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base64 decoding of text not working in flutter but working in Java android #64871

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verinder84 opened this issue Aug 29, 2020 · 2 comments
Closed

base64 decoding of text not working in flutter but working in Java android #64871

verinder84 opened this issue Aug 29, 2020 · 2 comments

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@verinder84
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verinder84 commented Aug 29, 2020 •
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i have a base64 utf8 text data stored in server

base64 text is -

String post_data =
"4Kiu4KioIPCfkYfgqK7gqKTimJ3vuI8K4Kis4KmH4Kis4KmHIOCorOCovuCoquCpgiDgqJzgqL/g\nqbDgqKbgqJzgqL7gqKjinaPvuI8K4Ki44KmB4Kit4Ki+4KiFIOCorOCph+CorOCphyDgqLXgqLDg\nqJfgqL7gpaQK4Kic4Ki/4Kmw4KiuIOCosuCoteCosCDwn5KqCuCoheCouOCpguCosuCovuCogiDg\nqKbgqYcg4Kiq4Kmx4KiV4KmH4KWkCuCoquCpgCDgqKzgqYAgMDkg4KiG4Kiy4Ki84KmHCuCorOCo\nueCpgeCopCDgqJbgqYHgqLjgqLwg4Kiw4Kmx4KisIOCopuCpgCDgqLDgqJzgqLzgqL4g4Ki14Ki/\n4KiaIOClpArgqKbgqL/gqLIg4Kio4KmC4KmwIOCouOColeCpguCoqCDgqJfgqYHgqLDgqYIg4KiY\n4KiwIOConOCoviDgqJXgqYfgpaQK8J+Zj/CfmY8="

the above text encoded using code below->

byte[] data = new byte[0];
data = ps.getData().getBytes("UTF-8");
 String base64String = Base64.encodeToString(data, Base64.DEFAULT);

in android I decode the above text using java as code below->

byte[] data;
String newStringWithEmojis=null;
 data = Base64.decode(post_data, Base64.DEFAULT);
 newStringWithEmojis = new String(data, "UTF-8");

the above shown decoding and encoding of given text is working fine in android using java.

But in flutter
base64.decode(post_data ) function not working
and give exception

EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
The following FormatException was thrown building PostItem(dirty, state: _PostItemState#0d2cc):
Invalid character (at character 77)
4Kiu4KioIPCfkYfgqK7gqKTimJ3vuI8K4Kis4KmH4Kis4KmHIOCorOCovuCoquCpgiDgqJzgqL/g

When the exception was thrown, this was the stack:
#0 _Base64Decoder.decodeChunk (dart:convert/base64.dart:694:7)
#1 _Base64Decoder.decode (dart:convert/base64.dart:618:14)
#2 Base64Decoder.convert (dart:convert/base64.dart:498:26)
#3 Base64Codec.decode (dart:convert/base64.dart:82:47)
#4 _PostItemState.build (package:flutterapp/PostItem.dart:28:31)
#5 StatefulElement.build (package:flutter/src/widgets/framework.dart:4663:28)
#6 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4546:15)
#7 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#8 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#9 StatefulElement.update (package:flutter/src/widgets/framework.dart:4751:5)
#10 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#11 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#12 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#13 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#14 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#15 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#16 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#17 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#18 StatefulElement.update (package:flutter/src/widgets/framework.dart:4751:5)
#19 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#20 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#21 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#22 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#23 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#24 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#25 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#26 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#27 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#28 StatelessElement.update (package:flutter/src/widgets/framework.dart:4627:5)
#29 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#30 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#31 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#32 ProxyElement.update (package:flutter/src/widgets/framework.dart:4906:5)
#33 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#34 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#35 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#36 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#37 StatefulElement.update (package:flutter/src/widgets/framework.dart:4751:5)
#38 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#39 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#40 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#41 StatelessElement.update (package:flutter/src/widgets/framework.dart:4627:5)
#42 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#43 SliverMultiBoxAdaptorElement.updateChild (package:flutter/src/widgets/sliver.dart:1164:36)
#44 SliverMultiBoxAdaptorElement.performRebuild.processElement (package:flutter/src/widgets/sliver.dart:1082:34)
#45 Iterable.forEach (dart:core/iterable.dart:283:30)
#46 SliverMultiBoxAdaptorElement.performRebuild (package:flutter/src/widgets/sliver.dart:1122:24)
#47 SliverMultiBoxAdaptorElement.update (package:flutter/src/widgets/sliver.dart:1052:7)
#48 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#49 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#50 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#51 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#52 StatefulElement.update (package:flutter/src/widgets/framework.dart:4751:5)
#53 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#54 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#55 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#56 RenderObjectElement.updateChildren (package:flutter/src/widgets/framework.dart:5566:32)
#57 MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6001:17)
#58 _ViewportElement.update (package:flutter/src/widgets/viewport.dart:213:11)
#59 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#60 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#61 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#62 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#63 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#64 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#65 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#66 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#67 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#68 StatelessElement.update (package:flutter/src/widgets/framework.dart:4627:5)
#69 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#70 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#71 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#72 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#73 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#74 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#75 StatefulElement.update (package:flutter/src/widgets/framework.dart:4751:5)
#76 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#77 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#78 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#79 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#80 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#81 StatelessElement.update (package:flutter/src/widgets/framework.dart:4627:5)
#82 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#83 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#84 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#85 ProxyElement.update (package:flutter/src/widgets/framework.dart:4906:5)
#86 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#87 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#88 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#89 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#90 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#91 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#92 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#93 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#94 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#95 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#96 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#97 StatelessElement.update (package:flutter/src/widgets/framework.dart:4627:5)
#98 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#99 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#100 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#101 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#102 StatefulElement.update (package:flutter/src/widgets/framework.dart:4751:5)
#103 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#104 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#105 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#106 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#107 StatefulElement.update (package:flutter/src/widgets/framework.dart:4751:5)
#108 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#109 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#110 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#111 ProxyElement.update (package:flutter/src/widgets/framework.dart:4906:5)
#112 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#113 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#114 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#115 StatelessElement.update (package:flutter/src/widgets/framework.dart:4627:5)
#116 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#117 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#118 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#119 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#120 StatefulElement.update (package:flutter/src/widgets/framework.dart:4751:5)
#121 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#122 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#123 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#124 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#125 StatefulElement.update (package:flutter/src/widgets/framework.dart:4751:5)
#126 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#127 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#128 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#129 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#130 StatefulElement.update (package:flutter/src/widgets/framework.dart:4751:5)
#131 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#132 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#133 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#134 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#135 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#136 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#137 StatefulElement.update (package:flutter/src/widgets/framework.dart:4751:5)
#138 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#139 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#140 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#141 StatelessElement.update (package:flutter/src/widgets/framework.dart:4627:5)
#142 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#143 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#144 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#145 ProxyElement.update (package:flutter/src/widgets/framework.dart:4906:5)
#146 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#147 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#148 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#149 ProxyElement.update (package:flutter/src/widgets/framework.dart:4906:5)
#150 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#151 RenderObjectElement.updateChildren (package:flutter/src/widgets/framework.dart:5566:32)
#152 MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6001:17)
#153 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#154 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#155 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#156 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#157 StatefulElement.update (package:flutter/src/widgets/framework.dart:4751:5)
#158 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#159 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#160 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#161 ProxyElement.update (package:flutter/src/widgets/framework.dart:4906:5)
#162 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#163 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#164 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#165 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#166 StatefulElement.update (package:flutter/src/widgets/framework.dart:4751:5)
#167 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#168 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#169 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#170 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#171 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#172 StatelessElement.update (package:flutter/src/widgets/framework.dart:4627:5)
#173 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#174 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#175 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#176 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#177 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#178 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#179 StatefulElement.update (package:flutter/src/widgets/framework.dart:4751:5)
#180 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#181 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#182 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#183 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#184 StatefulElement.update (package:flutter/src/widgets/framework.dart:4751:5)
#185 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#186 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#187 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#188 ProxyElement.update (package:flutter/src/widgets/framework.dart:4906:5)
#189 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#190 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#191 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#192 ProxyElement.update (package:flutter/src/widgets/framework.dart:4906:5)
#193 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#194 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#195 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#196 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#197 StatefulElement.update (package:flutter/src/widgets/framework.dart:4751:5)
#198 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#199 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#200 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#201 StatelessElement.update (package:flutter/src/widgets/framework.dart:4627:5)
#202 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#203 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#204 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#205 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#206 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#207 StatelessElement.update (package:flutter/src/widgets/framework.dart:4627:5)
#208 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#209 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#210 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#211 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#212 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#213 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#214 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#215 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#216 StatefulElement.update (package:flutter/src/widgets/framework.dart:4751:5)
#217 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#218 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#219 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#220 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#221 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#222 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#223 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#224 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#225 StatefulElement.update (package:flutter/src/widgets/framework.dart:4751:5)
#226 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#227 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#228 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#229 StatelessElement.update (package:flutter/src/widgets/framework.dart:4627:5)
#230 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#231 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#232 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#233 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#234 StatefulElement.update (package:flutter/src/widgets/framework.dart:4751:5)
#235 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#236 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#237 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#238 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#239 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#240 ProxyElement.update (package:flutter/src/widgets/framework.dart:4906:5)
#241 _InheritedNotifierElement.update (package:flutter/src/widgets/inherited_notifier.dart:183:11)
#242 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#243 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#244 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#245 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#246 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#247 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#248 StatefulElement.update (package:flutter/src/widgets/framework.dart:4751:5)
#249 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#250 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#251 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#252 ProxyElement.update (package:flutter/src/widgets/framework.dart:4906:5)
#253 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#254 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#255 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#256 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#257 StatefulElement.update (package:flutter/src/widgets/framework.dart:4751:5)
#258 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#259 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#260 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#261 StatelessElement.update (package:flutter/src/widgets/framework.dart:4627:5)
#262 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#263 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:5881:14)
#264 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#265 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#266 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#267 ProxyElement.update (package:flutter/src/widgets/framework.dart:4906:5)
#268 Element.updateChild (package:flutter/src/widgets/framework.dart:3245:15)
#269 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4571:16)
#270 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4719:11)
#271 Element.rebuild (package:flutter/src/widgets/framework.dart:4262:5)
#272 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2667:33)
#273 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:866:20)
#274 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:286:5)
#275 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1117:15)
#276 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1056:9)
#277 SchedulerBinding.scheduleWarmUpFrame. (package:flutter/src/scheduler/binding.dart:865:7)
(elided 4 frames from class _RawReceivePortImpl, class _Timer, and dart:async-patch)
@yuanzhiying
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class Base64Util {
  static final List<String> _base64Char = [
    "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z",
    "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", 
    "0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
    "+", "/",
  ];

  static List<int> base64Decoder(String str) {
    /**
     * 由于后台说sun公司的某些旧的包处理出来的base64字符串包含换行符，所以先将其删除
     */
    str = str.replaceAll("\n", "");
    List<int> list = List();
    /**
     * 由于需要将传入的字符串按4字节分组，需要先判断其长度是否为4的整数倍
     */
    if (str.length % 4 == 0) {
      /**
       * 循环取字符串的字符，每次取4个
       */
      for (int i = 0; i < str.length; i += 4) {
        String char1 = str.substring(i, i + 1);
        String char2 = str.substring(i + 1, i + 2);
        String char3 = str.substring(i + 2, i + 3);
        String char4 = str.substring(i + 3, i + 4);

        /**
         * 将取出的字符按照字码表进行转换成数字，当为等于号时，则不进行处理，因为等于号是填充符
         */
        int code1 = _base64Char.indexOf(char1);
        int code2 = _base64Char.indexOf(char2);
        int code3;
        if ("=" != char3) {
          code3 = _base64Char.indexOf(char3);
        }
        int code4;
        if ("=" != char4) {
          code4 = _base64Char.indexOf(char4);
        }

        /**
         * 将转换后的数字进行分割处理，当对应字符为等于号，则不进行分割处理
         */
        /**
         * 将第一个字节与0x3F，得到低6位，然后左移2位，腾出低2位的位置
         * 然后将第二个字节与0x30，清除高2位和低4位，再右移4位，
         * 与前一个高6位相加，得到第一个新字节
         */
        int decode1 = ((code1 & 0x3F) << 2) + ((code2 & 0x30) >> 4);
        /**
         * 将第二个字节与0x0F，得到低4位，然后左移4位，腾出低4位的位置
         * 然后将第三个字节与0x3C，清除高2位和低2位，再右移2位，
         * 与前一个高4位相加，得到第二个新字节
         */
        int decode2;
        if ("=" != char3) {
          decode2 = ((code2 & 0x0F) << 4) + ((code3 & 0x3C) >> 2);
        }
        /**
         * 将第三个字节与0x03，得到低2位，然后左移6位，腾出低6位的位置
         * 然后直接与第四个字节相加，得到第三个新字节
         */
        int decode3;
        if ("=" != char4) {
          decode3 = ((code3 & 0x03) << 6) + code4;
        }

        list.add(decode1);
        if ("=" != char3) {
          list.add(decode2);
        }
        if ("=" != char4) {
          list.add(decode3);
        }
      }
    }
    return list;
  }

  static String base64Encoder(List<int> list) {
    StringBuffer sb = StringBuffer();
    /**
     * 由于需要将传入的数组按3字节分组，所以先处理3的最大整数倍的长度的内容
     */
    int remainder = list.length % 3;
    int size = list.length - remainder;
    /**
     * 循环取数组里的字节，每次取3个
     */
    for (int i = 0; i < size; i += 3) {
      int code1 = list[i];
      int code2 = list[i + 1];
      int code3 = list[i + 2];
      /**
       * 首先将第一字节右移2位，得到左6位，与上0x3F，高2位置0，得到第一个6位
       * 然后在编码表里进行转码，得到新组的第一字节
       */
      int encode1 = (code1 >> 2) & 0x3F;
      /**
       * 接着将第一字节与0x03，即00000011，得到低2位，然后左移4位，
       * 然后将第二字节右移4位，做加法运算，得到第二个6位，转码得到新组的第二字节
       */
      int encode2 = ((code1 & 0x03) << 4) + ((code2 >> 4) & 0x0F);
      /**
       * 将第二字节与0x0F，即00001111，得到低4位，然后左移2位，
       * 然后将第三字节右移6位，得到高2位，做加法运算，得到第三个6位，转码得到新组的第三字节
       */
      int encode3 = ((code2 & 0x0F) << 2) + ((code3 >> 6) & 0x03);
      /**
       * 最后将第三字节与上0x3F，清除高2位，得到低6位，即第四个6位，转码得到新组的第四字节
       */
      int encode4 = code3 & 0x3F;

      String char1 = _base64Char[encode1];
      String char2 = _base64Char[encode2];
      String char3 = _base64Char[encode3];
      String char4 = _base64Char[encode4];

      sb.write(char1);
      sb.write(char2);
      sb.write(char3);
      sb.write(char4);
    }
    /**
     * 当原文不是3的整数倍时，则需要继续处理多出的1或2个字节
     */
    if (remainder != 0) {
      /**
       * 既然多出内容，那么至少多一个，所以第一字节直接取
       * 对第二字节需要判断
       */
      int code1 = list[size];
      int code2 = 0;
      if (remainder == 2) {
        code2 = list[size + 1];
      }
      /**
       * 新组第一二字节可直接取6位然后转码
       */
      int encode1 = (code1 >> 2) & 0x3F;
      int encode2 = ((code1 & 0x03) << 4) + ((code2 >> 4) & 0x0F);
      String char1 = _base64Char[encode1];
      String char2 = _base64Char[encode2];
      /**
       * 如果原文只多出1字节，那么新组第三字节肯定为0，那么按照规则，空字符用 '=' 代替
       * 如果多出2字节，则还继续进行取6位、转码的运算，
       */
      int encode3;
      String char3 = "=";
      if (remainder == 2) {
        encode3 = (code2 & 0x0F) << 2;
        char3 = _base64Char[encode3];
      }
      /**
       * 由于最多多出2字节，所以新组第四字节肯定没有值可以取，也就是空字符，所以直接转换为 '='
       */
      String char4 = "=";

      sb.write(char1);
      sb.write(char2);
      sb.write(char3);
      sb.write(char4);
    }

    return sb.toString();
  }
}

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@yuanzhiying @verinder84