我有一个服务器,上面存储了多张图片,大小从1.5 kb到9 Mb不等。这些图片来自于电脑、平板和手机。服务器使用Base64编码将它们转换成字符串,然后发送给安卓客户端。但是其中一张300 kb的图片在使用 BitmapFactory.decodeByteArray 解码时会返回 null… 而且这张图片在在线解码器中被成功解码。
byte[] decodedString = Base64.decode(image64, Base64.DEFAULT);
Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, ecodedString.length);
我已经两天找不到答案了。
有什么想法吗?谢谢!
P.S.
private boolean decodeImage64(String uid, String image64, String name) {
Bitmap decodedByte;
boolean result = false;
if (image64 != null && !image64.isEmpty()) {
try {
Log.e(TAG, "decodeImage64: image64.getBytes().length = " + image64.getBytes().length);
byte[] decodedString = Base64.decode(image64, Base64.DEFAULT);
Log.e(TAG, "decodeImage64: decodedString = " + decodedString + " , decodedString.length = " + decodedString.length);
decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
Log.e(TAG, "decodeImage64: decodedByte = " + decodedByte);
if (decodedByte != null) {
FileOutputStream out = null;
try {
out = new FileOutputStream(getImageFolderName() + "/" + uid + ".png");
decodedByte.compress(Bitmap.CompressFormat.PNG, 100, out);
decodedByte.recycle();
out.close();
} catch (Exception e) {
Log.e(TAG, Log.getStackTraceString(e));
} finally {
try {
if (out != null) {
out.close();
}
if (decodedByte != null){
decodedByte.recycle();
}
} catch (IOException e) {
Log.e(TAG, Log.getStackTraceString(e));
}
}
result = true;
}else {
Log.e(TAG, " !!!!!!!!!!!!!!!!!!!!!!! decodeImage64: decodedByte = null " + name);
}
}catch (Exception e){
Log.e(TAG, Log.getStackTraceString(e));
}
} else {
Log.e(TAG, "decodeImage64: image = null " + name);
}
return result;
}
而logcat
良好的图像:
06-29 02:33:57.465 18197-18584/cps.agrovisio E/myLogs: ------------------------- doInBackground: Good photo
06-29 02:34:13.993 18197-18584/cps.agrovisio E/myLogs: decodeImage64: image64.getBytes().length = 2264744
06-29 02:34:14.085 18197-18584/cps.agrovisio E/myLogs: decodeImage64: decodedString = [B@bb8956d , decodedString.length = 1676499
06-29 02:34:14.635 18197-18584/cps.agrovisio E/myLogs: decodeImage64: decodedByte = android.graphics.Bitmap@a6d05a2
图像质量差:
06-29 02:33:56.041 18197-18584/сps.agrovisio E/myLogs: ------------------------- doInBackground: Bad photo
06-29 02:33:57.177 18197-18584/cps.agrovisio E/myLogs: decodeImage64: image64.getBytes().length = 372570
06-29 02:33:57.194 18197-18584/cps.agrovisio E/myLogs: decodeImage64: decodedString = [B@abcf243 , decodedString.length = 275799
06-29 02:33:57.245 18197-18584/cps.agrovisio E/myLogs: decodeImage64: decodedByte = null