生成二维码，并添加logo

首先需要下载谷歌提供的二维码工具包Zxing-core-3.2.1.jar 网上有很多下载，可以自行下载。

也是根据网上的一篇文章，然后再进行了优化，由于忘记了是哪一篇文章，若是作者看到了，请留言，我加上出处。

下面我直接上代码

public class HomeUtils {
    /**
     * 生成二维码
     * @param content
     * @param width
     * @param height
     * @return
     */
    public static Bitmap getBitmap(String content, int width, int height) {
        QRCodeWriter qrCodeWriter = new QRCodeWriter();
        Map, String> hints = new HashMap<>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        try {
            BitMatrix encode = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, width, height, hints);
            int space = 0;
            out:for (int i = 0; i < height; i++) {
                for (int j = 0; j < width; j++) {
                    if (encode.get(j, i)) {
                        space = i;
                        break out;
                    }
                }
            }
            int newWidth = width - space * 2;
            int newHeight = height - space * 2;
            int[] pixels = new int[newWidth * newHeight];
            for (int i = space; i < height - space; i++) {
                for (int j = space; j < width - space; j++) {
                    if (encode.get(j, i)) {
                        pixels[(i - space) * newWidth + (j - space)] = 0x00000000;
                    } else {
                        pixels[(i - space) * newWidth + (j - space)] = 0xffffffff;
                    }
                }
            }
            return Bitmap.createBitmap(pixels, 0, newWidth, newWidth, newHeight, Bitmap.Config.RGB_565);
        } catch (WriterException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 在二维码中加入logo
     * @param qrBitmap
     * @param logoBitmap
     * @return
     */
    public static Bitmap addLogo(Bitmap qrBitmap, Bitmap logoBitmap) {
        int qrBitmapWidth = qrBitmap.getWidth();
        int qrBitmapHeight = qrBitmap.getHeight();
        int logoBitmapWidth = logoBitmap.getWidth();
        int logoBitmapHeight = logoBitmap.getHeight();
        Bitmap blankBitmap = Bitmap.createBitmap(qrBitmapWidth, qrBitmapHeight, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(blankBitmap);
        canvas.drawBitmap(qrBitmap, 0, 0, null);
        canvas.save(Canvas.ALL_SAVE_FLAG);
        float scaleSize = 1.0f;
        while ((logoBitmapWidth / scaleSize) > (qrBitmapWidth / 5) || (logoBitmapHeight / scaleSize) > (qrBitmapHeight / 5)) {
            scaleSize *= 2;
        }
        float sx = 1.0f / scaleSize;
        canvas.scale(sx, sx, qrBitmapWidth / 2, qrBitmapHeight / 2);
        canvas.drawBitmap(logoBitmap, (qrBitmapWidth - logoBitmapWidth) / 2, (qrBitmapHeight - logoBitmapHeight) / 2, null);
        canvas.restore();
        return blankBitmap;
    }

    /**
     * 生成二维码弹出框
     *
     * @param context
     * @param bitmap
     * @return
     */
    public static AlertDialog commonDialog(Context context, Bitmap bitmap) {
        AlertDialog dialog;
        dialog = new AlertDialog.Builder(context).create();
        dialog.show();
        dialog.getWindow().setLayout(Util.dp2px(295), Util.dp2px(395));
        dialog.getWindow().setContentView(R.layout.face_to_face_layout);
        dialog.getWindow().setBackgroundDrawableResource(R.color.transparent);
        ImageView iv_face_to_face = dialog.getWindow().findViewById(R.id.iv_face_to_face);
        iv_face_to_face.setImageBitmap(bitmap);
        dialog.getWindow().findViewById(R.id.iv_cancel_dialog).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dialog.dismiss();
            }
        });
        return dialog;
    }
}

这里是写了个工具类。

在acitivity中调用方法

Bitmap qrBitmap= HomeUtils.getBitmap(mAdapter.getItem(position).getUrl(), Util.dp2px(255),Util.dp2px(255));
Bitmap logoBitmap= BitmapFactory.decodeResource(getResources(),R.mipmap.ic_dialog_logo);
Bitmap bitmap=HomeUtils.addLogo(qrBitmap,logoBitmap);

HomeUtils.commonDialog(InvitePrizesActivity.this,bitmap);

其中getUrl是服务器返的url地址，这个可自行添加有个地址测试，比如www.baidu.com;

以上就是全部代码；