android开发webview的gettitle()不等于“XXX”geturl()也不等“xxx”

需要用到回调

webViewsetWebChromeClient(new WebChromeClient()

{

@Override

public void onReceivedTitle(WebView view, String aTitle)

{

// 设置当前activity的标题栏

titlesetText(aTitle);

superonReceivedTitle(view, aTitle);

}

});

这里就假设你的标题文本框是TextView titleTextView, 地址文本框是TextView urlTextView。

//设置WebChromeClient来接受网页加载后得到的标题，然后设置给title

webViewsetWebChromeClient(new WebChromeClient() {

@Override

public void onReceivedTitle(WebView view, String title){

superonReceivedTitle(view, title);

titleTextViewsetText(title);

}

}

)

//设置WebViewClient来获取网页url

webViewsetWebViewClient(new HelpClient(){

@Override

public void onPageFinished(WebView view, String url) {

superonPageFinished(view, url);

urlTextViewsetText(url);

}

@Override

public void onPageStarted(WebView view, String url, Bitmap favicon) {

superonPageStarted(view, url, favicon);

}

});

The extensive Android SDK allows you to do many great things with particular views like the WebView for displaying webpages on Android powered devices

Android SDK 的扩展通过使用特定的view允许你做许多事情比如WebView用来在Android手机上展示网页

As of lately while I was experimenting with the Android SDK I was using a WebView in one of my activities

最近我在体验Android SDK的时候在一个Activity中用到了WebView

From that particular WebView I needed to know the ContentHeight but also the ContentWidth

从WebView我不但想要知道ContentHeight还想知道ContentWidth

Now getting the contentHeight is easy like so:

现在的情况是获取contentHeight很easy如下

webviewgetContentHeight();

Unfortunately getting the contentWidth from a WebView is rather more difficult since there is not a simple method like:

不幸的是从一个WebView获取contentWidth是相当困难因为SDK中没有一个像这样的方法

// THIS METHOD DOES NOT EXIST!

webviewgetContentWidth();

There are ways to get the contentWidth of the rendered HTML page and that is through Javascript If Javascript can get it for you then you can also have them in your Java code within your Android App

当然是有方法获取contentWidth的就是通过Javascript来获取如果你能够支持Javascript那么你就可以在你的Android 程序中使用java代码来获取宽度

By using a JavascriptInterface with your WebView you can let Javascript communicate with your Android App Java code by invoking methods on a registered object that you can embed using the JavascriptInterface

通过在你的WebView中使用JavascriptInterface通过调用你注册的JavascriptInterface方法可以让Javascript和你的Android程序的java代码相互连通

So how does this work

怎么做呢？

For a quick example I created a simple Activity displaying a webview that loads a webpage wich displays a log message and a Toast message with the contentWidth wich was determined using Javascript Note that this happens AFTER the page was finished loading because before the page is finished loading the width might not be fully rendered Also keep in mind that if there is content loaded asynchronously that it doesnt affect widths (most likely only heights will be affected as the width is almost always fully declared in CSS files unless you have a % width webpage)

搭建一个快速的例子创建一个简单的展示webView的Activity一个LogCat消息一个Toast消息用来显示我们通过 Javascript获取的宽度注意这些会在网页完全加载之后显示因为在网页加载完成之前宽度可能不能够正确的获取到同时也要注意到如果是异 步加载这并不影响宽度（最多高度会受影响因为宽度总是在CSS文件中做了完全的定义除非在网页中你用了%宽度）

Below is the code of the Activity Mainjava:

下面的代码是Activity的代码

package compimmosandroidsampleswebviewcontentwidth;

import androidappActivity;

import androidosBundle;

import androidutilLog;

import androidwebkitWebView;

import androidwebkitWebViewClient;

import androidwidgetToast;

publicclass Main extends Activity {

privatefinalstatic String LOG_TAG = "WebViewContentWidth";

privatefinal Activity activity = this;

privatestaticint webviewContentWidth = ;

privatestatic WebView webview;

/ Called when the activity is first created /

@Override

publicvoid onCreate(Bundle savedInstanceState) {

superonCreate(savedInstanceState);

setContentView(Rlayoutmain);

webview = (WebView) findViewById(Ridwebview);

webviewgetSettings()setJavaScriptEnabled(true);

webviewsetSaveEnabled(true);

webviewaddJavascriptInterface(new JavaScriptInterface() "HTMLOUT");

webviewsetWebViewClient(new WebViewClient() {

@Override

publicvoid onPageFinished(WebView view String url) {

webviewloadUrl("javascript:windowHTMLOUTgetContentWidth(documentgetElementsByTagName(html)[]scrollWidth);");

}

});

webviewloadUrl(";);

}

class JavaScriptInterface {

publicvoid getContentWidth(String value) {

if (value != null) {

webviewContentWidth = IntegerparseInt(value);

Logd(LOG_TAG "Result from javascript: " + webviewContentWidth);

ToastmakeText( activity

"ContentWidth of webpage is: " +

webviewContentWidth +

"px" ToastLENGTH_SHORT)show();

}

}

}

}

Below is the XML layout used with the Activity wich only contains a simple WebView:

下面是Activity的Layout主要就是一个简单的WebView

<xml version="" encoding="utf">

<LinearLayout

xmlns:android=";

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent">

<WebView android:id="@+id/webview"

android:layout_width="fill_parent"

android:layout_height="fill_parent" />

</LinearLayout>

AndroidManifestxml layout:

AndroidManifestxml代码

<xml version="" encoding="utf">

<manifest

xmlns:android=";

package="compimmosandroidsampleswebviewcontentwidth"

android:versionCode="" android:versionName="">

<application android:icon="@drawable/icon"

android:label="@string/app_name">

<activity android:name="Main"

android:label="@string/app_name">

<intentfilter>

<action android:name="androidintentactionMAIN" />

<category

android:name="androidintentcategoryLAUNCHER" />

</intentfilter>

</activity>

</application>

<usessdk android:minSdkVersion="" />

<usespermission android:name="androidpermissionINTERNET" />

</manifest>

You can also download the full source of Android Application WebViewContentWidth!

启用JavaScript

定义Java接口，暴露方法给JavaScript

绑定一个命名为Android的接口给WebView,

在JavaScript中使用这个接口

点击WebView中的链接的默认行为是启动默认浏览器打开这个URL。如果想要在自己的WebView中打开：

复写WebViewClient的shouldOverrideUrlLoading方法：

canGoBack()如果实际存在用户要访问的网页历史记录，则该方法返回true。同样，您可以使用canGoForward()检查是否存在转发历史记录。如果您不执行此检查，则一旦用户到达历史记录的末尾，goBack()或goForward()什么都不做。

WebSettings用来对WebView做各种设置, 你可以这样获取WebSettings:

<pre><code>

WebSettings webSettings = mWebView getSettings();

</code></pre>

WebSettings的常见设置如下所示:

WebViewClient用来帮助WebView处理各种通知, 请求事件。我们通过继承WebViewClient并重载它的方法可以实现不同功能的定制。主要方法:

WebChromeClient用来帮助WebView处理JS的对话框、网址图标、网址标题和加载进度等。同样地, 通过继承WebChromeClient并重载它的方法也可以实现不同功能的定制, 如下所示:

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