Question

似乎有些DeviceAdmin功能已在Lollipop中被破坏，至少在我的Nexus 5上已被破坏。

这适用于KitKat，JellyBean和Ice Cream Sandwich

@Override
public void onPasswordFailed(Context context, Intent intent) {

    DevicePolicyManager policyManager = (DevicePolicyManager)context.getSystemService(Context.DEVICE_POLICY_SERVICE);
    if(policyManager != null){
        int attempts = policyManager.getCurrentFailedPasswordAttempts();
        Log.v("TAG", "Attempts = " + attempts);
    }
}

但是在使用Android 5.0 Lollipop的Nexus 5上，它会产生以下错误：

11-24 16:11:50.117  27053-27053/com.example.myapp E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.example.myapp, PID: 27053
    java.lang.RuntimeException: Unable to start receiver com.example.myapp.receivers.AdminReceiver: java.lang.NullPointerException: Attempt to read from field 'int android.content.pm.UserInfo.id' on a null object reference
            at android.app.ActivityThread.handleReceiver(ActivityThread.java:2586)
            at android.app.ActivityThread.access$1700(ActivityThread.java:144)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1355)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
     Caused by: java.lang.NullPointerException: Attempt to read from field 'int android.content.pm.UserInfo.id' on a null object reference
            at android.os.Parcel.readException(Parcel.java:1546)
            at android.os.Parcel.readException(Parcel.java:1493)
            at android.app.admin.IDevicePolicyManager$Stub$Proxy.getCurrentFailedPasswordAttempts(IDevicePolicyManager.java:2476)
            at android.app.admin.DevicePolicyManager.getCurrentFailedPasswordAttempts(DevicePolicyManager.java:1261)
            at com.example.myapp.receivers.AdminReceiver.onPasswordFailed(AdminReceiver.java:48)
            at android.app.admin.DeviceAdminReceiver.onReceive(DeviceAdminReceiver.java:417)
            at android.app.ActivityThread.handleReceiver(ActivityThread.java:2579)
            at android.app.ActivityThread.access$1700(ActivityThread.java:144)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1355)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

It's been reported as an issue in the L-preview as well.

我的问题是什么导致这种情况？

Answer 1

我有同样的错误然后我意识到它可能不适用于版本5.0及更高版本。所以我所做的是我正在以编程方式检查错误尝试次数。如果有人想要解锁模式或引脚，如果他输入错误然后接收器将捕获并调用passwordFailed（）方法。所以我在SharedPreference对象上创建并且我存储了调用的passwordFailed（）方法的数量。基于此我得到了一些错误的模式。我认为这是正确的方式与否我不知道。

DevicePolicyManger（）。getCurrentFailedPasswordAttempts崩溃应用程序

1 个答案: