Der Vorteil der Tests im Browser. Mark one of the first two microphone tests. Step 1: Open Near Ultrasound Microphone Tests on both devices: Test device: Reference device: Step 2: After opening the test, press RECORD on the test device, then quickly press PLAY on the reference device. Android 11 changes to foreground services and mic access, remember its just a trigger; Android 11 requires manifest dec and foregroundServiceType(80) (microphone) inconsistent behaviour with widget and jammer service state; Android 8.x service crashes specifically to its API; testing Active Jammer as external voice assistant jammer. Thus, the “Android Secret Codes” exist for this sole purpose. 16. With these or Hidden Menus, you can make your Android phone perform certain tasks. How do you close/hide the Android soft keyboard using Java? Here is the screenshot from the hardware test of Android smartphones. Barcode and QR Code Scanner 2. Make a phone call. Accelerator Test & Info. With the help of these android secret codes, you can easily get access to hidden features like Network local test, IMEI detail, RAM Details, Bluetooth Test, etc. Possible duplicate of How to use the microphone on Android – Viktor Yakunin May 31 '16 at 9:35 make a sound recorder, and play the recorded sound, if it plays , then it is working, make something that user will judge that. Nokia’s mobile codes are numerous anyway. Do you know you can use hidden secret codes to run the hardware test in an Android smartphone? I'm working on a diagnosis app, I want to know how can I test that the microphone is working properly? Why do most guitar amps have a preamp and a power amp section? I READ HERE that using microphone might be possible in android emulator so I decided to try it out (Although an answer to THIS QUESTION says it's not possible) I copy/pasted the code provided in the ANDROID DEVELOPERS WEBSITE and added