Android WebView详解（加快加载篇）

Android WebView详解（加速加载篇）

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。

现总结几种加速WebView加载的方法1、提高渲染的优先级webView.getSettings().setRenderPriority(RenderPriority.HIGH);2、使用webView.getSettings().setBlockNetworkImage，把图片加载放在最后来加载渲染。参照示例1.3,使用硬件加速，该功能在Android 3.0 (API level 11)才加入。具体参照：http://developer.android.com/guide/topics/graphics/hardware-accel.html示例1：?

1. package?com.robin; ??
2. ?import?com.robin.R; ?
3. import?android.app.Activity; ?import?android.app.Dialog; ?
4. import?android.app.ProgressDialog; ?import?android.content.Context; ?
5. import?android.content.DialogInterface; ?import?android.os.Bundle; ?
6. import?android.os.Handler; ?import?android.os.Message; ?
7. import?android.util.Log; ?import?android.view.View; ?
8. import?android.view.Window; ?import?android.webkit.DownloadListener; ?
9. import?android.webkit.WebChromeClient; ?import?android.webkit.WebSettings; ?
10. import?android.webkit.WebSettings.RenderPriority; ?import?android.webkit.WebView; ?
11. import?android.widget.Button; ?import?android.widget.Toast; ?
12. ??
13. /** ??*?@author?Administrator ?
14. ?*? ??*/?
15. public?class?MyActivity?extends?Activity?{ ?private?WebView?webView; ?
16. final?static?String?TAG?=?"MyActivity"; ?Handler?handler?=?new?Handler(); ?
17. boolean?blockLoadingNetworkImage=false; ?//static?long?t=0; ?
18. //static?long?t1=0; ?String?link; ?
19. protected?void?onCreate(Bundle?savedInstanceState)?{ ?super.onCreate(savedInstanceState); ?
20. link?=?getIntent().getStringExtra("url"); ?setContentView(R.layout.news_details); ?
21. ??
22. webView?=?(WebView)?findViewById(R.id.webView); ?webView.getSettings().setBuiltInZoomControls(true); ?
23. webView.getSettings().setJavaScriptEnabled(true); ?webView.getSettings().setRenderPriority(RenderPriority.HIGH); ?
24. webView.getSettings().setBlockNetworkImage(true); ?blockLoadingNetworkImage=true; ?
25. webView.setWebChromeClient(new?WebChromeClient()?{ ?public?void?onProgressChanged(WebView?view,?int?progress)?{ ?
26. //?Activities?and?WebViews?measure?progress?with?different ?//?scales. ?
27. //?The?progress?meter?will?automatically?disappear?when?we?reach ?//?100% ?
28. //Log.i(TAG,?"progress:"?+?progress); ?if(loadingProgressDialog!=null&&loadingProgressDialog.isShowing()) ?
29. loadingProgressDialog.setProgress(progress); ?if?(progress?>=?100)?{ ?
30. /*if(t==0) ?t=System.currentTimeMillis()-t1; ?
31. else ?t=(t+System.currentTimeMillis()-t1)>>1; ?
32. t1=System.currentTimeMillis()-t1; ?Log.i(TAG,?"t:"?+?t/1000+"?t1:"+t1/1000);*/?
33. if(blockLoadingNetworkImage) ?{ ?
34. webView.getSettings().setBlockNetworkImage(false); ?blockLoadingNetworkImage=false; ?
35. } ?if?(loadingProgressDialog!=null&&loadingProgressDialog.isShowing()) ?
36. dismissDialog(PROGRESS_DIALOG_CONNECTING); ?} ?
37. } ?}); ?
38. Runnable?r?=?new?Runnable()?{ ?public?void?run()?{ ?
39. webView.loadUrl(link); ?//t1=System.currentTimeMillis(); ?
40. Log.i(TAG,?"url:"?+?link); ?showDialog(PROGRESS_DIALOG_CONNECTING); ?
41. } ?}; ?
42. handler.postDelayed(r,?200); ??
43. ?} ?
44. ??
45. protected?void?onResume()?{ ?super.onResume(); ?
46. if?(webView.getProgress()?<?100) ?showDialog(PROGRESS_DIALOG_CONNECTING); ?
47. } ??
48. ?protected?void?onDestroy()?{ ?
49. webView.stopLoading(); ?webView.destroy(); ?
50. super.onDestroy(); ?} ?
51. ??
52. final?static?int?PROGRESS_DIALOG_CONNECTING?=?1000; ?ProgressDialog?loadingProgressDialog?=?null; ?
53. ??
54. @Override?protected?Dialog?onCreateDialog(int?id)?{ ?
55. switch?(id)?{ ?case?PROGRESS_DIALOG_CONNECTING:?{ ?
56. ProgressDialog?progressDialog?=?new?ProgressDialog(this); ?progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); ?
57. progressDialog.setMessage(getResources() ?.getString(R.string.loading)); ?
58. loadingProgressDialog?=?progressDialog; ?return?progressDialog; ?
59. } ?default: ?
60. break; ?} ?
61. return?null; ?} ?
62. ??
63. protected?void?onPrepareDialog(int?id,?Dialog?dialog)?{ ?super.onPrepareDialog(id,?dialog); ?
64. switch?(id)?{ ?case?PROGRESS_DIALOG_CONNECTING:?{ ?
65. loadingProgressDialog.setMax(100); ?dialog.show(); ?
66. } ?break; ?
67. default: ?break; ?
68. } ?} ?
69. ??
70. }
    

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