android/Environment: pass JNIEnv to all functions

src/Main.cxx

@@ -591,12 +591,12 @@ MainConfigured(const CommandLineOptions &options,
 #ifdef ANDROID
 
 static void
-AndroidMain()
+AndroidMain(JNIEnv *env)
 {
 	CommandLineOptions options;
 	ConfigData raw_config;
 
-	const auto sdcard = Environment::getExternalStorageDirectory();
+	const auto sdcard = Environment::getExternalStorageDirectory(env);
 	if (!sdcard.IsNull()) {
 		const auto config_path =
 			sdcard / Path::FromFS("mpd.conf");
@@ -625,7 +625,7 @@ Java_org_musicpd_Bridge_run(JNIEnv *env, jclass, jobject _context, jobject _logL
 	AtScopeExit() { delete logListener; };
 
 	try {
-		AndroidMain();
+		AndroidMain(env);
 	} catch (...) {
 		LogError(std::current_exception());
 	}

src/android/Environment.cxx

@@ -51,10 +51,8 @@ Deinitialise(JNIEnv *env) noexcept
 }
 
 AllocatedPath
-getExternalStorageDirectory() noexcept
+getExternalStorageDirectory(JNIEnv *env) noexcept
 {
-	JNIEnv *env = Java::GetEnv();
-
 	jobject file =
 		env->CallStaticObjectMethod(cls,
 					    getExternalStorageDirectory_method);
@@ -65,14 +63,12 @@ getExternalStorageDirectory() noexcept
 }
 
 AllocatedPath
-getExternalStoragePublicDirectory(const char *type) noexcept
+getExternalStoragePublicDirectory(JNIEnv *env, const char *type) noexcept
 {
 	if (getExternalStoragePublicDirectory_method == nullptr)
 		/* needs API level 8 */
 		return nullptr;
 
-	JNIEnv *env = Java::GetEnv();
-
 	Java::String type2(env, type);
 	jobject file = env->CallStaticObjectMethod(cls,
 						   getExternalStoragePublicDirectory_method,

src/android/Environment.hxx

@@ -36,10 +36,10 @@ Deinitialise(JNIEnv *env) noexcept;
  */
 [[gnu::pure]]
 AllocatedPath
-getExternalStorageDirectory() noexcept;
+getExternalStorageDirectory(JNIEnv *env) noexcept;
 
 [[gnu::pure]]
 AllocatedPath
-getExternalStoragePublicDirectory(const char *type) noexcept;
+getExternalStoragePublicDirectory(JNIEnv *env, const char *type) noexcept;
 
 } // namespace Environment

src/fs/StandardDirectory.cxx

@@ -254,7 +254,8 @@ GetUserMusicDir() noexcept
 #elif defined(USE_XDG)
 	return GetUserDir("XDG_MUSIC_DIR");
 #elif defined(ANDROID)
-	return Environment::getExternalStoragePublicDirectory("Music");
+	return Environment::getExternalStoragePublicDirectory(Java::GetEnv(),
+							      "Music");
 #else
 	return nullptr;
 #endif