android webview与 js交互通信

package cn.com.web; import cn.com.web.R; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.graphics.Bitmap; import android.os.Bundle; import android.view.KeyEvent; import android.view.MotionEvent; import android.view.View; import android.view.Window; import android.view.View.OnTouchListener; import android.webkit.WebChromeClient; import android.webkit.WebView; import android.webkit.WebViewClient; import android.widget.EditText; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; import android.widget.Toast; /** * 浏览器 * */ public class WebViewApp extends Activity { /** webview控件 */ private WebView webView; /** 当前url地址 */ private String browserUrl = "file:///android_asset/error.html"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); // getWindow().requestFeature(Window.FEATURE_PROGRESS);// 用title bar做进度条 // requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);// 用title setContentView(R.layout.browser_layout); initWebView(); } /** * 初始化webview */ private void initWebView() { // 得到webView的引用 webView = (WebView) findViewById(R.id.browser_layout_webview); // 支持JavaScript webView.getSettings().setJavaScriptEnabled(true); // 支持缩放 webView.getSettings().setBuiltInZoomControls(true); // 支持保存数据 webView.getSettings().setSaveFormData(false); // 清除缓存 webView.clearCache(true); // 清除历史记录 webView.clearHistory(); // 联网载入 webView.loadUrl(browserUrl); // String baseUrl = "file:///android_asset"; // webView.loadDataWithBaseURL(baseUrl, browserUrl, "text/html", // "utf-8", null); // 设置 webView.setWebViewClient(new WebViewClient() { /** 开始载入页面 */ @Override public void onPageStarted(WebView view, String url, Bitmap favicon) { setProgressBarIndeterminateVisibility(true);// 设置标题栏的滚动条开始 browserUrl = url; super.onPageStarted(view, url, favicon); } /** 捕获点击事件 */ public boolean shouldOverrideUrlLoading(WebView view, String url) { webView.loadUrl(url); return true; } /** 错误返回 */ @Override public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) { super.onReceivedError(view, errorCode, description, failingUrl); } /** 页面载入完毕 */ @Override public void onPageFinished(WebView view, String url) { setProgressBarIndeterminateVisibility(false);// 设置标题栏的滚动条停止 super.onPageFinished(view, url); } }); webView.setWebChromeClient(new WebChromeClient() { /** 设置进度条 */ public void onProgressChanged(WebView view, int newProgress) { // 设置标题栏的进度条的百分比 WebViewApp.this.getWindow().setFeatureInt( Window.FEATURE_PROGRESS, newProgress * 100); super.onProgressChanged(view, newProgress); } /** 设置标题 */ public void onReceivedTitle(WebView view, String title) { WebViewApp.this.setTitle(title); super.onReceivedTitle(view, title); } }); webView.addJavascriptInterface(new RemoteInvokeService(WebViewApp.this, webView, "http://www.baidu.com/"), "js_invoke"); } /** * 捕获返回键 */ public boolean onKeyDown(int keyCode, KeyEvent event) { if ((keyCode == KeyEvent.KEYCODE_BACK && webView.canGoBack())) { webView.goBack(); return true; } return super.onKeyDown(keyCode, event); } }