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

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);
}