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)); } }