Technical answers from my Stack Overflow history, with source links and licenses.
Showing 30 of 231 answers tagged android
Exported May 9, 2026
There was a warning about the Android SDK location having spaces in the path. Once I moved the SDK to a location without spaces and updated the SDK location in Android Studio I was then able to update the Java JDK...
Finding how to change styles for widgets on Android has always been troublesome. For example, DatePickerDialog has different styles for Holo and Material design. So, the style of the dialog may depend on the SDK value...
TextInputLayout relies on resources/attributes in AppCompat. You need to use an AppCompat base theme. The AppCompat themes are a parent of the Material based themes on API 21+. So, you will be using the Material theme.
This is like Phil's answer except it doesn't need the context:
You can set the EdgeEffect color of the ViewPager with some reflection:
You need to build the jar and then add it to your libs folder in your project. How to build the jar: source Here is a YouTube video if that would help: https://www.youtube.com/watch?v=5bwn7DYt2AI You can also download a...
This most likely has to do with the size of classes.dex. On anything pre-ICS dexopt will fail on anything over 5mb. Check the size of classes.dex in your apk. It would also be good to see what your method count is as...
The answer from Emil Davtyan is good, but network types have been added that are not accounted for in his answer. So, isConnectionFast(int type, int subType) may return false when it should be true. Here is a modified...
It currently is not possible to get the foreground app on Android 5.1.1+ unless you are granted the system level permission android.permission.PACKAGE_USAGE_STATS . Note that several major vendors have removed the...
You can parse JSON keys with whitespace with Gson by using SerializedName annotation. Example:
To get a list of all permissions using adb, you will need to add the -g flag. If you look at the source code , this adds null to the list of groups. As you pointed out, PackageManager#getAllPermissionGroups(int) does...
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) :...
I needed to do this dynamically. Using reflection: You will need to call textInputLayout.setErrorEnabled(true) before invoking the above method for this to work.
Check out this section from developer.android.com: In native languages like C++ it's common practice to use getters (i = getCount()) instead of accessing the field directly (i = mCount). This is an excellent habit for...
I wrote a utility class to get the UID/GID name by hardcoding values from android_filesystem_config.h . Usage: AndroidFilesystemConfig.java Using Reflection: Inspired by odexide's answer, here is some really ugly...
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
If you look at the source code for android.os.Environment you will see that Android relies heavily on environment variables for paths. You can use the "SECONDARY_STORAGE" environment variable to find the path to the...
The overflow menu item doesn't have a resource id. I found the overflow view by traversing the toolbar. The debugger showed an id of -1 and the Hierarchy Viewer showed no resource-id. Here is how I found the overflow...
I know this is old, but I thought I would share my solution for anyone else who comes across this. You can use a custom RequestHandler . Here is a RequestHandler I wrote for loading app icons using Picasso : Usage...
This was a problem with ADB. ADB use to verify that the file was an APK and read the entire file into memory before installation. This could cause mallac to return NULL , closing your ADB session (see file_sync_client.c...
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.
Setting the Drawable from styles is the way to go. However, if you want to do this programmatically here are two methods that should be useful:
I have several library projects with the same package name specified in the AndroidManifest (so no duplicate field names are generated by R.java). I had to remove any permissions and activities from the...
You can use an unconditional loop: You can also look into tools like inotifywait or fsmon depending on what you are trying to accomplish. You can also install busybox for Android which contains the watch command.
You can query MediaStore for a directory size on internal storage. This is much faster than a recursive method getting the length of each file in a directory. You must have READ_EXTERNAL_STORAGE permission granted....
So, what should I do to use a theme from different package resource? You shouldn't do this for many reasons. I wrote a simple project that shows that it is indeed possible as long as the package contains the resources...
If I understand your question correctly, you have an Activity named Preferences which extends PreferenceActivity . You also have a Fragment that has registered an OnSharedPreferenceChangeListener . You need to update...
Here is an example of creating a database in your cache directory: All you need to do is pass the absolute path as the name parameter in the constructor. Tested just to make sure it was created in...
I created the following shell script name it pullsharedprefs.sh (or whatever you want) and from terminal run the command: shared_prefs will be pulled to the current working directory and named...