Android將Widget添加到自己的應用程序

Widget添加方法：長安桌面-彈出Widget列表-選擇之即添加到桌面，下面就實現了一個支持添加到自己應用程序的功能，廢話不多說，直接上代碼。

請看效果圖：

1、通過繼承ViewGroup來實現一個能添加Widget的控件

1. package cn.winplus.w2h;
3. import Android.content.Context;
4. import android.view.MotionEvent;
5. import android.view.View;
6. import android.view.ViewGroup;
8. public class WidgetLayout extends ViewGroup {
10. // 存放touch的坐標
11. private int[] cellInfo = new int[2];
12. private OnLongClickListener mClickListener;
14. public WidgetLayout(Context context) {
15. super(context);
17. mClickListener = new OnLongClickListener() {
19. @Override
20. public boolean onLongClick(View arg0) {
22. return false;
23. }
24. };
26. }
28. public void addInScreen(View child, int width, int height) {
29. LayoutParams lp = new LayoutParams(width, height);
30. lp.x = cellInfo[0];
31. lp.y = cellInfo[1];
32. child.setOnLongClickListener(mClickListener);
33. addView(child, lp);
34. }
36. @Override
37. protected void onLayout(boolean arg0, int arg1, int arg2, int arg3, int arg4) {
38. LayoutParams lParams;
39. for (int i = 0; i < getChildCount(); i++) {
40. lParams = (LayoutParams) getChildAt(i).getLayoutParams();
41. getChildAt(i).layout(lParams.x, lParams.y,
42. lParams.x + lParams.width, lParams.y + lParams.height);
43. }
44. }
46. @Override
47. protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
48. super.onMeasure(widthMeasureSpec, heightMeasureSpec);
50. LayoutParams lParams;
51. for (int i = 0; i < getChildCount(); i++) {
52. lParams = (LayoutParams) getChildAt(i).getLayoutParams();
53. getChildAt(i).measure(
54. MeasureSpec.makeMeasureSpec(MeasureSpec.EXACTLY,lParams.width),
55. MeasureSpec.makeMeasureSpec(MeasureSpec.EXACTLY,lParams.height));
56. }
57. }
59. @Override
60. public boolean dispatchTouchEvent(MotionEvent ev) {
61. cellInfo[0] = (int) ev.getX();
62. cellInfo[1] = (int) ev.getY();
63. return super.dispatchTouchEvent(ev);
64. }
66. private class LayoutParams extends ViewGroup.LayoutParams {
68. int x;
69. int y;
71. public LayoutParams(int arg0, int arg1) {
72. super(arg0, arg1);
73. }
75. }
77. }