Browser : Clear Search History -- Part I

找一下 "的網頁指出" ..
結果在：

base/core/res/res/values-zh-rTW/strings.xml:

<string name="js_dialog_title" msgid="8143918455087008109">"「<xliff:g id="TITLE">%s</xliff:g>」的網頁指出："</string>

view raw gistfile1.xml hosted with ❤ by GitHub

使用者是：

base/core/java/android/webkit/CallbackProxy.java

	private String getJsDialogTitle(String url) {
	String title = url;
	if (URLUtil.isDataUrl(url)) {
	// For data: urls, we just display 'JavaScript' similar to Safari.
	title = mContext.getString(R.string.js_dialog_title_default);
	} else {
	try {
	URL aUrl = new URL(url);
	// For example: "The page at 'http://www.mit.edu' says:"
	title = mContext.getString(R.string.js_dialog_title,
	aUrl.getProtocol() + "://" + aUrl.getHost());
	} catch (MalformedURLException ex) {
	// do nothing. just use the url as the title
	}
	}
	return title;
	}

view raw gistfile1.java hosted with ❤ by GitHub

猜是 confirm dialog:

	case JS_CONFIRM:
	if (mWebChromeClient != null) {
	final JsResult res = (JsResult) msg.obj;
	String message = msg.getData().getString("message");
	String url = msg.getData().getString("url");
	if (!mWebChromeClient.onJsConfirm(mWebView, url, message,
	res)) {
	new AlertDialog.Builder(mContext)
	.setTitle(getJsDialogTitle(url))
	.setMessage(message)
	.setPositiveButton(R.string.ok,
	new DialogInterface.OnClickListener() {
	public void onClick(
	DialogInterface dialog,
	int which) {
	res.confirm();
	}})
	.setNegativeButton(R.string.cancel,
	new DialogInterface.OnClickListener() {
	public void onClick(
	DialogInterface dialog,
	int which) {
	res.cancel();
	}})
	.setOnCancelListener(
	new DialogInterface.OnCancelListener() {
	public void onCancel(
	DialogInterface dialog) {
	res.cancel();
	}
	})
	.show();
	}
	// Tell the JsResult that it is ready for client
	// interaction.
	res.setReady();
	}
	break;

view raw gistfile1.java hosted with ❤ by GitHub

所以是在處理 javascript 的 alert。

其中有 mWebChromeClient 不是 null 時，才會處理。

在 browser/Tab.java 中，有使用 setWebChromeClient..

所以... setWebViewClient( ) 和 setWebChromeClient( ) 的不同處是...？

ref: http://stackoverflow.com/questions/2835556/whats-the-difference-between-setwebviewclient-vs-setwebchromeclient

setWebChromeClient( ) 會處理 JS Alert。

拿 http://www.mkyong.com/tutorials/android-tutorial/ 的 WebView Example code 來測試這個 javascript alert 頁面。

	package com.mkyong.android;
	import android.app.Activity;
	import android.os.Bundle;
	import android.webkit.WebChromeClient;
	import android.webkit.WebView;
	import android.webkit.WebViewClient;
	public class WebViewActivity extends Activity {
	private WebView webView;
	public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.webview);
	webView = (WebView) findViewById(R.id.webView1);
	webView.getSettings().setJavaScriptEnabled(true);
	webView.setWebViewClient(new WebViewClient());
	webView.setWebChromeClient(new WebChromeClient());
	webView.loadUrl("http://lexandera.com/files/jsexamples/alert.html");
	}
	}

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試著拿掉 setWebChromeClient( ) 這行，執行時，就不會出現 dialog