH_SHORT).show();
}
}
}
EDIT: after some further investigation it seems that the encyption/decyption process seems to 'shave off' part of the data:
JSONObject example = new JSONObject("{\"user_firstname\":\"Ben\",\"user_lastname\":\" Ten\",\"user_login\":\"benten\",\"user_pass\":\"password\",\"user_email\":\"benten#domain.com\"}");
String mess = SimpleCrypto.encrypt("my s3cr3t k3y",example.toString());
String decrmess = SimpleCrypto.decrypt("my s3cr3t k3y",mess));
//decypts as:{"user_pass":"password","user_email":"benten#domain.com","user_login":"benten","user_lastname":"
as you can see only 96 characters are decrypted, theres no user_firstname or the users actual last name, the data is missing, but this number is inconsistent, I changed the user_email to "benbenten#domain.com" and the user_firstname to "benben" and 112 characters were decrypted...I am completely stumped
EDIT 2: Yngve Ådlandsvik has kindly pointed me in the right direction (many thanks again!) that the string length needed to be a multiple of 16, so I set the Cipher.getInstance in both the encrypt and decrypt methods to:
Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding","BC");
and in my main activity set a loop to add 0's on the end of my string as custom padding before encrypting:
boolean carryOn = true;
while(carryOn)
{
int paddedLength = qrMessage.getBytes().length;
int checkMultiple16 = paddedLength%16;
if(checkMultiple16==0)
{
carryOn = false;
}
else
qrMessage+="0";
}
EDIT 3: It looks like QR encoding still screws with the encryption, I can't decrypt the scanned in data properly, looks like QR encoding does something with strings before it encodes to QR which seems to break the thing, guess I'll have to stick to unencrypted text in the QR...
I haven't read the code closely, but I assume this happens because AES only operates on blocks of 16 bytes at once. So my guess is you need to manually apply some form of reversible padding to your string before encryption so it becomes a multiple of 16, and then reverse the padding after decryption.
You could also change the Cipher.getInstance() strings in the crypto code so the encryption will support padding natively, though I don't know which padding types and cipher modes are available on Android.
Related
I have a program in which I'm trying to download the content of an image file from a server. I'm using java socket to download it. After downloading, I use BitmapFactory.decodeByteArray() to create a bitmap.
At the server side, the file is a .jpg file and it's only about 180 KBytes, so I don't need to try scaling it. I can see through logs that the exact number of bytes in the file is received by my image download code. I store all the bytes in a byte[] array and then convert it into a bitmap.
The imageView is initially hidden and then supposed to be made visible after populating the image. But using BitmapFactory.decodeByteArray() is returning null always. I did see some other posts about null bitmap, but nothing seems to have an answer for this problem.
I don't want to use any external library just for this, so please do not give me suggestions to try out some other libraries. Can someone spot any problem with the code? The server side program is also mine and I know that part is correct because using that, browsers are able to download the same image file. I have copy-pasted it below.
public class ImageDownloader {
private Socket sockToSrvr;
private PrintWriter strmToSrvr;
private BufferedInputStream strmFromSrvr;
private String srvrAddr;
private int port;
private String remoteFile;
private Context ctxt;
private Bitmap imgBmap;
private View parkSpotImgVwHldr;
private View mngAndFndVwHldr;
private View parkSpotImgVw;
public ImageDownloader(Context c) {
srvrAddr = KloudSrvr.srvrIp();
port = KloudSrvr.port();
sockToSrvr = null;
strmFromSrvr = null;
strmToSrvr = null;
remoteFile = null;
ctxt = c;
imgBmap = null;
parkSpotImgVwHldr = null;
mngAndFndVwHldr = null;
parkSpotImgVw = null;
}
public void downloadFile(String remf, View parkSpotImgVwHldrVal,
View mngAndFndVwHldrVal, View parkSpotImgVwVal) {
remoteFile = remf;
parkSpotImgVwHldr = parkSpotImgVwHldrVal;
mngAndFndVwHldr = mngAndFndVwHldrVal;
parkSpotImgVw = parkSpotImgVwVal;
Thread dwnThrd = new Thread() {
#Override
public void run() {
imgBmap = null;
openServerConnection(); sendReq(); doDownload(); closeServerConnection();
((Activity)ctxt).runOnUiThread(new Runnable() {
public void run() {
((Activity)ctxt).runOnUiThread(new Runnable() {
public void run() {
mngAndFndVwHldr.setVisibility(View.GONE);
parkSpotImgVwHldr.setVisibility(View.VISIBLE);
Toast.makeText(ctxt, "completed", Toast.LENGTH_LONG).show();
}
});
}
});
}
};
dwnThrd.start();
}
private void sendReq() {
if(strmToSrvr == null) return;
String req = "GET /downloadFile " + remoteFile + " HTTP/1.1\r\n\r\n";
Log.d("IMG-DWNL-LOG: ", "writing req msg to socket " + req);
strmToSrvr.write(req); strmToSrvr.flush();
}
private void doDownload() {
boolean gotContLen = false;
int contLen = 0;
while(true) {
String inLine = getLine(strmFromSrvr); if(inLine == null) break;
if((gotContLen == true) &&
(inLine.replace("\r", "").replace("\n", "").isEmpty() == true)) break;
if(inLine.trim().startsWith("Content-Length:") == true) {
// an empty line after this signifies start of content
String s = inLine.replace("Content-Length:", "").trim();
try {contLen = Integer.valueOf(s); gotContLen = true; continue;}
catch(NumberFormatException nfe) {contLen = 0;}
}
}
if((gotContLen == false) || (contLen <= 0)) return;
byte[] imgByts = new byte[contLen];
int totRdByts = 0, rdByts, chnk = 1024, avlByts;
while(true) {
try {
avlByts = strmFromSrvr.available(); if(avlByts < 0) break;
if(avlByts == 0) {try {Thread.sleep(1000);} catch(InterruptedException ie) {} continue;}
rdByts = (avlByts < chnk) ? avlByts : chnk;
rdByts = strmFromSrvr.read(imgByts, totRdByts, rdByts); if(rdByts < 0) break;
if(rdByts == 0) {try {Thread.sleep(1000);} catch(InterruptedException ie) {} continue;}
totRdByts += rdByts;
if(totRdByts >= contLen) break;
} catch(IOException ioe) {return;}
}
if(totRdByts < contLen) {
Log.d("IMG-DWNL-LOG: ", "error - bytes read " + totRdByts
+ " less than content length " + contLen);
return;
}
if(totRdByts <= 0) return;
Log.d("IMG-DWNL-LOG: ", "read all image bytes successfully, setting image into view");
BitmapFactory.Options options = new BitmapFactory.Options();
Bitmap bitmap = BitmapFactory.decodeByteArray(imgByts, 0, contLen, options);
if(bitmap == null) {Log.d("IMG-DWNL-LOG: ", "got a null bitmap");}
((ImageView)parkSpotImgVw).setImageBitmap(bitmap);
}
private void closeServerConnection() {
if(sockToSrvr == null) return;
if(strmFromSrvr != null) {
try {strmFromSrvr.close();}
catch(IOException e) {Log.d("IMG-DWNL-LOG: ", "Inp strm close exception");}
}
if(strmToSrvr != null) strmToSrvr.close();
try {sockToSrvr.close();}
catch(IOException e) {Log.d("IMG-DWNL-LOG: ", "Conn close exception");}
strmFromSrvr = null; strmToSrvr = null; sockToSrvr = null;
}
private void openServerConnection() {
try {sockToSrvr = new Socket(InetAddress.getByName(srvrAddr), port);}
catch(UnknownHostException e) {
Log.d("IMG-DWNL-LOG: ", "Unknown host exception"); sockToSrvr = null; return;
} catch(IOException e) {
Log.d("IMG-DWNL-LOG: ", "Server connect exception"); sockToSrvr = null; return;
}
Log.d("IMG-DWNL-LOG: ", "Connected to server");
try {
strmFromSrvr = new BufferedInputStream(sockToSrvr.getInputStream());
strmToSrvr = new PrintWriter(new BufferedWriter(new OutputStreamWriter
(sockToSrvr.getOutputStream())), true);
} catch(IOException e) {
closeServerConnection();
Log.d("IMG-DWNL-LOG: ", "Failed to open reader / writer. Closed the connection."); return;
}
}
private String getLine(BufferedInputStream dis) {
String outLine = "";
while(true) {
try {
int c = dis.read(); if((c == -1) && (outLine.length() <= 0)) return(null);
outLine += Character.toString((char)c);
if(c == '\n') return(outLine);
} catch(IOException e) {if(outLine.length() <= 0) return(null); return(outLine);}
}
}
}
I was making a mistake, assuming that a .jpg file's bytes can be directly decode with the android bitmap decoder. Apparently this is not the case. So, I wrote the received bytes into a temporary file in the phone storage and then called BitmapFactory.decodeFile() which is able to return a good bitmap and ends up showing the image.
So, have a working solution now.
Still - if anyone has a better suggestion how to decode directly from the received bytes (which are from a .jpg file), I would be very interested to try it out since that would be more efficient. Thanks.
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Please be advised I am a total novice at Android development, and have only progressed as far as "Hello world".
I don't actually want to build a QR code scanner, I would rather use a third party component, but I need an app that will scan a QR code, display some data from the code, and send some data to a web service.
Please can someone give me a real beginner's outline on the process and structure U should use in my application. I am an experienced C# developer, so the actual Java coding won't be a problem, and I'm certainly not asking how to do that, just how to set up the basic app architecture and process flow, e.g. how to show a dialogue, contact a web service, and use a third party component.
What I need is to scan a QR code, extract some text code from it, send those codes to a web service.
ZXing is a pretty good library which you can integrate in your application.Refer this class CaptureActivity
first you need zxing library for creating QR Codes and an installed application for reading QR codes like BarcodeScanner and a Encoder class like:
import java.util.Collection;
import java.util.HashSet;
import java.util.Hashtable;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.telephony.PhoneNumberUtils;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.ByteMatrix;
public final class QRCodeEncoder {
private static final int WHITE = 0xFFFFFFFF;
private static final int BLACK = 0xFF000000;
private int dimension = Integer.MIN_VALUE;
private String contents = null;
private String displayContents = null;
private String title = null;
private BarcodeFormat format = null;
private boolean encoded = false;
public QRCodeEncoder(String data, Bundle bundle, String type, String format, int dimension) {
this.dimension = dimension;
encoded = encodeContents(data, bundle, type, format);
}
public String getContents() {
return contents;
}
public String getDisplayContents() {
return displayContents;
}
public String getTitle() {
return title;
}
private boolean encodeContents(String data, Bundle bundle, String type, String formatString) {
// Default to QR_CODE if no format given.
format = null;
if (formatString != null) {
try {
format = BarcodeFormat.valueOf(formatString);
} catch (IllegalArgumentException iae) {
// Ignore it then
}
}
if (format == null || format == BarcodeFormat.QR_CODE) {
this.format = BarcodeFormat.QR_CODE;
encodeQRCodeContents(data, bundle, type);
} else if (data != null && data.length() > 0) {
contents = data;
displayContents = data;
title = "Text";
}
return contents != null && contents.length() > 0;
}
private void encodeQRCodeContents(String data, Bundle bundle, String type) {
if (type.equals(Contents.Type.TEXT)) {
if (data != null && data.length() > 0) {
contents = data;
displayContents = data;
title = "Text";
}
} else if (type.equals(Contents.Type.EMAIL)) {
data = trim(data);
if (data != null) {
contents = "mailto:" + data;
displayContents = data;
title = "E-Mail";
}
} else if (type.equals(Contents.Type.PHONE)) {
data = trim(data);
if (data != null) {
contents = "tel:" + data;
displayContents = PhoneNumberUtils.formatNumber(data);
title = "Phone";
}
} else if (type.equals(Contents.Type.SMS)) {
data = trim(data);
if (data != null) {
contents = "sms:" + data;
displayContents = PhoneNumberUtils.formatNumber(data);
title = "SMS";
}
} else if (type.equals(Contents.Type.CONTACT)) {
if (bundle != null) {
StringBuilder newContents = new StringBuilder(100);
StringBuilder newDisplayContents = new StringBuilder(100);
newContents.append("MECARD:");
String name = trim(bundle.getString(ContactsContract.Intents.Insert.NAME));
if (name != null) {
newContents.append("N:").append(escapeMECARD(name)).append(';');
newDisplayContents.append(name);
}
String address = trim(bundle.getString(ContactsContract.Intents.Insert.POSTAL));
if (address != null) {
newContents.append("ADR:").append(escapeMECARD(address)).append(';');
newDisplayContents.append('\n').append(address);
}
Collection<String> uniquePhones = new HashSet<String>(Contents.PHONE_KEYS.length);
for (int x = 0; x < Contents.PHONE_KEYS.length; x++) {
String phone = trim(bundle.getString(Contents.PHONE_KEYS[x]));
if (phone != null) {
uniquePhones.add(phone);
}
}
for (String phone : uniquePhones) {
newContents.append("TEL:").append(escapeMECARD(phone)).append(';');
newDisplayContents.append('\n').append(PhoneNumberUtils.formatNumber(phone));
}
Collection<String> uniqueEmails = new HashSet<String>(Contents.EMAIL_KEYS.length);
for (int x = 0; x < Contents.EMAIL_KEYS.length; x++) {
String email = trim(bundle.getString(Contents.EMAIL_KEYS[x]));
if (email != null) {
uniqueEmails.add(email);
}
}
for (String email : uniqueEmails) {
newContents.append("EMAIL:").append(escapeMECARD(email)).append(';');
newDisplayContents.append('\n').append(email);
}
String url = trim(bundle.getString(Contents.URL_KEY));
if (url != null) {
// escapeMECARD(url) -> wrong escape e.g. http\://zxing.google.com
newContents.append("URL:").append(url).append(';');
newDisplayContents.append('\n').append(url);
}
String note = trim(bundle.getString(Contents.NOTE_KEY));
if (note != null) {
newContents.append("NOTE:").append(escapeMECARD(note)).append(';');
newDisplayContents.append('\n').append(note);
}
// Make sure we've encoded at least one field.
if (newDisplayContents.length() > 0) {
newContents.append(';');
contents = newContents.toString();
displayContents = newDisplayContents.toString();
title = "Contact";
} else {
contents = null;
displayContents = null;
}
}
} else if (type.equals(Contents.Type.LOCATION)) {
if (bundle != null) {
// These must use Bundle.getFloat(), not getDouble(), it's part of the API.
float latitude = bundle.getFloat("LAT", Float.MAX_VALUE);
float longitude = bundle.getFloat("LONG", Float.MAX_VALUE);
if (latitude != Float.MAX_VALUE && longitude != Float.MAX_VALUE) {
contents = "geo:" + latitude + ',' + longitude;
displayContents = latitude + "," + longitude;
title = "Location";
}
}
}
}
public Bitmap encodeAsBitmap() throws WriterException {
if (!encoded) return null;
Hashtable hints = null;
String encoding = guessAppropriateEncoding(contents);
if (encoding != null) {
hints = new Hashtable();
hints.put(EncodeHintType.CHARACTER_SET, encoding);
}
MultiFormatWriter writer = new MultiFormatWriter();
ByteMatrix result =writer.encode(contents, format, dimension, dimension, hints);
int width = result.getWidth();
int height =result.getHeight();
int[] pixels = new int[width * height];
// All are 0, or black, by default
for (int y = 0; y < height; y++) {
int offset = y * width;
for (int x = 0; x < width; x++) {
if(result.get(x, y)== 0)
{
pixels[offset + x] = BLACK ;
}
else
pixels[offset + x] = WHITE ;
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}
private static String guessAppropriateEncoding(CharSequence contents) {
// Very crude at the moment
for (int i = 0; i < contents.length(); i++) {
if (contents.charAt(i) > 0xFF) { return "UTF-8"; }
}
return null;
}
private static String trim(String s) {
if (s == null) { return null; }
String result = s.trim();
return result.length() == 0 ? null : result;
}
private static String escapeMECARD(String input) {
if (input == null || (input.indexOf(':') < 0 && input.indexOf(';') < 0)) { return input; }
int length = input.length();
StringBuilder result = new StringBuilder(length);
for (int i = 0; i < length; i++) {
char c = input.charAt(i);
if (c == ':' || c == ';') {
result.append('\\');
}
result.append(c);
}
return result.toString();
}
}
hope this help you:)
You can also consider using manateework sdk which is very fast, cost effective. I has SDK available for mobile applications which supports different platform ie. iOS, Android etc and code symbology. Pl. refer to https://manateeworks.com/ for more details on this sdk
I am trying to create a text to QR code converter.
I used the core2.2.jar from http://code.google.com/p/zxing/downloads/list and the code as told in Integrating the ZXing library directly into my Android application.
My Main.Activity is as shown below
package com.example.qr_androidone;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.WriterException;
import android.os.Bundle;
import android.app.Activity;
import android.graphics.Bitmap;
import android.view.Menu;
import android.widget.ImageView;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
//super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main);
ImageView imageView = (ImageView) findViewById(R.id.qrCode);
String qrData = "Data I want to encode in QR code";
int qrCodeDimention = 500;
QRCodeEncoder qrCodeEncoder = new QRCodeEncoder(qrData, null,
Contents.Type.TEXT, BarcodeFormat.QR_CODE.toString(), qrCodeDimention);
try {
Bitmap bitmap = qrCodeEncoder.encodeAsBitmap();
imageView.setImageBitmap(bitmap);
} catch (WriterException e) {
e.printStackTrace();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
I used the "Contents.java" and "QRCodeEncoder.java" as shown in link Integrating the ZXing library directly into my Android application. I changed "activity_main.xml" also , as shown in above link
There are no errors in compiling, but there is error when the app runs
Could not find class 'com.google.zxing.EncodeHintType', referenced
from method com.example.qr_androidone.QRCodeEncoder.encodeAsBitmap
Could not find class 'com.google.zxing.MultiFormatWriter', referenced
from method com.example.qr_androidone.QRCodeEncoder.encodeAsBitmap
java.lang.NoClassDefFoundError: com.google.zxing.BarcodeFormat
Please help me solve the error
Download de JAR file, go to your Build Path and Import it from External JARs.
http://repo1.maven.org/maven2/com/google/zxing/core/2.2/
Then import it in your project.
you need the class of QRCodeEncoder.java..
public class QRCodeEncoder {
private static final int WHITE = 0xFFFFFFFF;
private static final int BLACK = 0xFF000000;
// private int dimension = Integer.MAX_VALUE;
private String contents = null;
private String displayContents = null;
private String title = null;
private BarcodeFormat format = null;
private boolean encoded = false;
public QRCodeEncoder(String data, Bundle bundle, String type, String format) {
// this.dimension = dimension;
encoded = encodeContents(data, bundle, type, format);
}
public String getContents() {
return contents;
}
public String getDisplayContents() {
return displayContents;
}
public String getTitle() {
return title;
}
private boolean encodeContents(String data, Bundle bundle, String type, String formatString) {
// Default to QR_CODE if no format given.
format = null;
if (formatString != null) {
try {
format = BarcodeFormat.valueOf(formatString);
} catch (IllegalArgumentException iae) {
// Ignore it then
}
}
if (format == null || format == BarcodeFormat.QR_CODE) {
this.format = BarcodeFormat.QR_CODE;
encodeQRCodeContents(data, bundle, type);
} else if (data != null && data.length() > 0) {
contents = data;
displayContents = data;
title = "Text";
}
return contents != null && contents.length() > 0;
}
private void encodeQRCodeContents(String data, Bundle bundle, String type) {
if (type.equals(Contents.Type.TEXT)) {
if (data != null && data.length() > 0) {
contents = data;
displayContents = data;
title = "Text";
}
} else if (type.equals(Contents.Type.EMAIL)) {
data = trim(data);
if (data != null) {
contents = "mailto:" + data;
displayContents = data;
title = "E-Mail";
}
} else if (type.equals(Contents.Type.PHONE)) {
data = trim(data);
if (data != null) {
contents = "tel:" + data;
displayContents = PhoneNumberUtils.formatNumber(data);
title = "Phone";
}
} else if (type.equals(Contents.Type.SMS)) {
data = trim(data);
if (data != null) {
contents = "sms:" + data;
displayContents = PhoneNumberUtils.formatNumber(data);
title = "SMS";
}
} else if (type.equals(Contents.Type.CONTACT)) {
if (bundle != null) {
StringBuilder newContents = new StringBuilder(100);
StringBuilder newDisplayContents = new StringBuilder(100);
newContents.append("MECARD:");
String name = trim(bundle.getString(ContactsContract.Intents.Insert.NAME));
if (name != null) {
newContents.append("N:").append(escapeMECARD(name)).append(';');
newDisplayContents.append(name);
}
String address = trim(bundle.getString(ContactsContract.Intents.Insert.POSTAL));
if (address != null) {
newContents.append("ADR:").append(escapeMECARD(address)).append(';');
newDisplayContents.append('\n').append(address);
}
Collection<String> uniquePhones = new HashSet<String>(Contents.PHONE_KEYS.length);
for (int x = 0; x < Contents.PHONE_KEYS.length; x++) {
String phone = trim(bundle.getString(Contents.PHONE_KEYS[x]));
if (phone != null) {
uniquePhones.add(phone);
}
}
for (String phone : uniquePhones) {
newContents.append("TEL:").append(escapeMECARD(phone)).append(';');
newDisplayContents.append('\n').append(PhoneNumberUtils.formatNumber(phone));
}
Collection<String> uniqueEmails = new HashSet<String>(Contents.EMAIL_KEYS.length);
for (int x = 0; x < Contents.EMAIL_KEYS.length; x++) {
String email = trim(bundle.getString(Contents.EMAIL_KEYS[x]));
if (email != null) {
uniqueEmails.add(email);
}
}
for (String email : uniqueEmails) {
newContents.append("EMAIL:").append(escapeMECARD(email)).append(';');
newDisplayContents.append('\n').append(email);
}
String url = trim(bundle.getString(Contents.URL_KEY));
if (url != null) {
// escapeMECARD(url) -> wrong escape e.g. http\://zxing.google.com
newContents.append("URL:").append(url).append(';');
newDisplayContents.append('\n').append(url);
}
String note = trim(bundle.getString(Contents.NOTE_KEY));
if (note != null) {
newContents.append("NOTE:").append(escapeMECARD(note)).append(';');
newDisplayContents.append('\n').append(note);
}
// Make sure we've encoded at least one field.
if (newDisplayContents.length() > 0) {
newContents.append(';');
contents = newContents.toString();
displayContents = newDisplayContents.toString();
title = "Contact";
} else {
contents = null;
displayContents = null;
}
}
} else if (type.equals(Contents.Type.LOCATION)) {
if (bundle != null) {
float latitude = bundle.getFloat("LAT", Float.MAX_VALUE);
float longitude = bundle.getFloat("LONG", Float.MAX_VALUE);
if (latitude != Float.MAX_VALUE && longitude != Float.MAX_VALUE) {
contents = "geo:" + latitude + ',' + longitude;
displayContents = latitude + "," + longitude;
title = "Location";
}
}
}
}
public Bitmap encodeAsBitmap() throws WriterException {
if (!encoded) return null;
Hashtable<EncodeHintType, String> hints = null;
String encoding = guessAppropriateEncoding(contents);
if (encoding != null) {
hints = new Hashtable<EncodeHintType, String>();
hints.put(EncodeHintType.CHARACTER_SET, encoding);
}
MultiFormatWriter writer = new MultiFormatWriter();
BitMatrix result =writer.encode(contents, format, 300, 300, hints);
int width = result.getWidth();
int height =result.getHeight();
int[] pixels = new int[width * height];
// All are 0, or black, by default
for (int y = 0; y < height; y++) {
int offset = y * width;
for (int x = 0; x < width; x++) {
if(result.get(x, y) )
{
pixels[offset + x] = BLACK ;
}
else
pixels[offset + x] = WHITE ;
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}
private static String guessAppropriateEncoding(CharSequence contents) {
// Very crude at the moment
for (int i = 0; i < contents.length(); i++) {
if (contents.charAt(i) > 0xFF) { return "UTF-8"; }
}
return null;
}
private static String trim(String s) {
if (s == null) { return null; }
String result = s.trim();
return result.length() == 0 ? null : result;
}
private static String escapeMECARD(String input) {
if (input == null || (input.indexOf(':') < 0 && input.indexOf(';') < 0)) { return input; }
int length = input.length();
StringBuilder result = new StringBuilder(length);
for (int i = 0; i < length; i++) {
char c = input.charAt(i);
if (c == ':' || c == ';') {
result.append('\\');
}
result.append(c);
}
return result.toString();
}
}
and also need content.java class..
public class Contents {
private Contents() {
}
public static final class Type {
public static final String TEXT = "TEXT_TYPE";
public static final String EMAIL = "EMAIL_TYPE";
public static final String PHONE = "PHONE_TYPE";
public static final String SMS = "SMS_TYPE";
public static final String CONTACT = "CONTACT_TYPE";
public static final String LOCATION = "LOCATION_TYPE";
private Type() {
}
}
public static final String URL_KEY = "URL_KEY";
public static final String NOTE_KEY = "NOTE_KEY";
public static final String[] PHONE_KEYS = {
ContactsContract.Intents.Insert.PHONE, ContactsContract.Intents.Insert.SECONDARY_PHONE,
ContactsContract.Intents.Insert.TERTIARY_PHONE
};
public static final String[] PHONE_TYPE_KEYS = {
ContactsContract.Intents.Insert.PHONE_TYPE,
ContactsContract.Intents.Insert.SECONDARY_PHONE_TYPE,
ContactsContract.Intents.Insert.TERTIARY_PHONE_TYPE
};
public static final String[] EMAIL_KEYS = {
ContactsContract.Intents.Insert.EMAIL, ContactsContract.Intents.Insert.SECONDARY_EMAIL,
ContactsContract.Intents.Insert.TERTIARY_EMAIL
};
public static final String[] EMAIL_TYPE_KEYS = {
ContactsContract.Intents.Insert.EMAIL_TYPE,
ContactsContract.Intents.Insert.SECONDARY_EMAIL_TYPE,
ContactsContract.Intents.Insert.TERTIARY_EMAIL_TYPE
};
}
also need the core.jar file..
its perfectly work...
I have an email project in Android and I can receive and download my mails and its attachments but now I want to learn if a message has an attachment or not, and how many attachments it has got.
I mean I just need to do an if clause like:
if(messages[i].hasAttachment)
{
int numberOfAttachments = messages[i].attachmentNumber;
// do smthng
}
else
{
// do smthng
}
Maybe its help: I am receiving my body part with this code sample. Meanwhile, as per my subject, if the isMimeType = "Multipart/alternative" or "Multipart/*" , does it mean it has an attachment?
public String getText(Part p) throws MessagingException, IOException {
if (p.isMimeType("text/*")) {
boolean textIsHtml = false;
String s = (String) p.getContent();
textIsHtml = p.isMimeType("text/html");
return String.valueOf(s);
}
if (p.isMimeType("multipart/alternative")) {
// prefer html text over plain text
Multipart mp = (Multipart) p.getContent();
String text = null;
for (int i = 0; i < mp.getCount(); i++) {
Part bp = mp.getBodyPart(i);
if (bp.isMimeType("text/plain")) {
if (text == null)
text = getText(bp);
continue;
} else if (bp.isMimeType("text/html")) {
String s = getText(bp);
if (s != null)
return String.valueOf(s);
} else {
return getText(bp);
}
}
return text;
} else if (p.isMimeType("multipart/*")) {
Multipart mp = (Multipart) p.getContent();
for (int i = 0; i < mp.getCount(); i++) {
String s = getText(mp.getBodyPart(i));
// fileName = bp.getFileName();
if (s != null)
return String.valueOf(s);
}
}
return null;
}
Here is the code I use to parse attachments. I used to parse with multipart/attachment or multipart/*, and changed to this:
if( mimeMessage.getContent() instanceof Multipart) {
Multipart multipartContent = (Multipart) mimeMessage.getContent();
List<BodyPart> deleteThese = new ArrayList<BodyPart>();
for( int i = 0; i < multipartContent.getCount(); i++ ) {
MimeBodyPart part = (MimeBodyPart) multipartContent.getBodyPart(i);
String disposition = part.getDisposition();
if( disposition != null
&& ( disposition.equalsIgnoreCase( Part.ATTACHMENT )
|| ( disposition.equalsIgnoreCase( Part.INLINE )
&& !part.isMimeType( PLAIN_TEXT_MIME_TYPE )
&& !part.isMimeType( HTML_MIME_TYPE ) )
) ) {
// do something with part
}
}
Essentially if an email has a Multipart there is potential for an attachment, but you have to look at the content disposition to really know. Part.ATTACHMENT would be what you are interested in, and optionally you can ignore or parse the Part.INLINE.
I need to generate 1D barcode image and set it to ImageView according to given 13-character code. Can anyone help me with this please?
You can use zxing library to generate barcode easily.
first, locate core.jar under libs folder.
libs/core.jar
You can download ZXing-2.1.zip from here.
http://repo1.maven.org/maven2/com/google/zxing/ (source)
After unzipping the file, find the jar file.
\ZXing-2.1\zxing-2.1\core\core.jar
And then write your own code like below.
import java.util.EnumMap;
import java.util.Map;
import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.Gravity;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.TextView;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
public class BarcodeExampleActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LinearLayout l = new LinearLayout(this);
l.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
l.setOrientation(LinearLayout.VERTICAL);
setContentView(l);
// barcode data
String barcode_data = "123456";
// barcode image
Bitmap bitmap = null;
ImageView iv = new ImageView(this);
try {
bitmap = encodeAsBitmap(barcode_data, BarcodeFormat.CODE_128, 600, 300);
iv.setImageBitmap(bitmap);
} catch (WriterException e) {
e.printStackTrace();
}
l.addView(iv);
//barcode text
TextView tv = new TextView(this);
tv.setGravity(Gravity.CENTER_HORIZONTAL);
tv.setText(barcode_data);
l.addView(tv);
}
/**************************************************************
* getting from com.google.zxing.client.android.encode.QRCodeEncoder
*
* See the sites below
* http://code.google.com/p/zxing/
* http://code.google.com/p/zxing/source/browse/trunk/android/src/com/google/zxing/client/android/encode/EncodeActivity.java
* http://code.google.com/p/zxing/source/browse/trunk/android/src/com/google/zxing/client/android/encode/QRCodeEncoder.java
*/
private static final int WHITE = 0xFFFFFFFF;
private static final int BLACK = 0xFF000000;
Bitmap encodeAsBitmap(String contents, BarcodeFormat format, int img_width, int img_height) throws WriterException {
String contentsToEncode = contents;
if (contentsToEncode == null) {
return null;
}
Map<EncodeHintType, Object> hints = null;
String encoding = guessAppropriateEncoding(contentsToEncode);
if (encoding != null) {
hints = new EnumMap<EncodeHintType, Object>(EncodeHintType.class);
hints.put(EncodeHintType.CHARACTER_SET, encoding);
}
MultiFormatWriter writer = new MultiFormatWriter();
BitMatrix result;
try {
result = writer.encode(contentsToEncode, format, img_width, img_height, hints);
} catch (IllegalArgumentException iae) {
// Unsupported format
return null;
}
int width = result.getWidth();
int height = result.getHeight();
int[] pixels = new int[width * height];
for (int y = 0; y < height; y++) {
int offset = y * width;
for (int x = 0; x < width; x++) {
pixels[offset + x] = result.get(x, y) ? BLACK : WHITE;
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height,
Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}
private static String guessAppropriateEncoding(CharSequence contents) {
// Very crude at the moment
for (int i = 0; i < contents.length(); i++) {
if (contents.charAt(i) > 0xFF) {
return "UTF-8";
}
}
return null;
}
}
Thanks for your answers guys... In the meantime I found solution so here is what I used: http://www.onbarcode.com/products/android_barcode/barcodes/ean13.html
It's a library that worked fine for me so if anyone has the same issue I suggest using it.
Thanks again!
public Bitmap Ean13_Encode(String qrData, int qrCodeDimention) {
Bitmap bitmap= Bitmap.createBitmap(1, 1, Bitmap.Config.ARGB_8888);
QRCodeEncoder qrCodeEncoder = new QRCodeEncoder(qrData, null,
Contents.Type.TEXT, BarcodeFormat.EAN_13.toString(), qrCodeDimention);
try {
bitmap = qrCodeEncoder.encodeAsBitmap();
} catch (WriterException e) {
e.printStackTrace();
};
return bitmap;
};
public final class QRCodeEncoder {
private static final int WHITE = 0xFFFFFFFF;
private static final int BLACK = 0xFF000000;
private int dimension = Integer.MIN_VALUE;
private String contents = null;
private String displayContents = null;
private String title = null;
private BarcodeFormat format = null;
private boolean encoded = false;
public QRCodeEncoder(String data, Bundle bundle, String type, String format, int dimension) {
this.dimension = dimension;
encoded = encodeContents(data, bundle, type, format);
}
public String getContents() {
return contents;
}
public String getDisplayContents() {
return displayContents;
}
public String getTitle() {
return title;
}
private boolean encodeContents(String data, Bundle bundle, String type, String formatString) {
// Default to QR_CODE if no format given.
format = null;
if (formatString != null) {
try {
format = BarcodeFormat.valueOf(formatString);
} catch (IllegalArgumentException iae) {
// Ignore it then
}
}
if (format == null || format == BarcodeFormat.QR_CODE) {
this.format = BarcodeFormat.QR_CODE;
encodeQRCodeContents(data, bundle, type);
} else if (data != null && data.length() > 0) {
contents = data;
displayContents = data;
title = "Text";
}
return contents != null && contents.length() > 0;
}
private void encodeQRCodeContents(String data, Bundle bundle, String type) {
if (type.equals(Contents.Type.TEXT)) {
if (data != null && data.length() > 0) {
contents = data;
displayContents = data;
title = "Text";
}
} else if (type.equals(Contents.Type.EMAIL)) {
data = trim(data);
if (data != null) {
contents = "mailto:" + data;
displayContents = data;
title = "E-Mail";
}
} else if (type.equals(Contents.Type.PHONE)) {
data = trim(data);
if (data != null) {
contents = "tel:" + data;
displayContents = PhoneNumberUtils.formatNumber(data);
title = "Phone";
}
} else if (type.equals(Contents.Type.SMS)) {
data = trim(data);
if (data != null) {
contents = "sms:" + data;
displayContents = PhoneNumberUtils.formatNumber(data);
title = "SMS";
}
} else if (type.equals(Contents.Type.CONTACT)) {
if (bundle != null) {
StringBuilder newContents = new StringBuilder(100);
StringBuilder newDisplayContents = new StringBuilder(100);
newContents.append("MECARD:");
String name = trim(bundle.getString(ContactsContract.Intents.Insert.NAME));
if (name != null) {
newContents.append("N:").append(escapeMECARD(name)).append(';');
newDisplayContents.append(name);
}
String address = trim(bundle.getString(ContactsContract.Intents.Insert.POSTAL));
if (address != null) {
newContents.append("ADR:").append(escapeMECARD(address)).append(';');
newDisplayContents.append('\n').append(address);
}
Collection<String> uniquePhones = new HashSet<String>(Contents.PHONE_KEYS.length);
for (int x = 0; x < Contents.PHONE_KEYS.length; x++) {
String phone = trim(bundle.getString(Contents.PHONE_KEYS[x]));
if (phone != null) {
uniquePhones.add(phone);
}
}
for (String phone : uniquePhones) {
newContents.append("TEL:").append(escapeMECARD(phone)).append(';');
newDisplayContents.append('\n').append(PhoneNumberUtils.formatNumber(phone));
}
Collection<String> uniqueEmails = new HashSet<String>(Contents.EMAIL_KEYS.length);
for (int x = 0; x < Contents.EMAIL_KEYS.length; x++) {
String email = trim(bundle.getString(Contents.EMAIL_KEYS[x]));
if (email != null) {
uniqueEmails.add(email);
}
}
for (String email : uniqueEmails) {
newContents.append("EMAIL:").append(escapeMECARD(email)).append(';');
newDisplayContents.append('\n').append(email);
}
String url = trim(bundle.getString(Contents.URL_KEY));
if (url != null) {
// escapeMECARD(url) -> wrong escape e.g. http\://zxing.google.com
newContents.append("URL:").append(url).append(';');
newDisplayContents.append('\n').append(url);
}
String note = trim(bundle.getString(Contents.NOTE_KEY));
if (note != null) {
newContents.append("NOTE:").append(escapeMECARD(note)).append(';');
newDisplayContents.append('\n').append(note);
}
// Make sure we've encoded at least one field.
if (newDisplayContents.length() > 0) {
newContents.append(';');
contents = newContents.toString();
displayContents = newDisplayContents.toString();
title = "Contact";
} else {
contents = null;
displayContents = null;
}
}
} else if (type.equals(Contents.Type.LOCATION)) {
if (bundle != null) {
// These must use Bundle.getFloat(), not getDouble(), it's part of the API.
float latitude = bundle.getFloat("LAT", Float.MAX_VALUE);
float longitude = bundle.getFloat("LONG", Float.MAX_VALUE);
if (latitude != Float.MAX_VALUE && longitude != Float.MAX_VALUE) {
contents = "geo:" + latitude + ',' + longitude;
displayContents = latitude + "," + longitude;
title = "Location";
}
}
}
}
public Bitmap encodeAsBitmap() throws WriterException {
if (!encoded) return null;
Map<EncodeHintType, Object> hints = null;
String encoding = guessAppropriateEncoding(contents);
if (encoding != null) {
hints = new EnumMap<EncodeHintType, Object>(EncodeHintType.class);
hints.put(EncodeHintType.CHARACTER_SET, encoding);
}
MultiFormatWriter writer = new MultiFormatWriter();
BitMatrix result = writer.encode(contents, format, dimension, dimension, hints);
int width = result.getWidth();
int height = result.getHeight();
int[] pixels = new int[width * height];
// All are 0, or black, by default
for (int y = 0; y < height; y++) {
int offset = y * width;
for (int x = 0; x < width; x++) {
pixels[offset + x] = result.get(x, y) ? BLACK : WHITE;
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}
private String guessAppropriateEncoding(CharSequence contents) {
// Very crude at the moment
for (int i = 0; i < contents.length(); i++) {
if (contents.charAt(i) > 0xFF) { return "UTF-8"; }
}
return null;
}
private String trim(String s) {
if (s == null) { return null; }
String result = s.trim();
return result.length() == 0 ? null : result;
}
private String escapeMECARD(String input) {
if (input == null || (input.indexOf(':') < 0 && input.indexOf(';') < 0)) { return input; }
int length = input.length();
StringBuilder result = new StringBuilder(length);
for (int i = 0; i < length; i++) {
char c = input.charAt(i);
if (c == ':' || c == ';') {
result.append('\\');
}
result.append(c);
}
return result.toString();
}
}
Check out the answer on: Generate 1D barcode in Android
They suggest using IText which is a java PDF manipulation library. That also has the capability to generate barcode images.
You can find sample code in that question that I linked and also here