安卓加载网页

阅读更多 package com.example.webview;

import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.view.KeyEvent;
import android.view.Menu;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class MainActivity extends Activity
{

    private WebView webview;
    @SuppressLint("SetJavaScriptEnabled")
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        webview = (WebView) findViewById(R.id.webview);
        WebSettings webSettings = webview.getSettings();
        //设置WebView属性，能够执行Javascript脚本
        webSettings.setJavaScriptEnabled(true);
        //设置可以访问文件
        webSettings.setAllowFileAccess(true);
         //设置支持缩放
        webSettings.setBuiltInZoomControls(true);
        //加载需要显示的网页
        webview.loadUrl("http://www.baidu.com");
        //设置Web视图
        webview.setWebViewClient(new webViewClient ());

    }


    @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
    //设置回退
    //覆盖Activity类的onKeyDown(int keyCoder,KeyEvent event)方法
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if ((keyCode == KeyEvent.KEYCODE_BACK) && webview.canGoBack()) {
            webview.goBack(); //goBack()表示返回WebView的上一页面
            return true;
        }
        finish();//结束退出程序
        return false;
    }

    //Web视图
    private class webViewClient extends WebViewClient {
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            view.loadUrl(url);
            return true;
        }
    }

}

xml 代码
<?xml version="1.0" encoding="utf-8"?>
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
            android:id="@+id/webview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        />

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