This paper proposes a portable water quality detector,based on an Android platform,for detecting and protecting water resources. The instrument mainly comprises a sensor probe,slave computer,and an Android smart device. The experimental results showed that the linear detection ranges of COD and DO were 0 to 60 mg·L~(-1)and 4. 5 to 13 mg·L~(-1),with good repeatability. The CV values of COD and DO were 2. 20% and 1. 73%,respectively. The instrument was successfully applied to detect an actual water sample and...