Android 跨進程傳遞對像

android 跨進程傳遞對像必須實現Parcelable 「協議」，例如 public class StatusBarIcon 的對象要能夠實現傳遞功能，必須如此寫:

1. /*
   
2. * Copyright (C) 2010 The Android Open Source Project
   
3. *
   
4. * Licensed under the Apache License, Version 2.0 (the "License");
   
5. * you may not use this file except in compliance with the License.
   
6. * You may obtain a copy of the License at
   
7. *
   
8. *
   
9. * Unless required by applicable law or agreed to in writing, software
   
10. * distributed under the License is distributed on an "AS IS" BASIS,
    
11. * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    
12. * See the License for the specific language governing permissions and
    
13. * limitations under the License.
    
14. */
    
15. 
    
16. 
    
17. package com.android.internal.statusbar;
    
18. import android.os.Parcel;
    
19. import android.os.Parcelable;
    
20. 
    
21. /**
    
22. * @hide
    
23. */
    
24. 
    
25. public class StatusBarIcon implements Parcelable {
    
26. public String iconPackage;
    
27. public int iconId;
    
28. public int iconLevel;
    
29. public boolean visible = true;
    
30. public int number;
    
31. private StatusBarIcon() {
    
32. }
    
33. public StatusBarIcon(String iconPackage, int iconId, int iconLevel) {
    
34. this.iconPackage = iconPackage;
    
35. this.iconId = iconId;
    
36. this.iconLevel = iconLevel;
    
37. }
    
38. public StatusBarIcon(String iconPackage, int iconId, int iconLevel, int number) {
    
39. this.iconPackage = iconPackage;
    
40. this.iconId = iconId;
    
41. this.iconLevel = iconLevel;
    
42. this.number = number;
    
43. }
    
44. public String toString() {
    
45. return "StatusBarIcon(pkg=" + this.iconPackage + " id=0x" + Integer.toHexString(this.iconId)
    
46. + " level=" + this.iconLevel + " visible=" + visible+ " num=" + this.number + " )";
    
47. }
    
48. public StatusBarIcon clone() {
    
49. StatusBarIcon that = new StatusBarIcon(this.iconPackage, this.iconId, this.iconLevel);
    
50. that.visible = this.visible;
    
51. that.number = this.number;
    
52. return that;
    
53. }
    
54. 
    
55. 
    
56. /**
    
57. * Unflatten the StatusBarIcon from a parcel.
    
58. */
    
59. public StatusBarIcon(Parcel in) {
    
60. readFromParcel(in);
    
61. }
    
62. public void readFromParcel(Parcel in) {
    
63. this.iconPackage = in.readString();
    
64. this.iconId = in.readInt();
    
65. this.iconLevel = in.readInt();
    
66. this.visible = in.readInt() != 0;
    
67. this.number = in.readInt();
    
68. }
    
69. 
    
70. 
    
71. public void writeToParcel(Parcel out, int flags) {
    
72. out.writeString(this.iconPackage);
    
73. out.writeInt(this.iconId);
    
74. out.writeInt(this.iconLevel);
    
75. out.writeInt(this.visible ? 1 : 0);
    
76. out.writeInt(this.number);
    
77. }
    
78. 
    
79. 
    
80. public int describeContents() {
    
81. return 0;
    
82. }
    
83. /**
    
84. * Parcelable.Creator that instantiates StatusBarIcon objects
    
85. */
    
86. public static final Parcelable.Creator<StatusBarIcon> CREATOR
    
87. = new Parcelable.Creator<StatusBarIcon>(){
    
88. public StatusBarIcon createFromParcel(Parcel parcel)
    
89. {
    
90. return new StatusBarIcon(parcel);
    
91. }
    
92. public StatusBarIcon[] newArray(int size)
    
93. {
    
94. return new StatusBarIcon[size];
    
95. }
    
96. };
    
97. }

複製代碼

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