如何在不压缩图像的情况下将图像转换为Base64字符串? [英] How to convert a image into Base64 string without compressing the image?
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问题描述
每次更新同一张图片时,图像压缩方法都会降低图像质量.
Every time I update the same picture the image quality has been decreased by image compression method.
public String BitMapToString(Bitmap bitmap) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);
byte[] b = baos.toByteArray();
base64Image = Base64.encodeToString(b, Base64.DEFAULT);
return base64Image;
}
我不想一次又一次地压缩图像.请提出一些建议.
I don't want to compress image again and again. Please suggest something.
推荐答案
首先使用PNG压缩不会丢失图像质量.
First of all using PNG compression will not lose image quality.
如果无论如何都希望获得不压缩的字节,则可以尝试以下操作:
If you want to get the bytes without compression anyway, you can try the following:
ByteBuffer buffer = ByteBuffer.allocate(bitmap.getRowBytes() * bitmap.getHeight());
bitmap.copyPixelsToBuffer(buffer);
byte[] data = buffer.array();
要从字节数组中获取位图
:
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.copyPixelsFromBuffer(ByteBuffer.wrap(data));
return bitmap;
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