Android LicenseChecker因空指针异常而崩溃 [英] Android LicenseChecker crashes with null pointer exception

问题描述

如果没有将Android手机登录到Google Play，似乎checkAccess调用将引发NullPointerException并最终导致应用程序崩溃：

It seems that if an Android phone is not logged in to Google Play, a checkAccess-call will throw a NullPointerException and eventually crash the application:

// user not logged in to Google Play
LicenseChecker licenseChecker = new LicenseChecker(...);
licenseChecker.checkAccess(...) // throws a nullpointer exception and crasches the app

NullPointerException发生在Android框架内部的单独线程中：

The NullPointerException happens deep inside the Android framework in a separate thread:

FATAL EXCEPTION: background thread
java.lang.NullPointerException
com.google.android.vending.licensing.LicenseValidator.verify()

因此，应用程序似乎无法捕获它并避免崩溃。

hence there seems no way for the application to catch it and avoid the crash.

任何想法如何避免此崩溃？ （应该是合法的情况，不要登录Google Play）

Any ideas how to avoid this crash? (t should be a legal situation not to be logged into Google Play)

我唯一想到的方法是在调用checkAccess之前检查Google Play登录状态。

The only way I can think of is to check Google Play login status prior to invoking checkAccess.

推荐答案

我修改了方法LicenseValidator.verify（），并在开头添加了保护检查：

I modified the method LicenseValidator.verify(), adding a protection check at the begining:

public void verify(PublicKey publicKey, int responseCode, String signedData, String signature) {
    if (signedData==null){
        handleInvalidResponse();
        return;
    }
    ...
}

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