Android_UI_中常用的兩種ProgressDialog

而要異步,我們也要在界面上反饋一個信息給用戶,讓用戶知道應該等待數據下載....

先看兩張圖,這就是最常用的異步彈出窗口了

免費下載地址在 http://linux.linuxidc.com/

用戶名與密碼都是www.linuxidc.com

具體下載目錄在 /pub/Android源碼集錦/2011年/12月/Android_UI_中常用的兩種ProgressDialog/

上代碼吧 都比較簡單,關於線程,看了比較多的建議...不管是線程也好還是其他什麼都好,android是一個手機客戶端,

大家在寫代碼的同時還是非常有必要針對內存優化,代碼健壯做一些相應上的代碼優化的.

比如 少用new的關鍵字,對象多復用..等等.我再這裡就不敘述了,我個人也不是非常的強悍

1. package tree.love.UI.Demo.ProgressDialog.activity;
2. import tree.love.UI.Demo.ProgressDialog.R;
3. import android.app.Activity;
4. import android.app.ProgressDialog;
5. import android.os.Bundle;
6. import android.os.Handler;
7. import android.os.Message;
8. import android.view.View;
9. import android.view.View.OnClickListener;
10. public class HomeActivity extends Activity implements OnClickListener
11. {
12. private ProgressDialog loadingDialog = null;
13. /** 第一種風格 **/
14. private static final int LOADING_STYLE_01 = 1 ;
15. /** 第二種風格 **/
16. private static final int LOADING_STYLE_02 = 2 ;
17. @Override
18. protected void onCreate(Bundle savedInstanceState)
19. {
20. super.onCreate(savedInstanceState);
21. setContentView(R.layout.main);
22. findViewById(R.id.button).setOnClickListener(this);
23. findViewById(R.id.button1).setOnClickListener(this);
24. }
25. @Override
26. public void onClick(View v)
27. {
28. switch (v.getId())
29. {
30. case R.id.button://按鈕1
31. loadingDialog = PrintAlertUtil.showDialog(this, "正在下載...");
32. Thread thread01 = new Thread(new Runnable() {
34. @Override
35. public void run()
36. {
37. downLoad(5,false);
38. }
39. });
40. thread01.start();
41. break;
42. case R.id.button1://按鈕2
43. loadingDialog = PrintAlertUtil.showDialog(this, "正在更新", 100);
44. Thread thread02 = new Thread(new Runnable() {
46. @Override
47. public void run()
48. {
49. downLoad(10,true);
50. }
51. });
52. thread02.start();
53. break;
54. }
55. }
56. private Handler mHandler = new Handler() {
57. @Override
58. public void handleMessage(Message msg)
59. {
60. super.handleMessage(msg);
61. switch (msg.what)
62. {
63. case LOADING_STYLE_01:
64. //關閉對話框
65. PrintAlertUtil.dismissDialog(loadingDialog);
66. //提示
67. PrintAlertUtil.showToast(HomeActivity.this, msg.obj.toString());
68. break;
70. case LOADING_STYLE_02:
71. int p = msg.getData().getInt("percent");
72. if (p == 100)
73. {
74. //更新完成,關閉對話框
75. loadingDialog.setProgress(p);
76. PrintAlertUtil.dismissDialog(loadingDialog);
77. PrintAlertUtil.showToast(HomeActivity.this, msg.obj.toString());
78. }
79. else
80. {
81. //更新進度條
82. loadingDialog.setProgress(p);
83. }
84. break;
85. }
86. }
87. };
88. /**
89. * 模擬下載操作
90. */
91. public void downLoad(int number,boolean download)
92. {
93. for (int i = 0; i < number; i++)
94. {
95. /** 每次模擬停頓耗時0.5秒 **/
96. try{Thread.sleep(500);}catch (InterruptedException e){e.printStackTrace();}
97. if (download)
98. {
99. /** 每循環一次更新一次進度 **/
100. int percent = (i+1)*10;
101. Message message = new Message();
102. Bundle bundle = message.getData();
103. bundle.putInt("percent", percent);
104. message.setData(bundle);
105. message.what = LOADING_STYLE_02;
106. if (i == 9)
107. {
108. message.obj="更新完畢";
109. }
110. mHandler.sendMessage(message);
111. }
112. }
113. if (!download)
114. {
115. Message message = new Message();
116. message.what = LOADING_STYLE_01;
117. message.obj = "下載完成";
118. mHandler.sendMessage(message);
119. }
120. }
121. }