Paypal-Express Checkout快捷支付方式的android端开发心得（二）

一、前导

上一篇讲的不是非常好，这里再又一次讲一下。

Paypal手机支付有2种形式：

1.Mobile Express Checkout，MEC，快捷支付

2.MPL

假设採用MEC支付方式，这样的方式点击Checkoutbutton之后的页面一直到付款结束都是url的形式，必须先有Web网站的支付，所以仅仅能通过WebView的形式进行记载,使用起来和Web网站效果一样,假设载入的页面中有些内容不想显示，能够隐藏。

二、MEC支付案例

package com.sound.chinabuye.activity;

import http.HttpUrls;

import java.util.List;

import org.apache.http.cookie.Cookie;

import tool.NewTokenCallBack;
import tool.TokenTools;
import tool.UserInfo;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.webkit.CookieManager;
import android.webkit.CookieSyncManager;
import android.webkit.JsResult;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

import com.sound.chinabuye.R;
import com.sound.chinabuye.bean.BroadAction;

public class CheckoutActivity2 extends Activity {
	public static final String TAG = "CheckoutActivity2";
	private WebView webView;
	private List<Cookie> cookies;
	private ProgressDialog dialog;
	

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		manageActivity();
		webView = new WebView(this);
		webView.setWebViewClient(new MyWebViewClient());
		webView.setWebChromeClient(new MyChromeClient());
		WebSettings webSettings = webView.getSettings();
		webSettings.setJavaScriptEnabled(true);
		webSettings.setUseWideViewPort(false);
		webSettings.setSupportZoom(false);

		setContentView(webView);
		dialog = new ProgressDialog(this);
		dialog.setMessage(getString(R.string.loading));
		dialog.setCancelable(false);
		// 请求获得cookies
		requestData();
	}

	private void requestData() {
		TokenTools.requestNewToken(CheckoutActivity2.this, new NewTokenCallBack() {

			@Override
			public void getNewTokenSuccess(String newAccessToken) {
				if (newAccessToken != null) {
					String customerid = UserInfo.getUserInfoInstance().getUserid();
					String url = "http://www.chinabuye.com/service/product/listcartweb" + "?productid=64396&qty=1&customerid=" + customerid + "&ACCESSTOKEN=" + newAccessToken;
					webView.loadUrl(url);
				}
			}
		});
	}

	@Override
	protected void onDestroy() {
		super.onDestroy();
		CookieSyncManager.createInstance(CheckoutActivity2.this);
		CookieManager cookieManager = CookieManager.getInstance();
		cookieManager.removeAllCookie();
		CookieSyncManager.getInstance().sync();
	}

	private void setCookiesVia2Url(String fromUrl, String toUrl) {
		CookieSyncManager.createInstance(CheckoutActivity2.this);
		CookieManager cookieManager = CookieManager.getInstance();
		String value = cookieManager.getCookie(fromUrl);
		cookieManager.setCookie(toUrl, value);
		CookieSyncManager.getInstance().sync();
	}

	private void manageActivity() {
		ActivityInstanceManager.getActivityInstanceManager().addActivity(this);
	}

	private class MyWebViewClient extends WebViewClient {
		private String currentUrl;

		@Override
		public void onPageStarted(WebView view, String url, Bitmap favicon) {
			Log.e(TAG, "start:" + url);
			currentUrl = url;
			// 開始跳转Paypal登录界面
			if (url.contains("http://www.chinabuye.com/service/product/listcartweb")) {
				dialog.show();
			}
			// 開始载入Place Order，包括从其它页面返回的情况和開始提交订单的情况
			if (url.contains("http://www.chinabuye.com/m/paypal/express/saveOrder") || url.contains("PayerID") || url.contains("http://www.chinabuye.com/m/paypal/express/review")) {
				if (dialog.isShowing()) {
					dialog.dismiss();
				}
				dialog.show();
			}
			// 開始载入 下单成功的界面
			if (url.contains("http://www.chinabuye.com/m/checkout/onepage/success")) {
				dialog.show();
			}
			super.onPageStarted(view, url, favicon);
		}

		@Override
		public boolean shouldOverrideUrlLoading(WebView view, String url) {
			Log.e(TAG, "load:" + url);
			/** 这里不做不论什么拦截操作 ***/
			// view.loadUrl(url);
			// return true;
			return super.shouldOverrideUrlLoading(view, url);
		}

		@Override
		public void onPageFinished(WebView view, String url) {
			Log.e(TAG, "finish:" + url);
			if (url.contains("customerid")) {
				String url2 = "http://www.chinabuye.com/m/checkout/cart";// 这个直接使用Web购物车，測试没问题
				String url3 = "http://www.chinabuye.com/paypal/express/shortcut";// 这个直接拦截到登录界面，临时没发现问题
				setCookiesVia2Url(url, url3);
				view.loadUrl(url3);
			}
			// paypal登录界面载入完成
			if (url.contains("https://www.paypal.com/au/cgi-bin/webscr") && url.contains("#m")) {
				dialog.dismiss();
			}
			// Place Order界面载入完成
			if (url.contains("http://www.chinabuye.com/m/paypal/express/review")) {
				// 虽然在这之前已经进行了隐藏操作，可是偶尔还是会出现没有隐藏的情况，这里又一次载入一次
				hidePlaceOrderJS(view);
				dialog.dismiss();
			}
			// 下单成功的界面载入完成
			if (url.contains("http://www.chinabuye.com/m/checkout/onepage/success")) {
				// 虽然在这之前已经进行了隐藏操作，可是偶尔还是会出现没有隐藏的情况，这里又一次载入一次
				hideSaveOrderJS(view);
				dialog.dismiss();
				// 发送广播,清空购物车
				Intent intent = new Intent();
				intent.setAction(BroadAction.EMPTY);
				CheckoutActivity2.this.sendBroadcast(intent);
				Log.e("sendbroad", "buy.success");
			}
			// 用户邮箱信息为空
			if (url.contains("http://www.chinabuye.com/m/customer/account/edit")) {
				Toast.makeText(CheckoutActivity2.this, "Invalid email address NULL", 0).show();
			}
			super.onPageFinished(view, url);
		}

		// 处理在浏览器中的按键事件
		@Override
		public boolean shouldOverrideKeyEvent(WebView view, KeyEvent event) {
			if (event.equals(KeyEvent.KEYCODE_BACK) && view.canGoBack()) {
				view.goBack();
				return true;
			} else if (event.equals(KeyEvent.KEYCODE_BACK)) {
				CheckoutActivity2.this.finish();
				return true;
			}
			return super.shouldOverrideKeyEvent(view, event);
		}

		// 载入页面资源时会调用，比方载入图片时，每载入一张图片会调用一次
		@Override
		public void onLoadResource(WebView view, String url) {
			// Log.e(TAG, "loadResource:" + url);
			// Web购物车
			if (currentUrl.contains("http://www.chinabuye.com/m/checkout/cart")) {
				hideMCartJS(view);
			}
			
			// Place Order
			if (currentUrl.contains("http://www.chinabuye.com/m/paypal/express/review")) {
				hidePlaceOrderJS(view);
			}
			// 下单成功的页面
			if (currentUrl.contains("http://www.chinabuye.com/m/checkout/onepage/success")) {
				hideSaveOrderJS(view);
			}
			// 改动地址的时候，最先调用的是该方法，为了体验好，这里先显示对话框
			if (url.contains("http://www.chinabuye.com/m/paypal/express/ajaxEditAddress")) {
				dialog.show();
			}
			super.onLoadResource(view, url);

		}
	}

	// 隐藏M Cart界面的头部和底部
	private void hideMCartJS(WebView view) {
		view.loadUrl("javascript:window.handler.show(document.getElementById('topheader').style.display='none');");
		view.loadUrl("javascript:window.handler.show(document.getElementById('footer').style.display='none');");
	}

	// 隐藏Place Order界面
	private void hidePlaceOrderJS(WebView view) {
		// 隐藏用户和logo信息
		view.loadUrl("javascript:window.handler.show(document.getElementById('topheader').style.display='none');");
		// 隐藏placeorder之后
		view.loadUrl("javascript:window.handler.show(document.getElementById('iph_menu').style.display='none');");
		// 隐藏最底部联系我们等信息
		view.loadUrl("javascript:window.handler.show(document.getElementById('footer').style.display='none');");
		// 隐藏Review Review Order和Shipping Reminders信息
		view.loadUrl("javascript:window.handler.show(document.getElementById('paypal_page_head').style.display='none');");
		view.loadUrl("javascript:window.handler.show(document.getElementById('paypal_important').style.display='none');");
		// 细节隐藏
		// view.loadUrl("javascript:window.handler.show(document.getElementById('paypal_change_shipping_address').style.display='none');");
		view.loadUrl("javascript:window.handler.show(document.getElementById('paypal_change_payment_method').style.display='none');");
		view.loadUrl("javascript:window.handler.show(document.getElementById('paypal_edit_shopping_cart').style.display='none');");
	}

	// 隐藏Save Order界面
	private void hideSaveOrderJS(WebView view) {
		view.loadUrl("javascript:window.handler.show(document.getElementById('topheader').style.display='none');");
		view.loadUrl("javascript:window.handler.show(document.getElementById('footer').style.display='none');");
		view.loadUrl("javascript:window.handler.show(document.getElementById('iph_menu').style.display='none');");
		view.loadUrl("javascript:window.handler.show(document.getElementsByClassName('button-set')[0].style.display='none');");

	}

	private class MyChromeClient extends WebChromeClient {

		// 处理javascript中的confirm，确认
		// 登录界面有该对话框
		// 继续页面有该对话框
		@Override
		public boolean onJsConfirm(WebView view, String url, String message, final JsResult result) {
			Builder builder = new Builder(CheckoutActivity2.this);
			builder.setTitle("Confirm Dialog");
			builder.setMessage("Cancle the purchase and return to the ShoppingCart");
			Log.e(TAG, "Mesage:" + message);
			Log.e(TAG, "JsResult:" + result.toString());
			builder.setPositiveButton(R.string.ok, new AlertDialog.OnClickListener() {
				@Override
				public void onClick(DialogInterface dialog, int which) {
					// result.confirm();
					// 拦截确定button
					Intent intent = new Intent(CheckoutActivity2.this, CartActivity.class);
					startActivity(intent);
					finish();
				}
			});
			builder.setNegativeButton(R.string.cancel, new AlertDialog.OnClickListener() {
				@Override
				public void onClick(DialogInterface dialog, int which) {
					// 拦截取消button
					result.cancel();
				}
			});
			builder.setCancelable(false);
			builder.create();
			builder.show();
			return true;
		}
	}
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if(keyCode == KeyEvent.KEYCODE_BACK){
			//这样会出现非常多奇怪的问题，还是直接结束
//			if(webView.canGoBack()){
//				webView.goBack();
//			}else{
//				CheckoutActivity2.this.finish();
//			}
			CheckoutActivity2.this.finish();
			return true;
		}
		return super.onKeyDown(keyCode, event);
	}
}