keyguardlock.reenableKeyguard()和DevicePolicyManager.locknow(

Question

我想知道

 KeyguardManager localKeyguardManager = (KeyguardManager)getSystemService("keyguard");
String str1 = getClass().toString();
  keyguardlock = localKeyguardManager.newKeyguardLock(str1);
  keyguardlock.reenableKeyguard(); 

和

mDPM = (DevicePolicyManager)getSystemService(Context.DEVICE_POLICY_SERVICE);
            mAM = (ActivityManager)getSystemService(Context.ACTIVITY_SERVICE);
            mDeviceAdminSample = new ComponentName(Controller.this, UnLockAdminReceiver.class);
            setContentView(R.layout.main);

Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN); intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, mDeviceAdminSample);
        intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION, "Additional text explaining why this needs to be added.");
        startActivity(intent); 
        mDPM.lockNow();

*用DevicePolicyManager锁定android的好处是什么，我还需要知道我们是否可以使用DevicePolicyManager解锁手机*

Answer 1

keyguardLock方法锁定屏幕，DevicePolicyManager locks方法锁定设备