迷你浏览器——WebView学习

MiniBrowser.java

public class MiniBrowser extends Activity {

	EditText url;
	WebView showWebView;
	Button searchButton;
	String urlStr = null;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		url = (EditText) findViewById(R.id.url);
		showWebView = (WebView) findViewById(R.id.show);		
		searchButton = (Button) findViewById(R.id.searchButton);
		
		//真机测试时，保证在当前的Activity显示页面，而非自带浏览器显示
		showWebView.setWebViewClient(new WebViewClient(){
			@Override
			public boolean shouldOverrideUrlLoading(WebView view, String url) {
				// TODO Auto-generated method stub
				//用WebView 载入页面
				view.loadUrl(url);
				return true;
			}
		});	
		
		//enable JavaScript 
		showWebView.getSettings().setJavaScriptEnabled(true);
		
		searchButton.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				urlStr = url.getText().toString();
				showWebView.loadUrl(urlStr);
				
			}
		});
				
	}
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		// TODO Auto-generated method stub
		//按后退键可以跳到上级页面
		if(keyCode == KeyEvent.KEYCODE_BACK){
			showWebView.goBack();
			return true;
		}
		return super.onKeyDown(keyCode, event);
	}
	
}

<RelativeLayout  xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    tools:context=".MiniBrowser" >

    <EditText 
        android:id="@+id/url"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:singleLine="true"
        android:layout_toLeftOf="@+id/searchButton"
        android:layout_alignTop="@+id/searchButton"
        android:layout_alignBottom="@+id/searchButton" />

    <Button
        android:id="@+id/searchButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:text="@string/search" />

   
	<WebView 
	    android:id="@+id/show"
	    android:layout_width="fill_parent"
	    android:layout_height="fill_parent"
	    android:layout_below="@id/searchButton"/>
 </RelativeLayout>

<uses-permission android:name="android.permission.INTERNET"/>