Write audio streaming code (Android microphone => PC)

Would like to have some code to stream audio (using android's microphone input) between android and a pc. The PC (server) will run Java, and the sound should be of good quality (no interruptions/echo - except for network problems of course) and run on old android versions (possibly API 8). Ideally, the java server code should also record the audio as wav in real time. There is no need for an interface, only code/console necessary (as long as the code is tested and working). TCP or UDP makes little difference, but ideally it should allow to downsample for low connections (i.e. offering a sample rate variable)