android 9.0 激活设备管理器

/*

* 激活设备管理器

* packageName包名，className  对应Receiver的名称

*/

private void activeAdmin(String packageName,String className) {

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

        try {

ComponentName _componentName=new ComponentName(packageName,className);

mDPM.setActiveAdmin(_componentName,false);

} catch (RuntimeException e) {

            e.printStackTrace();

        }

    }

<receiver android:label="@string/app_name" android:name="xxxxx" android:permission="android.permission.BIND_DEVICE_ADMIN">

            <meta-data android:name="android.app.device_admin" android:resource="@xml/device_admin"/>

            <intent-filter>

                <action android:name="android.app.action.DEVICE_ADMIN_ENABLED"/>

            </intent-filter>

        </receiver>