Service Example with Getting Running Services from the device

MyService.java:

 package com..demo;  import android.app.Service; import android.content.Intent; import android.os.IBinder; import android.support.annotation.Nullable; import android.widget.Toast;  public class MyService extends Service {     @Nullable     @Override     public IBinder onBind(Intent intent) {         return null;     }      @Override     public void onCreate() {         super.onCreate();         Toast.makeText(getApplicationContext(),         "service created",Toast.LENGTH_SHORT).show();     }      @Override     public int onStartCommand(Intent intent,  int flags,                                             int startId) {         Toast.makeText(getApplicationContext(),              "service started",Toast.LENGTH_SHORT).show();          return super.onStartCommand(intent, flags, startId);     }      @Override     public void onDestroy() {         super.onDestroy();         Toast.makeText(getApplicationContext(),               "service stopped",Toast.LENGTH_SHORT).show();      } }  

activity_main.java:

 <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     tools:context="com..demo.MainActivity">       <Switch         android:id="@+id/switch1"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_marginTop="27dp"         android:text="Switch"         android:layout_alignParentTop="true"         android:layout_centerHorizontal="true" />       </RelativeLayout> 
 
 
  
  
MainActivity.java:
  
 package com..demo;  import android.app.ActivityManager; import android.content.Intent; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.CompoundButton; import android.widget.Switch;  import java.util.List;  public class MainActivity extends AppCompatActivity {      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          ActivityManager am = (ActivityManager)                   this.getSystemService(ACTIVITY_SERVICE);          List<ActivityManager.RunningServiceInfo> rs =                    am.getRunningServices(Integer.MAX_VALUE);          Switch aSwitch=(Switch)findViewById(R.id.switch1);          for(ActivityManager.RunningServiceInfo runningServiceInfo:rs){              String sname = runningServiceInfo.service.getClassName();             Log.d("MainActivity",sname);              if(sname.equals("com..demo.MyService")){                 aSwitch.setChecked(true);             }         }           aSwitch.setOnCheckedChangeListener                (new CompoundButton.OnCheckedChangeListener() {             @Override             public void onCheckedChanged                   (CompoundButton compoundButton, boolean b) {                 Intent intent=                    new Intent(getApplicationContext(),MyService.class);                  if(b){                     startService(intent);                 }else{                     stopService(intent);                 }             }         });     }       }