Zxing生成二維碼(可帶圖標)
SwetakeQRCode、BarCode4j、Zxing…… 生成二維碼的開源項很多,在下不才只目前只瞭解這幾個,
選擇Zxing的原因可能是因爲google吧,還一個就是Zxing網絡上解決方案比較多
首先要在build.gradle中添加 compile ‘com.google.zxing:core:3.2.1’
Zxing官網地址點我
private void Create2QR2(String urls,ImageView imageView) {
String uri = urls;
int mScreenWidth = 0;
Bitmap bitmap;
try {
/**
* 獲取屏幕信息的區別
* 只有activity可以使用WindowManager否則應該使用Context.getResources().getDisplayMetrics()來獲取。
* Context.getResources().getDisplayMetrics()依賴於手機系統,獲取到的是系統的屏幕信息;
* WindowManager.getDefaultDisplay().getMetrics(dm)是獲取到Activity的實際屏幕信息。
*/
DisplayMetrics dm = new DisplayMetrics();
aty.getWindowManager().getDefaultDisplay().getMetrics(dm);
mScreenWidth = dm.widthPixels;
bitmap = BitmapUtil.createQRImage(uri, mScreenWidth,
BitmapFactory.decodeResource(getResources(), R.mipmap.applogo));//自己寫的方法
if (bitmap != null) {
imageView.setImageBitmap(bitmap);
}
} catch (Exception e) {
e.printStackTrace();
}
}
//生成二維碼圖片(不帶圖片)
public static Bitmap createQRCode(String url, int widthAndHeight)
throws WriterException {
Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
BitMatrix matrix = new MultiFormatWriter().encode(str,
BarcodeFormat.QR_CODE, widthAndHeight, widthAndHeight);
int width = matrix.getWidth();
int height = matrix.getHeight();
int[] pixels = new int[width * height];
//畫黑點
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
if (matrix.get(x, y)) {
pixels[y * width + x] = BLACK; //0xff000000
}
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height,
Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}
帶圖片的二維碼
public static Bitmap createQRImage(String content, int heightPix, Bitmap logoBm) {
try {
// if (content == null || "".equals(content)) {
// return false;
// }
//配置參數
Map<EncodeHintType, Object> hints = new HashMap<>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
//容錯級別
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
//設置空白邊距的寬度
// hints.put(EncodeHintType.MARGIN, 2); //default is 4
// 圖像數據轉換,使用了矩陣轉換
BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, heightPix, heightPix, hints);
int[] pixels = new int[heightPix * heightPix];
// 下面這裏按照二維碼的算法,逐個生成二維碼的圖片,
// 兩個for循環是圖片橫列掃描的結果
for (int y = 0; y < heightPix; y++) {
for (int x = 0; x < heightPix; x++) {
if (bitMatrix.get(x, y)) {
pixels[y * heightPix + x] = 0xff000000;
} else {
pixels[y * heightPix + x] = 0xffffffff;
}
}
}
// 生成二維碼圖片的格式,使用ARGB_8888
Bitmap bitmap = Bitmap.createBitmap(heightPix, heightPix, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, heightPix, 0, 0, heightPix, heightPix);
if (logoBm != null) {
bitmap = addLogo(bitmap, logoBm);
}
//必須使用compress方法將bitmap保存到文件中再進行讀取。直接返回的bitmap是沒有任何壓縮的,內存消耗巨大!
return bitmap;
} catch (WriterException e) {
e.printStackTrace();
}
return null;
}
/**
* 在二維碼中間添加Logo圖案
*/
private static Bitmap addLogo(Bitmap src, Bitmap logo) {
if (src == null) {
return null;
}
if (logo == null) {
return src;
}
//獲取圖片的寬高
int srcWidth = src.getWidth();
int srcHeight = src.getHeight();
int logoWidth = logo.getWidth();
int logoHeight = logo.getHeight();
if (srcWidth == 0 || srcHeight == 0) {
return null;
}
if (logoWidth == 0 || logoHeight == 0) {
return src;
}
//logo大小爲二維碼整體大小的1/5
float scaleFactor = srcWidth * 1.0f / 5 / logoWidth;
Bitmap bitmap = Bitmap.createBitmap(srcWidth, srcHeight, Bitmap.Config.ARGB_8888);
try {
Canvas canvas = new Canvas(bitmap);
canvas.drawBitmap(src, 0, 0, null);
canvas.scale(scaleFactor, scaleFactor, srcWidth / 2, srcHeight / 2);
canvas.drawBitmap(logo, (srcWidth - logoWidth) / 2, (srcHeight - logoHeight) / 2, null);
canvas.save(Canvas.ALL_SAVE_FLAG);
canvas.restore();
} catch (Exception e) {
bitmap = null;
e.getStackTrace();
}
return bitmap;
}