Android中webview的使用

Android客户端的代码：、

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.http.SslError;
import android.os.Bundle;
import android.os.Message;
import android.view.KeyEvent;
import android.view.View;
import android.view.Window;
import android.webkit.JsPromptResult;
import android.webkit.JsResult;
import android.webkit.SslErrorHandler;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

public class WebViewActivity extends Activity {

private WebView mWebView;
private String url;
private AlertDialog aDialog;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
this.getWindow().requestFeature(Window.FEATURE_PROGRESS);// 让窗体的上面显示进度条
this.getWindow().getDecorView()
.setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);// 隐藏导航按钮
setContentView(R.layout.webview);

mWebView = (WebView) findViewById(R.id.webView1);
aDialog = new AlertDialog.Builder(this).create();
Intent intent = getIntent();
url = intent.getStringExtra("id");
System.out.println("------WebViewActivity-------" + url);
WebSettings mWebSettings = mWebView.getSettings();
// 启用或禁止webview访问文件数据
mWebSettings.setAllowFileAccess(true);
// 是否显示网络图像
mWebSettings.setBlockNetworkImage(true);
// 设置是否支持缩放
mWebSettings.setBuiltInZoomControls(true);
// 设置缓冲的模式
// mWebSettings.setCacheMode();
// 设置默认的字体大小
mWebSettings.setDefaultFontSize(5);
// 设置在解码时使用的默认编码
mWebSettings.setDefaultTextEncodingName("utf-8");
// 设置是否支持JavaScript
mWebSettings.setJavaScriptEnabled(true);
// 设置用鼠标激活被选项
mWebSettings.setLightTouchEnabled(true);
// 设置是否支持变焦
mWebSettings.setSupportZoom(true);
mWebView.loadUrl(url);

// 设置webViewClient
mWebView.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// TODO Auto-generated method stub
view.loadUrl(url);
return true;
}

@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
// TODO Auto-generated method stub
super.onPageStarted(view, url, favicon);
}

@Override
public void onPageFinished(WebView view, String url) {
// TODO Auto-generated method stub
super.onPageFinished(view, url);
}

@Override
public void onReceivedError(WebView view, int errorCode,
String description, String failingUrl) {
// TODO Auto-generated method stub
super.onReceivedError(view, errorCode, description, failingUrl);
Toast.makeText(WebViewActivity.this, "page load error..",
Toast.LENGTH_SHORT).show();
aDialog.setTitle("ERROR");
aDialog.setMessage(description);
aDialog.setButton("OK", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub

}
});
aDialog.show();
}

@Override
public void onScaleChanged(WebView view, float oldScale,
float newScale) {
// TODO Auto-generated method stub
super.onScaleChanged(view, oldScale, newScale);
}

@Override
public void onReceivedSslError(WebView view,
SslErrorHandler handler, SslError error) {
// TODO Auto-generated method stub
super.onReceivedSslError(view, handler, error);
handler.cancel();
handler.proceed();
}
});

mWebView.setWebChromeClient(new WebChromeClient() {
@Override
public boolean onCreateWindow(WebView view, boolean isDialog,
boolean isUserGesture, Message resultMsg) {
// TODO Auto-generated method stub
return super.onCreateWindow(view, isDialog, isUserGesture,
resultMsg);
}

@Override
public boolean onJsAlert(WebView view, String url, String message,
JsResult result) {
// TODO Auto-generated method stub
return super.onJsAlert(view, url, message, result);
}

@Override
public boolean onJsConfirm(WebView view, String url,
String message, JsResult result) {
// TODO Auto-generated method stub
return super.onJsConfirm(view, url, message, result);
}

@Override
public boolean onJsPrompt(WebView view, String url, String message,
String defaultValue, JsPromptResult result) {
// TODO Auto-generated method stub
return super.onJsPrompt(view, url, message, defaultValue,
result);
}

@Override
public void onProgressChanged(WebView view, int newProgress) {
// TODO Auto-generated method stub
/*
* WebViewActivity.this.getWindow().setFeatureInt(
* Window.FEATURE_PROGRESS, newProgress * 100);
*/
super.onProgressChanged(view, newProgress);
setProgress(newProgress * 100);
}

@Override
public void onReceivedIcon(WebView view, Bitmap icon) {
// TODO Auto-generated method stub
super.onReceivedIcon(view, icon);
}

@Override
public void onReceivedTitle(WebView view, String title) {
// TODO Auto-generated method stub
WebViewActivity.this.setTitle(title);
super.onReceivedTitle(view, title);
}

@Override
public void onRequestFocus(WebView view) {
// TODO Auto-generated method stub
super.onRequestFocus(view);
}
});
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if ((keyCode == KeyEvent.KEYCODE_BACK) && mWebView.canGoBack()) {
// 返回前一个页面
mWebView.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
}

布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

</LinearLayout>

AndroidManifest.xml中加上访问网络的权限

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

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