android WebView 使用实例

主布局文件:

1<?xml version="1.0" encoding="utf-8"?>
2<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3    android:layout_width="match_parent"
4    android:layout_height="match_parent"
5    android:orientation="vertical" >
6    <LinearLayout android:orientation="horizontal"
7        android:layout_width="fill_parent"
8        android:layout_height="wrap_content">
9        <Button android:layout_width="wrap_content"
10            android:layout_height="wrap_content"
11            android:id="@+id/bt_back"
12            android:text="后退"/>
13        <Button android:layout_width="wrap_content"
14            android:layout_height="wrap_content"
15            android:id="@+id/bt_forward"
16            android:text="前进"/>
17        <EditText android:layout_width="150px"
18            android:layout_height="wrap_content"
19            android:id="@+id/ed_url"
20            android:singleLine="true"
21            android:hint="请输入网址"/>
22        <Button android:layout_width="fill_parent"
23            android:layout_height="wrap_content"
24            android:id="@+id/bt_go"
25            android:text="GO"/>
26    </LinearLayout>
27	<WebView android:layout_width="fill_parent"
28	    android:layout_height="fill_parent"
29	    android:id="@+id/webview"/>
30</LinearLayout>

主活动类WebViewMainActivity.java：

1package com.example.ch10;
2
3import com.example.baseexample.R;
4
5import android.app.Activity;
6import android.os.Bundle;
7import android.view.KeyEvent;
8import android.view.View;
9import android.view.Window;
10import android.webkit.URLUtil;
11import android.webkit.WebChromeClient;
12import android.webkit.WebSettings;
13import android.webkit.WebView;
14import android.webkit.WebViewClient;
15import android.widget.Button;
16import android.widget.EditText;
17import android.widget.Toast;
18
19public class WebViewMainActivity extends Activity {
20	private WebView webview ;
21	private Button bt_back,bt_forward,bt_go;
22	private EditText ed_url;
23	
24	public void onCreate(Bundle savedInstanceState){
25		super.onCreate(savedInstanceState);
26		setContentView(R.layout.ch10webviewmain);
27		
28		webview = (WebView)findViewById(R.id.webview);
29		ed_url = (EditText)findViewById(R.id.ed_url);
30		bt_back = (Button)findViewById(R.id.bt_back);
31		bt_forward = (Button)findViewById(R.id.bt_forward);
32		bt_go = (Button)findViewById(R.id.bt_go);
33		
34		WebSettings webSettings = webview.getSettings();
35		webSettings.setBuiltInZoomControls(true);
36		webSettings.setDefaultFontSize(9);
37		webSettings.setAllowFileAccess(true);
38		webview.setWebViewClient(new WebViewClient(){
39			public boolean shouldOverrideUrlLoading(WebView view,String url){
40				view.loadUrl(url);
41				return true;
42			}
43		});
44		
45		webview.setWebChromeClient(new WebChromeClient(){
46			public void onReceivedTitle(WebView view,String title){
47				WebViewMainActivity.this.setTitle(title);
48				super.onReceivedTitle(view, title);
49			}
50			public void onProgressChanged(WebView view,int newProgress){
51				WebViewMainActivity.this.getWindow().setFeatureInt(Window.FEATURE_PROGRESS, newProgress*100);
52				super.onProgressChanged(view, newProgress);
53			}
54		});
55		
56		bt_go.setOnClickListener(new Button.OnClickListener(){
57
58			@Override
59			public void onClick(View v) {
60				String url = ed_url.getText().toString().trim();
61				if(URLUtil.isNetworkUrl(url)){
62					webview.loadUrl(url);
63				}else{
64					Toast.makeText(WebViewMainActivity.this, "网址错误", Toast.LENGTH_LONG).show();
65				}
66			}
67			
68		});
69		
70		bt_back.setOnClickListener(new Button.OnClickListener(){
71
72			@Override
73			public void onClick(View arg0) {
74				if(webview.canGoBack()){
75					webview.goBack();
76				}
77			}
78			
79		});
80		
81		bt_forward.setOnClickListener(new Button.OnClickListener(){
82
83			@Override
84			public void onClick(View arg0) {
85				
86				if(webview.canGoForward()){
87					webview.goForward();
88				}
89			}
90			
91		});
92		
93	}
94	
95	public boolean onKeyDown(int keyCode,KeyEvent event){
96		if((keyCode==KeyEvent.KEYCODE_BACK) && webview.canGoBack()){
97			webview.goBack();
98			return true;
99		}else if(keyCode==KeyEvent.KEYCODE_BACK){
100			return super.onKeyDown(keyCode, event);
101		}
102		return false;
103	}
104
105}