Copy platforms and samples from ndk/ source tree.

The idea is to allow developing the NDK in the open, while
having the platforms and samples under a private branch until
the corresponding release are open-sourced.

Change-Id: Iee995fb6c4d3ee1387dea7486e599e079c9e4c6d

ndk/samples/hello-neon/src/com/example/neon/HelloNeon.java

@@ -0,0 +1,37 @@
+package com.example.neon;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.widget.TextView;
+
+public class HelloNeon extends Activity
+{
+    /** Called when the activity is first created. */
+    @Override
+    public void onCreate(Bundle savedInstanceState)
+    {
+        super.onCreate(savedInstanceState);
+        /* Create a TextView and set its content.
+         * the text is retrieved by calling a native
+         * function.
+         */
+        TextView  tv = new TextView(this);
+        tv.setText( stringFromJNI() );
+        setContentView(tv);
+    }
+
+    /* A native method that is implemented by the
+     * 'helloneon' native library, which is packaged
+     * with this application.
+     */
+    public native String  stringFromJNI();
+
+    /* this is used to load the 'helloneon' library on application
+     * startup. The library has already been unpacked into
+     * /data/data/com.example.neon/lib/libhelloneon.so at
+     * installation time by the package manager.
+     */
+    static {
+        System.loadLibrary("helloneon");
+    }
+}