downgrade Android SDK to use old permission mode because on demand request require Java code

android/build.gradle

@@ -3,19 +3,20 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.0'
+        classpath 'com.android.tools.build:gradle:2.3.1'
+        compile 'it.sephiroth.android.exif:library:1.0.1'
     }
 }
 apply plugin: 'android'
 
 android {
-    compileSdkVersion 23
+    compileSdkVersion 19
     buildToolsVersion '23.0.2'
 
     defaultConfig {
         applicationId = 'com.omigamedev'
         minSdkVersion   9
-        targetSdkVersion  23
+        targetSdkVersion  19
         // This block is different from the one you use to link Gradle
         // to your CMake or ndk-build script.
         externalNativeBuild {

android/src/main/cpp/main.cpp

@@ -313,7 +313,7 @@ static int engine_init_display(struct engine* engine) {
     glDisable(GL_DEPTH_TEST);
     //glEnableClientState(GL_VERTEX_ARRAY);
     Asset::m_am = engine->app->activity->assetManager;
-    App::I.data_path = engine->app->activity->externalDataPath;
+    App::I.data_path = "/sdcard/PanoPainter";// engine->app->activity->externalDataPath;
     App::I.width = w;
     App::I.height = h;
     App::I.init();