WebView简介（加速加载篇）

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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：

package com.robin;

import com.robin.R;

import android.app.Activity;

import android.app.Dialog;

import android.app.ProgressDialog;

import android.content.Context;

import android.content.DialogInterface;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.util.Log;

import android.view.View;

import android.view.Window;

import android.webkit.DownloadListener;

import android.webkit.WebChromeClient;

import android.webkit.WebSettings;

import android.webkit.WebSettings.RenderPriority;

import android.webkit.WebView;

import android.widget.Button;

import android.widget.Toast;

/**

 * @author Administrator

 * 

 */

public class   MyActivity   extends  Activity {

private WebView webView;

final static String TAG = "MyActivity";

Handler handler = new Handler();

boolean blockLoadingNetworkImage=false;

//static long t=0;

//static long t1=0;

String link;

protected void onCreate(Bundle savedInstanceState) {

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( new  WebChromeClient () {

public void   onProgressChanged (WebView view, int progress) {

// Activities and WebViews measure progress with different

// scales.

// The progress meter will automatically disappear when we reach

// 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);

}

}

});

Runnable r = new Runnable() {

public void run() {

webView.loadUrl(link);

//t1=System.currentTimeMillis();

Log.i(TAG, "url:" + link);

showDialog(PROGRESS_DIALOG_CONNECTING);

}

};

handler.postDelayed(r, 200);

}

protected void   onResume()  {

super.onResume();

if (webView.getProgress() < 100)

showDialog(PROGRESS_DIALOG_CONNECTING);

}

protected void   onDestroy()  {

webView.stopLoading();

webView.destroy();

super.onDestroy();

}

final static int PROGRESS_DIALOG_CONNECTING = 1000;

ProgressDialog loadingProgressDialog = null;

@Override

protected Dialog   onCreateDialog (int id) {

switch (id) {

case PROGRESS_DIALOG_CONNECTING: {

ProgressDialog progressDialog = new ProgressDialog(this);

progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

progressDialog.setMessage(getResources()

.getString(R.string.loading));

loadingProgressDialog = progressDialog;

return progressDialog;

}

default:

break;

}

return null;

}

protected void  onPrepareDialog (int id, Dialog dialog) {

super.onPrepareDialog(id, dialog);

switch (id) {

case PROGRESS_DIALOG_CONNECTING: {

loadingProgressDialog.setMax(100);

dialog.show();

}

break;

default:

break;

}

}

}

           

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