WebView的使用

最新推荐文章于 2021-11-08 16:56:18 发布

原创最新推荐文章于 2021-11-08 16:56:18 发布 · 330 阅读

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转载自:http://www.cnblogs.com/soaringEveryday/p/4495221.html

这里讲下js和java的互调

java代码

public class MainActivity extends Activity {

	private WebView mWebView;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		showWebView();
	}

	private void showWebView() {

		// webView与js交互代码
		try {
			mWebView = new WebView(this);
			setContentView(mWebView);

			mWebView.requestFocus();
			// 必须设置WebChromeClient
			mWebView.setWebChromeClient(new WebChromeClient() {});

			mWebView.setOnKeyListener(new View.OnKeyListener()
			{
				@Override
				public boolean onKey(View v, int keyCode, KeyEvent event) {
					if (keyCode == KeyEvent.KEYCODE_BACK
							&& mWebView.canGoBack()) {
						mWebView.goBack();
						return true;
					}
					return false;
				}
			});

			WebSettings webSettings = mWebView.getSettings();
			// 必须支持JavaScriptEnabled
			webSettings.setJavaScriptEnabled(true);
			webSettings.setDefaultTextEncodingName("utf-8");
			// 给html提供java 的对象，必须在loadUrl之前调用
			mWebView.addJavascriptInterface(getHtmlObject(), "jsObj");
			mWebView.loadUrl("file:///android_asset/test.html");
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

	private Object getHtmlObject() {
		Object insertObj = new Object() {
			// 4.2后，必须加@JavascriptInterface，不加js调用不了
			@JavascriptInterface
			public String HtmlcallJava() {
				return "Html call Java haha";
			}
			@JavascriptInterface
			public String HtmlcallJava2(final String param) {
				return "Html call Java : " + param;
			}
			@JavascriptInterface
			public void JavacallHtml() {
				runOnUiThread(new Runnable() {
					@Override
					public void run() {
						// java 调用js代码
						mWebView.loadUrl("javascript: showFromHtml()");
					}
				});
			}
			@JavascriptInterface
			public void JavacallHtml2() {
				runOnUiThread(new Runnable() {
					@Override
					public void run() {
						mWebView.loadUrl("javascript: showFromHtml2('aaa')");
					}
				});
			}
		};

		return insertObj;
	}
}

	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
	<!-- saved from url=(0032)http://localhost:8080/jsandroid/ -->
		<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
		<meta http-equiv="Expires" content="0">
		<meta http-equiv="Pragma" content="no-cache">
		<meta http-equiv="Cache-Control" content="no-store,no-cache">
		<meta name="Handheldfriendly" content="true">
		<meta name="viewport" content="width=100%; initial-scale=1.0; user-scalable=yes">
		<meta name="robots" content="all">
		<meta name="keywords" contect="doodle, mobile, doodlemobile, game, games">
		<meta name="description" content="Make People's Mobile Life More Connected Through Games.">
		<title>jsandroid_test</title>
		<script type="text/javascript" language="javascript"> 
			function showHtmlcallJava(){
					var str = window.jsObj.HtmlcallJava();
					alert(str);
				}
			function showHtmlcallJava2(){
				var str = window.jsObj.HtmlcallJava2("HtmlcallJava2 hehe");
				alert(str);
				}
			function showFromHtml(){
					document.getElementById("id_input").value = "Java call Html";
				}
			function showFromHtml2( param ){
				document.getElementById("id_input2").value = "Java call Html : " + param; 
				}
		</script>
		</head>
		<body>
		我是html
		<br>
		<br>
		<br>
		<input type="button" value="HtmlcallJava" onclick="showHtmlcallJava()" />
	<br>
		<input type="button" value="HtmlcallJava2" onclick="showHtmlcallJava2()" />
		<br>
		<br>
		<br>
		<br>
		<input id="id_input" style="width: 90%" type="text" value="null" />
		<br>
		<input type="button" value="JavacallHtml" onclick="window.jsObj.JavacallHtml()" />
		<br>
		<br>
	<br>
		<input id="id_input2" style="width: 90%" type="text" value="null" />
		<br>
		<input type="button" value="JavacallHtml2" onclick="window.jsObj.JavacallHtml2()" />
</body>
		</html>