MainActivity.java

package com.halzhang.android.examples.lockscreenexample;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;


public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        startService(new Intent(this, MyService.class));
    }
}