Hello group.
This wrapper will allow easy offline creation of QR codes and EAN-13 & EAN-8 barcodes, using the opensource zxing library.
Sample project :
full wrapper source code, as it's based in a open source project, and someone needs to improve it :
Decompress the zip to your ExtraLibs folder.
In the zip there is core zxing lib, renamed to zxing-core.jar. This is git pull from 20-08-2013, that i had in my computer. I think that it would be save to get a more recent one, but my home crappy internet would take hours to do a git refresh.
Nelson
Find it usefull ? paypal me a beer. (valeria_pires_@hotmail.com)
This wrapper will allow easy offline creation of QR codes and EAN-13 & EAN-8 barcodes, using the opensource zxing library.
Sample project :
B4X:
#Region Project Attributes
#ApplicationLabel: B4A Example
#VersionCode: 1
#VersionName:
'SupportedOrientations possible values: unspecified, landscape or portrait.
#SupportedOrientations: unspecified
#CanInstallToExternalStorage: False
#End Region
#Region Activity Attributes
#FullScreen: False
#IncludeTitle: True
#End Region
Sub Process_Globals
'These global variables will be declared once when the application starts.
'These variables can be accessed from all modules.
End Sub
Sub Globals
'These global variables will be redeclared each time the activity is created.
'These variables can only be accessed from this module.
Dim b,b1,b2 As ImageView
Dim qr As QRCode
End Sub
Sub Activity_Create(FirstTime As Boolean)
'Do not forget to load the layout file created with the visual designer. For example:
'Activity.LoadLayout("Layout1")
b.Initialize("")
b1.Initialize("")
b1.Gravity=Gravity.FILL
b2.Initialize("")
b2.Gravity=Gravity.FILL
Activity.AddView(b,0,0,200dip,200dip)
Activity.AddView(b1,0,220dip,300dip,100dip)
Activity.AddView(b2,0,330dip,300dip,100dip)
qr.initialize
b.Bitmap = qr.QR_Encode("TESTING QR CODES",200dip)
b1.Bitmap = qr.Ean13_Encode(calc_ean_checksum("123456789012"),100dip)
b2.Bitmap = qr.Ean8_Encode(calc_ean_checksum("1234567"),100dip)
End Sub
Sub Activity_Resume
End Sub
Sub Activity_Pause (UserClosed As Boolean)
End Sub
Sub calc_ean_checksum(number As String) As String
Dim i As Int
Dim c As Char
Dim soma As Int
Dim n As Int
Dim digit As Float
soma = 0
For i=0 To number.Length - 1
digit = number.SubString2(i,i+1)
n= digit * ((i Mod 2) * 2 + 1)
soma=soma+n
Next
Return number & ( ( 10 - ( soma Mod 10 )) Mod 10 )
End Subfull wrapper source code, as it's based in a open source project, and someone needs to improve it :
B4X:
package com.inforpires.baQRCode;
import anywheresoftware.b4a.BA;
import anywheresoftware.b4a.BA.*;
import anywheresoftware.b4a.BA.ActivityObject;
import anywheresoftware.b4a.BA.DontInheritEvents;
import anywheresoftware.b4a.BA.Events;
import anywheresoftware.b4a.BA.Hide;
import anywheresoftware.b4a.BA.Permissions;
import anywheresoftware.b4a.BA.ShortName;
import anywheresoftware.b4a.BA.Version;
import anywheresoftware.b4a.BA.DependsOn;
import anywheresoftware.b4a.objects.ViewWrapper;
import anywheresoftware.b4a.AbsObjectWrapper;
import android.provider.ContactsContract;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.telephony.PhoneNumberUtils;
import java.util.Collection;
import java.util.EnumMap;
import java.util.HashSet;
import java.util.Map;
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;
import android.provider.ContactsContract;
@Version(1.0f)
@Author("Nelson Pires")
@ShortName("QRCode")
@DontInheritEvents
@DependsOn(values={"core-zxing"})
public class baQRCode {
public void initialize() {
// WHAT ???
};
public Bitmap QR_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.QR_CODE.toString(), qrCodeDimention);
try {
bitmap = qrCodeEncoder.encodeAsBitmap();
} catch (WriterException e) {
e.printStackTrace();
};
return bitmap;
};
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 Bitmap Ean8_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_8.toString(), qrCodeDimention);
try {
bitmap = qrCodeEncoder.encodeAsBitmap();
} catch (WriterException e) {
e.printStackTrace();
};
return bitmap;
};
private static class Contents {
private Contents() {
}
private class Type {
// Plain text. Use Intent.putExtra(DATA, string). This can be used for URLs too, but string
// must include "http://" or "https://".
public static final String TEXT = "TEXT_TYPE";
// An email type. Use Intent.putExtra(DATA, string) where string is the email address.
public static final String EMAIL = "EMAIL_TYPE";
// Use Intent.putExtra(DATA, string) where string is the phone number to call.
public static final String PHONE = "PHONE_TYPE";
// An SMS type. Use Intent.putExtra(DATA, string) where string is the number to SMS.
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";
// When using Type.CONTACT, these arrays provide the keys for adding or retrieving multiple phone numbers and addresses.
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
};
}
// -------------------------------------------- Fim
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();
}
}
}Decompress the zip to your ExtraLibs folder.
In the zip there is core zxing lib, renamed to zxing-core.jar. This is git pull from 20-08-2013, that i had in my computer. I think that it would be save to get a more recent one, but my home crappy internet would take hours to do a git refresh.
Nelson
Find it usefull ? paypal me a beer. (valeria_pires_@hotmail.com)
)
