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How to check programmatically if an application is installed or not in Android?

... Try with this: public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Add respective layout setConten...
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How can I reset or revert a file to a specific revision?

... Assuming the hash of the commit you want is c5f567: git checkout c5f567 -- file1/to/restore file2/to/restore The git checkout man page gives more information. If you want to revert to the commit before c5f567, append ~1 (where 1 is the number of commits you want...
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Timeout a command in bash without unnecessary delay

This answer to Command line command to auto-kill a command after a certain amount of time 23 Answers ...
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How do I position one image on top of another in HTML?

...ing to avoid compositing (with ImageMagick and similar) due to performance issues. 10 Answers ...
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Best way to detect when a user leaves a web page?

What is the best way to detect if a user leaves a web page? 8 Answers 8 ...
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bool to int conversion

How portable is this conversion. Can I be sure that both assertions pass? 4 Answers 4 ...
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What is the default location for MSBuild logs?

I am using Visual Studio Express 2012. Where is the location of the log file? I have searched in the folder where my solution and projects are stored, but cannot find any .log file. ...
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Xcode: What is a target and scheme in plain language?

Yeah the title says it :-) What do they mean in plain English language? I really don't understand the explanation on Apple's website and I need to rename my target and I'm afraid that nothing works after that.. ...
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In Java, when should I create a checked exception, and when should it be a runtime exception? [dupli

... There's a LOT of disagreement on this topic. At my last job, we ran into some real issues with Runtime exceptions being forgotten until they showed up in production (on agedwards.com), so we resolved to use checked exceptions exclusively. At...
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How to define hash tables in Bash?

What is the equivalent of Python dictionaries but in Bash (should work across OS X and Linux). 15 Answers ...