Android2.2.3 實現多點縮放功能

Android2.2.3 實現多點縮放功能：

1. // 觸摸事件
2. @Override
3. public boolean onTouchEvent(MotionEvent event) {
4. if (false == this.is_initialized()) {
5. return false;
6. }
8. try {
9. PointF point_s = new PointF();
10. point_s.x = event.getX();
11. point_s.y = event.getY();
12. int x = (int) point_s.x;// Float.to( event.getX() );
13. int y = (int) point_s.y;// Float.floatToIntBits( event.getY() );
15. switch (event.getAction() & MotionEvent.ACTION_MASK) {
16. case MotionEvent.ACTION_DOWN:
17. m_pressPt.set(x, y);
18. mode = DRAG;
19. break;
20. case MotionEvent.ACTION_UP:
22. if (mode == DRAG) {
23. int px = x - m_pressPt.x;
24. int py = y - m_pressPt.y;
26. if (px != 0 && py != 0) {
27. m_naviEngine.SetCenter(480 - px, 270 - py);
28. }
29. }
32. mode = NONE;
34. break;
36. case MotionEvent.ACTION_POINTER_UP:
37. if (mode == ZOOM) {
38. float newDist = spacing(event);
39. if (newDist > 10f) {
40. float scale = newDist - oldDist;
41. if (scale > 0) {
42. m_levelIndex = getLevelIndex();
43. // 設置當前比例尺
44. if (m_levelIndex < m_level.length - 1) {
45. m_levelIndex++;
46. m_naviEngine.SetLevel(m_level[m_levelIndex]);
47. m_btnZoomOut.setEnabled(true);
48. if (m_levelIndex == m_level.length - 1) {
49. m_btnZoomIn.setEnabled(false);
50. }
52. // 更新信息彈出框
53. // showPopSign();
55. }
56. } else {
57. m_levelIndex = getLevelIndex();
58. // 設置當前比例尺以及按鈕狀態
59. if (m_levelIndex > 0) {
60. m_levelIndex--;
61. m_naviEngine.SetLevel(m_level[m_levelIndex]);
62. m_btnZoomIn.setEnabled(true);
63. if (m_levelIndex == 0) {
64. m_btnZoomOut.setEnabled(false);
65. }
67. // 更新信息彈出框
68. // showPopSign();
69. }
70. }
71. }
72. }
73. break;
74. case MotionEvent.ACTION_POINTER_DOWN:
75. oldDist = spacing(event);
76. if (oldDist > 10f) {
78. mode = ZOOM;
80. }
81. break;
82. }
83. } catch (UnsatisfiedLinkError e) {
84. return false;
85. }
87. return m_gestureScanner.onTouchEvent(event);
88. }