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

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