android - Android Studio 中 Android 应用的 Google Play 许可

Question

我正尝试在 Android Studio 中为一个用 Kotlin 编写的应用程序设置 Google Play 许可。我的目标是避免用户在未通过商店购买我的应用程序的情况下共享 APK 文件。

我尝试过的:

• 我试过跟踪他们的 documentation .这不是很有用。它跳过了许多细节，它并不是真正的教程。我无法使用它。

• 我看过 this问题，它确实有一个长而详细的类似教程的答案。但答案似乎早已过时。它会导致大量警告并以异常“Intent must be explicit”终止。

我的问题概括起来是:

我如何通过 Google 设置许可证检查，以便没有通过商店购买该应用程序的人无法安装它。这似乎是一件很常见的事情，尽管我找不到很多合适的答案。

Answer 1

以下是我在 2020 年的工作方式:

1. 打开 Android Studio。

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1. 点击工具 -> SDK 管理器

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1. 切换到SDK 工具标签

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1. 确保安装了 Google Play 许可库。如果未安装，请单击复选标记并单击应用。

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1. 在该屏幕上，您可以看到 Android SDK Location。复制该路径:

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1. 点击文件 -> 新建 -> 导入模块...:

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1. 粘贴您复制的路径，然后单击文本输入行右侧的小文件夹图标:

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1. 点击Android\Sdk\extras\google\market_licensing\library，然后点击确定:

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1. 点击下一步:

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1. 选中所有内容并单击完成:

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1. 现在你应该有一个 library项目中的文件夹:

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1. 右键单击 app然后点击打开模块设置:

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1. 点击依赖项:

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1. 点击加号按钮并选择3 Module Dependency:

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1. 检查library然后点击确定:

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1. 再次单击确定 并等待同步。

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1. 如果遇到错误

The minSdk version should not be declared in the android manifest file. You can move the version from the manifest to the defaultConfig in the build.gradle file.

转到 library > manifests > AndroidManifest.xml 并删除行 <uses-sdk android:minSdkVersion="3" android:targetSdkVersion="15" /> .

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1. 转到 Gradle Scripts > build.gradle(模块:库):

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1. 更改 minSdkVersion到 4 并更改 compileSdkVersion , buildToolsVersion和 targetSdkVersion根据需要，然后单击 Sync Now :

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1. 现在库已准备就绪，我们需要实际执行许可证检查。转到 MainActivity.kt .

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1. 您需要找到您的 Base 64 公钥并生成盐，如 this 所示。回答。我将引用该答案的必要部分，但将代码翻译成 Kotlin:

1.1 Your Base64 unique application key

How to get it:

a. Go to your developer console. Link.

b. If you haven't already created an application draft for your app, do it now.

c. Once you have created the draft, it is a good idea to upload your.apk as Alpha or Beta. Leave it unpublished.

d. Click Services & APIs

e. Scroll down and find YOUR LICENSE KEY FOR THIS APPLICATION

f. Copy the key into your app like this:

private const val BASE64_PUBLIC_KEY = "YOUR LICENSE KEY FOR THIS APPLICATION";

Make sure that there are no spaces.

1.2 A salt

a. What is a salt?

A salt is random data that is additional input when hashing apassword. They are used to defend against dictionary attacks andrainbow table attacks.

b. How do I get one?

This is a good link to generate a random salt. There should be exactly20 random integers, so put 20 in for the amount of random strings togenerate, each string should be 2 characters long (used for thisexample, it doesn't have to be). Check numeric digits, and checkIdentical strings are allowed. They can be negative numbers too. Tryto remove any redundancy, e.g. 00 -> 0, for the sake of consistency.

c. Where do I put the salt?

When declaring variables just put this code in, except with yourrandom salt.

private val SALT = byteArrayOf(YOUR RANDOM SALT COMMA SEPARATED 20 INTEGERS)

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1. 第 21 步中的变量应该添加到您的主要 Activity 类中。现在，您应该向主要 Activity 添加一些代码。它应该大致如下(注意 // TODO 评论):

import android.os.Bundle
import android.provider.Settings
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import com.google.android.vending.licensing.*
import kotlin.system.exitProcess

class MainActivity : AppCompatActivity()
{
    companion object
    {
        private const val BASE64_PUBLIC_KEY = "YOUR LICENSE KEY FOR THIS APPLICATION" // TODO replace with your own key

        private val SALT = byteArrayOf(YOUR RANDOM SALT COMMA SEPARATED 20 INTEGERS) // TODO replace with your own salt
        
    }
    
    private val deviceId: String by lazy {
        Settings.Secure.getString(getContentResolver(), Settings.Secure.ANDROID_ID);
    }
    private lateinit var licenseCheckerCallback: LicenseCheckerCallback
    private lateinit var checker: LicenseChecker
    
    private fun doCheck()
    {
        checker.checkAccess(licenseCheckerCallback)
    }

    override fun onDestroy()
    {
        super.onDestroy()
        checker.onDestroy()
    }



    override fun onCreate(savedInstanceState: Bundle?)
    {
        super.onCreate(savedInstanceState)

        // Construct the LicenseCheckerCallback. The library calls this when done.
        licenseCheckerCallback = MyLicenseCheckerCallback()

        // Construct the LicenseChecker with a Policy.
        checker = LicenseChecker(
            this,
            ServerManagedPolicy(this, AESObfuscator(SALT, packageName, deviceId)),
            BASE64_PUBLIC_KEY // Your public licensing key.
        )

        doCheck()

        setContentView(R.layout.activity_main) // TODO Replace with your own layout
    }

    private fun displayResult(result: String)
    {
         // TODO you can change this how the info is displayed
        Toast.makeText(this, result, Toast.LENGTH_SHORT).show()
    }

    private inner class MyLicenseCheckerCallback : LicenseCheckerCallback
    {
        override fun allow(reason: Int)
        {
            if (isFinishing)
            {
                // Don't update UI if Activity is finishing.
                return
            }
            // Should allow user access.
        }

        override fun applicationError(errorCode: Int)
        {
             // TODO handle the error your own way. Calling `dontAllow` is common.
            dontAllow(Policy.NOT_LICENSED)
        }

        override fun dontAllow(reason: Int)
        {
            if (isFinishing)
            {
                // Don't update UI if Activity is finishing.
                return
            }
            

            if (reason == Policy.RETRY)
            {
                // If the reason received from the policy is RETRY, it was probably
                // due to a loss of connection with the service, so we should give the
                // user a chance to retry. So show a dialog to retry.

                // TODO handle Policy.RETRY
            }
            else
            {
                // Otherwise, the user isn't licensed to use this app.
                // Your response should always inform the user that the application
                // isn't licensed, but your behavior at that point can vary. You might
                // provide the user a limited access version of your app or you can
                // take them to Google Play to purchase the app.

                // TODO implement goto market
            }
            displayResult("Not Licensed")
            
            // TODO you may not abort if you have some other way to handle the fail case
            abort()
        }
    }

    private fun abort()
    {
        finishAffinity()
        exitProcess(0) 
    }
}

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1. 将这些权限添加到您的 list 文件中:

<uses-permission android:name="android.permission.INTERNET"/>  
<uses-permission android:name="com.android.vending.CHECK_LICENSE"/>

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1. 如果您收到类似以下消息的异常:

Service Intent must be explicit: Intent { act=com.android.vending.licensing.ILicensingService }

应用 this 中的修复程序回答。

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1. 应该就这些了。查看answer我之前引用了更多信息。我希望这能为其他人节省一些时间。