yusheng-android/app/src/main/java/com/qxcm/qxlive/wxapi/WXPayEntryActivity.java

package com.qxcm.qxlive.wxapi;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;

import com.blankj.utilcode.util.ToastUtils;
import com.tencent.mm.opensdk.constants.ConstantsAPI;
import com.tencent.mm.opensdk.modelbase.BaseReq;
import com.tencent.mm.opensdk.modelbase.BaseResp;
import com.tencent.mm.opensdk.openapi.IWXAPI;
import com.tencent.mm.opensdk.openapi.IWXAPIEventHandler;
import com.tencent.mm.opensdk.openapi.WXAPIFactory;
import com.xscm.moduleutil.base.CommonAppContext;
import com.xscm.moduleutil.event.PayEvent;

import org.greenrobot.eventbus.EventBus;

public class WXPayEntryActivity extends Activity implements IWXAPIEventHandler {
    private IWXAPI api;
    public static final String APP_ID = CommonAppContext.getInstance().getCurrentEnvironment().getWxAppId();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        api = WXAPIFactory.createWXAPI(this, APP_ID);
        api.handleIntent(getIntent(), this); // 必须调用，否则无法接收回调
    }

    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
        setIntent(intent);
        api.handleIntent(intent, this);
    }

    @Override
    public void onReq(BaseReq baseReq) {

    }

    @Override
    public void onResp(BaseResp resp) {
        // 支付结果回调（resp.getType() == ConstantsAPI.COMMAND_PAY_BY_WX）
        if (resp.getType() == ConstantsAPI.COMMAND_PAY_BY_WX) {
            switch (resp.errCode) {
                case BaseResp.ErrCode.ERR_OK:
                    // 支付成功：这里需要调用后台接口确认支付状态（避免本地判断不可靠）

                    break;
                case BaseResp.ErrCode.ERR_USER_CANCEL:
                    checkPayResultFromServer();
                    break;
                default:
                    // 支付失败
                    checkPayResultFromServer();
                    break;
            }
            finish(); // 处理完后关闭页面
        }
    }

    // 关键：必须从后台确认支付状态（不能仅依赖前端回调）
    private void checkPayResultFromServer() {
        // 调用后台接口，传入订单号查询实际支付状态
        // 用户取消支付
        ToastUtils.showShort("支付取消");
        PayEvent messageEvent = new PayEvent(-2, "支付取消");
        EventBus.getDefault().post(messageEvent);
    }
}