1.集成微信支付SDK：

在build.gradle中，添加如下依赖

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

2.设置微信支付回调页面：

路径：项目包名.wxapi
名称：WXPayEntryActivity

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; }}

errCode:说明
0：成功……展示成功页面。
-1：错误……可能的原因：签名错误、未注册APPID、项目设置APPID不正确、注册的APPID与设置的不匹配、其他异常等。
-2：用户取消……无需处理。发生场景：用户不支付了，点击取消，返回APP。

3.设置Manifest

<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>

4.设置MD5

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; } }}

5.发起微信支付

/** * 注册微信支付 */private void registerWx() { IWXAPI wxapi = WXAPIFactory.createWXAPI(context, null); wxapi.registerApp("你的APP_ID");}/** * 发起微信支付 */private void wxPay() { PayReq payReq = new PayReq(); payReq.appId = "后台返回的appId"; payReq.partnerId = "后台返回的partnerId"; payReq.prepayId = "后台返回的prepayId"; payReq.packageValue = "后台返回的package"; payReq.nonceStr = "后台返回的nonceStr"; payReq.timeStamp = "后台返回的timeStamp"; payReq.signType = "后台返回的signType"; payReq.sign = signNum(); wxapi.sendReq(payReq);}/** * 拼接sign */public static String signNum() { String stringA = "appid=" + "后台返回的appid" + "&noncestr=" + "后台返回的noncestr" + "&package=" + "后台返回的package" + "&partnerid=" + "后台返回的partnerid" + "&prepayid=" + "后台返回的prepayid" + "&timestamp=" + "后台返回的timestamp"; String stringSignTemp = stringA + "&key=" + "后台商户服务端的key"; String sign = MD5.getMessageDigest(stringSignTemp.getBytes()).toUpperCase(); return sign;}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。