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
App内支付
可以参照 Android 微信支付详解与Demo
主要流程：
1.1 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。
2.2 生成预支付订单
3.3 生成签名参数
4.4 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
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
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();
}
}
}