我正在尝试从Webview中的javascript界面开始一项活动。该示例显示了一个烤面包。我怎么能称呼课程而不是敬酒？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();}}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);}
2 回答
跃然一笑
TA贡献1826条经验 获得超6个赞
您必须先在Webview上注册JavaScriptInterface。JavaScriptInterFace可以是一个内部类，如下所示。此类将具有一个您可以从html page（通过javaScript）调用的函数，并且在该函数内部，您可以编写代码以更改活动。
这是适合您的解决方案：
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();
}
}
}
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>
希望这可以帮助...
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