"Go" ImageView attribute android:scaletype, i.e. Imageview.setscaletype (Imageview.scaletype)

1  Here we focus on understanding ImageView's attribute Android:scaletype, namely Imageview.setscaletype (Imageview.scaletype). Android:scaletype is a size that controls how the picture resized/moved to the ImageView. Imageview.scaletype/android:scaletype Value difference: 2   3 Center/center  by the original size of the picture is displayed, when the picture is longer/wider than the length/width of the view, The center portion of the captured picture is displayed 4   5 center_crop/centercrop  proportionally enlarges the size of the image to the center display, making the picture long (wide) equal to or greater than the view's length (width) 6   7 center_inside/ Centerinside the  contents of the picture to the full center display, by proportionally reduced or the original size so that the picture length/width is equal to or less than the length/width of the view 8   9 Fit_center/fitcenter  enlarge the picture proportionally Zoom to the width of the view, centered  on the fit_end/fitend to   enlarge/shrink the image to the width of the view, shown in the lower part of the view  Fit_start/fitstart  enlarges/shrinks the image to the width of the view, displayed in the upper part of the view.  Fit_xy/fitxy The  picture is not scaled up/down to the size of the view display  MATRIX/ Matrix is used to draw

At first I did not understand matrix matrices, the web search found that the original matrix can be scaled to zoom the image to display, here do not expand in-depth understanding, just post related statements, reduce the image:

1//Get bitmap high and wide  2 int bmpwidth=bmp.getwidth ();  3 int bmpheight=bmp.getheight ();  4   5//Set reduction ratio  6 double scale=0.8;  7//Calculate the ratio to be reduced by  8 scalewidth= (float) (Scalewidth*scale);  9 scaleheight= (float) (Scaleheight*scale); 10  

1 <imageview 2 android:id= "@+id/image" 3     android:layout_width= "Fill_parent"  4     Android:layout_height = "Fill_parent" 5     android:scaletype= "Center" 6     

"Go" ImageView attribute android:scaletype, i.e. Imageview.setscaletype (Imageview.scaletype)