在一个Activity中使用多个Dialog

Android Dev-Guide 推荐重写Activity.onCreateDialog()方法来创建Dialog，这样Dialog就归属于这个Activity了。使用方法是这样的，Activity.showDialog()激发Activity.onCreateDialog()创建Dialog，然后显示之，便于多个Dialog的统一管理。注意，以后再用Activity.showDialog()显示同一个Dialog时，则不会调用Activity.onCreateDialog()，而是调用Activity.onPrepareDialog()，使用上一次显示Dialog时的状态。即
第一次：showDialog() -> onCreatedialog()
以后： showDialog() -> onPrepareDialog()

在示例代码中，分别用createExitDialog()，createListDialog()，createRadioDialog()，createCheckboxDialog()，创建4种Dialog，并在Activity中显示。示例代码如下：

Java代码

1. packagecom.ipjmc.dialog;
3. importandroid.app.Activity;
4. importandroid.app.AlertDialog;
5. importandroid.app.Dialog;
6. importandroid.content.DialogInterface;
7. importandroid.os.Bundle;
8. importandroid.util.Log;
9. importandroid.widget.Toast;
11. publicclassShowDialogActivityextendsActivity{
12. /**Calledwhentheactivityisfirstcreated.*/
13. publicstaticfinalStringTAG="ShowDialog";
14. publicstaticfinalintID_EXIT_DIALOG=1;
15. publicstaticfinalintID_LIST_DIALOG=2;
16. publicstaticfinalintID_RADIO_DIALOG=3;
17. publicstaticfinalintID_CHECKBOX_DIALOG=4;
19. @Override
20. publicvoidonCreate(BundlesavedInstanceState){
21. super.onCreate(savedInstanceState);
22. setContentView(R.layout.main);
24. showDialog(ID_EXIT_DIALOG);
25. showDialog(ID_LIST_DIALOG);
26. showDialog(ID_RADIO_DIALOG);
27. showDialog(ID_CHECKBOX_DIALOG);
28. }
30. @Override
31. protectedDialogonCreateDialog(intid){
32. //TODOAuto-generatedmethodstub
33. Dialogdialog=null;
34. switch(id){
35. caseID_EXIT_DIALOG:
36. dialog=createExitDialog();
37. break;
38. caseID_LIST_DIALOG:
39. dialog=createListDialog();
40. break;
41. caseID_RADIO_DIALOG:
42. dialog=createRadioDialog();
43. break;
44. caseID_CHECKBOX_DIALOG:
45. dialog=createCheckboxDialog();
46. break;
47. default:
48. break;
49. }
50. if(dialog!=null){
51. Log.i(TAG,dialog.toString());
52. }else{
53. Log.i(TAG,"dialog=null");
54. }
55. returndialog;
56. }
58. @Override
59. protectedvoidonPrepareDialog(intid,Dialogdialog){
60. //TODOAuto-generatedmethodstub
61. super.onPrepareDialog(id,dialog);
62. }
64. //创建简单Dialog
65. publicDialogcreateExitDialog(){
66. AlertDialog.Builderbuilder=newAlertDialog.Builder(this);
67. builder.setMessage("Areyousureyouwanttoexit?")
68. .setCancelable(false)
69. .setPositiveButton("Yes",newDialogInterface.OnClickListener(){
70. publicvoidonClick(DialogInterfacedialog,intid){
71. ShowDialogActivity.this.finish();
72. }
73. })
74. .setNegativeButton("No",newDialogInterface.OnClickListener(){
75. publicvoidonClick(DialogInterfacedialog,intid){
76. dialog.cancel();
77. }
78. });
79. returnbuilder.create();
80. }
82. //创建ListDialog
83. publicDialogcreateListDialog(){
84. finalCharSequence[]items={"Red","Green","Blue"};
86. AlertDialog.Builderbuilder=newAlertDialog.Builder(this);
87. builder.setTitle("Pickacolor");
88. builder.setItems(items,newDialogInterface.OnClickListener(){
89. publicvoidonClick(DialogInterfacedialog,intitem){
90. Toast.makeText(getApplicationContext(),items[item],Toast.LENGTH_SHORT).show();
91. }
92. });
93. returnbuilder.create();
94. }
96. //创建单选Dialog
97. publicDialogcreateRadioDialog(){
98. finalCharSequence[]items={"Red","Green","Blue"};
100. AlertDialog.Builderbuilder=newAlertDialog.Builder(this);
101. builder.setTitle("Pickacolor");
102. builder.setSingleChoiceItems(items,-1,newDialogInterface.OnClickListener(){
103. publicvoidonClick(DialogInterfacedialog,intposition){
104. Toast.makeText(getApplicationContext(),position+"->"+items[position],Toast.LENGTH_SHORT).show();
105. dialog.dismiss();
106. }
107. });
108. returnbuilder.create();
109. }
111. //创建多选Dialog
112. publicDialogcreateCheckboxDialog(){
113. finalCharSequence[]items={"Red","Green","Blue"};
114. finalboolean[]checked=newboolean[]{false,false,false};
116. AlertDialog.Builderbuilder=newAlertDialog.Builder(this);
117. builder.setTitle("Pickacolor");
118. builder.setMultiChoiceItems(items,checked,newDialogInterface.OnMultiChoiceClickListener(){
120. @Override
121. publicvoidonClick(DialogInterfacedialog,intwhich,booleanisChecked){
122. //TODOAuto-generatedmethodstub
124. }
125. });
127. builder.setPositiveButton("确定",newDialogInterface.OnClickListener(){
128. publicvoidonClick(DialogInterfacedialog,intid){
129. ShowDialogActivity.this.finish();
130. }
131. })
132. .setNegativeButton("取消",newDialogInterface.OnClickListener(){
133. publicvoidonClick(DialogInterfacedialog,intid){
134. dialog.cancel();
135. }
136. });
138. returnbuilder.create();
140. }
141. }