Android(安卓)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：

packagecom.robin;
importcom.robin.R;
importandroid.app.Activity;
importandroid.app.Dialog;
importandroid.app.ProgressDialog;
importandroid.content.Context;
importandroid.content.DialogInterface;
importandroid.os.Bundle;
importandroid.os.Handler;
importandroid.os.Message;
importandroid.util.Log;
importandroid.view.View;
importandroid.view.Window;
importandroid.webkit.DownloadListener;
importandroid.webkit.WebChromeClient;
importandroid.webkit.WebSettings;
importandroid.webkit.WebSettings.RenderPriority;
importandroid.webkit.WebView;
importandroid.widget.Button;
importandroid.widget.Toast;
/**
*@authorAdministrator
*
*/
publicclassMyActivityextendsActivity{
privateWebViewwebView;
finalstaticStringTAG="MyActivity";
Handlerhandler=newHandler();
booleanblockLoadingNetworkImage=false;
//staticlongt=0;
//staticlongt1=0;
Stringlink;
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
link=getIntent().getStringExtra("url");
setContentView(R.layout.news_details);
webView=(WebView)findViewById(R.id.webView);
webView.getSettings().setBuiltInZoomControls(true);
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setRenderPriority(RenderPriority.HIGH);
webView.getSettings().setBlockNetworkImage(true);
blockLoadingNetworkImage=true;
webView.setWebChromeClient(newWebChromeClient(){
publicvoidonProgressChanged(WebViewview,intprogress){
//ActivitiesandWebViewsmeasureprogresswithdifferent
//scales.
//Theprogressmeterwillautomaticallydisappearwhenwereach
//100%
//Log.i(TAG,"progress:"+progress);
if(loadingProgressDialog!=null&&loadingProgressDialog.isShowing())
loadingProgressDialog.setProgress(progress);
if(progress>=100){
/*if(t==0)
t=System.currentTimeMillis()-t1;
else
t=(t+System.currentTimeMillis()-t1)>>1;
t1=System.currentTimeMillis()-t1;
Log.i(TAG,"t:"+t/1000+"t1:"+t1/1000);*/
if(blockLoadingNetworkImage)
{
webView.getSettings().setBlockNetworkImage(false);
blockLoadingNetworkImage=false;
}
if(loadingProgressDialog!=null&&loadingProgressDialog.isShowing())
dismissDialog(PROGRESS_DIALOG_CONNECTING);
}
}
});
Runnabler=newRunnable(){
publicvoidrun(){
webView.loadUrl(link);
//t1=System.currentTimeMillis();
Log.i(TAG,"url:"+link);
showDialog(PROGRESS_DIALOG_CONNECTING);
}
};
handler.postDelayed(r,200);
}
protectedvoidonResume(){
super.onResume();
if(webView.getProgress()<100)
showDialog(PROGRESS_DIALOG_CONNECTING);
}
protectedvoidonDestroy(){
webView.stopLoading();
webView.destroy();
super.onDestroy();
}
finalstaticintPROGRESS_DIALOG_CONNECTING=1000;
ProgressDialogloadingProgressDialog=null;
@Override
protectedDialogonCreateDialog(intid){
switch(id){
casePROGRESS_DIALOG_CONNECTING:{
ProgressDialogprogressDialog=newProgressDialog(this);
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog.setMessage(getResources()
.getString(R.string.loading));
loadingProgressDialog=progressDialog;
returnprogressDialog;
}
default:
break;
}
returnnull;
}
protectedvoidonPrepareDialog(intid,Dialogdialog){
super.onPrepareDialog(id,dialog);
switch(id){
casePROGRESS_DIALOG_CONNECTING:{
loadingProgressDialog.setMax(100);
dialog.show();
}
break;
default:
break;
}
}
}

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