如何在Android App中接入微信支付

本篇简单介绍Android App中接入微信支付,包括App内支付和扫码支付。分享+支付 pofei

微信支付

wechat 官方接入文档

App内支付

源码下载

主要流程:

1.微信支付平台注册账号​

注:注册并申请成功以后,需要在API安全中设置你的API密钥 32个字符。建议使用 MD5加密 ,并且需要妥善的保存。因为无法查看。

2.生成预支付订单

3.生成签名参数

4.调起微信,完成支付

扫码支付

扫码支付使用的是微信统一下单API ,使用的是模式二,模式一 一直说URL参数错误,完全按照官方文档来的 令人费解。

统一下单API

统一下单API

在上面的基础上,修改

private String getProductArgs() {

// TODO Auto-generated method stub

StringBuffer xml=new StringBuffer();

try {

String nonceStr=getNonceStr();

currentOrderId = getOutTrade();

xml.append("<xml>");

List<NameValuePair> packageParams=new LinkedList<NameValuePair>();

packageParams.add(new BasicNameValuePair("appid", WXConstants.APP_ID));

packageParams.add(new BasicNameValuePair("body", "APP pay test"));

packageParams.add(new BasicNameValuePair("mch_id", WXConstants.MCH_ID));

packageParams.add(new BasicNameValuePair("nonce_str", nonceStr));

// 回调 URL 地址,这里是第三方

packageParams.add(new BasicNameValuePair("notify_url", "http://www.weixunyunduan.com/yunduanwx/wxpay/getpackage"));

// 商户系统内部订单号,要求32个字符 且同个商户下唯一

packageParams.add(new BasicNameValuePair("out_trade_no", getNonceStr()));

// APP和网页支付提交用户端,Native支付填调用微信支付API的机器IP

packageParams.add(new BasicNameValuePair("spbill_create_ip", "192.168.0.1"));

packageParams.add(new BasicNameValuePair("total_fee", "1"));

// Native支付

packageParams.add(new BasicNameValuePair("trade_type", "NATIVE"));

String sign=getPackageSign(packageParams);

packageParams.add(new BasicNameValuePair("sign", sign));

String xmlString=toXml(packageParams);

return xmlString;

} catch (Exception e) {

// TODO: handle exception

return null;

}

}

private String getOutTrade(){

return UUID.randomUUID().toString().replace("-", "");

}

NATIVE请求返回值如下:

<xml>

<return_code><![CDATA[SUCCESS]]></return_code>

<return_msg><![CDATA[OK]]></return_msg>

<appid><![CDATA[]]></appid>

<mch_id><![CDATA[]]></mch_id>

<nonce_str><![CDATA[]]></nonce_str>

<sign><![CDATA[]]></sign>

<result_code><![CDATA[SUCCESS]]></result_code>

<prepay_id><![CDATA[]]></prepay_id>

<trade_type><![CDATA[NATIVE]]></trade_type>

<code_url><![CDATA[weixin://wxpay/bizpayurl?pr=]></code_url>

</xml>

获取code_url,并使用第三方二维码生成库 如ZXing 生成二维码。

ZXingUtils

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.Bitmap.Config;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.PointF;

import android.view.Gravity;

import android.view.View.MeasureSpec;

import android.widget.LinearLayout;

import android.widget.LinearLayout.LayoutParams;

import android.widget.TextView;

import com.google.zxing.BarcodeFormat;

import com.google.zxing.EncodeHintType;

import com.google.zxing.MultiFormatWriter;

import com.google.zxing.WriterException;

import com.google.zxing.common.BitMatrix;

import com.google.zxing.qrcode.QRCodeWriter;

import java.util.Hashtable;

/**

*

* 生成条形码和二维码的工具

*/

public class ZXingUtils {

/**

* 生成二维码 要转换的地址或字符串,可以是中文

*

* @param url

* @param width

* @param height

* @return

*/

public static Bitmap createQRImage(String url, final int width, final int height) {

try {

// 判断URL合法性

if (url == null || "".equals(url) || url.length() < 1) {

return null;

}

Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();

hints.put(EncodeHintType.CHARACTER_SET, "utf-8");

// 图像数据转换,使用了矩阵转换

BitMatrix bitMatrix = new QRCodeWriter().encode(url,

BarcodeFormat.QR_CODE, width, height, hints);

int[] pixels = new int[width * height];

// 下面这里按照二维码的算法,逐个生成二维码的图片,

// 两个for循环是图片横列扫描的结果

for (int y = 0; y < height; y++) {

for (int x = 0; x < width; x++) {

if (bitMatrix.get(x, y)) {

pixels[y * width + x] = 0xff000000;

} else {

pixels[y * width + x] = 0xffffffff;

}

}

}

// 生成二维码图片的格式,使用ARGB_8888

Bitmap bitmap = Bitmap.createBitmap(width, height,

Bitmap.Config.ARGB_8888);

bitmap.setPixels(pixels, 0, width, 0, 0, width, height);

return bitmap;

} catch (WriterException e) {

e.printStackTrace();

}

return null;

}

/**

* 生成条形码

*

* @param context

* @param contents

* 需要生成的内容

* @param desiredWidth

* 生成条形码的宽带

* @param desiredHeight

* 生成条形码的高度

* @param displayCode

* 是否在条形码下方显示内容

* @return

*/

public static Bitmap creatBarcode(Context context, String contents,

int desiredWidth, int desiredHeight, boolean displayCode) {

Bitmap ruseltBitmap = null;

/**

* 图片两端所保留的空白的宽度

*/

int marginW = 20;

/**

* 条形码的编码类型

*/

BarcodeFormat barcodeFormat = BarcodeFormat.CODE_128;

if (displayCode) {

Bitmap barcodeBitmap = encodeAsBitmap(contents, barcodeFormat,

desiredWidth, desiredHeight);

Bitmap codeBitmap = creatCodeBitmap(contents, desiredWidth + 2

* marginW, desiredHeight, context);

ruseltBitmap = mixtureBitmap(barcodeBitmap, codeBitmap, new PointF(

0, desiredHeight));

} else {

ruseltBitmap = encodeAsBitmap(contents, barcodeFormat,

desiredWidth, desiredHeight);

}

return ruseltBitmap;

}

/**

* 生成条形码的Bitmap

*

* @param contents

* 需要生成的内容

* @param format

* 编码格式

* @param desiredWidth

* @param desiredHeight

* @return

* @throws WriterException

*/

protected static Bitmap encodeAsBitmap(String contents,

BarcodeFormat format, int desiredWidth, int desiredHeight) {

final int WHITE = 0xFFFFFFFF;

final int BLACK = 0xFF000000;

MultiFormatWriter writer = new MultiFormatWriter();

BitMatrix result = null;

try {

result = writer.encode(contents, format, desiredWidth,

desiredHeight, null);

} catch (WriterException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

int width = result.getWidth();

int height = result.getHeight();

int[] pixels = new int[width * height];

// All are 0, or black, by default

for (int y = 0; y < height; y++) {

int offset = y * width;

for (int x = 0; x < width; x++) {

pixels[offset + x] = result.get(x, y) ? BLACK : WHITE;

}

}

Bitmap bitmap = Bitmap.createBitmap(width, height,

Bitmap.Config.ARGB_8888);

bitmap.setPixels(pixels, 0, width, 0, 0, width, height);

return bitmap;

}

/**

* 生成显示编码的Bitmap

*

* @param contents

* @param width

* @param height

* @param context

* @return

*/

protected static Bitmap creatCodeBitmap(String contents, int width,

int height, Context context) {

TextView tv = new TextView(context);

LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(

LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);

tv.setLayoutParams(layoutParams);

tv.setText(contents);

tv.setHeight(height);

tv.setGravity(Gravity.CENTER_HORIZONTAL);

tv.setWidth(width);

tv.setDrawingCacheEnabled(true);

tv.setTextColor(Color.BLACK);

tv.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),

MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));

tv.layout(0, 0, tv.getMeasuredWidth(), tv.getMeasuredHeight());

tv.buildDrawingCache();

Bitmap bitmapCode = tv.getDrawingCache();

return bitmapCode;

}

/**

* 将两个Bitmap合并成一个

*

* @param first

* @param second

* @param fromPoint

* 第二个Bitmap开始绘制的起始位置(相对于第一个Bitmap)

* @return

*/

protected static Bitmap mixtureBitmap(Bitmap first, Bitmap second,

PointF fromPoint) {

if (first == null || second == null || fromPoint == null) {

return null;

}

int marginW = 20;

Bitmap newBitmap = Bitmap.createBitmap(

first.getWidth() + second.getWidth() + marginW,

first.getHeight() + second.getHeight(), Config.ARGB_4444);

Canvas cv = new Canvas(newBitmap);

cv.drawBitmap(first, marginW, 0, null);

cv.drawBitmap(second, fromPoint.x, fromPoint.y, null);

cv.save(Canvas.ALL_SAVE_FLAG);

cv.restore();

return newBitmap;

}

}

Bitmap bitmap = ZXingUtils.createQRImage(wxUrl,200,200);

code_url为微信可以识别的短链。

用户扫描便可在手机上支付。

查询订单API

获取支付回调,使用查询订单API

查询订单API

String urlString="https://api.mch.weixin.qq.com/pay/orderquery";

CheckAsyncTask checkAsyncTask = new CheckAsyncTask();

checkAsyncTask.execute(urlString);

private class CheckAsyncTask extends AsyncTask<String,Void, Map<String, String>>

{

private ProgressDialog dialog;

@Override

protected void onPreExecute() {

// TODO Auto-generated method stub

super.onPreExecute();

dialog = ProgressDialog.show(PayActivity.this, "提示", "正在查看订单状态!");

}

@Override

protected Map<String, String> doInBackground(String... params) {

// TODO Auto-generated method stub

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

String entity=getProductCheckArgs();

byte[] buf= wxUtils.httpPost(url, entity);

String content = new String(buf);

Map<String,String> xml=decodeXml(content);

// 可以通过 xml.get("trade_state"); 获取订单的状态

return xml;

}

@Override

protected void onPostExecute(Map<String, String> result) {

// TODO Auto-generated method stub

super.onPostExecute(result);

if (dialog != null) {

dialog.dismiss();

}

}

}

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