class GameSurfaceView extends SurfaceView implements SurfaceHolder.Callback, Runnable {
        private GameMgr _gameMgr = new GameMgr();
        private Thread _thread;

        public GameSurfaceView(Context context) {
                super(context);
                getHolder().addCallback(this);
        }

        @Override
        public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
                //解像度情報変更通知 
        }

        @Override
        public void surfaceCreated(SurfaceHolder holder) {
                _thread = new Thread(this);             //別スレッドでメインループを作る
                _thread.start();
        }

        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {
                _thread = null;
        }

        @Override
        public void run() {
                while (_thread!=null) { //メインループ
                        _gameMgr.onUpdate();
                        onDraw(getHolder());
                }
        }

        private void onDraw(SurfaceHolder holder) {
                Canvas c = holder.lockCanvas();
                if(c == null){
                              return;
                }
                _gameMgr.onDraw(c);
                holder.unlockCanvasAndPost(c);
        }
}

public abstract class Task {

        public boolean onUpdate(){
                return true;
        }
        
        public void onDraw(Canvas c){           
        }

}

public class FpsController extends Task {

        private long _startTime = 0;            //測定開始時刻
        private int  _cnt = 0;                  //カウンタ
        private Paint _paint = new Paint();     //paint情報
        private float _fps;                     //fps
        private final static int N = 60;        //平均を取るサンプル数
        private final static int FONT_SIZE = 20;//フォントサイズ
        
        public FpsController(){
                _paint.setColor(Color.BLUE);    //フォントの色を青に設定
                _paint.setTextSize(FONT_SIZE);  //フォントサイズを設定
        }
        
        @Override
        public boolean onUpdate(){
                if( _cnt == 0 ){ //1フレーム目なら時刻を記憶
                        _startTime = System.currentTimeMillis();
                }
                if( _cnt == N ){ //60フレーム目なら平均を計算する
                        long t = System.currentTimeMillis();
                        _fps = 1000.f/((t-_startTime)/(float)N);
                        _cnt = 0;
                        _startTime = t;
                }
                _cnt++;
                return true;
        }

        @Override
        public void onDraw(Canvas c){
                c.drawText(String.format("%.1f", _fps), 0, FONT_SIZE-2, _paint);
        }

}

public class GameMgr {

        private LinkedList<Task> _taskList = new LinkedList<Task>(); //タスクリスト
        
        GameMgr(){
                _taskList.add( new FpsController() );
        }
        
        public boolean onUpdate() {
                for(int i=0; i<_taskList.size(); i++){
                        if(_taskList.get(i).onUpdate() == false){ //更新失敗なら
                                _taskList.remove(i);              //そのタスクを消す
                                i--;
                        }
                }
                return true;
        }

        public void onDraw(Canvas c) {
                c.drawColor(Color.WHITE);       //白で塗りつぶす
                for(int i=0; i<_taskList.size(); i++){
                        _taskList.get(i).onDraw(c);//描画
                }
        }

}