compile 'com.tencent.mm.opensdk:wechat-sdk-android-with-mta:+'

public class WXPayEntryActivity extends Activity implements IWXAPIEventHandler { private IWXAPI api; @Override public void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.wx_pay_result);  api = WXAPIFactory.createWXAPI(this, "你的APP_ID");  api.handleIntent(getIntent(), this); } @Override protected void onNewIntent(Intent intent) {  super.onNewIntent(intent);  setIntent(intent);  api.handleIntent(intent, this); } @Override public void onResp(BaseResp resp) {  int errCode = resp.errCode; }}

<activity android:name=".wxapi.WXPayEntryActivity" android:exported="true" android:launchMode="singleTop"> <intent-filter>  <action android:name="android.intent.action.VIEW" />  <category android:name="android.intent.category.DEFAULT" />  <data android:scheme="你的APP_ID" /> </intent-filter></activity>

public class MD5 { private MD5() { } public final static String getMessageDigest(byte[] buffer) {  char hexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};  try {   MessageDigest mdTemp = MessageDigest.getInstance("MD5");   mdTemp.update(buffer);   byte[] md = mdTemp.digest();   int j = md.length;   char str[] = new char[j * 2];   int k = 0;   for (int i = 0; i < j; i++) {    byte byte0 = md[i];    str[k++] = hexDigits[byte0 >>> 4 & 0xf];    str[k++] = hexDigits[byte0 & 0xf];   }   return new String(str);  } catch (Exception e) {   return null;  } }}

/** * 注冊微信支付 */private void registerWx() { IWXAPI wxapi = WXAPIFactory.createWXAPI(context, null); wxapi.registerApp("你的APP_ID");}/** * 發(fā)起微信支付 */private void wxPay() { PayReq payReq = new PayReq(); payReq.appId = "后臺返回的appId"; payReq.partnerId = "后臺返回的partnerId"; payReq.prepayId = "后臺返回的prepayId"; payReq.packageValue = "后臺返回的package"; payReq.nonceStr = "后臺返回的nonceStr"; payReq.timeStamp = "后臺返回的timeStamp"; payReq.signType = "后臺返回的signType"; payReq.sign = signNum(); wxapi.sendReq(payReq);}/** * 拼接sign */public static String signNum() { String stringA = "appid=" + "后臺返回的appid" +   "&noncestr=" + "后臺返回的noncestr" +   "&package=" + "后臺返回的package" +   "&partnerid=" + "后臺返回的partnerid" +   "&prepayid=" + "后臺返回的prepayid" +   "×tamp=" + "后臺返回的timestamp"; String stringSignTemp = stringA + "&key=" + "后臺商戶服務端的key"; String sign = MD5.getMessageDigest(stringSignTemp.getBytes()).toUpperCase(); return sign;}