Failed to install xxxx.apk on device ' emulator-5554!

Exception Information :[helloandroid] performing com.example.helloandroid.HelloAndroid activity launch[helloandroid] Uploading helloandroid.apk onto device ' emulator-5554 ' [helloandroid] installing helloandroid.apk ... [Helloandroid] Failed to install helloandroid.apk on device ' emulator-5554! [Helloandroid] (NULL) [Helloandroid] Launch canceled! A similar question is: 1: Relatively low machine configuration 2: Re-deploy the Android development environment 3: Restart Eclipse and emulator, or create a new emulator, or restart your computer 4: Unplug the USB flash drive 5: Wait for half to see Workaround: 1, run in cmd:adb kill-server (kills ADB process, if not killed, you need to go to the computer's task Manager to end the Adb.exe process yourself) 2, and then run:adb start-server (restart ADB process), That's it, you can now try to run your program and see if you can, and certainly not rule out other situations (such as the need to restart Eclipse and the emulator)

Failed to install xxxx.apk on device ' emulator-5554!