- add storage folder support to android renderer, thanks @iwgeric

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@9064 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/android/com/jme3/system/android/JmeAndroidSystem.java

@@ -2,6 +2,7 @@ package com.jme3.system.android;
 
 import android.app.Activity;
 import android.content.res.Resources;
+import android.os.Environment;
 import com.jme3.asset.AndroidAssetManager;
 import com.jme3.asset.AssetManager;
 import com.jme3.audio.AudioRenderer;
@@ -13,6 +14,7 @@ import com.jme3.system.JmeSystemDelegate;
 import com.jme3.system.Platform;
 import com.jme3.util.AndroidLogHandler;
 import com.jme3.util.JmeFormatter;
+import java.io.File;
 import java.net.URL;
 import java.util.logging.Handler;
 import java.util.logging.Level;
@@ -86,6 +88,34 @@ public class JmeAndroidSystem extends JmeSystemDelegate{
         }
     }
 
+    @Override
+    public synchronized File getStorageFolder() {
+        //http://developer.android.com/reference/android/content/Context.html#getExternalFilesDir
+        //http://developer.android.com/guide/topics/data/data-storage.html
+
+        boolean mExternalStorageWriteable = false;
+        String state = Environment.getExternalStorageState();
+        if (Environment.MEDIA_MOUNTED.equals(state)) {
+            mExternalStorageWriteable = true;
+        } else {
+            mExternalStorageWriteable = false;
+        }
+
+        if (mExternalStorageWriteable) {
+            //getExternalFilesDir automatically creates the directory if necessary.
+            //directory structure should be: /mnt/sdcard/Android/data/<packagename>/files
+            //when created this way, the directory is automatically removed by the Android
+            //  system when the app is uninstalled
+            storageFolder = activity.getApplicationContext().getExternalFilesDir(null);
+            logger.log(Level.INFO, "Storage Folder Path: {0}", storageFolder.getAbsolutePath());
+
+            return storageFolder;
+        } else {
+            return null;
+        }
+
+    }
+
     public static void setResources(Resources res) {
         JmeAndroidSystem.res = res;
     }