如何在画布中拉伸图像时调整大小？

Question

我在画布上显示了一个图像。下面是代码。当用户在各个方向拖动图像时，有没有办法动态拉伸或缩小图像？怎么接近它？

public class MainActivity extends Activity 
{
     @Override
     public void onCreate(Bundle savedInstanceState)
     {
         super.onCreate(savedInstanceState);
         setContentView(new MyView(this));
     }

     public class MyView extends View
     {
         public MyView(Context context) 
         {
              super(context);
         }

         @Override
         protected void onDraw(Canvas canvas) 
         {
            super.onDraw(canvas);
            Bitmap _scratch =  BitmapFactory.decodeResource(getResources(), R.drawable.dog);
            canvas.drawColor(Color.WHITE);
            canvas.drawBitmap(_scratch, 0, 0, null);
        }
     }
}

Answer 1

就我而言，这也适用于拉伸

http://developer.android.com/training/displaying-bitmaps/load-bitmap.html

或者你可以尝试这种方式

http://developer.sonymobile.com/2011/06/27/how-to-scale-images-for-your-android-application/