package?com.example.webview;

import?org.apache.http.client.entity.UrlEncodedFormEntity;

import?android.app.Activity;
import?android.app.ProgressDialog;
import?android.content.Intent;
import?android.net.Uri;
import?android.os.Bundle;
import?android.view.KeyEvent;
import?android.view.Menu;
import?android.view.MenuItem;
import?android.webkit.WebChromeClient;
import?android.webkit.WebSettings;
import?android.webkit.WebView;
import?android.webkit.WebViewClient;
import?android.widget.Toast;

public?class?MainActivity?extends?Activity?{

	private?String?url?=?"http://www.baibu.com/";
	private?WebView?webView;
	private?ProgressDialog?Dialog;

	@Override
	protected?void?onCreate(Bundle?savedInstanceState)?{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		//?Uri?uri?=?Uri.parse(url);
		//?Intent?intent?=?new?Intent(Intent.ACTION_VIEW,uri);
		//?startActivity(intent);
		init();
	}

	private?void?init()?{
		//?TODO?Auto-generated?method?stub
		webView?=?(WebView)?findViewById(R.id.webView);
		webView.loadUrl(url);
		webView.setWebViewClient(new?WebViewClient()?{

			public?boolean?shouldOverrideUrlLoading(WebView?view,?String?url)?{
				view.loadUrl(url);
				return?true;
			}
		});

		WebSettings?Settings?=?webView.getSettings();
		Settings.setJavaScriptEnabled(true);
		Settings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
		webView.setWebChromeClient(new?WebChromeClient()?{
			@Override
			public?void?onProgressChanged(WebView?view,?int?newProgress)?{
				//?TODO?Auto-generated?method?stub
				if?(newProgress?==?100)?{
					closeDialog();
				}?else?{
					openDialog(newProgress);
				}
				super.onProgressChanged(view,?newProgress);
			}

			private?void?closeDialog()?{
				//?TODO?Auto-generated?method?stub
				if?(Dialog?!=?null?&&?Dialog.isShowing())?{
					Dialog.dismiss();
					Dialog?=?null;
				}
			}

			private?void?openDialog(int?newProgress)?{
				//?TODO?Auto-generated?method?stub
				if?(Dialog?==?null)?{
					Dialog?=?new?ProgressDialog(MainActivity.this);
					Dialog.setTitle("正在加載");
					Dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
					Dialog.setProgress(newProgress);
					Dialog.show();
				}?else?{
					Dialog.setProgress(newProgress);
				}
			}

		});
	}

	//?改寫物理一次返回的按鍵的邏輯
	@Override
	public?boolean?onKeyDown(int?keyCode,?KeyEvent?event)?{
		//?TODO?Auto-generated?method?stub

		if?(keyCode?==?KeyEvent.KEYCODE_BACK)?{
			if?(webView.canGoBack())?{
				Toast.makeText(this,?webView.getUrl(),?Toast.LENGTH_SHORT)
						.show();

				webView.goBack();
				return?true;
			}?else?{
				System.exit(0);
			}
		}
		return?super.onKeyDown(keyCode,?event);
	}
}

這是我的，你看一下，是不是放錯位置了？或者其他的