/*** 先讲讲WebView常常要使用到的WebViewClient和WebChromeClient的区别：* WebViewClient主要帮助WebView处理各种通知、请求事件的，比如： onLoadResource，onPageStart，onPageFinish，onReceiveError，onReceivedHttpAuthRequest等* WebChromeClient主要辅助WebView处理Javascript的对话框、网站图标、网站title、加载进度等比如：onCloseWindow(关闭WebView)，onCreateWindow()，* onJsAlert (WebView上alert无效，需要定制WebChromeClient处理弹出)，onJsPrompt，onJsConfirm，onProgressChanged，onReceivedIcon，onReceivedTitle等* 如果WebView只是用来处理一些html的页面内容，只用WebViewClient就行了，如果需要更丰富的处理效果，比如JS、进度条等，，就要用到WebChromeClient。* 通常情况下您可以进行如下操作就可以了：WebView webView;webView= (WebView) findViewById(R.id.webview);//找到布局中的WebView控件webView.setWebChromeClient(new WebChromeClient());//使用默认的WebChromeClientwebView.setWebViewClient(new WebViewClient());//使用默认的WebViewClientwebView.getSettings().setJavaScriptEnabled(true);//设置可以与js交互webView.loadUrl(url);*/public class WebViewTestActivity extends Activity {/**WebView浏览器 */private WebView mWebView;/**进度条,增加用户体验度 */private ProgressDialog pdialog;/**重写返回按钮操作 */@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {/**条件是：点击返回按钮并且当前页面可以返回*/if (keyCode == KeyEvent.KEYCODE_BACK && mWebView.canGoBack()) {mWebView.goBack();return true;}return super.onKeyDown(keyCode, event);}@SuppressLint("SetJavaScriptEnabled")@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_webview_main);mWebView = (WebView) findViewById(R.id.test_webview);/**设置编码格式*/mWebView.getSettings().setDefaultTextEncodingName("UTF-8");/**设置为js可用*/mWebView.getSettings().setJavaScriptEnabled(true);/**滚动样式为无滚动条*/mWebView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);setListeners();showResults();}/**设置相应的监听 */private void setListeners() {/**设置url跳转到webview*/mWebView.setWebViewClient(new TestWebViewClient());/**js代码处理*/mWebView.setWebChromeClient(new TestWebChromClient());/**实现html与android交互*/mWebView.addJavascriptInterface(new ItestJs(), "aMe");}/**加载显示结果 */private void showResults() {pdialog = new ProgressDialog(this);mWebView.loadUrl("file:///android_asset/test_webview.html");}/**显示弹出对话框 */private void showAlertResult(String message) {AlertDialog.Builder builder = new AlertDialog.Builder(this);builder.setTitle("弹出对话框");builder.setMessage(message);builder.show();}/**对url跳转进行处理 */final class TestWebViewClient extends WebViewClient {@Overridepublic void onPageStarted(WebView view, String url, Bitmap favicon) {pdialog = ProgressDialog.show(WebViewTestActivity.this, null, "正在加载…");super.onPageStarted(view, url, favicon);}/**加载结束，关闭进度框*/@Overridepublic void onPageFinished(WebView view, String url) {pdialog.dismiss();super.onPageFinished(view, url);}@Overridepublic void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {super.onReceivedError(view, errorCode, description, failingUrl);}}/**处理javascript*/final class TestWebChromClient extends WebChromeClient {@Overridepublic boolean onJsAlert(WebView view, String url, String message, JsResult result) {super.onJsAlert(view, url, message, result);if (!message.equals("")) {showAlertResult(message);result.cancel();return true;}return super.onJsAlert(view, url, message, result);}@Overridepublic boolean onJsConfirm(WebView view, String url, String message, JsResult result) {return super.onJsConfirm(view, url, message, result);}@Overridepublic boolean onJsPrompt(WebView view, String url, String message, String defaultValue, JsPromptResult result) {return super.onJsPrompt(view, url, message, defaultValue, result);}}/**实现web与android交互 */final class ItestJs {private Handler handler = new Handler();private int flag = 0;public void onClick() {handler.post(new Runnable() {@Overridepublic void run() {if (flag == 0) {mWebView.loadUrl("javascript:changeImage01()");flag = 1;} else {mWebView.loadUrl("javascript:changeImage02()");flag = 0;}}});}}
}
—————————————————-对上面使用的一些资源的说明——————————-
在项目的assets目录下放有以下文件：
test_webview.js:
那风再温柔。太深的流连便成了一种羁绊，
