Android 生成二維碼工具類
阿新 • • 發佈：2019-05-24
/**
* 生成條形碼和二維碼的工具
*/
public class ZXingUtils {
/**
* 生成二維碼 要轉換的地址或字串,可以是中文
*
* @param url
* @param width
* @param height
* @return
*/
public static Bitmap createQRImage(String url, final int width, final int height) {
try {
// 判斷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");
//容錯率
//L 7,M 15,Q 25,H 30.
hints.put(EncodeHintType.ERROR_CORRECTION, "H");
//邊距 0最小 1 2最大
hints.put(EncodeHintType.MARGIN, "1");
// 影象資料轉換，使用了矩陣轉換
BitMatrix bitMatrix = new QRCodeWriter().encode(url,
BarcodeFormat.QR_CODE, width, height, hints);
int[] pixels = new int[width * height];
// 下面這裡按照二維碼的演算法，逐個生成二維碼的圖片，
// 兩個for迴圈是圖片橫列掃描的結果
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;
}
}
}
// 生成二維碼圖片的格式，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 (WriterException e) {
e.printStackTrace();
}
return null;
}
/**
* 用於向建立的二維碼中新增一個logo
* @param bm_QR
* @param bm_logo
* @return
*/
public static Bitmap addLogo(Bitmap bm_QR, Bitmap bm_logo) {
if (bm_QR == null) {
return null;
}
if (bm_logo == null) {
return bm_QR ;
}
//獲取圖片的寬高
int bm_QR_Width = bm_QR.getWidth() ;
int bm_QR_Height = bm_QR.getHeight();
int bm_logo_Width = bm_logo.getWidth() ;
int bm_logo_Height = bm_logo.getHeight();
//設定log0的大小為二維碼整體大小的1/4
float scale_logo = bm_QR_Width*1.0f /4/bm_logo_Width ;
Bitmap bitmap = Bitmap.createBitmap(bm_QR_Width, bm_QR_Height, Bitmap.Config.ARGB_8888);
try {
Canvas canvas = new Canvas(bitmap);
canvas.drawBitmap(bm_QR, 0, 0, null);
canvas.scale(scale_logo, scale_logo, bm_QR_Width / 2, bm_QR_Height / 2);
canvas.drawBitmap(bm_logo, (bm_QR_Width - bm_logo_Width) / 2, (bm_QR_Height - bm_logo_Height) / 2, null);
canvas.save();
canvas.restore();
} catch (Exception e) {
bitmap = null;
e.getStackTrace();
}
return bitmap;
}
/**
* 生成條形碼
*
* @param context
* @param contents
* 需要生成的內容
* @param desiredWidth
* 生成條形碼的寬頻
* @param desiredHeight
* 生成條形碼的高度
* @param displayCode
* 是否在條形碼下方顯示內容
* @return
*/
public static Bitmap creatBarcode(Context context, String contents,
int desiredWidth, int desiredHeight, boolean displayCode) {
Bitmap ruseltBitmap = null;
/**
* 圖片兩端所保留的空白的寬度
*/
int marginW = 20;
/**
* 條形碼的編碼型別
*/
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;
}
/**
* 生成條形碼的Bitmap
*
* @param contents
* 需要生成的內容
* @param format
* 編碼格式
* @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) {
// 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;
}
/**
* 生成顯示編碼的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);
ActionBar.LayoutParams layoutParams = new ActionBar.LayoutParams(
ActionBar.LayoutParams.MATCH_PARENT, ActionBar.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;
}
/**
* 將兩個Bitmap合併成一個
*
* @param first
* @param second
* @param fromPoint
* 第二個Bitmap開始繪製的起始位置（相對於第一個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();
cv.restore();
return newBitmap;
}
}