Android bitmap zoomin/zoomout/rotate -- zoom in, zoom in, and rotate an image

Java code

1. Public void oncreate (bundle icicle ){
2. Super. oncreate (icicle );
3. Linearlayout linlayout = new linearlayout (this );
5. // Load the image to be operated. Here is the logo image of eoeandroid.
6. Bitmap bitmaporg = bitmapfactory. decoderesource (getresources (),
7. R. drawable. Icon );
9. // Obtain the width and height of the image.
10. Int width = bitmaporg. getwidth ();
11. Int Height = bitmaporg. getheight ();
13. // Define the width and height of the pre-converted Image
14. Int newwidth = 200;
15. Int newheight = 200;
17. // Calculate the zooming rate. The new size excludes the original size.
18. Float scalewidth = (float) newwidth)/width;
19. Float scaleheight = (float) newheight)/height;
21. // Create a matrix object for image operations
22. Matrix matrix = new matrix ();
24. // Scaling the image
25. Matrix. postscale (scalewidth, scaleheight );
27. // Rotate the image
28. Matrix. postrotate (45 );
30. // Create a new image
31. Bitmap resizedbitmap = bitmap. createbitmap (bitmaporg, 0, 0, width,
32. Height, matrix, true );
34. // Convert the bitmap created above to a drawable object so that it can be used in imageview and imagebutton.
35. Bitmapdrawable BMI = new bitmapdrawable (resizedbitmap );
37. // Create an imageview
38. Imageview = new imageview (this );
40. // Set the image of imageview to the image converted above
41. Imageview. setimagedrawable (BMI );
43. // Center the image
44. Imageview. setscaletype (scaletype. center );
46. // Add the imageview to the layout Template
47. Linlayout. addview (imageview, new linearlayout. layoutparams (
48. Layoutparams. fill_parent, layoutparams. fill_parent ));
50. // Set this activity Template
51. Setcontentview (linlayout );
52. }