二维码输入数字扫描

package com.example.erweima;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.PointF;
import android.view.Gravity;
import android.view.View;
import android.widget.LinearLayout;
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;
import com.google.zxing.qrcode.QRCodeWriter;

import java.util.Hashtable;

/**
 * Created by Administrator on 2017\10\2 0002.
 */

public class ZXingUtils {
    public static Bitmap createQRImage(String url, final int width, final int height) {
        try {
            // 判断URL合法性
            if (url == null || "".equals(url) || url.length() < 1) {
                return null;
            }
            Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
            // 图像数据转换，使用了矩阵转换
            BitMatrix bitMatrix = null;
            try {
                bitMatrix = new QRCodeWriter().encode(url, BarcodeFormat.QR_CODE, width, height, hints);
            } catch (WriterException e) {
                e.printStackTrace();
            }
            int[] pixels = new int[width * height];
            // 下面这里按照二维码的算法，逐个生成二维码的图片，
            // 两个for循环是图片横列扫描的结果
            for (int y = 0; y < height; y++) {
                for (int x = 0; x < width; x++) {
                    if (bitMatrix.get(x, y)) {
                        pixels[y * width + x] = 0xff000000;
                    } else {
                        pixels[y * width + x] = 0xffffffff;
                    }
                }
            }
            // 生成二维码图片的格式，使用ARGB_8888
            Bitmap bitmap = Bitmap.createBitmap(width, height,
                    Bitmap.Config.ARGB_8888);
            bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
            return bitmap;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 生成条形码
     *     * @param context     * @param contents     *            需要生成的内容     * @param desiredWidth     *            生成条形码的宽带     * @param desiredHeight     *            生成条形码的高度     * @param displayCode     *            是否在条形码下方显示内容     * @return     */    public static Bitmap creatBarcode(Context context, String contents,                                      int desiredWidth, int desiredHeight, boolean displayCode) {        Bitmap ruseltBitmap = null;        /**         * 图片两端所保留的空白的宽度         */        int marginW = 20;        /**         * 条形码的编码类型         */        BarcodeFormat barcodeFormat = BarcodeFormat.CODE_128;        if (displayCode) {            Bitmap barcodeBitmap = encodeAsBitmap(contents, barcodeFormat,                    desiredWidth, desiredHeight);            Bitmap codeBitmap = creatCodeBitmap(contents, desiredWidth + 2                    * marginW, desiredHeight, context);            ruseltBitmap = mixtureBitmap(barcodeBitmap, codeBitmap, new PointF(                    0, desiredHeight));        } else {            ruseltBitmap = encodeAsBitmap(contents, barcodeFormat,                    desiredWidth, desiredHeight);        }        return ruseltBitmap;    }    protected static Bitmap encodeAsBitmap(String contents,                                           BarcodeFormat format, int desiredWidth, int desiredHeight) {        final int WHITE = 0xFFFFFFFF;        final int BLACK = 0xFF000000;        MultiFormatWriter writer = new MultiFormatWriter();        BitMatrix result = null;        try {            result = writer.encode(contents, format, desiredWidth,                    desiredHeight, null);        } catch (WriterException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        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;    }    /**     * 生成显示编码的Bitmap     *     * @param contents     * @param width     * @param height     * @param context     * @return     */    protected static Bitmap creatCodeBitmap(String contents, int width,                                            int height, Context context) {        TextView tv = new TextView(context);        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(                LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);        tv.setLayoutParams(layoutParams);        tv.setText(contents);        tv.setHeight(height);        tv.setGravity(Gravity.CENTER_HORIZONTAL);        tv.setWidth(width);        tv.setDrawingCacheEnabled(true);        tv.setTextColor(Color.BLACK);        tv.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));        tv.layout(0, 0, tv.getMeasuredWidth(), tv.getMeasuredHeight());        tv.buildDrawingCache();        Bitmap bitmapCode = tv.getDrawingCache();        return bitmapCode;    }    /**     * 将两个Bitmap合并成一个     *     * @param first     * @param second     * @param fromPoint     *            第二个Bitmap开始绘制的起始位置（相对于第一个Bitmap）     * @return     */    protected static Bitmap mixtureBitmap(Bitmap first, Bitmap second,                                          PointF fromPoint) {        if (first == null || second == null || fromPoint == null) {            return null;        }        int marginW = 20;        Bitmap newBitmap = Bitmap.createBitmap(                first.getWidth() + second.getWidth() + marginW,                first.getHeight() + second.getHeight(), Bitmap.Config.ARGB_4444);        Canvas cv = new Canvas(newBitmap);        cv.drawBitmap(first, marginW, 0, null);        cv.drawBitmap(second, fromPoint.x, fromPoint.y, null);        cv.save(Canvas.ALL_SAVE_FLAG);        cv.restore();        return newBitmap;    }}