android canvas imageview,怎么把canvas的内容在imageview上显示

我想要把canvas的内容在imageview上显示出来，可是我不是很懂 imageview.draw

(canvas);是做什么的，这是我的代码： public class Matrix extends Activity {

public Bitmap mybitmap,newbmp,bitmap,bmp;

ImageView imageview;

Paint paint;

@Override

public void onCreate(final Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

imageview=(ImageView)findViewById(R.id.ImageView01);

imageview.setDrawingCacheEnabled(true);

}

protected void onDraw(Canvas canvas)

{

imageview.draw(canvas);

mybitmap=BitmapFactory.decodeResource(getResources(),

R.drawable.image);

canvas.drawBitmap(mybitmap, 0, 0, paint);

}

}

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