Android 移动支付插件demo(主应用+支付插件)

     本文主要讲解下类似于支付宝、银联支付的第三方支付插件开发流程（应用调用支付插件流程+支付插件主逻辑开发）。

一、首先介绍下什么是aidl和icp：

     aidl是 Android Interface definition language的缩写，它是一种android内部进程通信接口的描述语言，通过它我们可以定义进程间的通信接口；

     icp:interprocess communication :内部进程通信。

二、支付插件开发要先掌握aidl使用方法，下面我来介绍下支付插件开发的流程：

1、我们需要创建一个支付插件工程，如图所示：

在IPayService.aidl中我们定义了支付、注册回调、注销回调等方法，代码如下：

package com.lukejun.app;

import com.lukejun.app.IRemoteServiceCallback;

interface IPayService {
	String pay(String orderInfo);
	String prePay(String pre);
	void registerCallback(IRemoteServiceCallback callback);
	String test();
	void unregisterCallback(IRemoteServiceCallback callback);
}

IRemoteServiceCallback.aidl就是上面用到的回调接口，其中startActivity方法是从主应用中activity进入支付插件中activity，在插件activity中可做支付业务操作，代码如图：

package com.lukejun.app;

import android.os.Bundle;

interface IRemoteServiceCallback {
	void startActivity(String packageName , String className, int iCallingPid, in Bundle bundle);
	boolean isHideLoadingScreen();
	void payEnd(boolean arg0, String arg1);
}

接下来贴MyRemoteService代码，如图：

public class MyRemoteService extends Service{


	public class MIPayService extends IPayService.Stub{
		IRemoteServiceCallback iCallback = null;
		@Override
		public String pay(String orderInfo) throws RemoteException {
			if(iCallback != null){
				Bundle bundle = new Bundle();
				bundle.putString("orderInfo", orderInfo);
				iCallback.startActivity(getPackageName(), "com.lukejun.app.ShowActivity", 1, bundle);
				
			}
			String result = null;
			while (true) {
				result = PayResult.getInstance().getResult();
				PayResult.getInstance().setResult(null);
				if(null != result){
					break;
				}
				try {
					Thread.sleep(1000);
				} catch (InterruptedException e) {
					
					e.printStackTrace();
				}
				
			}
			
			return result;
		}

		@Override
		public String prePay(String pre) throws RemoteException {
			// TODO Auto-generated method stub
			return null;
		}

		@Override
		public void registerCallback(IRemoteServiceCallback callback)
				throws RemoteException {
			iCallback = callback;
			
		}

		@Override
		public String test() throws RemoteException {
			
			return null;
		}

		@Override
		public void unregisterCallback(IRemoteServiceCallback callback)
				throws RemoteException {
			iCallback = null;
			
		}
		
	}
	
	@Override
	public IBinder onBind(Intent intent) {

		return new MIPayService() ;
	}
	@Override
	public void onCreate() {
		
		super.onCreate();
		
	}
	 
	@Override
	public void onDestroy() {

		super.onDestroy();
	}
	
}

我们通过实现IPayService类，在pay方法中读取从主应用中传来的支付订单信息（orderInfo），调用IRemoteServiceCallback的startactivity方法进入插件页面进行业务操作，然后建立while循环一直等待插件业务处理后的支付结果，得到支付结果后跳出循环，把支付结果返回给主应用。

2、支付插件端的主要逻辑已经完成了，接下来我们介绍主应用调用插件方法，工程截图如下：

把支付插件端的IPayService和IRemoteServiceCallback连包一起拷贝到主应用要（保持包名一致），一般第三方支付都会打包成jar包供主应用调用，下面贴下主应用调用示例：

public class TextActivity extends Activity{
	
	private MobileSecurePayHelper mspHelper;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		mspHelper = new MobileSecurePayHelper(this);
		findViewById(R.id.Button01).setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				boolean isMobile_spExist = mspHelper.detectMobile_sp();
				//检测插件支付安装，如果没有安装提示安装和是否插件有更新。
                if (!isMobile_spExist){
                    return;
                }
				MobileSecurePayer msp = new MobileSecurePayer();
				boolean bRet = msp.pay("content", mHandler, Constants.RQF_PAY,
                        TextActivity.this);
				Log.i(TextActivity.class.getSimpleName(), String.valueOf(bRet));
			}
		});
		
	}
	
	private Handler mHandler = createHandler();
	private Handler createHandler()
    {
        return new Handler(){
            public void handleMessage(Message msg)
            {
                String strRet = (String) msg.obj;
               Toast.makeText(TextActivity.this, strRet, Toast.LENGTH_SHORT).show();
                super.handleMessage(msg);
            }
        };

    }
}

下面讲解下pay方法，代码如下：

public boolean pay(final String strOrderInfo, final Handler callback,
			final int myWhat, final Activity activity) {
		if (mbPaying)
			return false;
		mbPaying = true;
		mActivity = activity;
		// bind the service.
		// 绑定服务
		if (payService == null) {
			// 绑定安全支付服务需要获取上下文环境，
			// 如果绑定不成功使用mActivity.getApplicationContext().bindService
			// 解绑时同理
			mActivity.getApplicationContext().bindService(
					new Intent("com.lukejun.app.action.MY_REMOTE_SERVICE"),
					mSecurePayConnection, Context.BIND_AUTO_CREATE);		
		}
		// else ok.
		// 实例一个线程来进行支付
		new Thread(new Runnable() {
			public void run() {
				try {
					// wait for the service bind operation to completely
					// finished.
					// Note: this is important,otherwise the next
					// payService.Pay()
					// will fail.
					// 等待安全支付服务绑定操作结束
					// 注意：这里很重要，否则payService.pay()方法会失败
					synchronized (lock) {
						if (payService == null)
							lock.wait();
					}					
					// register a Callback for the service.
					// 为安全支付服务注册一个回调
					payService.registerCallback(mCallback);

					// call the MobileSecurePay service.
					// 调用安全支付服务的pay方法
					String strRet = payService.pay(strOrderInfo);
					BaseHelper.log(TAG, "服务端支付结果：" + strRet);
					
					// set the flag to indicate that we have finished.
					// unregister the Callback, and unbind the service.
					// 将mbPaying置为false，表示支付结束
					// 移除回调的注册，解绑安全支付服务
					mbPaying = false;
					payService.unregisterCallback(mCallback);
					mActivity.getApplicationContext().unbindService(
							mSecurePayConnection);

					// send the result back to caller.
					// 发送交易结果
					Message msg = new Message();
					msg.what = myWhat;
					msg.obj = strRet;
					callback.sendMessage(msg);
				} catch (Exception e) {
					e.printStackTrace();
					// send the result back to caller.
					// 发送交易结果
					Message msg = new Message();
					msg.what = myWhat;
					msg.obj = e.toString();
					callback.sendMessage(msg);
				}
			}
		}).start();

		return true;
	}

private IRemoteServiceCallback mCallback = new IRemoteServiceCallback.Stub() {
		/**
		 * This is called by the remote service regularly to tell us about new
		 * values. Note that IPC calls are dispatched through a thread pool
		 * running in each process, so the code executing here will NOT be
		 * running in our main thread like most other things -- so, to update
		 * the UI, we need to use a Handler to hop over there. 通过IPC机制启动安全支付服务
		 */
		public void startActivity(String packageName, String className,
				int iCallingPid, Bundle bundle) throws RemoteException {
			Intent intent = new Intent(Intent.ACTION_MAIN, null);

			if (bundle == null)
				bundle = new Bundle();
			// else ok.

			try {
				bundle.putInt("CallingPid", iCallingPid);
				intent.putExtras(bundle);
			} catch (Exception e) {
				e.printStackTrace();
			}

			intent.setClassName(packageName, className);
			mActivity.startActivity(intent);
		}

		/**
		 * when the msp loading dialog gone, call back this method.
		 */
		@Override
		public boolean isHideLoadingScreen() throws RemoteException {
			return false;
		}

		/**
		 * when the current trade is finished or cancelled, call back this
		 * method.
		 */
		@Override
		public void payEnd(boolean arg0, String arg1) throws RemoteException {

		}

	};

3、demo运行流程：把RemoteServiceText工程的apk安装包复制到 RemoteClientText的assets文件中中，然后运行RemoteClientText工程，就介绍到这里，如有需要可以自己下载代码看看。

代码下载：http://download.youkuaiyun.com/detail/lukejun1988/7368517