在android webview中使用javascript
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using javascript in android webview
提问by Common
I'm trying to start an activity from a javascript interface in my webview. The example shows a toast. How could i call a class instead of a toast?
我正在尝试从我的 web 视图中的 javascript 界面开始一项活动。该示例显示了吐司。我怎么能叫一个班而不是一个祝酒词？
public class JavaScriptInterface {
Context mContext;
/** Instantiate the interface and set the context */
JavaScriptInterface(Context c) {
mContext = c;
}
/** Show a toast from the web page */
public void showToast(String toast) {
Toast.makeText(mContext, toast, Toast.LENGTH_SHORT).show();
}
}
this for the html page.
这是 html 页面。
<input type="button" value="Say hello" onClick="showAndroidToast('Hello Android!')" />
<script type="text/javascript">
function showAndroidToast(toast) {
Android.showToast(toast);
}
回答by Akshay
You have to first register the JavaScriptInterface on your webview. JavaScriptInterFace can be a inner class as shown below. This class will have a function that you can call from html page( via javaScript ) and inside this function you can write code to change activity.
你必须首先在你的 webview 上注册 JavaScriptInterface。JavaScriptInterFace 可以是一个内部类，如下所示。此类将有一个函数，您可以从 html 页面（通过 javaScript ）调用该函数，在此函数中，您可以编写代码来更改活动。
Here is the working solution for you:
这是适合您的工作解决方案：
public class JavascriptInterfaceActivity extends Activity {
/** Called when the activity is first created. */
WebView wv;
JavaScriptInterface JSInterface;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
wv = (WebView)findViewById(R.id.webView1);
wv.getSettings().setJavaScriptEnabled(true);
// register class containing methods to be exposed to JavaScript
JSInterface = new JavaScriptInterface(this);
wv.addJavascriptInterface(JSInterface, "JSInterface");
wv.loadUrl("file:///android_asset/myPage.html");
}
public class JavaScriptInterface {
Context mContext;
/** Instantiate the interface and set the context */
JavaScriptInterface(Context c) {
mContext = c;
}
@android.webkit.JavascriptInterface
public void changeActivity()
{
Intent i = new Intent(JavascriptInterfaceActivity.this, nextActivity.class);
startActivity(i);
finish();
}
}
}
Here is the html page
这是html页面
<html>
<head>
<script type="text/javascript">
function displaymessage()
{
JSInterface.changeActivity();
}
</script>
</head>
<body>
<form>
<input type="button" value="Click me!" onclick="displaymessage()" />
</form>
</body>
</html>
Hope this helps...
希望这可以帮助...
回答by goseib
You also need to add the @android.webkit.JavascriptInterfaceannotation on top of your changeActivitymethod in your android code, should you run on Android 4.2 or higher.
See this linkfor more.
如果您在 Android 4.2 或更高版本上运行，您还需要在您的 android 代码中的方法顶部添加@android.webkit.JavascriptInterface注释changeActivity。请参阅此链接了解更多信息。
