从JavaScript中调用Android的方法方法、JavaScript、Android
2023-09-05 10:33:46
作者：你不是我，所以不用懂我╰
我搜索，但我没有找到答案。我开发一个Android应用程序基于web视图，使用HTML5和JavaScript。我可以调用Android的方法，如 makeToast（）从JavaScript？
I searched, but I didn't find an answer. I'm developing an Android app based on webview, using HTML5 and JavaScript. Can I call an Android method, like makeToast() from JavaScript?
推荐答案
您可以通过添加一个JavaScript接口连接到您的WebView和揭露具体方法给JavaScript code运行在Web视图做到这一点。换句话说，你需要来包装你在活动/片段创建一个方法的调用Android的吐司类。
You can do this by adding a JavaScript Interface to your WebView and exposing specific methods to the JavaScript code running in your web view. In other words, you'll need to wrap the calls to Android's Toast class in a method you create in your activity/fragment.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<WebView android:id="@+id/web_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
</RelativeLayout>
MainActivity.java
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
WebView webView = (WebView)findViewById(R.id.web_view);
webView.loadUrl("file:///android_asset/web.html");
webView.getSettings().setJavaScriptEnabled(true);
webView.addJavascriptInterface(new WebViewJavaScriptInterface(this), "app");
}
/*
* JavaScript Interface. Web code can access methods in here
* (as long as they have the @JavascriptInterface annotation)
*/
public class WebViewJavaScriptInterface{
private Context context;
/*
* Need a reference to the context in order to sent a post message
*/
public WebViewJavaScriptInterface(Context context){
this.context = context;
}
/*
* This method can be called from Android. @JavascriptInterface
* required after SDK version 17.
*/
@JavascriptInterface
public void makeToast(String message, boolean lengthLong){
Toast.makeText(context, message, (lengthLong ? Toast.LENGTH_LONG : Toast.LENGTH_SHORT)).show();
}
}
}
资产/ web.html
<!DOCTYPE html>
<html>
<head>
<title>JavaScript View</title>
<script type="text/javascript">
function showToast(){
var message = document.getElementById("message").value;
var lengthLong = document.getElementById("length").checked;
/*
Call the 'makeToast' method in the Java code.
'app' is specified in MainActivity.java when
adding the JavaScript interface.
*/
app.makeToast(message, lengthLong);
return false;
}
/*
Call the 'showToast' method when the form gets
submitted (by pressing button or return key on keyboard).
*/
window.onload = function(){
var form = document.getElementById("form");
form.onsubmit = showToast;
}
</script>
</head>
<body>
<form id="form">
Message: <input id="message" name="message" type="text"/><br />
Long: <input id="length" name="length" type="checkbox" /><br />
<input type="submit" value="Make Toast" />
</form>
</body>
</html>
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