如何设置ImageView高度为宽度的50％

ImageView android:id="@+id/imageView" android:layout_width="wrap_content" android:layout_height="match_parent" android:scaleType="fitXY" android:adjustViewBounds="true" android:background="@color/transparent" tools:src="@drawable/test"

    
    重点参考这两行：
    android:scaleType="fitXY"
android:adjustViewBounds="true"
    

尝试执行以下操作

int img_width = cover_img.getDrawable().getIntrinsicWidth();
        int img_height = img_width/2;
        cover_img.getLayoutParams().width = img_width;
        cover_img.getLayoutParams().height = img_height;
        cover_img.requestLayout();