Utils.java

/*
 * Copyright 2012 Bitcoin Austria
 *
 * 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 at.bitcoin_austria.bitfluids;

import android.graphics.Bitmap;
import android.graphics.Color;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Hashtable;

public class Utils {
    private static final QRCodeWriter QR_CODE_WRITER = new QRCodeWriter();
    public static final String MTGOX_BTCEUR = "https://mtgox.com/api/1/BTCEUR/public/ticker";
    //todo SDF is not threadsafe, either use joda-time or create a new one each time
    public static final SimpleDateFormat timeFmt = new SimpleDateFormat("HH:mm:ss");
    public static final DecimalFormat eurDF = new DecimalFormat("0.00 €");
    public static final int TEN_MINUTES_IN_MILLIS = 10 * 60 * 1000;

    public static Bitmap getQRCodeBitmap(final String url, final int size) {
        try {
            final Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
            final BitMatrix result = QR_CODE_WRITER.encode(url, BarcodeFormat.QR_CODE, size, size, hints);

            final int width = result.getWidth();
            final int height = result.getHeight();
            final int[] pixels = new int[width * height];

            for (int y = 0; y < height; y++) {
                final int offset = y * width;
                for (int x = 0; x < width; x++) {
                    pixels[offset + x] = result.get(x, y) ? Color.BLACK : Color.WHITE;
                }
            }

            final Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
            bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
            return bitmap;
        } catch (final WriterException x) {
            x.printStackTrace();
            return null;
        }
    }

}