Summary of trivial knowledge points in Android programming (3)

1. image loading method to help users load images

Java code

1. /***
2. * Load local Images
3. *
4. * @ Param Context
5. *: Main running function instance
6. * @ Param bitadress
7. *: Image address, which generally points to the drawable directory under R.
8. * @ Return
9. */
10. Public final bitmap creatimage (context, int bitadress ){
11. Bitmap bitmaptemp = NULL;
12. Bitmaptemp = bitmapfactory. decoderesource (context. getresources (),
13. Bitadress );
14. Return bitmaptemp;
15. }

2. The image mean segmentation method divides a larger image into N rows and n columns on average for ease of use

Java code

1. /***
2. * Image Segmentation
3. *
4. * @ Param g
5. *: Canvas
6. * @ Param paint
7. *: Paint brush
8. * @ Param imgbit
9. *: Image
10. * @ Param x
11. *: X-axis start Coordinate
12. * @ Param y
13. *: Y-axis start Coordinate
14. * @ Param W
15. *: Width of a single image
16. * @ Param H
17. *: Height of a single image
18. * @ Param line
19. *: Column number
20. * @ Param row
21. *: Row number
22. */
23. Public final void cuteimage (canvas g, paint, bitmap imgbit, int X,
24. Int y, int W, int H, int line, int row ){
25. G. cliprect (X, Y, x + W, H + y );
26. G. drawbitmap (imgbit, X-line * w, Y-row * H, paint );
27. G. Restore ();
28. }

3. resize the current image

Java code

1. /***
2. * Image Scaling Method
3. *
4. * @ Param bgimage
5. *: Source image resources
6. * @ Param newwidth
7. *: Width after scaling
8. * @ Param newheight
9. *: Zoom height
10. * @ Return
11. */
12. Public bitmap zoomimage (Bitmap bgimage, int newwidth, int newheight ){
13. // Obtain the width and height of the image.
14. Int width = bgimage. getwidth ();
15. Int Height = bgimage. getheight ();
16. // Create a matrix object for image operations
17. Matrix matrix = new matrix ();
18. // Calculate the zooming rate. The new size excludes the original size.
19. Float scalewidth = (float) newwidth)/width;
20. Float scaleheight = (float) newheight)/height;
21. // Scaling the image
22. Matrix. postscale (scalewidth, scaleheight );
23. Bitmap bitmap = bitmap. createbitmap (bgimage, 0, 0, width, height,
24. Matrix, true );
25. Return bitmap;
26. }

4. Draw text with borders, which is generally used to beautify the text in the game

Java code

1. /***
2. * Draw text with borders
3. *
4. * @ Param strmsg
5. *: Draw content
6. * @ Param g
7. *: Canvas
8. * @ Param paint
9. *: Paint brush
10. * @ Param setx
11. *: Start coordinate of the X axis
12. * @ Param sety
13. *: Start coordinate of the Y axis
14. * @ Param FG
15. *: Foreground color
16. * @ Param BG
17. *: Background Color
18. */
19. Public void drawtext (string strmsg, canvas g, paint, int setx,
20. Int sety, int FG, int BG ){
21. Paint. setcolor (BG );
22. G. drawtext (strmsg, setx + 1, sety, paint );
23. G. drawtext (strmsg, setx, sety-1, paint );
24. G. drawtext (strmsg, setx, sety + 1, paint );
25. G. drawtext (strmsg, setx-1, sety, paint );
26. Paint. setcolor (FG );
27. G. drawtext (strmsg, setx, sety, paint );
28. G. Restore ();
29. }

5. The easiest way to separate images

Java code

1. Public final bitmap cuteimage (Bitmap _ imgbit, int _ startx, int width,
2. Int _ starty, int height ){
3. Bitmap tempmap = NULL;
4. Tempmap = bitmap. createbitmap (_ imgbit, _ startx, _ starty, width, height );
5. Return tempmap;
6. }

6. String branch display

Java code

1. Public String [] stringformat (string text, int maxwidth, int fontsize ){
2. String [] result = NULL;
3. Vector <string> tempr = new vector <string> ();
4. Int lines = 0;
5. Int Len = text. Length ();
6. Int index0 = 0;
7. Int index1 = 0;
8. Boolean wrap;
9. While (true ){
10. Int widthes = 0;
11. Wrap = false;
12. For (index0 = index1; index1 <Len; index1 ++ ){
13. If (text. charat (index1) = '\ n '){
14. Index1 ++;
15. Wrap = true;
16. Break;
17. }
18. Widthes = fontsize + widthes;
19. If (widthes> maxwidth ){
20. Break;
21. }
22. }
23. Lines ++;
24. If (WRAP ){
25. Tempr. addelement (text. substring (index0, index1-1 ));
26. } Else {
27. Tempr. addelement (text. substring (index0, index1 ));
28. }
29. If (index1> = Len ){
30. Break;
31. }
32. }
33. Result = new string [Lines];
34. Tempr. copyinto (result );
35. Return result;
36. }