Android Support about libplctag HOT 6 CLOSED

The C runtime environment of Android has diverged from that of "stock" Linux so this might be a bit more challenging than a "pure" POSIX system. I will look into it when I get a chance. However, my current priority is working on version 2.0 which has a very different internal structure so I probably will not be able to get to this for a while.

I will keep this in mind as I work on 2.0 and hopefully I can make sure that the Android port will be fairly painless.

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Understood. But by "a while", do you mean months or years?

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Months. Hopefully only a few. I am really busy right now and the 2.0 code
is taking a lot longer than I had hoped.

On Sun, Feb 14, 2016 at 7:52 PM nmnhero [email protected] wrote:

Understood. But by "a while", do you mean months or years?

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I am moving to a CMake-based build system. I think this will help isolate platform dependencies, but I have only just managed to get Linux builds working.

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@kyle-github I just compiled this with Termux, the only thing I had to change was to replace pthread_cancel() with pthread_kill() since Android's standard C library (Bionic) doesn't have pthread_cancel(). I can't test though, I can't get the dang OpenVPN app to work.

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To find all Android related deficiencies in any of the new plctag library releases, these would probably be the good steps to follow in Android Studio:

• Start a new Android Studio project

• Select "Native C++" template

• Choose Name / PackageName / Location, Java Language (or Kotlin) and Minimum SDK

• On the next screen "Customize C++ Support" select "Toolchain Default" (or if you know what you are doing one of C++11 / C++14 / C++17)

• In the newly created project, remove CMakeLists.txt and native-lib.cpp files from the "cpp" folder as well as all related entries in the MainActivity.java and activity_main.xml layout

• Copy all your libplctag project files and folders to the "cpp" folder

• Copy Tag.java file from the library project, wrappers/java/libplctag folder, to the folder where the MainActivity.java file is (normally app/src/main/java/{PackageName folders}). Modifications are needed to this file in order to make it usable:

  1. Change package from "libplctag" to your PackageName (which might be: com.example.plctagtest)

  2. Change all the jna imports to read "com.sun.jna" instead of "dev.java.net.jna"

  3. Remove "void" from: private static native int plc_tag_get_lib_version(void);

  4. Replace "private static native int plc_tag_check_lib_version(int encoded_version);" with "private static native int plc_tag_check_lib_version(int req_major, int req_minor, int req_patch);"

  5. Comment out the following entries, which are at the beginning of the class:
     public static final String JNA_LIBRARY_NAME = "plctag";
     public static final NativeLibrary JNA_NATIVE_LIB = NativeLibrary.getInstance(Tag.JNA_LIBRARY_NAME);
     Native.register(Tag.JNA_LIBRARY_NAME);
     System.err.printLn("Library must be compatible with version 2.1.0!");
     System.abort();

        You should instead register the library in your MainActivity with:  static { Native.register(Tag.class, "plctag"); }
     

• Download jna.aar file: https://github.com/java-native-access/jna/blob/master/dist/jna.aar

• On the menu click File/Project Structure, in the new window select Modules, click "+", select "Import .JAR/.AAR package" and browse to the download location to select the file

• Add to the app's build.gradle file "implementation project(':jna')" as a part of the "dependencies"

• On the menu click File/Save All and then File/Sync Project with Gradle Files

• Build/Rebuild Project (infrequent use of Build/Refresh Linked C++ Projects, File/Invalidate Caches / Restart might also help)

One of the first errors might be related to the deleted native-lib.cpp, so just do Build/Rebuild Project again.

Plctag related errors should be within CMakeLists.txt file, related to "examples" and "tests".

Otherwise the library should compile fine.

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