Automatically adjust the textview font size to adapt to the textview Length

1. Package com. Test. Android. textview;
3. Import Android. content. context;
4. Import Android. Graphics. paint;
5. Import Android. util. attributeset;
6. Import Android. widget. textview;
8. Public class customtextview extends textview {
10. Private Static float default_min_text_size = 10;
11. Private Static float default_max_text_size = 20;
13. // Attributes
14. Private paint testpaint;
15. Private float mintextsize, maxtextsize;
17. Public customtextview (context, attributeset attrs ){
18. Super (context, attrs );
19. Initialise ();
20. }
22. Private void initialise (){
23. Testpaint = new paint ();
24. Testpaint. Set (this. getpaint ());
26. // Max size defaults to the intially specified text size unless it is
27. // Too small
28. Maxtextsize = This. gettextsize ();
30. If (maxtextsize <= default_min_text_size ){
31. Maxtextsize = default_max_text_size;
32. }
34. Mintextsize = default_min_text_size;
35. };
37. /**
38. * Re size the font so the specified text fits in the text box * Assuming
39. * The text box is the specified width.
40. */
41. Private void refittext (string text, int textwidth ){
42. If (textwidth> 0 ){
43. Int availablewidth = textwidth-This. getpaddingleft ()
44. -This. getpaddingright ();
45. Float trysize = maxtextsize;
46. Testpaint. settextsize (trysize );
47. While (trysize> mintextsize)
48. & (Testpaint. measuretext (text)> availablewidth )){
49. Trysize-= 1;
50. If (trysize <= mintextsize ){
51. Trysize = mintextsize;
52. Break;
53. }
54. Testpaint. settextsize (trysize );
55. }
56. This. settextsize (trysize );
57. }
58. };
60. @ Override
61. Protected void ontextchanged (charsequence text, int start, int before,
62. Int after ){
63. Super. ontextchanged (text, start, before, after );
64. Refittext (text. tostring (), this. getwidth ());
65. }
67. @ Override
68. Protected void onsizechanged (int w, int H, int oldw, int oldh ){
69. If (W! = Oldw ){
70. Refittext (this. gettext (). tostring (), W );
71. }
72. }
73. }