使用webview显示网页

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activity_main.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="webviewtest.yweizheng.com.webviewtest.MainActivity">    <WebView        android:id="@+id/webView"        android:layout_width="fill_parent"        android:layout_height="fill_parent" /></RelativeLayout>

package com.imooc.android_webview;import android.app.Activity;import android.app.ActionBar;import android.app.Fragment;import android.app.ProgressDialog;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.util.Log;import android.view.KeyEvent;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.webkit.WebChromeClient;import android.webkit.WebSettings;import android.webkit.WebView;import android.webkit.WebViewClient;import android.widget.Toast;import android.os.Build;public class MainActivity extends Activity {    private String url = "http://2014.qq.com/";    private WebView webView;    private ProgressDialog dialog;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.web);        // Uri uri = Uri.parse(url); //url为你要链接的地址        // Intent intent =new Intent(Intent.ACTION_VIEW, uri);        // startActivity(intent);        init();    }    private void init() {        // TODO Auto-generated method stub        webView = (WebView) findViewById(R.id.webView);        // WebView加载本地资源        // webView.loadUrl("file:///android_asset/example.html");        // WebView加载web资源        webView.loadUrl(url);        // 覆盖WebView默认通过第三方或者是系统浏览器打开网页的行为，使得网页可以在WebVIew中打开        webView.setWebViewClient(new WebViewClient(){            @Override            public boolean shouldOverrideUrlLoading(WebView view, String url) {                // TODO Auto-generated method stub                //返回值是true的时候控制网页在WebView中去打开，如果为false调用系统浏览器或第三方浏览器去打开                view.loadUrl(url);                return true;            }            //WebViewClient帮助WebView去处理一些页面控制和请求通知        });        //启用支持JavaScript        WebSettings settings = webView.getSettings();        settings.setJavaScriptEnabled(true);        //WebView加载页面优先使用缓存加载        settings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);        webView.setWebChromeClient(new WebChromeClient(){            @Override            public void onProgressChanged(WebView view, int newProgress) {                // TODO Auto-generated method stub                //newProgress 1-100之间的整数                if(newProgress==100)                {                    //网页加载完毕，关闭ProgressDialog                    closeDialog();                }                else                {                    //网页正在加载,打开ProgressDialog                    openDialog(newProgress);                }            }            private void closeDialog() {                // TODO Auto-generated method stub                  if(dialog!=null&&dialog.isShowing())                  {                         dialog.dismiss();                         dialog=null;                  }            }            private void openDialog(int newProgress) {                // TODO Auto-generated method stub                if(dialog==null)                {                    dialog=new ProgressDialog(MainActivity.this);                    dialog.setTitle("正在加载");                    dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);                    dialog.setProgress(newProgress);                    dialog.show();                }                else                {                    dialog.setProgress(newProgress);                }            }        });    }    //改写物理按键——返回的逻辑    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {        // TODO Auto-generated method stub        if(keyCode==KeyEvent.KEYCODE_BACK)        {            //Toast.makeText(this, webView.getUrl(), Toast.LENGTH_SHORT).show();            if(webView.canGoBack())            {                webView.goBack();//返回上一页面                return true;            }            else            {                System.exit(0);//退出程序            }        }        return super.onKeyDown(keyCode, event);    }}

AndroidMainfest.xml

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