Is it possible to use Javascript to close Android Browser?

I want to put a "close" button in a web page (our client wants to do that)

and when I 开发者_开发百科click this button, I want to close Browser (not the current tab but "browser" in Android Browser, IE, Firefox, Chrome etc.).

I've searched around and found a method: window.close() but seems to only work on IE.

My question is:

Is there any way to close Android Browser using Javascript?

Nope - and that's a Good Thing: the webpage has no business messing with the browser itself ("wait, where did my window go? I had like 30 tabs in there - poof, gone!"), not to mention a glaring vulnerability:

1. insert an XSS into legitpage.example.com
2. when it gets activated, open a pop-under window of evilpage.example.net, which looks just like legitpage.example.com
3. close legitpage.example.com (if 2&3 are fast enough, the user may be fooled that xe's still on legitpage.example.com)
4. ???
5. Profit!

This is not possible, and never will be.

window.close() actually works for Web Apps that were added to the home screen (with Chrome Beta).

It cleanly closes the app and gets back to the home screen.

Android browser allows JavaScript to close only popup windows. Hence there is no way to close window, unless it has been created as a popup window.

Well, a simple work-around for this would be to create an activity with full screen WebView control, display your HTML contents (local or from the Internet) there, and add a button to close this window, with a callback to Java to close this activity. Here is all the code you would need:

browser.xml layout file:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:orientation="vertical"
          android:layout_width="fill_parent"
          android:layout_height="fill_parent"
          android:background="#404040"
          android:id="@+id/mainLayout"
    >
    <WebView android:id="@+id/webkit"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent"
         android:layout_marginBottom="2dp"
         android:layout_weight="1"
         android:scrollbars="vertical"
         android:visibility="visible"
        />

</LinearLayout>

myBrowser.java activity (remember to declare it also in AndroidManifest.xml):

public class myBrowser extends Activity {
    protected WebView webView;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // if you don't want app title bar...
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.browser);
        webView = (WebView) findViewById(R.id.webkit);
        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webView.addJavascriptInterface(new MyJavaCallback(), "JCB");

        // get the URL to navigate to, sent in Intent extra
        Intent intent = getIntent();
        if (intent != null) {
            String sUrl = intent.getStringExtra("url");
            if (sUrl != null)
                webView.loadUrl(sUrl);
        }
    }

    final public class MyJavaCallback {
        // this annotation is required in Jelly Bean and later:
        @JavascriptInterface
        public void finishActivity() {
            finish();
        }
    }
}

The code to start this activity elsewhere in your app would be:

    Intent intent = new Intent(context, myBrowser.class);
    intent.putExtra("url", "http://www.someaddress.com/somepage.html");
    startActivity(intent);

and your somepage.html web page could have a "Close" button with the following code:

<button onclick="JCB.finishActivity()">Close</button>

You may add as well other buttons and callbacks for them to do what's needed in your Android Java code. Calls the other way - from Java to JavaScript on the page, are also possible, e.g.:

webView.loadUrl("javascript:functionName(params)");

Also, if you want to display content from Internet, not a local file or string in your WebView control, remember to add to AndroidManifest.xml the necessary permission:

<uses-permission android:name="android.permission.INTERNET" />

Greg