android/Context: add GetExternalFilesDir()

src/android/Context.cxx

@@ -27,6 +27,25 @@
 #include "AudioManager.hxx"
 
 AllocatedPath
+Context::GetExternalFilesDir(JNIEnv *env, const char *_type) noexcept
+{
+	assert(_type != nullptr);
+
+	Java::Class cls{env, env->GetObjectClass(Get())};
+	jmethodID method = env->GetMethodID(cls, "getExternalFilesDir",
+					    "(Ljava/lang/String;)Ljava/io/File;");
+	assert(method);
+
+	Java::String type{env, _type};
+
+	jobject file = env->CallObjectMethod(Get(), method, type.Get());
+	if (Java::DiscardException(env) || file == nullptr)
+		return nullptr;
+
+	return Java::File::ToAbsolutePath(env, file);
+}
+
+AllocatedPath
 Context::GetCacheDir(JNIEnv *env) const noexcept
 {
 	assert(env != nullptr);

src/android/Context.hxx

@@ -31,6 +31,10 @@ public:
 		:Java::GlobalObject(env, obj) {}
 
 	[[gnu::pure]]
+	AllocatedPath GetExternalFilesDir(JNIEnv *env,
+					  const char *type) noexcept;
+
+	[[gnu::pure]]
 	AllocatedPath GetCacheDir(JNIEnv *env) const noexcept;
 
 	[[gnu::pure]]