Scaletype attribute of imageview

The property Android: scaletype of imageview, that is, imageview. setscaletype (imageview. scaletype ). Android: scaletype controls how images are resized/moved to match the size of imageview. Imageview. scaletype/Android: The difference between scaletype values: center/center is displayed in the center of the original size of the image. When the length/width of the image exceeds the length/width of the view, then, the center part of the captured image is displayed. center_crop/centercrop scales up the image size in the center to make the image length (width) equal to or greater than the view length (width) center_inside/centerinside displays the image content in the center, scale down the image size proportionally or make the image length/width equal to or less than the view length/width fit_center/fitcenter to scale up/down the image to the view width proportionally, in the center, fit_end/fitend is used to increase or decrease the image width proportionally to the view width. in the lower part of the view, fit_start/fitstart is used to increase or decrease the image width proportionally to the view width, in the top part of the view, fit_xy/fitxy expands or scales down the image proportionally to the view size. The matrix/matrix is used to draw the matrix at the beginning, after searching on the internet, I found that the original matrix can be dynamically zoomed in and enlarged to display the image. Here I am not going to understand it in depth. I just posted the relevant statements to narrow down the image: // obtain the height and width of Bitmap int BMP = BMP. getwidth (); int bmpheight = BMP. getheight (); // set the scale-down ratio to double scale = 0.8; // calculate the scale-down ratio scalewidth = (float) (scalewidth * scale); scaleheight = (float) (scaleheight * scale); // The bitmap object after Resize is generated. Matrix matrix = new matrix (); matrix. postscale (scalewidth, scaleheight); bitmap resizebmp = bitmap. createbitmap (BMP, 0, 0, BMP width, bmpheight, matrix, true );