<?xml version="1.0" encoding="utf-8"?>
<manifest
  xmlns:android  = "http://schemas.android.com/apk/res/android"
  package        = "com.example.wenchen.helloworld" >
 <application
  android:icon   = "@mipmap/ic_launcher"
  android:label  = "@string/app_name"
  android:theme  = "@style/AppTheme" >
  <activity
   android:name  = ".MainActivity"
   android:label = "@string/home_page" >
   <intent-filter>
    <action android:name   = "android.intent.action.MAIN" />
    <category android:name = "android.intent.category.LAUNCHER" />
   </intent-filter>
  </activity>
  <activity android:name  = ".NextActivity"
            android:label = "@string/next_page" />
 </application>
</manifest>

Which Android application component runs in the background to perform long-running operations?

  Activity
  Broadcast Receiver
  Content Provider
  Service