<uses-permission android:name="android.permission.INTERNET"></uses-permission>
WebView webview = (WebView)findViewById(R.id.vew);webview.getSettings().setJavaScriptEnabled(true);webview.loadUrl("http://www.baidu.com");
webview.setWebViewClient(new WebViewClient(){public boolean shouldOverrideUrlLoading(WebView view, String url) {view.loadUrl(url);return true;}});
public boolean onKeyDown(int keyCode, KeyEvent event) {if ((keyCode == KeyEvent.KEYCODE_BACK) && webview.canGoBack()) {webview.goBack();return true;}return super.onKeyDown(keyCode, event);}
<!doctype html><html><head><meta charset="utf-8"><title>demo</title><script>function wave(){document.getElementById(‘button‘).value = ‘aaaaaaa‘;}</script></head><body><input type="button" id="button" value="点我试试看" onClick="alert(1);window.demo.clickOnAndroid()" /></body></html>
WebView webview;private Handler mHandler = new Handler();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);webview = (WebView)findViewById(R.id.vew);webview.getSettings().setJavaScriptEnabled(true);webview.setWebViewClient(new WebViewClient(){public boolean shouldOverrideUrlLoading(WebView view, String url) {view.loadUrl(url);return true;}});webview.addJavascriptInterface(new androidclick() , "demo");webview.loadUrl("file:///android_asset/demo.html");}private final class androidclick{public void clickOnAndroid(){mHandler.post(new Runnable() {public void run() {webview.loadUrl("javascript:wave()");}});}}
原文：http://www.cnblogs.com/lzqbk/p/d7f0adba7b692e89ff837d179f4399a4.html