java - 缩小并绘制位图时长宽比关闭

Question

我使用的图像来自 4x6。所以长宽比应该约为0.66。当我在代码中计算长宽比时，得到的值约为 0.66。然而，显示图像的高度看起来被压扁了。仅当我手动将纵横比设置为 0.85 左右时，图像才看起来正确。

由于手动设置宽高比并不完美，我怎样才能保持图像的高度不被挤压。

public class SpotGameActivity extends Activity {

private Bitmap mBitmap;

/** Called when the activity is first created. */


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    mBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.dpi2b);
    setContentView(new BitMapView(this, mBitmap));

}

    class BitMapView extends View {
        Bitmap mBitmap = null;

        public BitMapView(Context context, Bitmap bm) {
            super(context);
            mBitmap = bm;
        }

        @Override
        protected void onDraw(Canvas canvas) {
            // called when view is drawn
            Paint paint = new Paint();
            paint.setFilterBitmap(true);
            // The image will be scaled so it will fill the width, and the
            // height will preserve the image’s aspect ration
            float aspectRatio = ((float) mBitmap.getWidth()) / mBitmap.getHeight();
            Rect dest = new Rect(0, 0, this.getWidth(),(int) (this.getHeight() * aspectRatio));

            String AR = Double.toString(aspectRatio);

            //Rect dest = new Rect(0, 0, getWidth(), getHeight());

            canvas.drawBitmap(mBitmap, null, dest, paint);
            Toast.makeText(SpotGameActivity.this, AR, Toast.LENGTH_SHORT).show();   
        }
    }

}

Answer 1

长宽比=宽度/高度

新高度=新宽度/宽高比

这样做，

Rect dest = new Rect(0, 0, this.getWidth(),(int) (this.getWidth() / aspectRatio));