Android: Add specialized content provider implementation of DoFileSearch

Source/Android/jni/AndroidCommon/AndroidCommon.cpp

@@ -44,6 +44,14 @@ std::vector<std::string> JStringArrayToVector(JNIEnv* env, jobjectArray array)
   return result;
 }
 
+jobjectArray JStringArrayFromVector(JNIEnv* env, std::vector<std::string> vector)
+{
+  jobjectArray result = env->NewObjectArray(vector.size(), IDCache::GetStringClass(), nullptr);
+  for (jsize i = 0; i < vector.size(); ++i)
+    env->SetObjectArrayElement(result, i, ToJString(env, vector[i]));
+  return result;
+}
+
 bool IsPathAndroidContent(const std::string& uri)
 {
   return StringBeginsWith(uri, "content://");
@@ -130,6 +138,17 @@ std::vector<std::string> GetAndroidContentChildNames(const std::string& uri)
   return JStringArrayToVector(env, reinterpret_cast<jobjectArray>(children));
 }
 
+std::vector<std::string> DoFileSearchAndroidContent(const std::string& directory,
+                                                    const std::vector<std::string>& extensions,
+                                                    bool recursive)
+{
+  JNIEnv* env = IDCache::GetEnvForThread();
+  jobject result = env->CallStaticObjectMethod(
+      IDCache::GetContentHandlerClass(), IDCache::GetContentHandlerDoFileSearch(),
+      ToJString(env, directory), JStringArrayFromVector(env, extensions), recursive);
+  return JStringArrayToVector(env, reinterpret_cast<jobjectArray>(result));
+}
+
 int GetNetworkIpAddress()
 {
   JNIEnv* env = IDCache::GetEnvForThread();

Source/Android/jni/AndroidCommon/AndroidCommon.h

@@ -38,6 +38,10 @@ std::string GetAndroidContentDisplayName(const std::string& uri);
 // Returns the display names of all children of a directory, non-recursively.
 std::vector<std::string> GetAndroidContentChildNames(const std::string& uri);
 
+std::vector<std::string> DoFileSearchAndroidContent(const std::string& directory,
+                                                    const std::vector<std::string>& extensions,
+                                                    bool recursive);
+
 int GetNetworkIpAddress();
 int GetNetworkPrefixLength();
 int GetNetworkGateway();

Source/Android/jni/AndroidCommon/IDCache.cpp

@@ -10,6 +10,8 @@ static constexpr jint JNI_VERSION = JNI_VERSION_1_6;
 
 static JavaVM* s_java_vm;
 
+static jclass s_string_class;
+
 static jclass s_native_library_class;
 static jmethodID s_display_alert_msg;
 static jmethodID s_do_rumble;
@@ -47,6 +49,7 @@ static jmethodID s_content_handler_delete;
 static jmethodID s_content_handler_get_size_and_is_directory;
 static jmethodID s_content_handler_get_display_name;
 static jmethodID s_content_handler_get_child_names;
+static jmethodID s_content_handler_do_file_search;
 
 static jclass s_network_helper_class;
 static jmethodID s_network_helper_get_network_ip_address;
@@ -78,6 +81,11 @@ JNIEnv* GetEnvForThread()
   return owned.env;
 }
 
+jclass GetStringClass()
+{
+  return s_string_class;
+}
+
 jclass GetNativeLibraryClass()
 {
   return s_native_library_class;
@@ -228,6 +236,11 @@ jmethodID GetContentHandlerGetChildNames()
   return s_content_handler_get_child_names;
 }
 
+jmethodID GetContentHandlerDoFileSearch()
+{
+  return s_content_handler_do_file_search;
+}
+
 jclass GetNetworkHelperClass()
 {
   return s_network_helper_class;
@@ -262,6 +275,9 @@ jint JNI_OnLoad(JavaVM* vm, void* reserved)
   if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION) != JNI_OK)
     return JNI_ERR;
 
+  const jclass string_class = env->FindClass("java/lang/String");
+  s_string_class = reinterpret_cast<jclass>(env->NewGlobalRef(string_class));
+
   const jclass native_library_class = env->FindClass("org/dolphinemu/dolphinemu/NativeLibrary");
   s_native_library_class = reinterpret_cast<jclass>(env->NewGlobalRef(native_library_class));
   s_display_alert_msg = env->GetStaticMethodID(s_native_library_class, "displayAlertMsg",
@@ -331,6 +347,9 @@ jint JNI_OnLoad(JavaVM* vm, void* reserved)
       s_content_handler_class, "getDisplayName", "(Ljava/lang/String;)Ljava/lang/String;");
   s_content_handler_get_child_names = env->GetStaticMethodID(
       s_content_handler_class, "getChildNames", "(Ljava/lang/String;Z)[Ljava/lang/String;");
+  s_content_handler_do_file_search =
+      env->GetStaticMethodID(s_content_handler_class, "doFileSearch",
+                             "(Ljava/lang/String;[Ljava/lang/String;Z)[Ljava/lang/String;");
 
   const jclass network_helper_class =
       env->FindClass("org/dolphinemu/dolphinemu/utils/NetworkHelper");

Source/Android/jni/AndroidCommon/IDCache.h

@@ -10,6 +10,8 @@ namespace IDCache
 {
 JNIEnv* GetEnvForThread();
 
+jclass GetStringClass();
+
 jclass GetNativeLibraryClass();
 jmethodID GetDisplayAlertMsg();
 jmethodID GetDoRumble();
@@ -47,6 +49,7 @@ jmethodID GetContentHandlerDelete();
 jmethodID GetContentHandlerGetSizeAndIsDirectory();
 jmethodID GetContentHandlerGetDisplayName();
 jmethodID GetContentHandlerGetChildNames();
+jmethodID GetContentHandlerDoFileSearch();
 
 jclass GetNetworkHelperClass();
 jmethodID GetNetworkHelperGetNetworkIpAddress();