无法始终从其他活动启动DevicePolicyManager活动

Question

我有一些奇怪的问题。当我尝试从主活动启动DevicePolicyManager活动时，它会正确加载。但是，当我发出通知时，调用QuestionActivity（如果用户单击通知），然后尝试从QuestionActivity调用DevicePolicyManager活动，我得到（logcat）：

INFO/ActivityManager(104): Starting activity: Intent {
act=android.app.action.ADD_DEVICE_ADMIN
cmp=com.android.settings/.DeviceAdminAdd
(has extras) }
WARN/InputManagerService(104): Window already focused, ignoring focus
gain of:
com.android.internal.view.IInputMethodClient$Stub$Proxy@4514a2d0

什么也没出现。这对我来说很奇怪，因为我能够从QuestionActivity启动不同的Android OS活动：

//This works 
Intent intent = new Intent(Settings.ACTION_BLUETOOTH_SETTINGS);
startActivity(intent);

但是我无法使用：

启动DevicePolicyManager

//This works from main activity, but not from QuestionActivity
MyDeviceAdmin admin = new MyDeviceAdmin(this);
    Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
    intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN,
         admin.getDeviceAdminComponent());
    intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,
            "Additional text explaining why this needs to be added.");
    startActivityForResult(intent, 234234234); 

我会非常感激任何帮助，因为我完全陷入困境。