使用WebView显示网页

简单的页面跳转

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);
	}
}

web.xml文件

<?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>