Android:设备管理:从服务启动设备管理

Question

我无法获得活动，允许用户授予权限的应用程序是一个设备管理员工作。

我的代码如下...

ComponentName comp = new ComponentName(this, CustomReceiver.class);

Intent i = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);

i.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, comp);
i.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION, "Explanation");

startActivity(i);

应用程序不会崩溃/报告异常。我能做错什么呢？

Answer 1

像这样的事情就行了

if (!mPolicy.isAdminActive()) {

    Intent activateDeviceAdminIntent =
        new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);

    activateDeviceAdminIntent.putExtra(
        DevicePolicyManager.EXTRA_DEVICE_ADMIN,
        mPolicy.getPolicyAdmin());

    // It is good practice to include the optional explanation text to
    // explain to user why the application is requesting to be a device
    // administrator. The system will display this message on the activation
    // screen.
    activateDeviceAdminIntent.putExtra(
        DevicePolicyManager.EXTRA_ADD_EXPLANATION,
        getResources().getString(R.string.device_admin_activation_message));

    startActivityForResult(activateDeviceAdminIntent,
        REQ_ACTIVATE_DEVICE_ADMIN);
}

也许你没有考虑到

mPolicy.getPolicyAdmin()

Answer 2

这里有一个关于如何做到这一点的明确示例(官方文档here和here缺少一些上下文)

//class that implements DeviceAdminReceiver, defined in the Manifest 
ComponentName deviceAdminCN = new ComponentName(context, DeviceAdminReceiverImpl.class) 

...

Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, deviceAdminCN);
intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION, "your explanation for the user here");
startActivityForResult(intent, YOUR_REQUEST_CODE);

Here is the reference class used in the official sample app.