非启动器app如何开启kiosk模式？

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

DevicePolicyManager devicePolicyManager = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
ComponentName deviceAdmin = new ComponentName(this, DeviceAdminReceiver.class);
if (!devicePolicyManager.isAdminActive(deviceAdmin)) {
    Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
    intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, deviceAdmin);
    intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION, "Kiosk Mode");
    startActivityForResult(intent, REQUEST_CODE_ENABLE_ADMIN);
} else {
    // 已经是设备管理员，可以继续下一步
}

String[] kioskApps = { "com.example.kioskapp" };
devicePolicyManager.setLockTaskPackages(deviceAdmin, kioskApps);

startLockTask();