下面是webview常规的用法：
import android.annotation.SuppressLint;
import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.webkit.JavascriptInterface;import android.webkit.JsResult;import android.webkit.WebSettings;import android.webkit.WebView;import android.webkit.WebViewClient;public class MainActivity extends Activity {
//在Android 4.3系统及其一下WebView内部采用Webkit渲染引擎，在Android 4.4采用chromium 渲染引擎来渲染View的内容。 //别忘记，在androidMainFest.xml中添加网络权限 //<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> //<uses-permission android:name="android.permission.INTERNET" /> //<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> WebView test_wb; JSUtil jsUtil;@SuppressLint("SetJavaScriptEnabled")
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //原生和webview交互的类 jsUtil = new JSUtil(); //xml布局页面中定义 test_wb=(WebView)findViewById(R.id.test_wb); //清理 //wv.clearCache(true); //wv.clearHistory(); //wv.clearFormData(); //设置webview属性 WebSettings ws=test_wb.getSettings(); //一般都会设置支持js ws.setJavaScriptEnabled(true); //默认编码格式 ws.setDefaultTextEncodingName("UTF-8"); //设置页面自适应 ws.setUseWideViewPort(true); //设置缓存模式 ws.setCacheMode(WebSettings.LOAD_NO_CACHE); //……………………//获取焦点
test_wb.requestFocus(); //注入webview对象 test_wb.addJavascriptInterface(jsUtil, "local_obj");//jsUtil对象类方法中添加了@JavascriptInterface标注,通过"window.local_obj.方法名"调用 //加载网页 test_wb.loadUrl("http://www.zjtax.net"); //加载本地地址,file://android_asset/test.html // test_wb.loadUrl("file:///android_asset/test.html");----------------这里是file:/// 3个/线哦 //执行js,javascript:alert() // test_wb.loadUrl("javascript:alert('ok')"); //主要处理解析，渲染网页等浏览器做的事情 //若不重写webviewclient的shouldOverrideUrlLoading方法，加载网页会默认用外部的浏览器打开// test_wb.setWebViewClient(new WebViewClient() { @Override public boolean shouldOverrideUrlLoading(WebView wb,String url) { test_wb.loadUrl(url); return true;//表示手动处理，若没有loadUrl(url)页面不会跳转。 //return false;//若不想手动处理，直接用webview自动处理，可以直接返回false. //return super.shouldOverrideUrlLoading(wb, url); } //页面开始请求 @Override public void onPageStarted(WebView view, String url, Bitmap favicon) { // TODO Auto-generated method stub super.onPageStarted(view, url, favicon); }//页面请求结束 @Override public void onPageFinished(WebView view, String url) { // TODO Auto-generated method stub super.onPageFinished(view, url); }
//页面有错误 @Override public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) { // TODO Auto-generated method stub super.onReceivedError(view, errorCode, description, failingUrl); } } );
//是辅助WebView处理Javascript的对话框，网站图标，网站title，加载进度等 //重写处理网页的alert,confirm,Prompt ,Window,Progress test_wb.setWebChromeClient(new WebChromeClient() { //进度条 @Override public void onProgressChanged(WebView view, int newProgress) { pb.setProgress(newProgress); if(newProgress==100){ pb.setVisibility(View.GONE); } } //网站标题 @Override public void onReceivedTitle(WebView view, String title) { // TODO Auto-generated method stub super.onReceivedTitle(view, title); }
//网站图标 @Override public void onReceivedTouchIconUrl(WebView view, String url, boolean precomposed) { // TODO Auto-generated method stub super.onReceivedTouchIconUrl(view, url, precomposed); }
//窗体 @Override public boolean onCreateWindow(WebView view, boolean isDialog, boolean isUserGesture, Message resultMsg) { // TODO Auto-generated method stub return super.onCreateWindow(view, isDialog, isUserGesture, resultMsg); } @Override public boolean onJsBeforeUnload(WebView view, String url, String message, JsResult result) { return super.onJsBeforeUnload(view, url, message, result); } /** * 覆盖默认的window.alert展示界面，避免title里显示为“：来自file:” */ public boolean onJsAlert(WebView view, String url, String message, JsResult result) { final AlertDialog.Builder builder = new AlertDialog.Builder(view.getContext()); builder.setTitle("对话框") .setMessage(message) .setPositiveButton("确定", null); // 不需要绑定按键事件 // 屏蔽keycode等于84之类的按键 builder.setOnKeyListener(new OnKeyListener() { public boolean onKey(DialogInterface dialog, int keyCode,KeyEvent event) { Log.v("onJsAlert", "keyCode==" + keyCode + "event="+ event); return true; } }); // 禁止响应按back键的事件 builder.setCancelable(false); AlertDialog dialog = builder.create(); dialog.show(); result.confirm();// 因为没有绑定事件，需要强行confirm,否则页面会变黑显示不了内容。 return true; // return super.onJsAlert(view, url, message, result); } /** * 覆盖默认的window.confirm展示界面，避免title里显示为“：来自file:” */ public boolean onJsConfirm(WebView view, String url, String message, final JsResult result) { final AlertDialog.Builder builder = new AlertDialog.Builder(view.getContext()); builder.setTitle("对话框") .setMessage(message) .setPositiveButton("确定",new OnClickListener() { public void onClick(DialogInterface dialog,int which) { result.confirm(); } }) .setNeutralButton("取消", new OnClickListener() { public void onClick(DialogInterface dialog, int which) { result.cancel(); } }); builder.setOnCancelListener(new OnCancelListener() { @Override public void onCancel(DialogInterface dialog) { result.cancel(); } }); // 屏蔽keycode等于84之类的按键，避免按键后导致对话框消息而页面无法再弹出对话框的问题 builder.setOnKeyListener(new OnKeyListener() { @Override public boolean onKey(DialogInterface dialog, int keyCode,KeyEvent event) { Log.v("onJsConfirm", "keyCode==" + keyCode + "event="+ event); return true; } }); // 禁止响应按back键的事件 // builder.setCancelable(false); AlertDialog dialog = builder.create(); dialog.show(); return true; // return super.onJsConfirm(view, url, message, result); } /** * 覆盖默认的window.prompt展示界面，避免title里显示为“：来自file:” * window.prompt('请输入您的域名地址', '618119.com'); */ public boolean onJsPrompt(WebView view, String url, String message, String defaultValue, final JsPromptResult result) { final AlertDialog.Builder builder = new AlertDialog.Builder(view.getContext()); builder.setTitle("对话框").setMessage(message); final EditText et = new EditText(view.getContext()); et.setSingleLine(); et.setText(defaultValue); builder.setView(et) .setPositiveButton("确定", new OnClickListener() { public void onClick(DialogInterface dialog, int which) { result.confirm(et.getText().toString()); } }) .setNeutralButton("取消", new OnClickListener() { public void onClick(DialogInterface dialog, int which) { result.cancel(); } }); // 屏蔽keycode等于84之类的按键，避免按键后导致对话框消息而页面无法再弹出对话框的问题 builder.setOnKeyListener(new OnKeyListener() { public boolean onKey(DialogInterface dialog, int keyCode,KeyEvent event) { Log.v("onJsPrompt", "keyCode==" + keyCode + "event="+ event); return true; } }); // 禁止响应按back键的事件 // builder.setCancelable(false); AlertDialog dialog = builder.create(); dialog.show(); return true; // return super.onJsPrompt(view, url, message, defaultValue, // result); } }); }}