小编Dao*_*een的帖子

我如何通过PowerMock访问以下私有静态字段foo。我只想验证例如Foo不为null，并且无法通过添加getter来重构代码。

public class Bar{

   private static Foo foo = new Foo();


}

我尝试使用此方法，但它不起作用：

Foo foo = Whitebox.getInternalState(bar, "foo");

当我尝试运行用于指纹验证的示例应用程序时，将引发以下异常。

我尝试过的设备是：

三星S5（Android 6.0.1 API 23）

07-08 03:31:57.796 30558-30558/com.netfinitymedia.notubeapp W/System.err: java.security.InvalidAlgorithmParameterException: java.lang.IllegalStateException: At least one fingerprint must be enrolled to create keys requiring user authentication for every use
07-08 03:31:57.796 30558-30558/com.netfinitymedia.notubeapp W/System.err:     at android.security.keystore.AndroidKeyStoreKeyGeneratorSpi.engineInit(AndroidKeyStoreKeyGeneratorSpi.java:238)
07-08 03:31:57.796 30558-30558/com.netfinitymedia.notubeapp W/System.err:     at android.security.keystore.AndroidKeyStoreKeyGeneratorSpi$AES.engineInit(AndroidKeyStoreKeyGeneratorSpi.java:53)
07-08 03:31:57.796 30558-30558/com.netfinitymedia.notubeapp W/System.err:     at javax.crypto.KeyGenerator.init(KeyGenerator.java:189)
07-08 03:31:57.796 30558-30558/com.netfinitymedia.notubeapp W/System.err:     at com.netfinitymedia.notubeapp.authentication.VerificationActivity.generateKey(VerificationActivity.java:177)
07-08 03:31:57.796 30558-30558/com.netfinitymedia.notubeapp W/System.err:     at com.netfinitymedia.notubeapp.authentication.VerificationActivity.initialize(VerificationActivity.java:131)
07-08 03:31:57.796 30558-30558/com.netfinitymedia.notubeapp W/System.err:     at com.netfinitymedia.notubeapp.authentication.VerificationActivity.onCreate(VerificationActivity.java:63)
07-08 03:31:57.796 30558-30558/com.netfinitymedia.notubeapp W/System.err:     at android.app.Activity.performCreate(Activity.java:6876)
07-08 03:31:57.796 30558-30558/com.netfinitymedia.notubeapp W/System.err:     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135)
07-08 03:31:57.796 30558-30558/com.netfinitymedia.notubeapp W/System.err: …