【移動應用開發(fā)技術】Android中怎么實現微信支付功能

【移動應用開發(fā)技術】Android中怎么實現微信支付功能

Android中怎么實現微信支付功能，相信很多沒有經驗的人對此束手無策，為此本文總結了問題出現的原因和解決方法，通過這篇文章希望你能解決這個問題。1.去微信開放平臺申請微信支付服務，綁定自己的應用這里具體不多講，但是一定要申請完成，將會得到是三個參數//appid

微信分配的公眾賬號ID

public

static

final

String

APP_ID

=

"";

//商戶號

微信分配的公眾賬號ID

public

static

final

String

MCH_ID

=

"";

//

API密鑰，在商戶平臺設置

public

static

final

String

API_KEY=

"";**坑點提示：在微信開發(fā)平臺設置包名和簽名。這里的包名一定要和你自己的包名一樣，就是manifest中的package,簽名一定要和你用官方app生成的一樣(/zh_CN/htmledition/res/dev/download/sdk/Gen_Signature_Android.apk)。微信會根據你的填寫的包名，然后對你的keystore進行一種算法，生成你的簽名。包名和簽名一定要和微信開放平臺的相同。不過這里需要注意的是，如果你發(fā)布的正式版本，需要用官方app重新生成簽名，然后在開放平臺重新設置sign，因為測試版本的keystore與正式版的keystore不一樣?？傊?，就是你用的keystore生成的sign要和微信開放平臺的時刻保持一致。**2.準備工作做好了，接下來就是開發(fā)了，先下載微信的jar包，導入。微信支付分為三個步驟①.生成prepayId@Override

protected

Map<String,

String>

doInBackground(String...

params)

{

//

TODO

Auto-generated

method

stub

String

url=String.format(params[0]);

String

entity=getProductArgs();

Log.e("Simon",">>>>"+entity);

byte[]

buf=Util.httpPost(url,

entity);

String

content

=

new

String(buf);

Log.e("orion",

""+content);

Map<String,String>

xml=decodeXml(content);

return

xml;

}②.生成簽名參數private

void

genPayReq()

{

req.appId

=

Constants.APP_ID;

req.partnerId

=

Constants.MCH_ID;

if

(resultunifiedorder!=null)

{

req.prepayId

=

resultunifiedorder.get("prepay_id");

req.packageValue

=

"prepay_id="+resultunifiedorder.get("prepay_id");

}

else

{

Toast.makeText(MainActivity.this,

"prepayid為空",

Toast.LENGTH_SHORT).show();

}

req.nonceStr

=

getNonceStr();

req.timeStamp

=

String.valueOf(genTimeStamp());

List<NameValuePair>

signParams

=

new

LinkedList<NameValuePair>();

signParams.add(new

BasicNameValuePair("appid",

req.appId));

signParams.add(new

BasicNameValuePair("noncestr",

req.nonceStr));

signParams.add(new

BasicNameValuePair("package",

req.packageValue));

signParams.add(new

BasicNameValuePair("partnerid",

req.partnerId));

signParams.add(new

BasicNameValuePair("prepayid",

req.prepayId));

signParams.add(new

BasicNameValuePair("timestamp",

req.timeStamp));

req.sign

=

genAppSign(signParams);

sb.append("sign\n"+req.sign+"\n\n");

textView.setText(sb.toString());

Log.e("Simon",

""+signParams.toString());

}③.調起支付/*

*

調起微信支付

*/

private

void

sendPayReq()

{

msgApi.registerApp(Constants.APP_ID);

msgApi.sendReq(req);

Log.i(">>>>>",

req.partnerId);

}下面給出完整代碼

package

com.alpha.live;

import

java.io.StringReader;

import

java.util.HashMap;

import

java.util.LinkedList;

import

java.util.List;

import

java.util.Map;

import

java.util.Random;

import

org.apache.http.NameValuePair;

import

org.apache.http.message.BasicNameValuePair;

import

org.xmlpull.v1.XmlPullParser;

import

com.tencent.mm.sdk.modelpay.PayReq;

import

com.tencent.mm.sdk.openapi.IWXAPI;

import

com.tencent.mm.sdk.openapi.WXAPIFactory;

import

android.app.Activity;

import

android.app.AlertDialog;

import

android.app.ProgressDialog;

import

android.os.AsyncTask;

import

android.os.Bundle;

import

android.util.Log;

import

android.util.Xml;

import

android.view.View;

import

android.view.View.OnClickListener;

import

android.widget.Button;

import

android.widget.TextView;

import

android.widget.Toast;

/**

*

Created

by

Simon

on

2016/12/2.

*/

public

class

MainActivity

extends

Activity

implements

OnClickListener

{

private

Button

submitButton;

private

Button

confirmButton;

private

TextView

textView;

private

StringBuffer

sb;

private

Map<String,String>

resultunifiedorder;

private

PayReq

req;

private

final

IWXAPI

msgApi

=

WXAPIFactory.createWXAPI(this,

null);

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

submitButton=(Button)

findViewById(R.id.bt_submit_order);

confirmButton=(Button)

findViewById(R.id.bt_corfirm);

textView=(TextView)

findViewById(R.id.tv_prepay_id);

submitButton.setOnClickListener(this);

confirmButton.setOnClickListener(this);

sb=new

StringBuffer();

req=new

PayReq();

}

@Override

public

void

onClick(View

v)

{

//

TODO

Auto-generated

method

stub

switch

(v.getId())

{

case

R.id.bt_submit_order:

String

urlString="/pay/unifiedorder";

PrePayIdAsyncTask

prePayIdAsyncTask=new

PrePayIdAsyncTask();

prePayIdAsyncTask.execute(urlString);

//生成prepayId

break;

case

R.id.bt_corfirm:

genPayReq();//生成簽名參數

sendPayReq();//調起支付

break;

default:

break;

}

}

/*

*

調起微信支付

*/

private

void

sendPayReq()

{

msgApi.registerApp(Constants.APP_ID);

msgApi.sendReq(req);

Log.i(">>>>>",

req.partnerId);

}

private

long

genTimeStamp()

{

return

System.currentTimeMillis()

/

1000;

}

private

void

genPayReq()

{

req.appId

=

Constants.APP_ID;

req.partnerId

=

Constants.MCH_ID;

if

(resultunifiedorder!=null)

{

req.prepayId

=

resultunifiedorder.get("prepay_id");

req.packageValue

=

"prepay_id="+resultunifiedorder.get("prepay_id");

}

else

{

Toast.makeText(MainActivity.this,

"prepayid為空",

Toast.LENGTH_SHORT).show();

}

req.nonceStr

=

getNonceStr();

req.timeStamp

=

String.valueOf(genTimeStamp());

List<NameValuePair>

signParams

=

new

LinkedList<NameValuePair>();

signParams.add(new

BasicNameValuePair("appid",

req.appId));

signParams.add(new

BasicNameValuePair("noncestr",

req.nonceStr));

signParams.add(new

BasicNameValuePair("package",

req.packageValue));

signParams.add(new

BasicNameValuePair("partnerid",

req.partnerId));

signParams.add(new

BasicNameValuePair("prepayid",

req.prepayId));

signParams.add(new

BasicNameValuePair("timestamp",

req.timeStamp));

req.sign

=

genAppSign(signParams);

sb.append("sign\n"+req.sign+"\n\n");

textView.setText(sb.toString());

Log.e("Simon",

""+signParams.toString());

}

private

String

genAppSign(List<NameValuePair>

params)

{

StringBuilder

sb

=

new

StringBuilder();

for

(int

i

=

0;

i

<

params.size();

i++)

{

sb.append(params.get(i).getName());

sb.append('=');

sb.append(params.get(i).getValue());

sb.append('&');

}

sb.append("key=");

sb.append(Constants.API_KEY);

this.sb.append("sign

str\n"+sb.toString()+"\n\n");

String

appSign

=

MD5.getMessageDigest(sb.toString().getBytes());

Log.e("Simon",""+appSign);

return

appSign;

}

private

class

PrePayIdAsyncTask

extends

AsyncTask<String,Void,

Map<String,

String>>

{

private

ProgressDialog

dialog;

@Override

protected

void

onPreExecute()

{

//

TODO

Auto-generated

method

stub

super.onPreExecute();

dialog

=

ProgressDialog.show(MainActivity.this,

"提示",

"正在提交訂單");

}

@Override

protected

Map<String,

String>

doInBackground(String...

params)

{

//

TODO

Auto-generated

method

stub

String

url=String.format(params[0]);

String

entity=getProductArgs();

Log.e("Simon",">>>>"+entity);

byte[]

buf=Util.httpPost(url,

entity);

String

content

=

new

String(buf);

Log.e("orion",

""+content);

Map<String,String>

xml=decodeXml(content);

return

xml;

}

@Override

protected

void

onPostExecute(Map<String,

String>

result)

{

//

TODO

Auto-generated

method

stub

super.onPostExecute(result);

if

(dialog

!=

null)

{

dialog.dismiss();

}

sb.append("prepay_id\n"+result.get("prepay_id")+"\n\n");

textView.setText(sb.toString());

resultunifiedorder=result;

}

}

public

Map<String,String>

decodeXml(String

content)

{

try

{

Map<String,

String>

xml

=

new

HashMap<String,

String>();

XmlPullParser

parser

=

Xml.newPullParser();

parser.setInput(new

StringReader(content));

int

event

=

parser.getEventType();

while

(event

!=

XmlPullParser.END_DOCUMENT)

{

String

nodeName=parser.getName();

switch

(event)

{

case

XmlPullParser.START_DOCUMENT:

break;

case

XmlPullParser.START_TAG:

if("xml".equals(nodeName)==false){

//實例化student對象

xml.put(nodeName,parser.nextText());

}

break;

case

XmlPullParser.END_TAG:

break;

}

event

=

parser.next();

}

return

xml;

}

catch

(Exception

e)

{

Log.e("Simon",""+e.toString());

}

return

null;

}

private

String

getProductArgs()

{

//

TODO

Auto-generated

method

stub

StringBuffer

xml=new

StringBuffer();

try

{

String

nonceStr=getNonceStr();

xml.append("<xml>");

List<NameValuePair>

packageParams=new

LinkedList<NameValuePair>();

packageParams.add(new

BasicNameValuePair("appid",Constants.APP_ID));

packageParams.add(new

BasicNameValuePair("body",

"APP

pay

test"));

packageParams.add(new

BasicNameValuePair("mch_id",

Constants.MCH_ID));

packageParams.add(new

BasicNameValuePair("nonce_str",

nonceStr));

packageParams.add(new

BasicNameValuePair("notify_url",

""));//寫你們的回調地址

packageParams.add(new

BasicNameValuePair("out_trade_no",genOutTradNo()));

packageParams.add(new

BasicNameValuePair("total_fee",

"1"));

packageParams.add(new

BasicNameValuePair("trade_type",

"APP"));

String

sign=getPackageSign(packageParams);

packageParams.add(new

BasicNameValuePair("sign",

sign));

String

xmlString=toXml(packageParams);

return

xmlString;

}

catch

(Exception

e)

{

//

TODO:

handle

exception

return

null;

}

}

//生成訂單號,測試用，在客戶端生成

private

String

genOutTradNo()

{

Random

random

=

new

Random();

//

return

"dasgfsdg1234";

//訂單號寫死的話只能支付一次，第二次不能生成訂單

return

MD5.getMessageDigest(String.valueOf(random.nextInt(10000)).getBytes());

}

//生成隨機號，防重發(fā)

private

String

getNonceStr()

{

//

TODO

Auto-generated