android位图不是从base64创建的(android bitmap isn't created from base64)
我有一个Android应用程序，它将图像发送到Web服务。 我想将相同的照片从Web服务发送回Android。
我做了一个测试程序来比较从Android发送到服务器的base64数据和从服务器发送回Android的base64 - 它们完全相同。
我想使用base 64字符串来创建位图，所以我尝试了这个：
String image = client1.getBaseURI("restaurantFoods/OneFood/" + this.getID() + "/getImage"); byte[] decodedString = Base64.decode(image, Base64.DEFAULT); Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length); if(decodedByte == null){ Log.d(this.getFoodItem().getName(), image); Log.d("isNull", "Yes"); } else{ Log.d("isNull", "No");}我一直都是null，因为日志只打印“YES”。
有人可以帮忙吗？
如果您想知道我如何编码图像，它如下：
private String getBase64(Bitmap bitmap) { String imgString = Base64.encodeToString(getBytesFromBitmap(bitmap), Base64.NO_WRAP); return imgString; } private byte[] getBytesFromBitmap(Bitmap bitmap) { ByteArrayOutputStream stream = new ByteArrayOutputStream(); bitmap.compress(CompressFormat.JPEG, 70, stream); return stream.toByteArray(); } Bitmap icon = BitmapFactory.decodeResource(this.getResources(), R.drawable.pizza); String iconBase64 = this.getBase64(icon);I have an Android application which sends an image to a web service. I want to send the same photo back from the web service to Android.
I made a test program to compare the base64 data that's sent from Android to the server and the base64 that's sent back from server to Android -- they are exactly equal.
I want to use the base 64 string to create a bitmap, so I tried this:
String image = client1.getBaseURI("restaurantFoods/OneFood/" + this.getID() + "/getImage"); byte[] decodedString = Base64.decode(image, Base64.DEFAULT); Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length); if(decodedByte == null){ Log.d(this.getFoodItem().getName(), image); Log.d("isNull", "Yes"); } else{ Log.d("isNull", "No");}I keep getting null because the log just prints "YES".
Can anyone please help?
If you want to know how I encode the image it is as follows:
private String getBase64(Bitmap bitmap) { String imgString = Base64.encodeToString(getBytesFromBitmap(bitmap), Base64.NO_WRAP); return imgString; } private byte[] getBytesFromBitmap(Bitmap bitmap) { ByteArrayOutputStream stream = new ByteArrayOutputStream(); bitmap.compress(CompressFormat.JPEG, 70, stream); return stream.toByteArray(); } Bitmap icon = BitmapFactory.decodeResource(this.getResources(), R.drawable.pizza); String iconBase64 = this.getBase64(icon);
原文：https://stackoverflow.com/questions/16966656
更新时间：2023-08-15 12:08
最满意答案
因为语言标准的第6.4.4.2节“浮动常量”因此定义它们：
floating-constant: decimal-floating-constant hexadecimal-floating-constant decimal-floating-constant: fractional-constant exponent-part(opt) floating-suffix(opt) digit-sequence exponent-part floating-suffix(opt) hexadecimal-floating-constant: hexadecimal-prefix hexadecimal-fractional-constant binary-exponent-part floating-suffixopt hexadecimal-prefix hexadecimal-digit-sequence binary-exponent-part floating-suffix(opt) fractional-constant: digit-sequence(opt) . digit-sequence digit-sequence . exponent-part: e sign(opt) digit-sequence E sign(opt) digit-sequence sign: one of + - digit-sequence: digit digit-sequence digit hexadecimal-fractional-constant: hexadecimal-digit-sequence(opt) . hexadecimal-digit-sequence hexadecimal-digit-sequence . binary-exponent-part: p sign(opt) digit-sequence P sign(opt) digit-sequence hexadecimal-digit-sequence: hexadecimal-digit hexadecimal-digit-sequence hexadecimal-digit floating-suffix: one of f l F L最重要的是，以下所有内容都是有效的浮点文字，意思是“零”：
0。
0.0
0.0
（你的“100”将是一个有效的
floating-constant，因为它是一个decimal-floating-constant由一个fractional-constantdecimal-floating-constant组成（省略了可选的exponent-part和floating-suffix）;它是一个digit-sequence后跟一个句点，对于一个fractional-constant有效，如该noteable定义的第二行。）Because section 6.4.4.2 of the language standard, "Floating constants" , defines them thusly:
floating-constant: decimal-floating-constant hexadecimal-floating-constant decimal-floating-constant: fractional-constant exponent-part(opt) floating-suffix(opt) digit-sequence exponent-part floating-suffix(opt) hexadecimal-floating-constant: hexadecimal-prefix hexadecimal-fractional-constant binary-exponent-part floating-suffixopt hexadecimal-prefix hexadecimal-digit-sequence binary-exponent-part floating-suffix(opt) fractional-constant: digit-sequence(opt) . digit-sequence digit-sequence . exponent-part: e sign(opt) digit-sequence E sign(opt) digit-sequence sign: one of + - digit-sequence: digit digit-sequence digit hexadecimal-fractional-constant: hexadecimal-digit-sequence(opt) . hexadecimal-digit-sequence hexadecimal-digit-sequence . binary-exponent-part: p sign(opt) digit-sequence P sign(opt) digit-sequence hexadecimal-digit-sequence: hexadecimal-digit hexadecimal-digit-sequence hexadecimal-digit floating-suffix: one of f l F LBottom line, all of the following would be valid floating point literals meaning "zero":
0.
.0
0.0
(Your "100." would be a valid
floating-constant, as it is adecimal-floating-constantconsisting of afractional-constant(omitting the optionalexponent-partandfloating-suffix); it is adigit-sequencefollowed by a period, which is valid for afractional-constantas by the second line of that noteable's definition.)
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