Usage on the Android devices #69
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Hello, I was able to succesfully compile PROJ 9.x + PROJ-JNI 2.0 library.
Problem As I'm not well skilled with C code, I'm still unable to find out why and where this happens. Appreciate and help, thanks! |
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Replies: 6 comments 3 replies
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I do not really know, since I have few experience in Android development. The Android API documentation suggests that this method exists and has the expected signature. There is a test that we could do. In the jclass c = env->FindClass("java/util/logging/Logger");
if (c) {
java_method_log = env->GetMethodID(c, "log", "(Ljava/util/logging/Level;Ljava/lang/String;)V");
if (java_method_log) {
c = env->FindClass("java/util/logging/Level");
if (c) {
java_field_debug_level = env->GetStaticFieldID(c, "FINE", "Ljava/util/logging/Level;");
if (java_field_debug_level) {
java_method_getLogger = env->GetStaticMethodID(caller, "logger", "()Ljava/util/logging/Logger;");
}
}
}
}Try to add another If it doesn't work, you can try to comment-out the whole above block. PROJ-JNI should still work with only logging disabled. |
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Amazing, thanks! You pointed to the correct place. When this block is commented, it works as expected (except that the PROJ has the problem to find proj.db, but this is a solvable problem). Thanks again for the help, I'm moving forward. |
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Alternatively I pushed a commit where I try to change the initialization order. This is only a guess, I have not idea if it has any incidence for Android. If you have a chance, would it be possible to test? Commit: 6be80ee |
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Hello, thanks, appreciate your help. Changes you made do not help here anyway, same error. I believe that the problem is in a different place. In Android, native libs are usually built by Android.mk where logger may be added by Anyway, as I wrote, with commenting problematic block, all seems to work for now and this is a sufficient solution for me for now. Thanks! |
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@menion would you be able to give any details about how you modified NativeResource to properly load the library? I am also trying to get PROJ JNI to compile for Android and am running into the issue where it fails to find my libproj-binding.so file. |
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how to implement this lib in the android app? Please give steps |
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Hello. As fair as I know, the current maintainers of PROJ-JNI are not familiar with Android development. A step-by-step guide would need to be written by other volunteers, maybe on a wiki page if someone is willing to take this task. |
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@desruisseaux Any update on this? |
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No work that I'm aware of. Do you have the same issue as described above, i.e. |
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I do not really know, since I have few experience in Android development. The Android API documentation suggests that this method exists and has the expected signature.
There is a test that we could do. In the
bindings.cppfile, around lines 248 to 260 there is this code: