armory3d.armortools/base/sources/backends/android_file_dialog.c

#include "android_file_dialog.h"
#include "android_native_app_glue.h"
#include <iron_system.h>
#include <jni.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>

extern char android_title[1024];

ANativeActivity *iron_android_get_activity(void);
jclass           iron_android_find_class(JNIEnv *env, const char *name);

JNIEXPORT void JNICALL Java_org_armory3d_IronActivity_onAndroidFilePicked(JNIEnv *env, jobject jobj, jstring jstr) {
	if (jstr == NULL)
		return;
	const char *str = (*env)->GetStringUTFChars(env, jstr, 0);
	iron_internal_drop_files_callback(str);
	(*env)->ReleaseStringUTFChars(env, jstr, str);
}

JNIEXPORT jstring JNICALL Java_org_armory3d_IronActivity_getMobileTitle(JNIEnv *env, jobject jobj) {
	jstring result = (*env)->NewStringUTF(env, android_title);
	return result;
}

void AndroidFileDialogOpen() {
	ANativeActivity *activity = iron_android_get_activity();
	JNIEnv          *env;
	JavaVM          *vm = iron_android_get_activity()->vm;
	(*vm)->AttachCurrentThread(vm, &env, NULL);
	jclass ironActivityClass = iron_android_find_class(env, "org.armory3d.IronActivity");
	(*env)->CallStaticVoidMethod(env, ironActivityClass, (*env)->GetStaticMethodID(env, ironActivityClass, "pickFile", "()V"));
	(*vm)->DetachCurrentThread(vm);
}

wchar_t *AndroidFileDialogSave() {
	// iron_android_get_activity()->externalDataPath; // /storage/emulated/0/Android/data/org.armorpaint/files
	mkdir("/storage/emulated/0/Pictures/ArmorPaint", 0777);
	return L"/storage/emulated/0/Pictures/ArmorPaint/untitled";
}

jstring android_permission_name(JNIEnv *env, const char *perm_name) {
	jclass   ClassManifestpermission = (*env)->FindClass(env, "android/Manifest$permission");
	jfieldID lid_PERM                = (*env)->GetStaticFieldID(env, ClassManifestpermission, perm_name, "Ljava/lang/String;");
	jstring  ls_PERM                 = (jstring)((*env)->GetStaticObjectField(env, ClassManifestpermission, lid_PERM));
	return ls_PERM;
}

bool android_has_permission(struct android_app *app, const char *perm_name) {
	ANativeActivity *activity = iron_android_get_activity();
	JNIEnv          *env;
	JavaVM          *vm = iron_android_get_activity()->vm;
	(*vm)->AttachCurrentThread(vm, &env, NULL);
	bool    result             = false;
	jstring ls_PERM            = android_permission_name(env, perm_name);
	jint    PERMISSION_GRANTED = (jint)(-1);
	{
		jclass   ClassPackageManager    = (*env)->FindClass(env, "android/content/pm/PackageManager");
		jfieldID lid_PERMISSION_GRANTED = (*env)->GetStaticFieldID(env, ClassPackageManager, "PERMISSION_GRANTED", "I");
		PERMISSION_GRANTED              = (*env)->GetStaticIntField(env, ClassPackageManager, lid_PERMISSION_GRANTED);
	}
	{
		jobject   activity                  = app->activity->clazz;
		jclass    ClassContext              = (*env)->FindClass(env, "android/content/Context");
		jmethodID MethodcheckSelfPermission = (*env)->GetMethodID(env, ClassContext, "checkSelfPermission", "(Ljava/lang/String;)I");
		jint      int_result                = (*env)->CallIntMethod(env, activity, MethodcheckSelfPermission, ls_PERM);
		result                              = (int_result == PERMISSION_GRANTED);
	}
	(*vm)->DetachCurrentThread(vm);
	return result;
}

void android_request_file_permissions(struct android_app *app) {
	ANativeActivity *activity = iron_android_get_activity();
	JNIEnv          *env;
	JavaVM          *vm = iron_android_get_activity()->vm;
	(*vm)->AttachCurrentThread(vm, &env, NULL);
	jobjectArray perm_array = (*env)->NewObjectArray(env, 1, (*env)->FindClass(env, "java/lang/String"), (*env)->NewStringUTF(env, ""));
	(*env)->SetObjectArrayElement(env, perm_array, 0, android_permission_name(env, "READ_MEDIA_IMAGES")); // MANAGE_EXTERNAL_STORAGE
	jobject   jactivity                = app->activity->clazz;
	jclass    ClassActivity            = (*env)->FindClass(env, "android/app/Activity");
	jmethodID MethodrequestPermissions = (*env)->GetMethodID(env, ClassActivity, "requestPermissions", "([Ljava/lang/String;I)V");
	(*env)->CallVoidMethod(env, jactivity, MethodrequestPermissions, perm_array, 0);
	(*vm)->DetachCurrentThread(vm);
}

void android_check_permissions() {
	ANativeActivity    *activity       = iron_android_get_activity();
	struct android_app *app            = (struct android_app *)activity->instance;
	bool                hasPermissions = android_has_permission(app, "READ_MEDIA_IMAGES"); // MANAGE_EXTERNAL_STORAGE
	if (!hasPermissions)
		android_request_file_permissions(app);

	JNIEnv *env;
	JavaVM *vm = iron_android_get_activity()->vm;
	(*vm)->AttachCurrentThread(vm, &env, NULL);
	jclass          ironActivityClass = iron_android_find_class(env, "org.armory3d.IronActivity");
	JNINativeMethod methodTable[]     = {{"onAndroidFilePicked", "(Ljava/lang/String;)V", (void *)Java_org_armory3d_IronActivity_onAndroidFilePicked},
	                                     {"getMobileTitle", "()Ljava/lang/String;", (void *)Java_org_armory3d_IronActivity_getMobileTitle}};
	int             methodTableSize   = sizeof(methodTable) / sizeof(methodTable[0]);
	(*env)->RegisterNatives(env, ironActivityClass, methodTable, methodTableSize);
	(*vm)->DetachCurrentThread(vm);
}