Android emulator shows nothing except black screen and adb devices shows "device offline"

Solution 1:

Update 25.07.2018:

The latest Android Studio version does not have this option anymore. If the problem persists try to switch between the values of the "Emulated Performance" dropdown in the Verify Configuration dialogue (if available) or refer to the Configure Emulator graphics rendering and hardware acceleration.

Update 26.02.2014:

There are two hints in the Configuring Graphics Acceleration chapter from developer.android.com.

Caution: As of SDK Tools Revision 17, the graphics acceleration feature for the emulator is experimental; be alert for incompatibilities and errors when using this feature.

and

Start the AVD Manager and create a new AVD with the Target value of Android 4.0.3 (API Level 15), revision 3 or higher.

So Android 4.0.3 (API Level 15) seems to be the minimum requirement for graphics acceleration.

Original answer

I have had the same issue with the latest Android SDK.

I simply deactivated the checkbox "Use Host GPU" within the settings of the virtual device and it started working again.

The "Use Host GPU" does only work for me with Android 4.2 as "Target".

Solution 2:

I have recently the same issue in emulator, Nexus 5 (Android O). I have go to Android Virtual Device Manager and Wipe User Data and it solved my Problem.

Solution 3:

I had issues with getting the larger devices to emulate (Nexus7 and 10), while the phone sized emulators worked great. Would just keep getting a black screen with nothing for hours with the tablets. What helped was actually the OPPOSITE of what most people here are recommending: after setting the tick box for 'Use Host GPU' and setting the target to the highest android (4.4.2 at the time of this writing) the 7 and 10 work as expected!

Solution 4:

Have you tried the power button :) ... it really worked for me. Actually emulator saves the device state before closing so at the last run if you switched off the device & closed the emulator then in the next run it will load previous state & display switched off phone aka blank screen. Although there might be many other causes of this issue.

Solution 5:

Checking "Wipe user data" in the Launch Options fixed it for me.

Go to Android Virtual Device Manager->Select your device->Start->Check "Wipe user data"->Launch