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

...n emulator comes up on the screen. But even after waiting for as long as 2-3 hrs, all it shows is a black screen. Not even the android home screen or the android logo. Just a black screen. And while initially "adb devices" shows the emulator as offline.after 2-3 minutes the list of attached devices ...
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ALTER TABLE to add a composite primary key

...y. – Adrian Cornish Jan 14 '12 at 1:30 37 @David: it's a single primary key composed of multiple ...
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UITextField - capture return button event

...4 Fattie 33.2k4949 gold badges305305 silver badges562562 bronze badges answered Jun 10 '09 at 17:05 Ilya Suzda...
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How do I upgrade my ruby 1.9.2-p0 to the latest patch level using rvm?

My current version of ruby is ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-darwin10.5.0] but I want to update it to the latest patch level using rvm. How can I do this? ...
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Check free disk space for current partition in bash

... answered Nov 13 '11 at 8:38 MatMat 183k3333 gold badges357357 silver badges373373 bronze badges ...
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How do I properly escape quotes inside HTML attributes?

... 355 " is the correct way, the third of your tests: <option value=""asd">t...
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What are the drawbacks of Stackless Python? [closed]

...s to be believed) and compatible with it (at least versions 2.5, 2.6 and 3.0). 4 Answers ...
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How do I rename the extension for a bunch of files?

... 390 For an better solution (with only bash functionality, as opposed to external calls), see one o...
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How can I calculate the difference between two dates?

How can I calculate the days between 1 Jan 2010 and (for example) 3 Feb 2010? 9 Answers ...
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Extract only right most n letters from a string

... answered Nov 12 '09 at 13:55 Vilx-Vilx- 94.5k7777 gold badges252252 silver badges390390 bronze badges ...