Failed to install DroidIPCam.apk on device 'emulator-5554': timeout

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错误提示：Failed to install helloworld.apk on device 'emulator-5554': timeout或者the user data image is used原因：由于模拟器已经开启而没有关闭或者非法关闭引起的。解决方法：删除 C:\Documents and Settings\Administrator\.android\avd\对应版本.avd下所有以.lock结尾的文件夹。或者Failed to install *.apk on device *:timeout Launch canceled!  还有一种办法：在window->preferences->Android->DDMS->ADB connection time out (ms): 将这个值设置的大一些，默认为5000，我设置成500000，然后就OK了。我有一次试N种方法都解决不了，后来就是用这个办法解决的。 1. Cleaning the project (Project->Clean)2. Restarting device, Eclipse, laptop, all of the above...3. Moving the project to a location without spaces, according to Failed to install apk on device 'emulator-5554': timeout <