由于项目需求，需要用户端生成二维码，并合成到另一张图中展示，以helloBike的一张图为例,图二用自己的二维码替换了图一中二维码。
1.jpg
2.jpg
1、二维码生成
二维码生成用到了Zxing 包,gradle 中引用
compile 'com.google.zxing:core:3.2.1'
生成带有logo的二维码
public class QrCodeUtil{
/**
* 黑点颜色
*/
private static final int BLACK = 0xFF000000;
/**
* 白色
*/
private static final int WHITE = 0xFFFFFFFF;
/**
* 正方形二维码宽度
*/
private static final int CODE_WIDTH = 180;
/**
* LOGO宽度值,最大不能大于二维码20%宽度值,大于可能会导致二维码信息失效
*/
private static final int LOGO_WIDTH_MAX = CODE_WIDTH / 4;
/**
*LOGO宽度值,最小不能小于二维码10%宽度值,小于影响Logo与二维码的整体搭配
*/
private static final int LOGO_WIDTH_MIN = CODE_WIDTH / 10;
/**
* 生成的二维码图片存储的URI
*/
private Uri imageFileUri;
/**
* 生成带LOGO的二维码
*/
public Bitmap createCode(String content, Bitmap logoBitmap)
throws WriterException {
int logoWidth = logoBitmap.getWidth();
int logoHeight = logoBitmap.getHeight();
int logoHaleWidth = logoWidth >= CODE_WIDTH ? LOGO_WIDTH_MIN
: LOGO_WIDTH_MAX;
int logoHaleHeight = logoHeight >= CODE_WIDTH ? LOGO_WIDTH_MIN
: LOGO_WIDTH_MAX;
// 将logo图片按martix设置的信息缩放
Matrix m = new Matrix();
float sx = (float) logoHaleWidth / logoWidth;
float sy = (float) logoHaleHeight / logoHeight;
m.setScale(sx, sy);// 设置缩放信息
Bitmap newLogoBitmap = Bitmap.createBitmap(logoBitmap, 0, 0, logoWidth,
logoHeight, m, false);
int newLogoWidth = newLogoBitmap.getWidth();
int newLogoHeight = newLogoBitmap.getHeight();
Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);//设置容错级别,H为最高
hints.put(EncodeHintType.MAX_SIZE, LOGO_WIDTH_MAX);// 设置图片的最大值
hints.put(EncodeHintType.MIN_SIZE, LOGO_WIDTH_MIN);// 设置图片的最小值
hints.put(EncodeHintType.MARGIN, 2);//设置白色边距值
// 生成二维矩阵,编码时指定大小,不要生成了图片以后再进行缩放,这样会模糊导致识别失败
BitMatrix matrix = new MultiFormatWriter().encode(content,
BarcodeFormat.QR_CODE, CODE_WIDTH, CODE_WIDTH, hints);
int width = matrix.getWidth();
int height = matrix.getHeight();
int halfW = width / 2;
int halfH = height / 2;
// 二维矩阵转为一维像素数组,也就是一直横着排了
int[] pixels = new int[width * height];
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
/*
* 取值范围,可以画图理解下
* halfW + newLogoWidth / 2 - (halfW - newLogoWidth / 2) = newLogoWidth
* halfH + newLogoHeight / 2 - (halfH - newLogoHeight) = newLogoHeight
*/
if (x > halfW - newLogoWidth / 2&& x < halfW + newLogoWidth / 2
&& y > halfH - newLogoHeight / 2 && y < halfH + newLogoHeight / 2) {// 该位置用于存放图片信息
/*
* 记录图片每个像素信息
* halfW - newLogoWidth / 2 < x < halfW + newLogoWidth / 2
* --> 0 < x - halfW + newLogoWidth / 2 < newLogoWidth
* halfH - newLogoHeight / 2 < y < halfH + newLogoHeight / 2
* -->0 < y - halfH + newLogoHeight / 2 < newLogoHeight
* 刚好取值newLogoBitmap。getPixel(0-newLogoWidth,0-newLogoHeight);
*/
pixels[y * width + x] = newLogoBitmap.getPixel(
x - halfW + newLogoWidth / 2, y - halfH + newLogoHeight / 2);
} else {
pixels[y * width + x] = matrix.get(x, y) ? BLACK: WHITE;// 设置信息
}
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height,
Bitmap.Config.ARGB_8888);
// 通过像素数组生成bitmap,具体参考api
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}
}
2、图片合成，利用canvas合成图片
public class ImageUtil{
public static Bitmap compoundBitmap(Bitmap BitmapOne,Bitmap BitmapTwo){
Bitmap newBitmap = null;
newBitmap = Bitmap.createBitmap(BitmapOne);
Canvas canvas = new Canvas(newBitmap);
Paint paint = new Paint();
int w = BitmapOne.getWidth();
int h = BitmapOne.getHeight();
int w_2 = BitmapTwo.getWidth();
int h_2 = BitmapTwo.getHeight();BitmapOne.getHeight(), paint);
paint = new Paint();
//设置第二张图片的 左、上的位置坐标
canvas.drawBitmap(BitmapTwo, 16,
h-16-h_2, paint);
canvas.save(Canvas.ALL_SAVE_FLAG);
// 存储新合成的图片
canvas.restore();
return newBitmap;
}
}
3、调用,这里第一张图我是从网络取的，所以需要下载图片
//生成二维码
final QrCodeUtil qrCodeUtil = new QrCodeUtil();
try {
bitmapQrCode = qrCodeUtil.createCode("https://www.baidu.com/", BitmapFactory.decodeResource(getResources(), R.drawable.finish_icon_highligh));
} catch (WriterException e) {
e.printStackTrace();
}
//下载网络背景图
Glide.with(CtxHelper.getApp())
.load("https://img.haomeiwen.com/i2048265/44f59db66cecd375.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240")
.asBitmap().into(new SimpleTarget<Bitmap>() {
@Override
public void onLoadFailed(Exception e, Drawable errorDrawable) {
super.onLoadFailed(e, errorDrawable);
//下载失败
}
@Override
public void onResourceReady(Bitmap resource, GlideAnimation<? super Bitmap> glideAnimation) {
//下载成功
if (bitmapQrCode != null) {
//合成图片
Bitmap bitmap = ImageUtils.compoundImage(resource, bitmapQrCode);
if (bitmap != null) {
//将重新生成的图片显示到界面上
mIvBanner.setImageBitmap(bitmap);
}
}
}
});
总结：到这功能就实现了，补充一下图片合成的几种方法：
1、上面例子中的利用canvas画出来
public void compoundImage(View v) {
// 防止出现Immutable bitmap passed to Canvas constructor错误
Bitmap bitmap1 = BitmapFactory.decodeResource(getResources(),
R.drawable.apple).copy(Bitmap.Config.ARGB_8888, true);
Bitmap bitmap2 = ((BitmapDrawable) getResources().getDrawable(
R.drawable.go)).getBitmap();
Bitmap newBitmap = null;
newBitmap = Bitmap.createBitmap(bitmap1);
Canvas canvas = new Canvas(newBitmap);
Paint paint = new Paint();
int w = bitmap1.getWidth();
int h = bitmap1.getHeight();
int w_2 = bitmap2.getWidth();
int h_2 = bitmap2.getHeight();
paint = new Paint();
// 设置第二张图片的位置
canvas.drawBitmap(bitmap2, Math.abs(w - w_2) / 2,
Math.abs(h - h_2) / 2, paint);
canvas.save(Canvas.ALL_SAVE_FLAG);
// 存储新合成的图片
canvas.restore();
image.setImageBitmap(newBitmap);
}
2、使用系统的LayerDrawable类
public void compoundImage(View v) {
Bitmap bitmap1 = ((BitmapDrawable) getResources().getDrawable(
R.drawable.apple)).getBitmap();
Bitmap bitmap2 = ((BitmapDrawable) getResources().getDrawable(
R.drawable.go)).getBitmap();
Drawable[] array = new Drawable[2];
array[0] = new BitmapDrawable(bitmap1);
array[1] = new BitmapDrawable(bitmap2);
LayerDrawable la = new LayerDrawable(array);
// 其中第一个参数为层的索引号，后面的四个参数分别为left、top、right和bottom
la.setLayerInset(0, 0, 0, 0, 0);
la.setLayerInset(1, 20, 20, 20, 20);
image.setImageDrawable(la);
}
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