android_webView加载.html资料

2012-09-15

android_webView加载.html文件首先在layout文件夹下的xml中加入Java代码??WebView??android:id@+id/wv

android_webView加载.html文件

首先在layout文件夹下的xml中加入

Java代码?

?<WebView??
android:id="@+id/wv1"??
android:layout_width="fill_parent"??
android:layout_height="fill_parent"??
/>??

Java代码?

public?class?jsWebDemo?extends?Activity?{??
????/**?Called?when?the?activity?is?first?created.?*/??
????@Override??
????public?void?onCreate(Bundle?savedInstanceState)?{??
????????super.onCreate(savedInstanceState);??
????????setContentView(R.layout.main);???
????????WebView?wView?=?(WebView)findViewById(R.id.wv1);??
??????????
????????ProxyBridge?pBridge?=?new?ProxyBridge();??
????????wView.addJavascriptInterface(pBridge,?"AliansBridge");??
??????????
????????WebSettings?wSet?=?wView.getSettings();??
????????wSet.setJavaScriptEnabled(true);??
??????????
????????wView.loadUrl("file:///android_asset/index.html");??
??????????
????}??
??
????public?class?ProxyBridge?{??
????????public?int?one?()?{??
????????????return?1;??
????????}??
????}??
??
}??

? wView.addJavascriptInterface(pBridge, "AliansBridge");
上句代码是实例化一个方法为的是在html中的js中调用，第二个参数则是实例化方法的别名，如果要使用这个pBridge，则在js中使用的名字就是AliansBridge。

?WebSettings wSet = wView.getSettings();
??????? wSet.setJavaScriptEnabled(true);
上面两句就是允许使用js的意思

wView.loadUrl(file:///android_asset/index.html);
就是在asset下放入一个index.html文件，这个文件包含js的代码，注意路径是“///”，这个android_asset不是文件夹的名字是系统自动生成的，其实就是asset文件夹的系统路径。?

index.html 内容如下

Java代码?

<html><body>??
<div?id="output">Test?page.</div>??
<input?type="submit"?value="change?to?1"?onclick="document.getElementById('output').innerHTML?=?AliansBridge.one()"?/>??
</body></html>??

?这里要注意如果你只有一个方法需要被js调用

?ProxyBridge pBridge = new ProxyBridge();
??????? wView.addJavascriptInterface(pBridge, "AliansBridge");

如果你需要调用好多个方法呢这里只要

?wView.addJavascriptInterface(this, "AliansBridge");

把整个android程序所在的类本身实例化传递就可以了

这里呢可以参看附件中的实例riademo

你如果想继续扩展可以参看

http://www.ophonesdn.com/article/show/115

?2.上面是javascript调用android的方法，那么android也可以调用js的方法

Java代码?

public?class?webJsDemo?extends?Activity?{??
????/**?Called?when?the?activity?is?first?created.?*/??
????private?WebView?mWebView;??
?????private?Handler?mHandler?=?new?Handler();?????
???????
????@Override??
????public?void?onCreate(Bundle?savedInstanceState)?{??
????????super.onCreate(savedInstanceState);??
????????setContentView(R.layout.main);??
????????mWebView?=?(WebView)?findViewById(R.id.wv1);?????
??????????
????????WebSettings?webSettings?=?mWebView.getSettings();?????
????????webSettings.setSavePassword(false);?????
????????webSettings.setSaveFormData(false);?????
????????webSettings.setJavaScriptEnabled(true);?????
????????webSettings.setSupportZoom(false);?????
?????????
????????mWebView.setWebChromeClient(new?MyWebChromeClient());?????
????
????????mWebView.addJavascriptInterface(new?DemoJavaScriptInterface(),?"demo");?????
????
????????mWebView.loadUrl("file:///android_asset/demo.html");?????
????}?????
????
????final?class?DemoJavaScriptInterface?{?????
????
????????DemoJavaScriptInterface()?{?????
????????}?????
????
????????/**???
?????????*?This?is?not?called?on?the?UI?thread.?Post?a?runnable?to?invoke???
?????????*?loadUrl?on?the?UI?thread.???
?????????*/????
????????public?void?clickOnAndroid()?{????
??????????????
????????????mHandler.post(new?Runnable()?{?????
????????????????public?void?run()?{?????
????????????????????mWebView.loadUrl("javascript:wave()");?????
????????????????}?????
????????????});?????
????
????????}?????
????}?????
????
????/**???
?????*?Provides?a?hook?for?calling?"alert"?from?javascript.?Useful?for???
?????*?debugging?your?javascript.???
?????*/????
????final?class?MyWebChromeClient?extends?WebChromeClient?{?????
????????@Override??
????????public?boolean?onJsAlert(WebView?view,?String?url,?String?message,??
????????????????JsResult?result)?{??
????????????//?TODO?Auto-generated?method?stub??
????????????Log.d("aa",?message);????
????????????Log.d("url",?url);??
????????????Log.d("result",?""+result);??
??????????????
????????????result.confirm();???
????????return?super.onJsAlert(view,?url,?message,?result);??
??????????????
????????}??
??
??????????
????}?????

其中上面的代码也提到了怎么在android中调试js? mWebView.setWebChromeClient(new MyWebChromeClient());??

上面的代码来源于别人的实例。

最后还要注意在这个实例中demo.html和两个image应该在同一个文件夹asset下

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