Technical answers from my Stack Overflow history, with source links and licenses.
Showing 30 of 59 answers tagged java
Exported May 9, 2026
This answer is similar to some answers above. However, I feel that it would be beneficial because, unlike other answers, this will remove any extra commas or whitespace and handles abbreviation.
Here is a method for getting a random color: Benefits: Get the integer representation which can be used with java.awt.Color or android.graphics.Color Keep a static reference to Random .
On many popular devices the market name of the device is not available. For example, on the Samsung Galaxy S6 the value of Build.MODEL could be "SM-G920F" , "SM-G920I" , or "SM-G920W8" . I created a small library that...
In my testing all IMPL classes had the field "pid". This has worked for me: Just make sure the returned value is not -1. If it is, then parse the output of ps .
More info: http://developer.android.com/reference/android/util/Log.html https://developer.android.com/tools/debugging/debugging-log.html Logging libraries: https://android-arsenal.com/tag/57
Using some reflection did the trick for me Java: XML: Here is a method that you can use that doesn't need an XML:
Ted's answer to lighten a color wasn't working for me so here is a solution that might help someone else:
Here is an answer using Jsoup and JSON as dependencies: Output (formatted):
Delete the files in onDestroy if isChangingConfigurations() is false or isFinishing is true . Example:
final It is used in the following three cases: If the final keyword is attached to a variable then the variable becomes constant i.e. its value cannot be changed in the program. If a method is marked as final then the...
Set the user-agent header: Example: Stack Exchange Inbox Reputation and Badges source: https://stackoverflow.com/a/7523425/1048340 Perhaps this is related:...
The other answers are correct; you need to check the length of the string before calling str.substring(1) . However, you don't need another method to maintain the ct variable. Here is a Java 101 appropriate answer:
Possible solution: Testing with your example JSON string: Output: Note: This is not ideal and I just wrote it real quick.
Here is a method to open Settings > Permissions for your application: You should consider using this when your permission is denied and shouldShowRequestPermissionRationale(Activity activity, String permission) returns...
There isn't a magical tool that will refactor obfuscated code into a buildable project. Most likely, you won't be able to decompile and de-obfuscate an APK to be clean and maintainable code. This is a good thing. There...
Change to You are using the value from R.color instead of the value you set in your XML.
Here is a class I wrote. You can create your own material color palette or get a random color. Example uses: MaterialColorPalette.java Just copy the class into your project and add the package declaration.
RecyclerView is not supported to be used as a RemoteView. See CreatingLayout A RemoteViews object (and, consequently, an App Widget) can support the following layout classes: FrameLayout LinearLayout RelativeLayout...
As commented previously, android.os.FileUtils has changed and the solution posted by Ashraf no longer works. The following method should work on all versions of Android (although it does use reflection and if a...
The answer from john sakthi does not work correctly if the Bitmap has transparency (PNGs). I modified the answer for correctly getting the red/green/blue averages while accounting for transparent pixels:
There is no public API to do this. You can however use some dirty reflection to create your symbolic link. I just tested the following code and it worked for me: A quick Google search showed this answer if you don't...
Does your class extend LinkedList ? If so, here is what I would do: It isn't a great idea to extend LinkedList. If you want an easy way to create a new LinkedList with elements use the following method:
Using string.indexOf(s) will get the first occurrence. Instead of having a map of keywords and using indexOf you could use a regular expression. I wrote this up real quick as an example: Screenshot of example EditText...
The outer try-block will still catch exceptions from the inner try-block. The inner try-block is there to make sure DaoUtils.closeStatement(callStmt); is invoked.
A third-party application does not have permission to set a system property. Therefore, the most likely cause of the crash is that the system is setting the package-name as a value for a system property. Other answers...
The problem with @ZsoltBoldizsár's answer is that you are using ActionBarActivity . Change getActionBar() to getSupportActionBar() Add the following code in onCreate(Bundle) after you call super.onCreate(Bundle) :...
ImageIO.read(file) should return a BufferedImage . You can also use PixelGrabber to get a specific color. Example: ToolkitImage also has a method to get the BufferedImage but may return null: Why does ToolkitImage...
You can get a random number between 6 and 10 like this: Here is an example to play a sound every 6 to 10 seconds: Just call playMySound(); in onCreate(Bundle) and toggle mKeepPlaying when you want to stop.