视图类，双缓冲，图片资源的显示

public class TestView extends View implements Runnable {

    Bitmap m_bitQQ;

    Bitmap m_bitCanvas;

    Canvas m_canvas;

Paint m_paint;

 

    public TestView(Context context) {

        super(context);

        m_bitQQ = ((BitmapDrawable)getResources().

getDrawable(R.mipmap.img1)).getBitmap();

        DisplayMetrics dm = new DisplayMetrics();

        WindowManager wm =(WindowManager)context.

getSystemService(Context.WINDOW_SERVICE);

        wm.getDefaultDisplay().getMetrics(dm);

        m_bitCanvas = Bitmap.createBitmap(dm.widthPixels, dm.heightPixels, Bitmap.Config.ARGB_8888);

        m_canvas = new Canvas();

        m_canvas.setBitmap(m_bitCanvas);

        m_paint = new Paint();

        m_canvas.drawBitmap(m_bitQQ, 0, 0, m_paint);

        new Thread(this).start();

}

 

    protected void onDraw(Canvas canvas) {

        super.onDraw(canvas);

        canvas.drawBitmap(m_bitCanvas, 0, 0, m_paint);

}

 

    public void run() {

        while (!Thread.currentThread().isInterrupted())

        {

            try {

                Thread.sleep(100);

            }

            catch (InterruptedException e)

            {

                Thread.currentThread().interrupt();

            }

            postInvalidate();

        }

    }

}