如何在Android App中接入微信支付

 private String getProductArgs() { // TODO Auto-generated method stub StringBuffer xml=new StringBuffer(); try { String nonceStr=getNonceStr(); currentOrderId = getOutTrade(); xml.append(""); List packageParams=new LinkedList(); 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("-", ""); }

 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 hints = new Hashtable(); 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);

 String urlString="https://api.mch.weixin.qq.com/pay/orderquery"; CheckAsyncTask checkAsyncTask = new CheckAsyncTask(); checkAsyncTask.execute(urlString); private class CheckAsyncTask extends AsyncTask> { 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 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 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 result) { // TODO Auto-generated method stub super.onPostExecute(result); if (dialog != null) { dialog.dismiss(); } } }