这招对我很管用:

android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:maxWidth="39dip"
android:scaleType="centerCrop"
android:adjustViewBounds ="true"

当以编程方式执行此操作时，请确保以正确的顺序调用setter:

imageView.setAdjustViewBounds(true)
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP)

以编程方式应用宽高比到Imageview:

aspectRatio = imageWidth/imageHeight   
ratioOfWidth = imageWidth/maxWidth  
ratioOfHeight = imageHeight/maxHeight  


if(ratioOfWidth > ratioOfHeight){​​​​​​​
    imageWidth = maxWidth 
    imageHeight = imageWidth/aspectRatio
}​​​​​​​ else if(ratioOfHeight > ratioOfWidth){​​​​​​​
    imageHeight = maxHeight
    imageWidth = imageHeight * aspectRatio
}​​​​​​​

之后，您可以使用缩放位图图像视图

Bitmap scaledBitmap= Bitmap.createScaledBitmap(bitmap, (int) imageWidth , (int) imageHeight , true);

如果你想让你的图像占据尽可能大的空间，那么最好的选择是

android:layout_weight="1"
android:scaleType="fitCenter"

你可以计算屏幕宽度。你可以缩放位图。

 public static float getScreenWidth(Activity activity) {
        Display display = activity.getWindowManager().getDefaultDisplay();
        DisplayMetrics outMetrics = new DisplayMetrics();
        display.getMetrics(outMetrics);
        float pxWidth = outMetrics.widthPixels;
        return pxWidth;
    }

计算屏幕宽度和按屏幕宽度缩放的图像高度。

float screenWidth=getScreenWidth(act)
  float newHeight = screenWidth;
  if (bitmap.getWidth() != 0 && bitmap.getHeight() != 0) {
     newHeight = (screenWidth * bitmap.getHeight()) / bitmap.getWidth();
  }

之后就可以缩放位图了。

Bitmap scaledBitmap=Bitmap.createScaledBitmap(bitmap, (int) screenWidth, (int) newHeight, true);

传递你的ImageView，根据屏幕的高度和宽度，你可以做出它

    public void setScaleImage(EventAssetValueListenerView view){
        // Get the ImageView and its bitmap
        Drawable drawing = view.getDrawable();
        Bitmap bitmap = ((BitmapDrawable)drawing).getBitmap();
        // Get current dimensions
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();

        float xScale = ((float) 4) / width;
        float yScale = ((float) 4) / height;
        float scale = (xScale <= yScale) ? xScale : yScale;

        Matrix matrix = new Matrix();
        matrix.postScale(scale, scale);

        Bitmap scaledBitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
        BitmapDrawable result = new BitmapDrawable(scaledBitmap);
        width = scaledBitmap.getWidth();
        height = scaledBitmap.getHeight();

        view.setImageDrawable(result);

        LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) view.getLayoutParams();
        params.width = width;
        params.height = height;
        view.setLayoutParams(params);
    }