You have to install Text-To-Speech google and download Chinese voice data for system to speak Chinese. Please refer the following website: https://www.androidauthority.com/google-text-to-speech-engine-659528/
This is an application which supports your study of Chinese by learning Ping Ying of each Chinese character. Majority of Chinese Character have one pronunciation; therefore, learning Ping Ying of Chinese character will improve your pronunciation. Pronunciation is the most difficult parts of Chinese I think.
This application contains over 2700 Chinese characters which could be the most of Chinese characters that Chinese people will learn at primary school, I think.
This application is free. Usage is very simple. You can learn total lists of Chinese character. Each lesson contains about 100 Chinese characters. You can also learn the Chinese character by the four tones. When you press Chinese character label or Ping Ying label, the system will pronounce words. You can change the speed of pronunciation by adjusting Text-To-Speech (please refer the above website). You can put difficult mark for Chinese character by pressing "Difficult" button. This is a very simple application. Please try using this.