10.3.3 WebView的几个常见功能

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" ???android:orientation="vertical" ???android:layout_width="fill_parent" ???android:layout_height="fill_parent" > ???<WebView ???????android:id="@+id/webview" ???????android:layout_width="fill_parent" ???????android:layout_height="fill_parent"/></LinearLayout>

package com.example.progresstest;import android.os.Bundle;import android.app.Activity;import android.app.AlertDialog;import android.app.ProgressDialog;import android.content.DialogInterface;import android.view.KeyEvent;import android.view.Menu;import android.view.View;import android.webkit.WebView;import android.webkit.WebViewClient;import android.widget.ProgressBar;import android.widget.Toast;public class WebViewActivity extends Activity { ???private ProgressDialog progressBar; ???private WebView webView; ???private AlertDialog alertDialog; ???@Override ???protected void onCreate(Bundle savedInstanceState) { ???????super.onCreate(savedInstanceState); ???????setContentView(R.layout.webview); ???????//加载WebView ???????initWebView(); ???} ???private void initWebView() { ???????progressBar = ProgressDialog.show(WebViewActivity.this, null, "正在进入网页,请稍后...."); ???????//获得WebView组件 ???????webView = (WebView) this.findViewById(R.id.webview); ???????webView.getSettings().setJavaScriptEnabled(true); ???????webView.loadUrl("http://www.google.com"); ???????alertDialog = new AlertDialog.Builder(this).create(); ???????//设置视图客户端 ???????webView.setWebViewClient(new MyWebViewCLient()); ???} ??@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) { ???// TODO Auto-generated method stub ??????if(keyCode == KeyEvent.KEYCODE_BACK && webView.canGoBack()){ ??????????webView.goBack(); ??????????return true; ??????} ???return super.onKeyDown(keyCode, event);}/* ???@Override ???public boolean onCreateOptionsMenu(Menu menu) { ???????// Inflate the menu; this adds items to the action bar if it is present. ???????getMenuInflater().inflate(R.menu.main, menu); ???????return true; ???}*/ ???class MyWebViewCLient extends WebViewClient { ????????????@Override ???????????public boolean shouldOverrideUrlLoading(WebView view, String url) { ???????????????// TODO Auto-generated method stub ????????????????view.loadUrl(url); ???????????????return true; ???????????} ????????????@Override ???????????public void onPageFinished(WebView view, String url) { ???????????// TODO Auto-generated method stub ??????????????if(progressBar.isShowing()){ ??????????????????progressBar.dismiss(); ??????????????} ???????????} ????????????@Override ???????????public void onReceivedError(WebView view, int errorCode, ???????????String description, String failingUrl) { ???????????// TODO Auto-generated method stub ???????????Toast.makeText(WebViewActivity.this, "网页加载出错! ?", Toast.LENGTH_LONG); ???????????alertDialog.setTitle("ERROR"); ???????????alertDialog.setMessage(description); ???????????alertDialog.setButton("OK", new DialogInterface.OnClickListener() { ???????????????????????????????@Override ???????????????public void onClick(DialogInterface dialog, int which) { ???????????????????// TODO Auto-generated method stub ???????????????????????????????????} ???????????}); ???????????alertDialog.show(); ????????????} ???}}

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" ???package="com.example.progresstest" ???android:versionCode="1" ???android:versionName="1.0" > ???<uses-sdk ???????android:minSdkVersion="8" ???????android:targetSdkVersion="17" /> ???<application ???????android:allowBackup="true" ???????android:icon="@drawable/ic_launcher" ???????android:label="@string/app_name" ???????android:theme="@style/AppTheme" > ???????<activity ???????????android:name="com.example.progresstest.WebViewActivity" ???????????android:label="@string/app_name" > ???????????<intent-filter> ???????????????<action android:name="android.intent.action.MAIN" /> ???????????????<category android:name="android.intent.category.LAUNCHER" /> ???????????</intent-filter> ???????</activity> ???</application><uses-permission android:name="android.permission.INTERNET"/></manifest>