使用WebView显示网页

package com.example.webtest;

import java.security.PublicKey;

import android.support.v7.app.ActionBarActivity;
import android.app.Activity;
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.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;

public class MainActivity extends Activity {
private String url = "http://2014.qq.com/";
private ProgressDialog progressDialog;
private WebView web;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.web);
web = (WebView) findViewById(R.id.web);
// Uri uri = Uri.parse(url);
// URL:统一资源定位符 也就是网址 例如 http://www.microsoft.com/
// URI:通用资源标志符 http://www.acme.com/support/suppliers.htm
// Intent intent = new Intent(Intent.ACTION_VIEW, uri);
// startActivity(intent);
init();

/*
* Uri uri = Uri.parse(url); // url为你要的链接 Intent intent = new
* Intent(Intent.ACTION_VIEW, uri); startActivity(intent);
*/

}

private void init() {
// TODO Auto-generated method stub

// Log.d("tag", "DAYIN");
web.loadUrl(url);
// web.loadUrl("file:///android_asset/1.html");
web.setWebViewClient(new WebViewClient() {

// 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
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// TODO Auto-generated method stub
view.loadUrl(url);

// 返回值是TRUE的时候控制网页在webview中打开，如果为false的时候则调用系统浏览器或者第三方浏览器打开
return super.shouldOverrideUrlLoading(view, url);
}
});

// Webviewclient帮助webview去处理一些页面控制和请求通知。
WebSettings settings = web.getSettings();
settings.setJavaScriptEnabled(true);// 使得手机自动适应网页

settings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK); // webvie加载页面优先使用缓存加载
web.setWebChromeClient(new WebChromeClient() {
@Override
public void onProgressChanged(WebView view, int newProgress) {
// TODO Auto-generated method stub
super.onProgressChanged(view, newProgress);

if (newProgress == 100) {
// 网页加载完毕， 关闭progressDialog
closeDialog();
} else {
openDialog(newProgress);
}

}

private void openDialog(int newProgress) {
// TODO Auto-generated method stub

if (progressDialog == null) {
progressDialog = new ProgressDialog(MainActivity.this);
progressDialog.setTitle("正在加载中");
progressDialog
.setProgressStyle(progressDialog.STYLE_HORIZONTAL);
progressDialog.setProgress(newProgress);
progressDialog.show();

} else {
progressDialog.setProgress(newProgress);// 显示新的进度
}
}

private void closeDialog() {
// TODO Auto-generated method stub
if (progressDialog != null && progressDialog.isShowing()) {
progressDialog.dismiss();// 取消显示
progressDialog = null;

}
}
});

}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {

// 改写物理按键--返回的逻辑
// TODO Auto-generated method stub
if (keyCode == KeyEvent.KEYCODE_BACK) {
if (web.canGoBack()) {
web.goBack();
return true;// 在javaScript里，return有终止函数的执行和传递数值，两种功能。
// return false 就是返回假值，从而终止了函数的执行
// return true 就是返回真值，从而传递数值，继续执行函数
} else {
System.exit(0);
}

}
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;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <WebView 
        android:id="@+id/web"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</LinearLayout>