Android的DevicePolicyManager lockNow（） [英] Android DevicePolicyManager lockNow()

问题描述

我是新的Andr​​oid开发，这就是为什么我碰了壁。我想要一个应用程序运行作为一种服务，和显示器的短信。如果接收到特定的SMS消息时，它锁定在电话（好象锁定期限已过）。有点像一个远程锁定。

I'm new to Android development, that's why I hit a wall. I want an application to be running as a service, and monitors SMS. If a specific SMS message is received, it locks the phone (as if the lock period has expired). Kinda like a remote lock.

我用 DevicePolicyManager 来调用 lockNow（）方法。但是，它触发对上一部分 lockNow（）被称为一个错误。

I used the DevicePolicyManager to invoke the lockNow() method. However, it triggers an error right on the part lockNow() is called.

下面是对活动的样本code：

Here's the sample code on the Activity:

public class SMSMessagingActivity extends Activity {
    /** Called when the activity is first created. */

public static DevicePolicyManager mDPM;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mDPM = (DevicePolicyManager)getSystemService(Context.DEVICE_POLICY_SERVICE);                    

    }

    public static void LockNow(){
        mDPM.lockNow();
    }

}

我看了<一个href=\"http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/app/DeviceAdminSample.html\" rel=\"nofollow\">http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/app/DeviceAdminSample.html作为参考例。

谁能帮我？告诉我什么地方错了我的code？我需要一些调整，以使在模拟器或设备管理权限？

Can anyone help me? Show me what's wrong with my code? Do I have to tweak something to enable Administrative Rights on the emulator or device?

谢谢！

推荐答案

下面是从文档的内容：

主叫设备管理员必须已请求USES_POLICY_FORCE_LOCK才能够调用此方法;如果没有，安全异常将被抛出。

The calling device admin must have requested USES_POLICY_FORCE_LOCK to be able to call this method; if it has not, a security exception will be thrown.

因此​​，你应该做你的OnCreate以下内容：

Therefore, you should do the following in your oncreate:

ComponentName devAdminReceiver; // this would have been declared in your class body
// then in your onCreate
    mDPM = (DevicePolicyManager)getSystemService(Context.DEVICE_POLICY_SERVICE);
    devAdminReceiver = new ComponentName(context, deviceAdminReceiver.class);
//then in your onResume

boolean admin = mDPM.isAdminActive(devAdminReceiver);
if (admin)
    mDPM.lockNow();
else Log.i(tag,"Not an admin");

在一个侧面说明，你的榜样code是一个活动。结果
也就是说，你应该只使用一个广播接收器来实现的一切，监视短信。

On a side note, your example code is an activity.
That, and you should just use a broadcast receiver to implement everything and monitor sms.

下面是用于接收短信的API例如：

Here's an API example for receiving sms:

<一个href=\"http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/os/SmsMessageReceiver.html\" rel=\"nofollow\">http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/os/SmsMessageReceiver.html

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