1、添加权限：AndroidManifest.xml中必须使用许可”android.permission.INTERNET”,否则会出Web page not available错误。
2、在要Activity中生成一个WebView组件：WebView webView = new WebView(this);
3、设置WebView基本信息：
如果访问的页面中有Javascript，则webview必须设置支持Javascript。
webview.getSettings().setJavaScriptEnabled(true);
触摸焦点起作用
requestFocus();
取消滚动条
this.setScrollBarStyle(SCROLLBARS_OUTSIDE_OVERLAY);
4、设置WevView要显示的网页：
互联网用：webView.loadUrl(“http://www.google.com”);
本地文件用：webView.loadUrl(“file:///android_asset/XX.html”); 本地文件存放在：assets文件中
5、如果希望点击链接由自己处理，而不是新开Android的系统browser中响应该链接。
给WebView添加一个事件监听对象（WebViewClient)
并重写其中的一些方法
shouldOverrideUrlLoading：对网页中超链接按钮的响应。
当按下某个连接时WebViewClient会调用这个方法，并传递参数：按下的url
onLoadResource
onPageStart
onPageFinish
onReceiveError
onReceivedHttpAuthRequest
6、如果用webview点链接看了很多页以后，如果不做任何处理，点击系统“Back”键，整个浏览器会调用finish()而结束自身，如果希望浏览的网页回退而不是退出浏览器，需要在当前Activity中处理并消费掉该Back事件。
覆盖Activity类的onKeyDown(int keyCoder,KeyEvent event)方法。
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td class="gutter">
<div class="line number1 index0 alt2">
1
</div>
<div class="line number2 index1 alt1">
2
</div>
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</div>
</td>
<td class="code">
<div class="container">
<div class="line number1 index0 alt2">
`public` `boolean` `onKeyDown(``int` `keyCoder,KeyEvent event){`
</div>
<div class="line number2 index1 alt1">
` ``if``(webView.canGoBack() && keyCoder == KeyEvent.KEYCODE_BACK){`
</div>
<div class="line number3 index2 alt2">
` ``webview.goBack(); ``//goBack()表示返回webView的上一页面`
</div>
<div class="line number4 index3 alt1">
</div>
<div class="line number5 index4 alt2">
` ``return` `true``;`
</div>
<div class="line number6 index5 alt1">
` ``}`
</div>
<div class="line number7 index6 alt2">
` ``return` `false``;`
</div>
<div class="line number8 index7 alt1">
`}`
</div>
</div>
</td>
</tr>
</table>
### Android监听WebView滑动到底部
MainActivity如下:
<div>
<div id="highlighter_5859" class="syntaxhighlighter java">
<div class="toolbar">
[?](http://www.open-open.com/lib/view/open1379383341959.html#)
</div>
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td class="gutter">
<div class="line number1 index0 alt2">
1
</div>
<div class="line number2 index1 alt1">
2
</div>
<div class="line number3 index2 alt2">
3
</div>
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</div>
</td>
<td class="code">
<div class="container">
<div class="line number1 index0 alt2">
`package` `cn.testwebview;`
</div>
<div class="line number2 index1 alt1">
`import` `android.app.Activity;`
</div>
<div class="line number3 index2 alt2">
`import` `android.graphics.Bitmap;`
</div>
<div class="line number4 index3 alt1">
`import` `android.os.Bundle;`
</div>
<div class="line number5 index4 alt2">
`import` `android.webkit.WebSettings;`
</div>
<div class="line number6 index5 alt1">
`import` `android.webkit.WebView;`
</div>
<div class="line number7 index6 alt2">
`import` `android.webkit.WebViewClient;`
</div>
<div class="line number8 index7 alt1">
`import` `cn.testwebview.TestWebView.ScrollInterface;`
</div>
<div class="line number9 index8 alt2">
`/**`
</div>
<div class="line number10 index9 alt1">
` ``* Demo描述:`
</div>
<div class="line number11 index10 alt2">
` ``* 监听WebView滑动到底部`
</div>
<div class="line number12 index11 alt1">
` ``*`
</div>
<div class="line number13 index12 alt2">
` ``* 参考资料:`
</div>
<div class="line number14 index13 alt1">
` ``* 1 http://blog.csdn.net/conant1989/article/details/8124582`
</div>
<div class="line number15 index14 alt2">
` ``* Thank you very much`
</div>
<div class="line number16 index15 alt1">
` ``*/`
</div>
<div class="line number17 index16 alt2">
`public` `class` `MainActivity ``extends` `Activity {`
</div>
<div class="line number18 index17 alt1">
` ``private` `TestWebView mTestWebView;`
</div>
<div class="line number19 index18 alt2">
` ``@Override`
</div>
<div class="line number20 index19 alt1">
` ``protected` `void` `onCreate(Bundle savedInstanceState) {`
</div>
<div class="line number21 index20 alt2">
` ``super``.onCreate(savedInstanceState);`
</div>
<div class="line number22 index21 alt1">
` ``setContentView(R.layout.main);`
</div>
<div class="line number23 index22 alt2">
` ``initWebView();`
</div>
<div class="line number24 index23 alt1">
` ``}`
</div>
<div class="line number25 index24 alt2">
` `
</div>
<div class="line number26 index25 alt1">
` `
</div>
<div class="line number27 index26 alt2">
` `
</div>
<div class="line number28 index27 alt1">
` ``//设置WebView`
</div>
<div class="line number29 index28 alt2">
` ``private` `void` `initWebView() {`
</div>
<div class="line number30 index29 alt1">
` ``mTestWebView = (TestWebView) findViewById(R.id.webView);`
</div>
<div class="line number31 index30 alt2">
` ``mTestWebView.setVerticalScrollBarEnabled(``true``);`
</div>
<div class="line number32 index31 alt1">
` ``mTestWebView.setHorizontalScrollBarEnabled(``false``);`
</div>
<div class="line number33 index32 alt2">
` ``mTestWebView.getSettings().setSupportZoom(``true``);`
</div>
<div class="line number34 index33 alt1">
` ``mTestWebView.getSettings().setBuiltInZoomControls(``true``);`
</div>
<div class="line number35 index34 alt2">
` ``mTestWebView.getSettings().setJavaScriptEnabled(``true``);`
</div>
<div class="line number36 index35 alt1">
` `
</div>
<div class="line number37 index36 alt2">
` ``mTestWebView.getSettings().setDomStorageEnabled(``true``);`
</div>
<div class="line number38 index37 alt1">
` ``mTestWebView.getSettings().setPluginsEnabled(``true``);`
</div>
<div class="line number39 index38 alt2">
` ``mTestWebView.requestFocus();`
</div>
<div class="line number40 index39 alt1">
` `
</div>
<div class="line number41 index40 alt2">
` ``mTestWebView.getSettings().setUseWideViewPort(``true``);`
</div>
<div class="line number42 index41 alt1">
` ``mTestWebView.getSettings().setLoadWithOverviewMode(``true``);`
</div>
<div class="line number43 index42 alt2">
` ``mTestWebView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);`
</div>
<div class="line number44 index43 alt1">
` `
</div>
<div class="line number45 index44 alt2">
` ``mTestWebView.loadUrl(``"http://www.ifeng.com"``);`
</div>
<div class="line number46 index45 alt1">
` ``mTestWebView.setWebViewClient(``new` `TestWebViewClient());`
</div>
<div class="line number47 index46 alt2">
` ``webViewScroolChangeListener();`
</div>
<div class="line number48 index47 alt1">
` `
</div>
<div class="line number49 index48 alt2">
` ``}`
</div>
<div class="line number50 index49 alt1">
` `
</div>
<div class="line number51 index50 alt2">
` ``//核心代码`
</div>
<div class="line number52 index51 alt1">
` ``private` `void` `webViewScroolChangeListener() {`
</div>
<div class="line number53 index52 alt2">
` ``mTestWebView.setOnCustomScroolChangeListener(``new` `ScrollInterface() {`
</div>
<div class="line number54 index53 alt1">
` ``@Override`
</div>
<div class="line number55 index54 alt2">
` ``public` `void` `onSChanged(``int` `l, ``int` `t, ``int` `oldl, ``int` `oldt) {`
</div>
<div class="line number56 index55 alt1">
` ``//WebView的总高度`
</div>
<div class="line number57 index56 alt2">
` ``float` `webViewContentHeight=mTestWebView.getContentHeight() * mTestWebView.getScale();`
</div>
<div class="line number58 index57 alt1">
` ``//WebView的现高度`
</div>
<div class="line number59 index58 alt2">
` ``float` `webViewCurrentHeight=(mTestWebView.getHeight() + mTestWebView.getScrollY());`
</div>
<div class="line number60 index59 alt1">
` ``System.out.println(``"webViewContentHeight="``+webViewContentHeight);`
</div>
<div class="line number61 index60 alt2">
` ``System.out.println(``"webViewCurrentHeight="``+webViewCurrentHeight);`
</div>
<div class="line number62 index61 alt1">
` ``if` `((webViewContentHeight-webViewCurrentHeight) == ````) {`
</div>
<div class="line number63 index62 alt2">
` ``System.out.println(``"WebView滑动到了底端"``);`
</div>
<div class="line number64 index63 alt1">
` ``}`
</div>
<div class="line number65 index64 alt2">
` ``}`
</div>
<div class="line number66 index65 alt1">
` ``});`
</div>
<div class="line number67 index66 alt2">
` ``}`
</div>
<div class="line number68 index67 alt1">
` `
</div>
<div class="line number69 index68 alt2">
</div>
<div class="line number70 index69 alt1">
` ``private` `class` `TestWebViewClient ``extends` `WebViewClient{`
</div>
<div class="line number71 index70 alt2">
` ``@Override`
</div>
<div class="line number72 index71 alt1">
` ``public` `void` `onPageStarted(WebView view, String url, Bitmap favicon) {`
</div>
<div class="line number73 index72 alt2">
` ``super``.onPageStarted(view, url, favicon);`
</div>
<div class="line number74 index73 alt1">
` ``}`
</div>
<div class="line number75 index74 alt2">
` ``@Override`
</div>
<div class="line number76 index75 alt1">
` ``public` `boolean` `shouldOverrideUrlLoading(WebView view, String url) {`
</div>
<div class="line number77 index76 alt2">
` ``view.loadUrl(url);`
</div>
<div class="line number78 index77 alt1">
` ``return` `true``;`
</div>
<div class="line number79 index78 alt2">
` ``}`
</div>
<div class="line number80 index79 alt1">
` ``@Override`
</div>
<div class="line number81 index80 alt2">
` ``public` `void` `onPageFinished(WebView view, String url) {`
</div>
<div class="line number82 index81 alt1">
` ``super``.onPageFinished(view, url);`
</div>
<div class="line number83 index82 alt2">
` `
</div>
<div class="line number84 index83 alt1">
` ``}`
</div>
<div class="line number85 index84 alt2">
` ``@Override`
</div>
<div class="line number86 index85 alt1">
` ``public` `void` `onReceivedError(WebView view, ``int` `errorCode,String description, String failingUrl) {`
</div>
<div class="line number87 index86 alt2">
` ``super``.onReceivedError(view, errorCode, description, failingUrl);`
</div>
<div class="line number88 index87 alt1">
` ``}`
</div>
<div class="line number89 index88 alt2">
` ``}`
</div>
<div class="line number90 index89 alt1">
` `
</div>
<div class="line number91 index90 alt2">
`}`
</div>
</div>
</td>
</tr>
</table>
</div>
</div>
TestWebView如下:
<div>
<div id="highlighter_625536" class="syntaxhighlighter java">
<div class="toolbar">
[?](http://www.open-open.com/lib/view/open1379383341959.html#)
</div>
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td class="gutter">
<div class="line number1 index0 alt2">
1
</div>
<div class="line number2 index1 alt1">
2
</div>
<div class="line number3 index2 alt2">
3
</div>
<div class="line number4 index3 alt1">
4
</div>
<div class="line number5 index4 alt2">
5
</div>
<div class="line number6 index5 alt1">
6
</div>
<div class="line number7 index6 alt2">
7
</div>
<div class="line number8 index7 alt1">
8
</div>
<div class="line number9 index8 alt2">
9
</div>
<div class="line number10 index9 alt1">
10
</div>
<div class="line number11 index10 alt2">
11
</div>
<div class="line number12 index11 alt1">
12
</div>
<div class="line number13 index12 alt2">
13
</div>
<div class="line number14 index13 alt1">
14
</div>
<div class="line number15 index14 alt2">
15
</div>
<div class="line number16 index15 alt1">
16
</div>
<div class="line number17 index16 alt2">
17
</div>
<div class="line number18 index17 alt1">
18
</div>
<div class="line number19 index18 alt2">
19
</div>
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20
</div>
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</div>
<div class="line number22 index21 alt1">
22
</div>
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</div>
<div class="line number24 index23 alt1">
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</div>
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</div>
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26
</div>
<div class="line number27 index26 alt2">
27
</div>
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28
</div>
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</div>
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</div>
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</div>
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</div>
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</div>
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</div>
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</div>
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</div>
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</div>
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</div>
<div class="line number40 index39 alt1">
40
</div>
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41
</div>
<div class="line number42 index41 alt1">
42
</div>
<div class="line number43 index42 alt2">
43
</div>
</td>
<td class="code">
<div class="container">
<div class="line number1 index0 alt2">
`package` `cn.testwebview;`
</div>
<div class="line number2 index1 alt1">
</div>
<div class="line number3 index2 alt2">
`import` `android.content.Context;`
</div>
<div class="line number4 index3 alt1">
`import` `android.util.AttributeSet;`
</div>
<div class="line number5 index4 alt2">
`import` `android.webkit.WebView;`
</div>
<div class="line number6 index5 alt1">
</div>
<div class="line number7 index6 alt2">
`public` `class` `TestWebView ``extends` `WebView {`
</div>
<div class="line number8 index7 alt1">
` ``public` `ScrollInterface mScrollInterface;`
</div>
<div class="line number9 index8 alt2">
</div>
<div class="line number10 index9 alt1">
` ``public` `TestWebView(Context context) {`
</div>
<div class="line number11 index10 alt2">
` ``super``(context);`
</div>
<div class="line number12 index11 alt1">
` ``}`
</div>
<div class="line number13 index12 alt2">
</div>
<div class="line number14 index13 alt1">
` ``public` `TestWebView(Context context, AttributeSet attrs, ``int` `defStyle) {`
</div>
<div class="line number15 index14 alt2">
` ``super``(context, attrs, defStyle);`
</div>
<div class="line number16 index15 alt1">
` ``}`
</div>
<div class="line number17 index16 alt2">
</div>
<div class="line number18 index17 alt1">
` ``public` `TestWebView(Context context, AttributeSet attrs) {`
</div>
<div class="line number19 index18 alt2">
` ``super``(context, attrs);`
</div>
<div class="line number20 index19 alt1">
` ``}`
</div>
<div class="line number21 index20 alt2">
</div>
<div class="line number22 index21 alt1">
` ``@Override`
</div>
<div class="line number23 index22 alt2">
` ``protected` `void` `onScrollChanged(``int` `l, ``int` `t, ``int` `oldl, ``int` `oldt) {`
</div>
<div class="line number24 index23 alt1">
</div>
<div class="line number25 index24 alt2">
` ``super``.onScrollChanged(l, t, oldl, oldt);`
</div>
<div class="line number26 index25 alt1">
</div>
<div class="line number27 index26 alt2">
` ``mScrollInterface.onSChanged(l, t, oldl, oldt);`
</div>
<div class="line number28 index27 alt1">
</div>
<div class="line number29 index28 alt2">
` ``}`
</div>
<div class="line number30 index29 alt1">
</div>
<div class="line number31 index30 alt2">
` ``public` `void` `setOnCustomScroolChangeListener(ScrollInterface scrollInterface) {`
</div>
<div class="line number32 index31 alt1">
</div>
<div class="line number33 index32 alt2">
` ``this``.mScrollInterface = scrollInterface;`
</div>
<div class="line number34 index33 alt1">
</div>
<div class="line number35 index34 alt2">
` ``}`
</div>
<div class="line number36 index35 alt1">
</div>
<div class="line number37 index36 alt2">
` ``public` `interface` `ScrollInterface {`
</div>
<div class="line number38 index37 alt1">
</div>
<div class="line number39 index38 alt2">
` ``public` `void` `onSChanged(``int` `l, ``int` `t, ``int` `oldl, ``int` `oldt);`
</div>
<div class="line number40 index39 alt1">
</div>
<div class="line number41 index40 alt2">
` ``}`
</div>
<div class="line number42 index41 alt1">
</div>
<div class="line number43 index42 alt2">
`}`
</div>
</div>
</td>
</tr>
</table>
</div>
</div>
main.xml如下:
<div>
<div id="highlighter_380669" class="syntaxhighlighter xml">
<div class="toolbar">
[?](http://www.open-open.com/lib/view/open1379383341959.html#)
</div>
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td class="gutter">
<div class="line number1 index0 alt2">
1
</div>
<div class="line number2 index1 alt1">
2
</div>
<div class="line number3 index2 alt2">
3
</div>
<div class="line number4 index3 alt1">
4
</div>
<div class="line number5 index4 alt2">
5
</div>
<div class="line number6 index5 alt1">
6
</div>
<div class="line number7 index6 alt2">
7
</div>
<div class="line number8 index7 alt1">
8
</div>
<div class="line number9 index8 alt2">
9
</div>
<div class="line number10 index9 alt1">
10
</div>
<div class="line number11 index10 alt2">
11
</div>
<div class="line number12 index11 alt1">
12
</div>
<div class="line number13 index12 alt2">
13
</div>
<div class="line number14 index13 alt1">
14
</div>
<div class="line number15 index14 alt2">
15
</div>
<div class="line number16 index15 alt1">
16
</div>
</td>
<td class="code">
<div class="container">
<div class="line number1 index0 alt2">
`<``RelativeLayout`
</div>
<div class="line number2 index1 alt1">
` ``xmlns:android``=``"http://schemas.android.com/apk/res/android"`
</div>
<div class="line number3 index2 alt2">
` ``xmlns:tools``=``"http://schemas.android.com/tools"`
</div>
<div class="line number4 index3 alt1">
` ``android:layout_width``=``"match_parent"`
</div>
<div class="line number5 index4 alt2">
` ``android:layout_height``=``"match_parent"`
</div>
<div class="line number6 index5 alt1">
` ``>`
</div>
<div class="line number7 index6 alt2">
</div>
<div class="line number8 index7 alt1">
` ``<``cn.testwebview.TestWebView`
</div>
<div class="line number9 index8 alt2">
` ``android:id``=``"@+id/webView"`
</div>
<div class="line number10 index9 alt1">
` ``android:layout_width``=``"fill_parent"`
</div>
<div class="line number11 index10 alt2">
` ``android:layout_height``=``"fill_parent"`
</div>
<div class="line number12 index11 alt1">
` ``android:text``=``"@string/hello_world"`
</div>
<div class="line number13 index12 alt2">
` ``android:layout_centerInParent``=``"true"`
</div>
<div class="line number14 index13 alt1">
` ``/>`
</div>
<div class="line number15 index14 alt2">
</div>
<div class="line number16 index15 alt1">
`</``RelativeLayout``>`
</div>
</div>
</td>
</tr>
</table>
</div>
</div>
</div>
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