Only for Android series models, the default use of Oreader to open txt document garbled solution;
The default use of Simplified Chinese encoding, can be adapted to most txt documents, if there are still garbled, you can try to replace the other encoding:
Open the document — Settings - set the code page
Chinese encoding: GB2312 encoding, Simplified Chinese
The BIG5 encoding is traditional
And UTF-8, big5, etc.