Android WebView详解

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MainActivity.java
package com.example.web;import android.app.Activity;import android.app.ProgressDialog;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.view.KeyEvent;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.webkit.WebChromeClient;import android.webkit.WebSettings;import android.webkit.WebView;import android.webkit.WebViewClient;import android.widget.Button;public class MainActivity extends Activity implements OnClickListener {    private WebView webView;    private ProgressDialog dialog;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Button intentButton = (Button) findViewById(R.id.intent);        Button webviewButton = (Button) findViewById(R.id.webviewButton);        init();        intentButton.setOnClickListener(this);        webviewButton.setOnClickListener(this);    }    @Override    public void onClick(View v) {        switch (v.getId()) {        // 使用内置系统浏览器打开网页        case R.id.intent:            Intent intent = new Intent(Intent.ACTION_VIEW);            Uri uri = Uri.parse("http://www.baidu.com");            intent.setData(uri);            // Intent intent =new Intent(Intent.ACTION_VIEW,uri)            startActivity(intent);            break;        case R.id.webviewButton:            // webview默认使用系统浏览器打开网页,setWebViewClient让网页在webview中打开            webView.loadUrl("http://www.baidu.com");            break;        default:            break;        }    }    private void init() {        webView = (WebView) findViewById(R.id.webView);        // WebView加载本地资源        // webView.loadUrl("file:///android_asset/example.html");        webView.getSettings().setJavaScriptEnabled(true);        webView.setScrollBarStyle(0);        webView.getSettings().setAllowFileAccess(true);        webView.getSettings().setBuiltInZoomControls(true);        // WebView加载页面优先使用缓存加载        webView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);        // 覆盖WebView默认通过第三方或者是系统浏览器打开网页的行为，使得网页可以在WebView中打开        webView.setWebViewClient(new WebViewClient() {            @Override            public boolean shouldOverrideUrlLoading(WebView view, String url) {                // WebViewClient帮助WebView去处理一些页面控制和请求通知                // 返回值是true的时候控制网页在WebView中去打开，如果为false调用系统浏览器或第三方浏览器去打开                view.loadUrl(url);                return true;            }        });        //打开网页时添加进度条        webView.setWebChromeClient(new WebChromeClient() {            @Override            public void onProgressChanged(WebView view, int newProgress) {                // newProgress 1-100之间的整数                if (newProgress == 100) {                    // 网页加载完毕，关闭ProgressDialog                    closeDialog();                } else {                    // 网页正在加载,打开ProgressDialog                    openDialog(newProgress);                }            }            private void closeDialog() {                            if (dialog != null && dialog.isShowing()) {                    dialog.dismiss();                    dialog = null;                }            }            private void openDialog(int newProgress) {                if (dialog == null) {                    dialog = new ProgressDialog(MainActivity.this);                    dialog.setTitle("正在加载");                    dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);                    dialog.setProgress(newProgress);                    dialog.show();                } else {                    dialog.setProgress(newProgress);                }            }        });    }    // 改写物理按键——返回的逻辑    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {                if (keyCode == KeyEvent.KEYCODE_BACK) {            // Toast.makeText(this, webView.getUrl(),            // Toast.LENGTH_SHORT).show();            if (webView.canGoBack()) {                webView.goBack();// 返回上一页面                return true;            } else {                System.exit(0);// 退出程序            }        }        return super.onKeyDown(keyCode, event);    }}
参考文章：
http://www.cnblogs.com/mengdd/archive/2013/03/01/2938295.html
视频：
http://www.imooc.com/video/2269
本文出自 “点滴积累” 博客，请务必保留此出处http://tianxingzhe.blog.51cto.com/3390077/1706609
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