create simple skia app for android using jni

platform_tools/android/examples/hello_skia_app/src/com/example/HelloSkiaActivity.java

Index: platform_tools/android/examples/hello_skia_app/src/com/example/HelloSkiaActivity.java
diff --git a/platform_tools/android/examples/hello_skia_app/src/com/example/HelloSkiaActivity.java b/platform_tools/android/examples/hello_skia_app/src/com/example/HelloSkiaActivity.java
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index 0000000000000000000000000000000000000000..53daeaf756ecb5eaa32ed01a7f53f32019a56153
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+++ b/platform_tools/android/examples/hello_skia_app/src/com/example/HelloSkiaActivity.java
@@ -0,0 +1,74 @@
+package com.example;
+
+import java.util.Timer;
+import java.util.TimerTask;
+
+import android.app.Activity;
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.os.Bundle;
+import android.os.SystemClock;
+import android.util.Log;
+import android.view.View;
+
+public class HelloSkiaActivity extends Activity
+{
+    private SkiaDrawView fMainView;
+
+    /** Called when the activity is first created. */
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        // Makes and sets a SkiaDrawView as the only thing seen in this activity
+        fMainView = new SkiaDrawView(this);
+        setContentView(fMainView);
+
+        try {
+            // Load Skia and then the app shared object in this order
+            System.loadLibrary("skia_android");
+            System.loadLibrary("hello_skia_ndk");
+
+        } catch (UnsatisfiedLinkError e) {
+            Log.d("HelloSkia", "Link Error: " + e);
+            return;
+        }
+
+        // Set a timer that will periodically request an update of the SkiaDrawView
+        Timer fAnimationTimer = new Timer();
+        fAnimationTimer.schedule(new TimerTask() {
+            public void run()
+            {
+                // This will request an update of the SkiaDrawView, even from other threads
+                fMainView.postInvalidate();
+            }
+        }, 0, 5); // 0 means no delay before the timer starts; 5 means repeat every 5 milliseconds
+    }
+
+    private class SkiaDrawView extends View {
+        Bitmap fSkiaBitmap;
+        public SkiaDrawView(Context ctx) {
+            super(ctx);
+        }
+
+        @Override
+        protected void onSizeChanged(int w, int h, int oldw, int oldh)
+        {
+            // Create a bitmap for skia to draw into
+            fSkiaBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
+        }
+
+        @Override
+        protected void onDraw(Canvas canvas) {
+            // Call into our C++ code that renders to the bitmap using Skia
+            drawIntoBitmap(fSkiaBitmap, SystemClock.elapsedRealtime());
+
+            // Present the bitmap on the screen
+            canvas.drawBitmap(fSkiaBitmap, 0, 0, null);
+        }
+    }
+
+
+    private native void drawIntoBitmap(Bitmap image, long elapsedTime);
+}