ANDROID / WEBVIEW--未捕获类型错误：对象的翻译：具有在文件中没有方法'changeActivity“： [英] ANDROID/WEBVIEW-- Uncaught TypeError: Object [object Object] has no method 'changeActivity' at file:

问题描述

我试图用一个WebView的输入框，走串，并将它传递给第二个活动。出于某种原因，该按钮没有做任何事情，我得到的错误：

I am trying to use a webview with an input box, take the string, and pass it to a second activity. For some reason, the button is not doing anything and I get the error:

未捕获类型错误：对象的翻译：没有方法'changeActivity'的文件：///android_asset/www/index.js：3

Uncaught TypeError: Object [object Object] has no method 'changeActivity' at file:///android_asset/www/index.js:3

所以，我的HTML这样说：

So my HTML says this:

 <input id="name" value="" />&nbsp;&nbsp;&nbsp;
<button onclick="checkMovie()"> Check it! </button>

---

我的JS这样说：

---

my JS says this:

    function checkMovie() {
var movieName = document.getElementById('name').value;
webapi.changeActivity(movieName);}

和我的Andr​​oid code这样说：

and my Android code says this:

public class MainActivity extends Activity implements OnClickListener {
// Setting up known variables
JavaScriptInterface JSInterface;

Button find;

@SuppressLint("SetJavaScriptEnabled")
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // changing main layout to show the splash first
    setContentView(R.layout.activity_main);
    // Tie my webviews and set up the webview to handle JS
    WebView webView = (WebView) findViewById(R.id.webView);
    webView.getSettings().setJavaScriptEnabled(true);
    // Expecting UI
    webView.setWebChromeClient(new WebChromeClient());
    // allowing to inject Java objects into a page's JavaScript
    webView.addJavascriptInterface(new JavaScriptInterface(this), "webapi");
    // Load the local file
    webView.loadUrl("file:///android_asset/www/index.html");

    find = new Button(MainActivity.this);
    find.setOnClickListener(this);

    WebSettings ws = webView.getSettings();
    ws.setJavaScriptEnabled(true);
    // Add the interface to record javascript events
    webView.addJavascriptInterface(find, "find");

}

public class JavaScriptInterface {
    Context mContext;



// Instantiate the interface and set the context
    JavaScriptInterface(Context c) {
        mContext = c;
    }

    // Call the function changeActivity defined in my JS of my HTML
    public void changeActivity(String movieName) {
        // Call the Movie App and store the intent to pass it onto the app.
        Log.e("XXXXXXXXXXXXXXX", "X==========>" + movieName);
        Intent i = new Intent(MainActivity.this, second.class);
        i.putExtra("movie_name", movieName);
        startActivity(i);
    }

}

@Override
public void onClick(View v) {
    // TODO Auto-generated method stub

    if (v.equals(find)) {
        Log.e("XXXXXXXXXXXXXXX", "XXXXXXXXXXXXXXX");

    }
}

}

推荐答案

现在的问题是这一点。既然你在4.2.2上运行，你必须将 @JavascriptInterface 在changeActivity方法的顶部和你在你的Andr​​oid code调用任何其他JavaScript方法的注释。

The problem is exactly that. Since you run on 4.2.2 you have to set the @JavascriptInterface annotation on top of your changeActivity method and on any other javascript methods you call in your android code.

@JavascriptInterface
public void changeActivity(String movieName) {
    ...

这是必要的为Android 4.2或更高版本。

This is necessary for Android 4.2 or higher.

按照此<一个href=\"http://stackoverflow.com/questions/14031635/android-4-2-1-webview-and-javascript-interface-breaks\">link阅读更多。

这篇关于ANDROID / WEBVIEW--未捕获类型错误：对象的翻译：具有在文件中没有方法'changeActivity“：的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！