小编Abe*_*res的帖子

val masterKey =\n            MasterKey\n            .Builder(applicationContext)\n            .setKeyScheme(MasterKey.KeyScheme.AES256_GCM)\n            .build()\n

在即时应用程序中运行此代码会使我的应用程序崩溃，并显示以下堆栈跟踪：

2020-12-21 13:07:29.654 28949-28949/com.example.instantappandroidkeystore E/AndroidRuntime: FATAL EXCEPTION: main\n    Process: com.example.instantappandroidkeystore, PID: 28949\n    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.instantappandroidkeystore/com.example.instantappandroidkeystore.MainActivity}: java.lang.NullPointerException: Attempt to invoke interface method \'int android.security.keystore.IKeystoreService.exist(java.lang.String, int)\' on a null object reference\n        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3448)\n        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3595)\n        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)\n        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)\n        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)\n        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2147)\n        at android.os.Handler.dispatchMessage(Handler.java:107)\n        at android.os.Looper.loop(Looper.java:237)\n        at android.app.ActivityThread.main(ActivityThread.java:7814)\n        at java.lang.reflect.Method.invoke(Native Method)\n        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)\n        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1068)\n     Caused by: java.lang.NullPointerException: Attempt to invoke interface method \'int android.security.keystore.IKeystoreService.exist(java.lang.String, int)\' on a null …