android: add LogListener

A Java object to send logs on the android side.

src/android/LogListener.hxx

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2003-2018 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_ANDROID_LOG_LISTENER_HXX
+#define MPD_ANDROID_LOG_LISTENER_HXX
+
+#include "java/Object.hxx"
+
+class LogListener : public Java::Object {
+public:
+	LogListener(JNIEnv *env, jobject obj):Java::Object(env, obj) {}
+
+	void OnLog(JNIEnv *env, int priority, const char *fmt, ...) const;
+};
+
+#endif