if ((dpm.getActiveAdmins() != null) && (dpm.isAdminActive(secureLock))) {
        Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
    intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, secureLock);
    intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,"is locked");
        dpm.lockNow();
        dpm.setMaximumTimeToLock(secureLock, 0);
    intent.putExtra("force-locked", DeviceAdminInfo.USES_POLICY_FORCE_LOCK);

    startActivityForResult(intent, Extra_Activity);
    } else {
    Log.d("The Device", "Could not lock because device admin not enabled");

    }

}`

<receiver
    android:description="@string/admin_app_description"
    android:label="@string/admin_app"
    android:name="app_class_name$MyAdmin"
    android:permission="android.permission.BIND_DEVICE_ADMIN" >
    <meta-data
        android:name="android.app.device_admin"
        android:resource="@xml/admin_app_resource" />

    <intent-filter >
        <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
    </intent-filter>
</receiver>

<uses-permission android:name="android.permission.DISABLE_KEYGUARD" >
</uses-permission>

<?xml version="1.0" encoding="UTF-8"?>
<device-admin xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <uses-policies>

        <force-lock />
    </uses-policies>

</device-admin>