Android底圖局部加載移動

1. public class MapMgr {
2. public static MapMgr mapMgr = null;
3. private int map_num = 28;
4. private int b_x = 0;
5. private int b_y = 0;
6. private int width = 0;
7. private int height = 0;
8. private Bitmap bmpView = null;
9. //create by danielinbiti，前提，你圖片確實比屏幕大，如果不比屏幕大，下面注釋行修改一下即可。
10. public static void init(int width,int height){
11. if(mapMgr==null){
12. mapMgr = new MapMgr(width,height);
13. }
14. }
15. public static MapMgr getInstance(){
16. return mapMgr;
17. }
18. public MapMgr(int width,int height){
19. this.width = width;
20. this.height = height;
21. Bitmap bmp = PicMgr.getInstance().getBackGroundBitmap();
22. b_x = (bmp.getWidth()-width)/2;//保證圖片比屏幕大
23. b_y = (bmp.getHeight()-height)/2;
24. bmpView = Bitmap.createBitmap(bmp, b_x, b_y, width, height);
25. }
26. public void logic(){
28. }
29. public void mapDown(){
30. Bitmap bmp = PicMgr.getInstance().getBackGroundBitmap();
31. if(b_y+height<bmp.getHeight()){
32. b_y = b_y + bmp.getHeight()/map_num;
33. if(b_y+height>bmp.getHeight()){
34. b_y = bmp.getHeight() - height;
35. }
36. }
37. bmpView = Bitmap.createBitmap(bmp, b_x, b_y, width, height);
38. }
39. public void mapUp(){
40. Bitmap bmp = PicMgr.getInstance().getBackGroundBitmap();
41. if(b_y>0){
42. b_y = b_y - bmp.getHeight()/map_num;
43. if(b_y<0){
44. b_y = 0;
45. }
46. }
47. bmpView = Bitmap.createBitmap(bmp, b_x, b_y, width, height);
48. }
49. public void mapLeft(){
50. Bitmap bmp = PicMgr.getInstance().getBackGroundBitmap();
51. if(b_x>0){
52. b_x = b_x - bmp.getWidth()/map_num;
53. if(b_x<0){
54. b_x = 0;
55. }
56. }
57. bmpView = Bitmap.createBitmap(bmp, b_x, b_y, width, height);
58. }
59. public void mapRight(){
60. Bitmap bmp = PicMgr.getInstance().getBackGroundBitmap();
61. if(b_x+width<bmp.getWidth()){
62. b_x = b_x + bmp.getWidth()/map_num;
63. if(b_x+width>bmp.getWidth()){
64. b_x = bmp.getHeight() - width;
65. }
66. }
67. bmpView = Bitmap.createBitmap(bmp, b_x, b_y, width, height);
68. }
69. public void draw(Canvas canvas){
70. Paint paint = new Paint();
71. if(bmpView!=null){
72. canvas.drawBitmap(bmpView,0, 0, paint);
73. }
74. }
75. }

調用

1. public void onKeyDownDeal(int keyCode){
2. if(keyCode==KeyEvent.KEYCODE_DPAD_UP){
3. MapMgr.getInstance().mapUp();
4. }else if(keyCode==KeyEvent.KEYCODE_DPAD_DOWN){
5. MapMgr.getInstance().mapDown();
6. }else if(keyCode==KeyEvent.KEYCODE_DPAD_LEFT){
7. MapMgr.getInstance().mapLeft();
8. }else if(keyCode==KeyEvent.KEYCODE_DPAD_RIGHT){
9. MapMgr.getInstance().mapRight();
10. }
11. }

對於觸摸移動只是坐標計算方式不同，其它都類似。另外擴充到GIS等，可以根據小圖片粘貼實現局部加載內容。