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

wechat 官方接入文档

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_8888Bitmap 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 blocke.printStackTrace();}int width = result.getWidth();int height = result.getHeight();int[] pixels = new int[width * height];// All are 0, or black, by defaultfor (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。

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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