create simple skia app for android using jni

platform_tools/android/examples/hello_skia_app/jni/Android.mk

+LOCAL_PATH := $(call my-dir)
+
+##
+# Sets up a module for the skia shared object to be copied into the apk.
+##
+
+include $(CLEAR_VARS)
+
+# Name for referencing this module in other modules
+LOCAL_MODULE := skia_android
+
+# Local filename of the skia shared object
+LOCAL_SRC_FILES := skia/libskia_android.so
+
+# Makes this module into shared object that is simply copied into the apk
+include $(PREBUILT_SHARED_LIBRARY)
+
+
+##
+# Sets up the JNI module that our app calls into to draw things with skia.
+##
+
+include $(CLEAR_VARS) # clear out the variables of the previous module
+
+# Name of the module that the app will reference with System.loadLibrary
+LOCAL_MODULE := hello_skia_ndk
+
+# List of the source files compiled for this module
+LOCAL_SRC_FILES := helloskia.cpp
+
+# Makes the skia shared object get pulled in as a reference
+LOCAL_SHARED_LIBRARIES := skia_android
+
+# jnigraphics defines the function AndroidBitmap_lockPixels, which we need in order to draw into
+# android.graphics.Bitmap
+LOCAL_LDLIBS := -ljnigraphics
+
+# Allows the compiler to find the Skia header files
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/skia/include/config \
+                    $(LOCAL_PATH)/skia/include/core
+
+include $(BUILD_SHARED_LIBRARY)