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我正在创建我的第一个动态壁纸，其中雪将在随机位置产生并开始动画。但它滞后。这是我的代码。

代码中没有错误，但它滞后。如果我增加雪的数量，它会滞后更多。如何解决滞后？

public class CybWallpaper extends WallpaperService {

    @Override
    public Engine onCreateEngine() {
        return new Mywall();
    }
    public class Mywall extends Engine
    {
        int x[]=new int[30],y[]=new int[30];
        int isr=0;
        int scw,sch;
        Canvas dra;
        int temps[]=new int[30];
        boolean isft=true;


        Handler hand=new Handler();
        boolean isrun;
        Random ran=new Random();
        Runnable iterate=new Runnable()
        {
            @Override
            public void run() {
                slower();
                drawframe();
            }

        };



        @Override
        public void onSurfaceCreated(SurfaceHolder holder) {
            // TODO Auto-generated method stub
            super.onSurfaceCreated(holder);


        }

        @Override
        public void onSurfaceChanged(SurfaceHolder holder, int format,
                int width, int height) {
            // TODO Auto-generated method stub
            super.onSurfaceChanged(holder, format, width, height);
            slower();
            drawframe();
        }

        protected void drawframe() {
            // TODO Auto-generated method stub
            SurfaceHolder sh=getSurfaceHolder();


               dra = null;
               try {
                  dra = sh.lockCanvas();
                  if (dra != null) {

                        for(int i=0;i<30&&isft;i++)
                        {
                            x[i]=ran.nextInt(dra.getWidth());
                            y[i]=ran.nextInt(dra.getHeight());
                            temps[i]=30+ran.nextInt(100);

                        }
                        isft=false;
                        dra.drawARGB(255, 0,0, 0);
                        drawsnow(dra,30);

                  }
               } finally {
                  if (dra != null)
                     sh.unlockCanvasAndPost(dra);
               }
        }

        private void drawsnow(Canvas dra,int n) {
            // TODO Auto-generated method stub
            Bitmap snow=BitmapFactory.decodeResource(getResources(), R.drawable.snow80);
            Bitmap te[]=new Bitmap[30];


            for(int i=0;i<n;i++)
            {
                te[i]=Bitmap.createScaledBitmap(snow, temps[i], temps[i], false);
                dra.drawBitmap(te[i], x[i]-(te[i].getWidth()/2), y[i]-(te[i].getHeight()/2), null);
                //Snow to and fro
                if(isr==0&&x[i]!=140)
                    x[i]+=1;
                else
                    isr=1;

                if(isr==1&&x[i]!=120)
                    x[i]-=1;
                else
                    isr=0;

                if(y[i]<dra.getHeight())
                    y[i]+=6;
                else
                {
                    y[i]=0;
                    x[i]=ran.nextInt(dra.getWidth());
                    temps[i]=30+ran.nextInt(100);
                }
            }

            //Toast.makeText(getApplicationContext(), Float.toString(cx), Toast.LENGTH_SHORT).show();               

        }

        protected void slower() {
            // TODO Auto-generated method stub
            hand.removeCallbacks(iterate);
             if (isrun) {
                hand.postDelayed(iterate, 1000/30);
             }

        }

        @Override
        public void onSurfaceDestroyed(SurfaceHolder holder) {
            // TODO Auto-generated method stub
            super.onSurfaceDestroyed(holder);
            isrun=false;
            hand.removeCallbacks(iterate);
            Toast.makeText(getApplicationContext(), "Destroyed", Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onTouchEvent(MotionEvent event) {
            // TODO Auto-generated method stub
            super.onTouchEvent(event);
        }

        @Override
        public void onVisibilityChanged(boolean visible) {
            // TODO Auto-generated method stub
            super.onVisibilityChanged(visible);
            isrun=visible;
            if(isrun)
            {
                slower();
                drawframe();
            }
            else
            {
                hand.removeCallbacks(iterate);
            }
            //Toast.makeText(getApplicationContext(), "Visi", Toast.LENGTH_SHORT).show();
        }

    }

}

我编码正确吗？

4

2 回答 2

3 
            Bitmap snow=BitmapFactory.decodeResource(getResources(), R.drawable.snow80);
            Bitmap te[]=new Bitmap[30];

我认为你在这里做错了什么。您的代码不断 decodeResource ==> 浪费大量内存和 CPU ==> 使您的程序变慢，而不是这样做，您应该声明一个全局“雪”变量。

于 2012-12-13T15:15:34.067 回答
1

您的滞后在于解码资源。

Bitmap snow=BitmapFactory.decodeResource(getResources(), R.drawable.snow80);
Bitmap te[]=new Bitmap[30];

我会将其移至onSurfaceCreated函数并使用成员对象。

于 2012-12-13T15:16:54.157 回答