Android WebView详解（加快加载篇）

当我们在使用WebView时，如果加载的网友比较大，这加载速度将非常慢。

1. package?com.robin; ?
2. ?
3. ?
4. import?com.robin.R; ?
5. import?android.app.Activity; ?
6. import?android.app.Dialog; ?
7. import?android.app.ProgressDialog; ?
8. import?android.content.Context; ?
9. import?android.content.DialogInterface; ?
10. import?android.os.Bundle; ?
11. import?android.os.Handler; ?
12. import?android.os.Message; ?
13. import?android.util.Log; ?
14. import?android.view.View; ?
15. import?android.view.Window; ?
16. import?android.webkit.DownloadListener; ?
17. import?android.webkit.WebChromeClient; ?
18. import?android.webkit.WebSettings; ?
19. import?android.webkit.WebSettings.RenderPriority; ?
20. import?android.webkit.WebView; ?
21. import?android.widget.Button; ?
22. import?android.widget.Toast; ?
23. ?
24. ?
25. /** ?
26. ?*?@author?Administrator ?
27. ?*? ?
28. ?*/?
29. public?class?MyActivity?extends?Activity?{ ?
30. private?WebView?webView; ?
31. final?static?String?TAG?=?"MyActivity"; ?
32. Handler?handler?=?new?Handler(); ?
33. boolean?blockLoadingNetworkImage=false; ?
34. //static?long?t=0; ?
35. //static?long?t1=0; ?
36. String?link; ?
37. protected?void?onCreate(Bundle?savedInstanceState)?{ ?
38. super.onCreate(savedInstanceState); ?
39. link?=?getIntent().getStringExtra("url"); ?
40. setContentView(R.layout.news_details); ?
41. ?
42. ?
43. webView?=?(WebView)?findViewById(R.id.webView); ?
44. webView.getSettings().setBuiltInZoomControls(true); ?
45. webView.getSettings().setJavaScriptEnabled(true); ?
46. webView.getSettings().setRenderPriority(RenderPriority.HIGH); ?
47. webView.getSettings().setBlockNetworkImage(true); ?
48. blockLoadingNetworkImage=true; ?
49. webView.setWebChromeClient(new?WebChromeClient()?{ ?
50. public?void?onProgressChanged(WebView?view,?int?progress)?{ ?
51. //?Activities?and?WebViews?measure?progress?with?different ?
52. //?scales. ?
53. //?The?progress?meter?will?automatically?disappear?when?we?reach ?
54. //?100% ?
55. //Log.i(TAG,?"progress:"?+?progress); ?
56. if(loadingProgressDialog!=null&&loadingProgressDialog.isShowing()) ?
57. loadingProgressDialog.setProgress(progress); ?
58. if?(progress?>=?100)?{ ?
59. /*if(t==0) ?
60. t=System.currentTimeMillis()-t1; ?
61. else ?
62. t=(t+System.currentTimeMillis()-t1)>>1; ?
63. t1=System.currentTimeMillis()-t1; ?
64. Log.i(TAG,?"t:"?+?t/1000+"?t1:"+t1/1000);*/?
65. if(blockLoadingNetworkImage) ?
66. { ?
67. webView.getSettings().setBlockNetworkImage(false); ?
68. blockLoadingNetworkImage=false; ?
69. } ?
70. if?(loadingProgressDialog!=null&&loadingProgressDialog.isShowing()) ?
71. dismissDialog(PROGRESS_DIALOG_CONNECTING); ?
72. } ?
73. } ?
74. }); ?
75. Runnable?r?=?new?Runnable()?{ ?
76. public?void?run()?{ ?
77. webView.loadUrl(link); ?
78. //t1=System.currentTimeMillis(); ?
79. Log.i(TAG,?"url:"?+?link); ?
80. showDialog(PROGRESS_DIALOG_CONNECTING); ?
81. } ?
82. }; ?
83. handler.postDelayed(r,?200); ?
84. ?
85. ?
86. } ?
87. ?
88. ?
89. protected?void?onResume()?{ ?
90. super.onResume(); ?
91. if?(webView.getProgress()?<?100) ?
92. showDialog(PROGRESS_DIALOG_CONNECTING); ?
93. } ?
94. ?
95. ?
96. protected?void?onDestroy()?{ ?
97. webView.stopLoading(); ?
98. webView.destroy(); ?
99. super.onDestroy(); ?
100. } ?
101. ?
102. ?
103. final?static?int?PROGRESS_DIALOG_CONNECTING?=?1000; ?
104. ProgressDialog?loadingProgressDialog?=?null; ?
105. ?
106. ?
107. @Override?
108. protected?Dialog?onCreateDialog(int?id)?{ ?
109. switch?(id)?{ ?
110. case?PROGRESS_DIALOG_CONNECTING:?{ ?
111. ProgressDialog?progressDialog?=?new?ProgressDialog(this); ?
112. progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); ?
113. progressDialog.setMessage(getResources() ?
114. .getString(R.string.loading)); ?
115. loadingProgressDialog?=?progressDialog; ?
116. return?progressDialog; ?
117. } ?
118. default: ?
119. break; ?
120. } ?
121. return?null; ?
122. } ?
123. ?
124. ?
125. protected?void?onPrepareDialog(int?id,?Dialog?dialog)?{ ?
126. super.onPrepareDialog(id,?dialog); ?
127. switch?(id)?{ ?
128. case?PROGRESS_DIALOG_CONNECTING:?{ ?
129. loadingProgressDialog.setMax(100); ?
130. dialog.show(); ?
131. } ?
132. break; ?
133. default: ?
134. break; ?
135. } ?
136. } ?
137. ?
138. ?
139. }