Use Native Activity build bgfx examples.
bgfx default android build .so, need to use it build .apk.
- Android Studio 2022.(maybe can lower)
- NDK and
ANDROID_NDK_ROOTenv
git clone https://github.com/crossous/native-activity-bgfx.git
cd native-activity-bgfx
git submodule update --init --recursive
Open project in Android Studio.
Before we build, we need to make a few modify.
bgfx example depend asset need to copy to sdcard, it set work space in bgfx.cmake\bgfx\examples\common\entry\entry_android.cpp, find string chdir("/sdcard/bgfx/examples/runtime").
After Android 11+, app can not access sdcard dir, need to access /sdcard/Android/data/<package name>/files.
I can not submit it change to git because this code is submodule, so we modify this code in local repo.
// entry_android.cpp
const std::string GetExtStoragePath()
{
android_app* app = s_ctx.m_app;
ANativeActivity* activity = app->activity;
JNIEnv* env = nullptr;
(*activity->vm).AttachCurrentThread(&env, 0);
jclass clazz = env->GetObjectClass(activity->clazz);
jmethodID methodID = env->GetMethodID(clazz, "getExternalFilesDir", "(Ljava/lang/String;)Ljava/io/File;");
jobject file = env->CallObjectMethod(activity->clazz, methodID, NULL);
jclass fileClass = env->FindClass("java/io/File");
jmethodID getAbsolutePath = env->GetMethodID(fileClass, "getAbsolutePath", "()Ljava/lang/String;");
jobject result = env->CallObjectMethod(file, getAbsolutePath);
jboolean isCopy;
std::string res = env->GetStringUTFChars((jstring)result, &isCopy);
env->DeleteLocalRef(file);
env->DeleteLocalRef(result);
return res;
}
// in MainThreadEntry::threadFunc
//int32_t result = chdir("/sdcard/bgfx/examples/runtime");
const std::string resPath = GetExtStoragePath() + "/bgfx/examples/runtime";
int32_t result = chdir(resPath.c_str());
BX_ASSERT(0 == result
, "Failed to chdir to directory (errno: %d, path: %s, android.permission.WRITE_EXTERNAL_STORAGE?)."
, errno
, resPath.c_str()
);Then build project in Android Studio in Build > Make Project, and install to mobile.
Before you run app you need copy example asset to mobile, you can use adb command:adb push examples/runtime /sdcard/Android/data/<package name>/files/bgfx/examples/runtime, in this project, run this:
adb push examples/runtime /sdcard/Android/data/com.example.native_activity_bgfx/files/bgfx/examples/runtime
Run app:
