Technical answers from my Stack Overflow history, with source links and licenses.
Showing 30 of 268 answers
Exported May 9, 2026
This question reminds me of the discussion in this popular answer from Why is char[] preferred over String for passwords? As noted in comments, it's possible that arrays being moved by the garbage collector will leave...
In AOSP ids normally use underscores. address_id instead of addressId . I have seen attributes use camelCase in AOSP however. That is the best practice. This is from the Code Style Guidelines for Contributors for AOSP:...
You should get the value of "ro.build.product". This is how you should get the codename of a device:
Why is this happening? Drawables share a ConstantState when created from a resource and AppCompat uses setColorFilter to backport tinting. So, when you open a new Activity, TintManager sets a ColorFilter on the Drawable...
Getting the package-name of the app that started your Activity: Getting the app name that started your Activity: Notes: Tested by creating an activity with the following intent filter: Opened Gmail -> composed a new...
Running this from the command-line worked for me: If it returns 0 or 2 the device is in portrait. If it returns 1 or 3 the device is in landscape. Note: I am on a rooted device and have busybox with grep , awk , and...
This is probably the best resource for finding custom views and libraries: https://android-arsenal.com/tag/76 Not recommended, but you could use a GIF on Android or make it into an AnimationDrawable.
Inner classes will be compiled and the class file will be ClassName$InnerClassName . See: https://stackoverflow.com/a/11388863/1048340 You need to escape the dollar sign character in Kotlin. The following will work:...
\S matches any non-whitespace character (equal to [^\r\n\t\f\v ] ). I am no regex ninja, but this should work: ^[A-Za-z][A-Za-z ]{0,7} . See: https://regex101.com/r/xQe81c/4
Using adb shell pm grant [PACKAGE_NAME] android.permission.PACKAGE_USAGE_STATS worked for me on several devices. Make sure you added the following to the AndroidManifest : I was also able to use root to grant the...
Pixels. Always assume pixels and convert to dp if needed. See RecyclerView#dispatchOnScrolled:...
Change to The >> appends to a file or creates the file if it doesn't exist. The > overwrites the file if it exists or creates it if it doesn't exist. https://serverfault.com/a/196735
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...
The method is hidden with @hide . The method also requires the system permission android.Manifest.permission.MANAGE_USERS . This permission cannot be granted to third-party apps. UserManager#getUsers() documentation:...
If I remove all spans before setting the new ForegroundColorSpan then I get the desired behavior. Unfortunately, this is a lot more work if an EditText has a lot of text. What I did for a fix: I'm not sure what changed...
You can use ^[^ ]+ . Example: See: https://regex101.com/r/aZYgvC/1
You can use the following method to get a darker primary color: Example:
You would need to use the application's resources to load the theme. I have answered this in another thread here: https://stackoverflow.com/a/41948943/1048340 Here is an example where the package "com.example.theme" is...
we aren't sure if there is a way to still use the same Application ID and SKUs defined for our main app when trying to purchase something related only to the SDK part of the code This would not work because each app...
R.java does not contain methods, only static fields. There is a 65,536 limit on both methods and fields but they are separate. 99% of the time you will hit the method limit before hitting the field limit. If you need...
You need to escape the original special character:
Unless you are Chuck Norris or Jon Skeet, you shouldn't use RegEx to match HTML. I would suggest using Jsoup . Here is an example using the string from your question:
Change To The design library has the recycler view as a dependency. You also have a duplicate AppCompat. Make sure all support library versions are the same.
It looks like goBack(View) is most likely from an onClick setup in your layout XML. Since you aren't using the view, just pass null :
Add the following intent-filter to the relevant activity tag in your AndroidManifest : Add the following code in onCreate(Bundle) to check if the Activity was started from another app: Note: File managers might use...
Create a class where you can keep a strong reference to a Target . Full working example:
AppCompat resources can change in future updates. You should put a close button in your resources and use that drawable instead. If you want to make the current drawable white, then you can apply a ColorFilter ....
The app will be installed but a SecurityException will be thrown if you use a permission the system cannot grant. You can read more about permissions here: System Permissions | Android Developers
I've used Natty Date Parser for this. You can try it out here . It is available on maven central here . If you are using gradle: Example usage: Output: Sat Oct 10 20:51:10 PDT 2015 Sat Oct 10 20:51:10 PDT 2015 Fri Oct...
The constructor for BrowseAdapter calls the parent constructor ( see ArrayAdapter.java lines 154-164 ). The parent constructor creates a list of items ( see lines 175-182 ). Items are added to the adapter which adds...