如何用Activity Result Launcher替代onActivityResult实现Google Pay推送配置

你可以通过自定义Activity Result Contract来适配TapAndPayClient#pushTokenize()的场景，绕过已弃用的onActivityResult，具体实现步骤如下：

1. 自定义Activity Result Contract #

创建一个继承自ActivityResultContract的类，封装pushTokenize()的调用逻辑，无需手动管理请求码：

import android.app.Activity
import android.content.Context
import android.content.Intent
import androidx.activity.result.contract.ActivityResultContract
import com.google.android.gms.tapandpay.PushTokenizeRequest
import com.google.android.gms.tapandpay.TapAndPayClient

class TapAndPayPushTokenizeContract : ActivityResultContract<Pair<TapAndPayClient, PushTokenizeRequest>, Intent?>() {
    override fun createIntent(context: Context, input: Pair<TapAndPayClient, PushTokenizeRequest>): Intent {
        val (tapAndPayClient, request) = input
        // 直接调用pushTokenize获取要启动的Activity Intent，内部已处理请求码关联
        return tapAndPayClient.pushTokenize(context, request)
    }

    override fun parseResult(resultCode: Int, intent: Intent?): Intent? {
        // 仅返回成功状态下的Intent，也可根据需求返回resultCode和Intent的组合
        return if (resultCode == Activity.RESULT_OK) intent else null
    }
}

2. 注册Activity Result Launcher #

在你的Activity或Fragment中注册自定义的Launcher，并编写结果处理逻辑：

import android.app.Activity
import androidx.activity.result.ActivityResultLauncher
import com.google.android.gms.common.api.CommonStatusCodes
import com.google.android.gms.tapandpay.TapAndPayClient

private val pushTokenizeLauncher: ActivityResultLauncher<Pair<TapAndPayClient, PushTokenizeRequest>> =
    registerForActivityResult(TapAndPayPushTokenizeContract()) { resultIntent ->
        resultIntent?.let {
            val status = TapAndPayClient.getPushTokenizeResult(it)
            when (status.statusCode) {
                CommonStatusCodes.SUCCESS -> {
                    // 处理tokenize成功逻辑，比如获取token结果
                    val tokenResult = status.getTokenizationResult()
                }
                CommonStatusCodes.CANCELED -> {
                    // 用户取消操作
                }
                else -> {
                    // 处理错误情况，比如status.getStatusMessage()查看错误信息
                }
            }
        }
    }

3. 启动Push Tokenize流程 #

调用Launcher启动流程，无需手动传入请求码：

import com.google.android.gms.tapandpay.PushTokenizeRequest
import com.google.android.gms.tapandpay.TapAndPay

// 初始化TapAndPayClient和请求参数
val tapAndPayClient = TapAndPay.getClient(this)
val pushTokenizeRequest = PushTokenizeRequest.Builder()
    // 配置你的请求参数，比如paymentMethodToken、issuerName等
    .build()

// 启动流程
pushTokenizeLauncher.launch(tapAndPayClient to pushTokenizeRequest)

扩展：区分多组请求 #

如果需要同时处理多个不同的pushTokenize请求，可以修改Contract的输入为三元组，携带自定义标识：

// 修改Contract输入为Triple<TapAndPayClient, PushTokenizeRequest, Int>（Int为自定义请求标识）
class TapAndPayPushTokenizeContract : ActivityResultContract<Triple<TapAndPayClient, PushTokenizeRequest, Int>, Pair<Int, Intent?>>() {
    override fun createIntent(context: Context, input: Triple<TapAndPayClient, PushTokenizeRequest, Int>): Intent {
        val (tapAndPayClient, request, _) = input
        return tapAndPayClient.pushTokenize(context, request)
    }

    override fun parseResult(resultCode: Int, intent: Intent?, input: Triple<TapAndPayClient, PushTokenizeRequest, Int>): Pair<Int, Intent?> {
        // 返回自定义标识和结果Intent
        return input.third to (if (resultCode == Activity.RESULT_OK) intent else null)
    }
}

之后在Launcher回调中，根据返回的标识区分不同请求的结果即可。

内容的提问来源于stack exchange，提问作者Vahé Khachaturian