安卓生成二维码demo

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举个栗子。

  1. 需要用到zxing这个库。
    下载core-3.4.0.jar这个东西，修改Android.mk,将core-3.4.0.jar写到LOCAL_STATIC_JAVA_LIBRARIES和LOCAL_PREBUILT_STATIC_JAVA_LIBRARIES，用于编译。

  2. 添加二维码工具类QRCodeUtils.java 

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    package com.test.menu.util;

    import android.graphics.Bitmap;
    import android.graphics.Canvas;
    import android.graphics.Matrix;
    import android.support.annotation.Nullable;
    import android.text.TextUtils;

    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 java.util.Hashtable;

    public class QRCodeUtils {
    	
        private static final String TAG = "QRCodeUtil";
    	
    	public static Bitmap createQRImage(String url, final int width, final int height) {
            try {
    			
                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");
                hints.put(EncodeHintType.MARGIN, "1");

                BitMatrix bitMatrix = new QRCodeWriter().encode(url,
                        BarcodeFormat.QR_CODE, width, height, hints);
                int[] pixels = new int[width * height];


                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;
                        }
                    }
                }

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

  3. 制作菜单
    略

  4. 把二维码图片设置到菜单
    二维码图片的内容是往createQRImage传入的字符串。 

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    String allString = "helloworld";
    mImageView.setImageBitmap(QRCodeUtils.createQRImage(allString, 128, 128));