![]() ![]() Here’s how you’d use curl and jsoncpp for example (and automatically pull in the implicit OpenSSL dependency that curl has): With version 4.0 of the Android Gradle Plugin, we’ve addressed these issues by adding support for distributing and exposing native libraries through the same mechanism that you do for Java libraries: Android Archives (AARs). Libraries often depend on other libraries, leaving users to chase them down and start the process again.For example, Unix shell scripts won’t run on Windows. Libraries may not build on the user’s machine.Libraries are sometimes built by a build system that Android doesn’t support.Android-specific build scripts are often out of date and no longer work.Libraries don’t always distribute prebuilt binaries for Android, so users must either build the library themselves or rely on (potentially untrustworthy) prebuilt binaries found elsewhere on the web.Library authors need to maintain support for both ndk-build and CMake (and hope that their users are using one of those two options and not something else).Public class MainActivity extends AppCompatActivity // Return file info as string.One thing that NDK users struggle with is managing native dependencies: You can get Uri of a file using Mediastore APIs or by using file picker kind of UI.Ī simple image picker can be implemented in an Activity like this Let’s start with reading image file’s Uri. It’s more scalable to deal with Uri in Android. This is good for users! Good thing is you can still ask user to grant permissions to specific files like by using a file picker. ![]() TL DR is without asking excessive permissions you cannot access files directly anymore. I hope you are also familiar with scoped storage concepts in Android.īasically for improved protection to app and user data on external storage Android has tightened how applications can access files on Android. If you are reading this article I expect you to be familiar with concepts like fundamentals of Android development, NDK, Java Native Interface (JNI) et cetera. Please let me know if that is indeed the case. I have been told not everyone is interested in the why part that usually I go on about. Why read the image in native layer to begin with? These terms interchangeably in the article.Īlso, while the article is primarily about reading image files in C++ - the concepts can easily be extrapolated to reading any file format in native layer in Android.īefore getting started with steps and code examples, there is yet another elephant in the room that needs to be addressed. If you have such circumstances - this article is for you!įYI, When I say “native layer” or “native code” it means in C++ code. However, under certain circumstances you may want to read the image directly in the native layer.
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