Android Open Source - DistributedMemory Q R Code Encoder

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License

The source code is released under:
Apache License
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Java Source Code

/*
 * Copyright (C) 2008 ZXing authors/*w  w  w.j  av  a2 s. c o m*/
 *
 * 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.
 */
package org.faudroids.distributedmemory.utils;

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.client.android.Contents;
import com.google.zxing.common.BitMatrix;

import java.util.Collection;
import java.util.EnumMap;
import java.util.HashSet;
import java.util.Map;

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 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();
  }
}
Java Source Code List
