android WebView 简单使用Demo

package com.example.mybrowser;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.EditText;

public class MainActivity extends Activity {
    private static final String URL ="http://www.baidu.com";
    private EditText et_address;
    private WebView myWebView;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        
        et_address = (EditText) findViewById(R.id.et_address);
        myWebView = (WebView) findViewById(R.id.myWebView);
         WebSettings mysettings = myWebView.getSettings();
         mysettings.setSupportZoom(true);
         mysettings.setBuiltInZoomControls(true);
         myWebView.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);
        menu.addSubMenu(0,0,0,"刷新");
        menu.addSubMenu(0,0,1,"前进");
        menu.addSubMenu(0,0,2,"后退");
        return true;
    }
    
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // TODO Auto-generated method stub
        
        switch (item.getOrder()) {
        case 0:
            myWebView.reload();
            break;

        case 1:
            if(myWebView.canGoBack()){
                myWebView.goBack();
            }
            else
            {
                
            }
            break;
        case 2:
    
            if(myWebView.canGoForward()){
                myWebView.goForward();
            }
            break;
        }
        return true;
    }

    
    public void click(View v){
        String url = et_address .getText().toString().trim();
        if(url == null || url.isEmpty()){
            url =URL;
        }
        myWebView.loadUrl(url);
    }
}