cleaned code, added pinch gesture detector, better opengl context handling, fixed issues

Change-Id: I26a28374ae74391204586b4584d03cf0c58772c2

ndk/sources/android/helper/JNIHelper.h

@@ -0,0 +1,80 @@
+/*
+ * Copyright 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <jni.h>
+#include <errno.h>
+#include <vector>
+#include <map>
+#include <fstream>
+#include <iostream>
+#include <string>
+
+#include <EGL/egl.h>
+#include <GLES2/gl2.h>
+
+#include <android/sensor.h>
+#include <android/log.h>
+#include <android_native_app_glue.h>
+
+#define LOGI(...) ((void)__android_log_print(ANDROID_LOG_INFO, JNIHelper::getAppName(), __VA_ARGS__))
+#define LOGW(...) ((void)__android_log_print(ANDROID_LOG_WARN, JNIHelper::getAppName(), __VA_ARGS__))
+#define LOGE(...) ((void)__android_log_print(ANDROID_LOG_ERROR, JNIHelper::getAppName(), __VA_ARGS__))
+
+jclass retrieveClass(JNIEnv *jni, ANativeActivity* activity, const char* className);
+
+/******************************************************************
+ * Helpers to invoke Java methods
+ * To use this class, add NDKHelper.java as a corresponding helpers in Java side
+ */
+class JNIHelper
+{
+private:
+    static ANativeActivity* _activity;
+    static jobject _objJNIHelper;
+    static jclass _clsJNIHelper;
+
+    static jstring getExternalFilesDir( JNIEnv *env );
+
+    static std::string _appName;
+public:
+    JNIHelper()
+    {
+    };
+    ~JNIHelper() {
+        JNIEnv *env;
+        _activity->vm->AttachCurrentThread(&env, NULL);
+
+        env->DeleteGlobalRef(_objJNIHelper);
+        env->DeleteGlobalRef(_clsJNIHelper);
+
+        _activity->vm->DetachCurrentThread();
+
+    };
+    static void init( ANativeActivity* activity );
+    static bool readFile( const char* fileName, std::vector<uint8_t>& buffer );
+    static uint32_t loadTexture(const char* fileName );
+    static std::string convertString( const char* str, const char* encode );
+
+    static const char* getAppName() {
+        return _appName.c_str();
+    };
+
+
+
+
+};