风流不在谈锋胜，袖手无言味最长。这篇文章主要讲述Android二维码生成相关的知识，希望能为你提供帮助。
最新在学习adnroid，遇到二维码的生成与扫描在此做个整理
贴下二维码生成的工具类
/**
* 二维码生成工具类
*/
public class QRCodeUtil {
/**
* 生成二维码 要转换的地址或字符串,可以是中文
* @param url
* @param width
* @param height
* @return
*/
【Android二维码生成】
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 = new QRCodeWriter().encode(url,
BarcodeFormat.QR_CODE, width, height, hints);
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,Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
} catch (WriterException 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;
}
/**
* 生成条形码的Bitmap
*
* @param contents
*
需要生成的内容
* @param format
*
编码格式
* @param desiredWidth
* @param desiredHeight
* @return
* @throws WriterException
*/
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) {
e.printStackTrace();
}
int width = result.getWidth();
int height = result.getHeight();
int[] pixels = new int[width * height];
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,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);
LayoutParams layoutParams = new LayoutParams(LayoutParams.MATCH_PARENT, 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(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
MeasureSpec.makeMeasureSpec(0, 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(), 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;
}
}
在activity中直接使用即可
//第一个参数要生成二维码的字符串
Bitmap qrBitmap = QRCodeUtil.createQRImage("Revolve",400, 400);
//iv表示在xml中imageview的id
iv.setImageBitmap(qrBitmap);
推荐阅读
- Android 解决RecyclerView瀑布流效果结合Glide使用时图片变形的问题
- 获取spring的ApplicationContext几种方式
- Android 滚动RecyclerView加载图片时的流畅度优化
- APP出现内存泄漏的几种情况
- Android RecyclerView利用Glide加载大量图片into(Target)导致OOM异常
- PWA(Progressive Web App)入门系列（相关准备）
- U盘分区工具免费下载
- 最容易的U盘量产工具安装办法
- U盘安装64位系统免费下载