Android WebView

package com.xuefei.webview;

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

public class MainActivity extends Activity {

	private WebView mWebView;

	@SuppressLint("SetJavaScriptEnabled")
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		mWebView = new WebView(this);
		mWebView.getSettings().setJavaScriptEnabled(true);
		mWebView.loadUrl("http://www.baidu.com/");
		setContentView(mWebView);

		mWebView.setWebViewClient(new WebViewClient() {
			@Override
			public boolean shouldOverrideUrlLoading(WebView view, String url) {
				// 在当前的webview中跳转到新的url
				view.loadUrl(url);

				return true;
			}
		});
	}

	@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);
	}

	@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) && mWebView.canGoBack()) {
			// goBack()表示返回WebView的上一页面
			mWebView.goBack();
			return true;
		}
		return false;
	}
}