Add 'asset' URLConnection; IOUtil uses URLConnection / incr. effeciency; Android ClassLoaderUtil cleanup;

- Add 'asset' URLConnection
  - Please read API doc 'PiggybackURLConnection' and 'AssetURLConnection'

  - Solves generic resource handling where platform locations may differ,
    ie ClassLoader lookup on Android in the 'assets/' subfolder.

  - New Android 'AssetDexClassLoader' uses 'assets/' folder for findResource(..)

  - aapt.signed (our APK ant task)
    - uses 'assets/' folder

    - adds the 'assetsdir' attribute allowing to copy other assets into the APK

- IOUtil uses URLConnection / incr. effeciency
  - using URLConnection on all getResource(..) since URL
    is connected anyways for validation and URLConnection can be used by caller right away

  - String getRelativeOf(URL, String) -> URL getRelativeOf(URL, String)
    - preserves scheme, authority, etc
    - simple parentOf handling, more efficient

  - reusing new 'asset' protocol impl.

- Android ClassLoaderUtil cleanup;
  - Use createClassLoader(..) impl for build-in static jogamp and user APKs,
    which removes code redundancy

Tests: New code path, especially 'assets' are covered by new unit tests, no regressions on Linux.

1 files changed, 11 insertions, 3 deletions

diff --git a/src/java/jogamp/common/os/android/StaticContext.java b/src/java/jogamp/common/os/android/StaticContext.java
index 56f8f13..cb55e65 100644
--- a/src/java/jogamp/common/os/android/StaticContext.java
+++ b/src/java/jogamp/common/os/android/StaticContext.java
@@ -32,13 +32,21 @@ import android.util.Log;
 
 public class StaticContext {
    private static Context context = null;
+   
    private static boolean DEBUG = false;
    
-   public static final synchronized void setContext(Context ctx) {
-       if(DEBUG) Log.d(MD.TAG, "setContext("+ctx+")");
+   public static final synchronized void init(Context ctx) {
+       if(null != context) {
+           throw new RuntimeException("Context already set");
+       }
+       if(DEBUG) { Log.d(MD.TAG, "init("+ctx+")"); }
        context = ctx;
    }
+   public static final synchronized void clear() {
+       if(DEBUG) { Log.d(MD.TAG, "clear()"); }
+       context = null;       
+   }
    public static final synchronized Context getContext() {
        return context;
-   }
+   }   
 }