WebView简介（加速加载篇）

妖狐艹你老母 2022-04-17 03:47 330阅读 0赞

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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][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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![这里写图片描述][SouthEast]

[http_blog.csdn.net_jiangjunshow]: https://blog.csdn.net/jiangjunshow/article/details/77338485
[http_developer.android.com_guide_topics_graphics_hardware-accel.html]: http://developer.android.com/guide/topics/graphics/hardware-accel.html
[SouthEast]: /images/20220417/89bc0ed081f84f0ba88e8dc3bf2d6b42.png