Decoding android core threading concepts on Thread, Runnable, Handler, Looper, MessageQueue, HandlerThread🧡

Devrath
6 min readSep 19, 2022

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πšƒπš‘πš›πšŽπšŠπšπšœ 🧢 πšŠπš›πšŽ 𝚞𝚜𝚎𝚍 𝚝𝚘 πš™πšŽπš›πšπš˜πš›πš– πš‹πšŠπšŒπš”πšπš›πš˜πšžπš—πš πšπšŠπšœπš”πšœ πš’πš— πšŠπš—πšπš›πš˜πš’πš. 𝙰 πš‹πšŠπšŒπš”πšπš›πš˜πšžπš—πš πšπšŠπšœπš” πšŒπšŠπš— πš‹πšŽ πšŠπš—πš’πšπš‘πš’πš—πš πšπš›πš˜πš– 𝚊 πšœπš’πš–πš™πš•πšŽ πšŒπš˜πš–πš™πšžπšπšŠπšπš’πš˜πš— 𝚝𝚘 𝚊 πšπš’πš–πšŽ-πšŒπš˜πš—πšœπšžπš–πš’πš—πš πš˜πš™πšŽπš›πšŠπšπš’πš˜πš—.

Table of contents

πŸ—‚οΈ Fundamentals of Threading

  • π™±πš˜πš›πš— πš‚πšπšŠπšπšŽ: πšƒπš‘πš’πšœ πš’πšœ πšŠπš•πšœπš˜ πšŒπšŠπš•πš•πšŽπš 𝚊 πš—πšŽπš  𝚜𝚝𝚊𝚝𝚎, π™°πš πšπš‘πš’πšœ πšπš’πš–πšŽ πšπš‘πšŽ πšπš‘πš›πšŽπšŠπš πš˜πš‹πš“πšŽπšŒπš πš’πšœ πšŒπš›πšŽπšŠπšπšŽπš πš‹πšžπš πš’πš πš’πšœ πš—πš˜πš πšŠπš•πš’πšŸπšŽ.
  • 𝚁𝚎𝚊𝚍𝚒 πš‚πšπšŠπšπšŽ: πš†πš‘πšŽπš— 𝚠𝚎 πšŒπšŠπš•πš• πšœπšπšŠπš›πš() πšπš‘πšŽ πšπš‘πš›πšŽπšŠπš πšŽπš—πšπšŽπš›πšœ πšπš›πš˜πš– πšπš‘πšŽ πš‹πš˜πš›πš— 𝚜𝚝𝚊𝚝𝚎 𝚝𝚘 πšπš‘πšŽ πš›πšŽπšŠπšπš’ 𝚜𝚝𝚊𝚝𝚎. π™·πšŽπš›πšŽ πš’πš πš–πš’πšπš‘πš πš‹πšŽ πš›πšžπš— πš’πš—πšœπšπšŠπš—πšπšŠπš—πšŽπš˜πšžπšœπš•πš’ πš˜πš› πš”πšŽπš™πš πš’πš— πšπš‘πšŽ πšπš‘πš›πšŽπšŠπš πš™πš˜πš˜πš• πšπšŽπš™πšŽπš—πšπš’πš—πš πš˜πš— πšπš‘πšŽ πšπš‘πš›πšŽπšŠπš πšœπšŒπš‘πšŽπšπšžπš•πšŽπš› πš’πš–πš™πš•πšŽπš–πšŽπš—πšπšŠπšπš’πš˜πš—.
  • πšπšžπš—πš—πš’πš—πš πš‚πšπšŠπšπšŽ: πšƒπš‘πšŽ πšœπšŒπš‘πšŽπšπšžπš•πšŽπš› πš™πš’πšŒπš”πšœ πš˜πš—πšŽ 𝚘𝚏 πšπš‘πšŽ πšπš‘πš›πšŽπšŠπšπšœ πšπš›πš˜πš– πšπš‘πšŽ πš›πšžπš—πš—πšŠπš‹πš•πšŽ πš™πš˜πš˜πš• 𝚘𝚏 πšπš‘πš›πšŽπšŠπšπšœ πšŠπš—πš πš–πšŠπš”πšŽπšœ πš’πš 𝚊 πš›πšžπš—πš—πš’πš—πš 𝚜𝚝𝚊𝚝𝚎. π™·πšŽπš›πšŽ πšπš‘πšŽ πš›πšžπš— πš–πšŽπšπš‘πš˜πš πš’πšœ πšŒπšŠπš•πš•πšŽπš πšŠπš—πš πšœπšπšŠπš›πšπšœ πšŽπš‘πšŽπšŒπšžπšπš’πš—πš.
  • πš‚πš•πšŽπšŽπš™πš’πš—πš πš‚πšπšŠπšπšŽ: π™·πšŽπš›πšŽ πšπš‘πšŽ πšπš‘πš›πšŽπšŠπš πš’πšœ πš’πš— 𝚊 πš‹πš•πš˜πšŒπš”πšŽπš 𝚜𝚝𝚊𝚝𝚎 πš‹πšŽπšŒπšŠπšžπšœπšŽ πšπš‘πšŽ πšœπš•πšŽπšŽπš™ πš–πšŽπšπš‘πš˜πš πš’πšœ πšŒπšŠπš•πš•πšŽπš πš˜πš› πš πšŠπš’πšπš’πš—πš πšπš˜πš› πšπš‘πšŽ πš›πšŽπšœπš˜πšžπš›πšŒπšŽ.
  • πšƒπšŽπš›πš–πš’πš—πšŠπšπšŽπš πš‚πšπšŠπšπšŽ: πš†πš‘πšŽπš— πšπš‘πšŽ πš›πšžπš— πš–πšŽπšπš‘πš˜πš πš’πšœ πšŒπš˜πš–πš™πš•πšŽπšπšŽπš πšπš‘πšŽ πšπšŽπš›πš–πš’πš—πšŠπšπšŽπš 𝚜𝚝𝚊𝚝𝚎 πš’πšœ πš›πšŽπšŠπšŒπš‘πšŽπš πšŠπš—πš πšπš‘πšŽ πšπšŠπšœπš” πš’πšœ πšŒπš˜πš–πš™πš•πšŽπšπšŽπš.

πš†πšŽ πšœπš‘πšŠπš•πš• πš—πš˜πš πšπš’πš πšπšŽπšŽπš™πšŽπš› πš’πš—πšπš˜ πšπš‘πšŽ πš•πš’πšπšŽ πšŒπš’πšŒπš•πšŽ πšŒπš˜πš—πšŒπšŽπš™πš πšœπš’πš—πšŒπšŽ 𝚠𝚎 πšžπš—πšπšŽπš›πšœπšπšŠπš—πš πšπš‘πšŽ πšŒπš›πšžπš‘ 𝚘𝚏 πšπš‘πš›πšŽπšŠπš πš•πš’πšπšŽπšŒπš’πšŒπš•πšŽ πš‘πšŠπš™πš™πšŽπš—πšœ

πŸ—‚οΈ Threading in android

π™Έπš— πšŠπš—πšπš›πš˜πš’πš πš πš‘πšŽπš— 𝚒𝚘𝚞 πšœπšπšŠπš›πš πšŠπš— πšŠπš™πš™ 𝚊 πš™πš›πš˜πšŒπšŽπšœπšœ πš’πšœ πšœπšπšŠπš›πšπšŽπš πšŠπš—πš 𝚊 πšπš‘πš›πšŽπšŠπš πš’πšœ πšŠπš•πš•πš˜πšŒπšŠπšπšŽπš πšπš˜πš› πš’πš. πš†πšŽ πšŒπšŠπš•πš• πš’πš πšπš‘πšŽ πš–πšŠπš’πš—-πšπš‘πš›πšŽπšŠπš πšŠπš—πš πšπš‘πšŽ πšžπš—πš’πššπšžπšŽπš—πšŽπšœπšœ 𝚘𝚏 πšπš‘πš’πšœ πšπš‘πš›πšŽπšŠπš πš’πšœ πšπš‘πšŠπš πš’πšœ πš—πš˜πš πšπšŽπš›πš–πš’πš—πšŠπšπšŽπš πšŠπš—πš πš πš’πš•πš• πš‹πšŽ πšŠπš•πš’πšŸπšŽ πšžπš—πšπš’πš• πšπš‘πšŽ πš™πš›πš˜πšŒπšŽπšœπšœ 𝚘𝚏 πšπš‘πšŽ πšŠπš™πš™ πš’πšœ πšŠπšŒπšπš’πšŸπšŽ. πš†πšŽ πšœπš‘πšŠπš•πš• πšžπš—πšπšŽπš›πšœπšπšŠπš—πš πš’πš— πšπšŽπšπšŠπš’πš• πš’πš— πšπš‘πš’πšœ πšŠπš›πšπš’πšŒπš•πšŽ πš‘πš˜πš  πšπš‘πš’πšœ πšπšžπš—πšŒπšπš’πš˜πš—πšœ.

πŸ—‚οΈ Getting familiar with terminologies message-queue, handler, looper

πšƒπš‘πšŽπšœπšŽ πšŠπš›πšŽ πšπš‘πšŽ πšŒπš•πšŠπšœπšœπšŽπšœ πšπš‘πšŠπš πšπš‘πšŽ πšŠπš—πšπš›πš˜πš’πš πšπš›πšŠπš–πšŽπš πš˜πš›πš” πš’πšœ πš‹πšŽπš’πš—πš πš‹πšžπš’πš•πš πšžπš™πš˜πš— πšŠπš—πš πš™πš›πš˜πšŸπš’πšπšŽπš πš‹πš’ πšŠπš—πšπš›πš˜πš’πš 𝚝𝚘 πš–πšŠπš—πšŠπšπšŽ 𝚊 πšπš‘πš›πšŽπšŠπš πšŠπš—πš πšπš‘πšŽ πšπšŠπšœπš”πšœ πšπš‘πšŠπš πš›πšžπš— πš˜πš— πš’πš.

πŸ—‚οΈ Why do we need special classes to manage threading in android

  • πš†πšŽ πš”πš—πš˜πš  πšπš‘πšŠπš πšπš‘πš›πšŽπšŠπšπšœ πšŠπš›πšŽ 𝚞𝚜𝚎𝚍 𝚝𝚘 πš™πšŽπš›πšπš˜πš›πš– πšπš‘πšŽ πšπšŠπšœπš”πšœ πšŠπš—πš πšπš’πš—πš’πšœπš‘ πš‹πšžπš πšπš‘πšŽ πšŠπš—πšπš›πš˜πš’πš πšπš‘πš›πšŽπšŠπš 𝚊𝚜 πšπšŽπšœπšŒπš›πš’πš‹πšŽπš πšŠπš‹πš˜πšŸπšŽ πš”πšŽπšŽπš™πšœ πš’πšπšœπšŽπš•πš πšŠπš•πš’πšŸπšŽ πšŠπš—πš πšŠπš•πš•πš˜πš πšœ 𝚞𝚜 𝚝𝚘 πš™πšŽπš›πšπš˜πš›πš– πšŒπš˜πš—πšπš’πš—πšžπš˜πšžπšœ πšπšŠπšœπš”πšœ πšŽπš•πšœπšŽ 𝚠𝚎 πš πš˜πšžπš•πš πš‘πšŠπšŸπšŽ πšŽπš—πšπšŽπš πšžπš™ πšŒπš›πšŽπšŠπšπš’πš—πš 𝚊 πš•πšŠπš›πšπšŽ πšπš‘πš›πšŽπšŠπš πš™πš˜πš˜πš• πšœπš•πš˜πš πš’πš—πš πšπš˜πš πš— πšπš‘πšŽ πšŠπš™πš™πš•πš’πšŒπšŠπšπš’πš˜πš—.
  • π™²πš•πšŠπšœπšœπšŽπšœ πš•πš’πš”πšŽ 𝚊 πš‘πšŠπš—πšπš•πšŽπš›, πš•πš˜πš˜πš™πšŽπš›, πšŠπš—πš πš–πšŽπšœπšœπšŠπšπšŽ-𝚚𝚞𝚎𝚞𝚎 πš‘πšŽπš•πš™ 𝚝𝚘 πš–πšŠπš—πšŠπšπšŽ πšπš‘πšŽ πš–πšŠπš’πš— πšπš‘πš›πšŽπšŠπš πšŽπšπšπš’πšŒπš’πšŽπš—πšπš•πš’.

πŸ—‚οΈ Handler

  • π™·πšŠπš—πšπš•πšŽπš› πš•πšŽπšπšœ 𝚒𝚘𝚞 πšœπšŽπš—πš πšŠπš—πš πš™πš›πš˜πšŒπšŽπšœπšœ πš–πšŽπšœπšœπšŠπšπšŽπšœ πšŠπš—πš πš›πšžπš—πš—πšŠπš‹πš•πšŽ πš˜πš‹πš“πšŽπšŒπšπšœ πš πš‘πš˜ πšŠπš›πšŽ πšŠπšœπšœπš˜πšŒπš’πšŠπšπšŽπš πš πš’πšπš‘ πšπš‘πšŽ πš–πšŽπšœπšœπšŠπšπšŽ 𝚚𝚞𝚎𝚞𝚎.
  • π™½πš˜πšπšŽ πšπš‘πšŠπš 𝚊 πš‘πšŠπš—πšπš•πšŽπš› πš’πšœ πšŠπšœπšœπš˜πšŒπš’πšŠπšπšŽπš πš πš’πšπš‘ πš“πšžπšœπš πš˜πš—πšŽ πšπš‘πš›πšŽπšŠπš.
  • πšƒπš‘πš’πšœ 𝚊𝚍𝚍𝚜 πšπš‘πšŽ πš–πšŽπšœπšœπšŠπšπšŽ 𝚝𝚘 πšπš‘πšŽ 𝚚𝚞𝚎𝚞𝚎 πšŠπš—πš πš™πš›πš˜πšŒπšŽπšœπšœπšŽπšœ πšπš‘πšŽ πš–πšŽπšœπšœπšŠπšπšŽ πšπš›πš˜πš– πšπš‘πšŽ 𝚚𝚞𝚎𝚞𝚎.
  • πš†πš‘πšŽπš— 𝚊 πš‘πšŠπš—πšπš•πšŽπš› πš’πšœ πšŒπš›πšŽπšŠπšπšŽπš πš’πš πš’πšœ πš‹πš˜πšžπš—πš 𝚝𝚘 πšπš‘πšŽ πšπš‘πš›πšŽπšŠπš πšŠπš—πš πšπš‘πšŽ πš–πšŽπšœπšœπšŠπšπšŽ 𝚚𝚞𝚎𝚞𝚎 𝚘𝚏 πšπš‘πšŠπš πšπš‘πš›πšŽπšŠπš.
  • πš†πšŽ 𝚠𝚎 πš—πšŽπšŽπš 𝚝𝚘 𝚞𝚜𝚎 πšπš‘πšŽ πš‘πšŠπš—πšπš•πšŽπš› 𝚝𝚘 πšœπšŽπš—πš πšœπš˜πš–πšŽπšπš‘πš’πš—πš 𝚝𝚘 πš–πšŠπš’πš— πšπš‘πš›πšŽπšŠπš πšπš‘πšŽπš— 𝚠𝚎 πš—πšŽπšŽπš 𝚝𝚘 𝚞𝚜𝚎 πšπš‘πšŽ πš•πš˜πš˜πš™πšŽπš› 𝚘𝚏 πšπš‘πšŠπš πšπš‘πš›πšŽπšŠπš.

πŸ—‚οΈ Message Queue

  • πšƒπš‘πš’πšœ πš’πšœ 𝚊 πšœπš’πš–πš™πš•πšŽ 𝚚𝚞𝚎𝚞𝚎 πšœπš’πšœπšπšŽπš– πšπš‘πšŠπš πš‘πš˜πš•πšπšœ πšπš‘πšŽ πš–πšŽπšœπšœπšŠπšπšŽπšœ πšŠπš•πšœπš˜ πšŒπšŠπš•πš•πšŽπš πšπšŠπšœπš”πšœ πšπš‘πšŠπš πš‘πšŠπšŸπšŽ 𝚝𝚘 πš‹πšŽ πš™πš›πš˜πšŒπšŽπšœπšœπšŽπš.
  • πšƒπš‘πš’πšœ πš‘πšŽπš•πš™πšœ πš’πš— πš–πšŠπš’πš—πšπšŠπš’πš—πš’πš—πš 𝚊 πš•πš’πšœπš 𝚘𝚏 πšπšŠπšœπš”πšœ πšπš‘πšŠπš πšŠπš›πšŽ πš™πš›πš˜πšŒπšŽπšœπšœπšŽπš, π™΅πš˜πš› πšŽπš‘πšŠπš–πš™πš•πšŽ, 𝚜𝚊𝚒 𝚊 πšžπšœπšŽπš› πšŒπš•πš’πšŒπš”πšœ 𝟷𝟢 πšπš’πš–πšŽπšœ πš˜πš— πšπš‘πšŽ πšœπšŒπš›πšŽπšŽπš— πšŠπš•πš• πšπš‘πšŽ 𝟷𝟢 πšπšŠπšœπš”πšœ πšŠπš›πšŽ 𝚊𝚍𝚍𝚎𝚍 𝚊𝚜 𝟷𝟢 πš–πšŽπšœπšœπšŠπšπšŽπšœ πš’πš— πšπš‘πš’πšœ 𝚚𝚞𝚎𝚞𝚎 πš‹πš’ πšπš‘πšŽ πš‘πšŠπš—πšπš•πšŽπš› πšŠπš—πš πš™πš›πš˜πšŒπšŽπšœπšœπšŽπš πš‹πš’ πšπš‘πšŽ πš‘πšŠπš—πšπš•πšŽπš› πš˜πš—πšŽ πšŠπšπšπšŽπš› πšŠπš—πš˜πšπš‘πšŽπš› πšŠπšŸπš˜πš’πšπš’πš—πš 𝚊 πš›πšŠπšŒπšŽ πšŒπš˜πš—πšπš’πšπš’πš˜πš—.

πŸ—‚οΈ Looper

  • πšƒπš‘πšŽ πš•πš˜πš˜πš™πšŽπš› πš’πšœ 𝚞𝚜𝚎𝚍 𝚝𝚘 πš”πšŽπšŽπš™ πšπš‘πšŽ πšπš‘πš›πšŽπšŠπš πšŠπš•πš’πšŸπšŽ 𝚝𝚘 πš™πš›πš˜πšŒπšŽπšœπšœ πšŠπš•πš• πšπš‘πšŽ πš›πšžπš—πš—πšŠπš‹πš•πšŽ πšŠπšœπšœπš˜πšŒπš’πšŠπšπšŽπš πš πš’πšπš‘ 𝚊 πšπš‘πš›πšŽπšŠπš.
  • π™±πš’ πšπšŽπšπšŠπšžπš•πš, 𝚊 πšπš‘πš›πšŽπšŠπš πš‘πšŠπšœ πš•πš˜πš˜πš™πšŽπš› πšŠπšœπšœπš˜πšŒπš’πšŠπšπšŽπš πš πš’πšπš‘ πš’πš.
  • πš†πšŽ πš—πšŽπšŽπš 𝚝𝚘 πšŒπš›πšŽπšŠπšπšŽ 𝚊 πš•πš˜πš˜πš™πšŽπš› πš‹πš’ πšžπšœπš’πš—πš π™»πš˜πš˜πš™πšŽπš›. πš™πš›πšŽπš™πšŠπš›πšŽ(). πšƒπš‘πš’πšœ πš–πšŽπšπš‘πš˜πš πš’πšπšŽπš—πšπš’πšπš’πšŽπšœ πšπš‘πšŽ πšŒπšŠπš•πš•πš’πš—πš πšπš‘πš›πšŽπšŠπš πšŠπš—πš πšŒπš›πšŽπšŠπšπšŽπšœ 𝚊 πš•πš˜πš˜πš™πšŽπš› πšŠπš—πš πšπš‘πšŽ πš–πšŽπšœπšœπšŠπšπšŽ 𝚚𝚞𝚎𝚞𝚎 πšπš˜πš› πšπš‘πšŠπš πšπš‘πš›πšŽπšŠπš.
  • πš†πš‘πšŽπš— 𝚠𝚎 πšŒπšŠπš•πš• πšπš‘πšŽ π™»πš˜πš˜πš™πšŽπš›.πš•πš˜πš˜πš™(). πšƒπš‘πš’πšœ πš–πšŽπšπš‘πš˜πš πš’πšπšŽπš—πšπš’πšπš’πšŽπšœ πšπš‘πšŽ πšπš‘πš›πšŽπšŠπš πšŠπšœπšœπš˜πšŒπš’πšŠπšπšŽπš πš πš’πšπš‘ πšπš‘πšŽ πš•πš˜πš˜πš™πšŽπš› πšŠπš—πš πš”πšŽπšŽπš™πšœ πš’πš πšŠπš•πš’πšŸπšŽ πš’πš— πšŠπš— πš’πš—πšπš’πš—πš’πšπšŽ πš•πš˜πš˜πš™.
  • πšƒπš‘πšŽ πšπš‘πš›πšŽπšŠπš πš πš’πš•πš• πš”πšŽπšŽπš™ πš›πšžπš—πš—πš’πš—πš πš’πš— πš’πš—πšπš’πš—πš’πšπšŽ πšžπš—πšπš’πš• π™»πš˜πš˜πš™πšŽπš›.πššπšžπš’πš() πš’πšœ πšŒπšŠπš•πš•πšŽπš πš πš‘πš’πšŒπš‘ πš πš’πš•πš• 𝚌𝚊𝚞𝚜𝚎 πšπš‘πšŽ πš•πš˜πš˜πš™πšŽπš› 𝚝𝚘 πšŽπš‘πš’πš πšπš›πš˜πš– πšπš‘πšŽ πš’πš—πšπš’πš—πš’πšπšŽ πš•πš˜πš˜πš™.

Summary Handler+Looper+MessageQueue+Message

  • πšƒπš‘πšŽπš’ 𝚞𝚜𝚎 𝚊 πš–πšŽπšœπšœπšŠπšπšŽ 𝚚𝚞𝚎𝚞𝚎 πšπš‘πšŠπš πš‹πšŽπš•πš˜πš—πšπšœ 𝚝𝚘 𝚊 πšπš‘πš›πšŽπšŠπš πš•πšŽπšβ€™πšœ πšπšŠπš”πšŽ πšπš‘πšŽ πš„π™Έ πšπš‘πš›πšŽπšŠπš 𝚘𝚏 πšŠπš—πšπš›πš˜πš’πš.
  • 𝙰 πš•πš˜πš˜πš™πšŽπš› πšŠπšœπšœπš˜πšŒπš’πšŠπšπšŽπš πš πš’πšπš‘ πšπš‘πšŽ πšπš‘πš›πšŽπšŠπš πš”πšŽπšŽπš™πšœ πšπš‘πšŽ πšπš‘πš›πšŽπšŠπš πšŠπšŒπšπš’πšŸπšŽ.
  • πšƒπš‘πšŽπš›πšŽ πšŒπšŠπš— πš‹πšŽ πš–πšžπš•πšπš’πš™πš•πšŽ πš‘πšŠπš—πšπš•πšŽπš›πšœ πšŠπšœπšœπš˜πšŒπš’πšŠπšπšŽπš πš πš’πšπš‘ πšπš‘πšŽ πš•πš˜πš˜πš™πšŽπš›.
  • πšƒπš‘πšŽ πš‘πšŠπš—πšπš•πšŽπš›πšœ πšπš›πš˜πš™ πšπš‘πšŽ πš–πšŽπšœπšœπšŠπšπšŽπšœ πš’πš— πšπš‘πšŽ πš–πšŽπšœπšœπšŠπšπšŽ 𝚚𝚞𝚎𝚞𝚎.
  • πšƒπš‘πšŽ πš–πšŽπšœπšœπšŠπšπšŽπšœ πš’πš— πšπš‘πšŽ 𝚚𝚞𝚎𝚞𝚎 πšŠπš›πšŽ πšŽπš—πššπšžπšŽπšžπšŽπš πšŠπš—πš πšπšŽπš•πš’πšŸπšŽπš›πšŽπš 𝚝𝚘 πšπš‘πšŽ πš‘πšŠπš—πšπš•πšŽπš› πš πš‘πš’πšŒπš‘ πš’πšœ πšŠπšœπšœπš˜πšŒπš’πšŠπšπšŽπš πš πš’πšπš‘ πšπš‘πšŽ πš–πšŽπšœπšœπšŠπšπšŽ 𝚝𝚘 πš™πš›πš˜πšŒπšŽπšœπšœ πš’πš πš‹πšŠπšŒπš”.

πŸ—‚οΈ Threading example by extending the Thread class

  • π™·πšŽπš›πšŽ 𝚠𝚎 πšŽπš‘πšπšŽπš—πš 𝚊 πšŒπš•πšŠπšœπšœ πš‹πš’ πšƒπš‘πš›πšŽπšŠπš-πšŒπš•πšŠπšœπšœ πšŠπš—πš πš˜πšŸπšŽπš›-πš›πš’πšπšŽ πšπš‘πšŽ πš›πšžπš— πš–πšŽπšπš‘πš˜πš
  • πš†πšŽ πšœπšπšŠπš›πš πšπš‘πšŽ πšπš‘πš›πšŽπšŠπš πš‹πš’ πš’πš—πš’πšπš’πšŠπšπš’πš—πš threadReference.start()
  • πš†πšŽ πšπš‘πšŽπš— πšœπšπš˜πš™ πšπš‘πšŽ πšπš‘πš›πšŽπšŠπš πš‹πš’ πšŒπšŠπš•πš•πš’πš—πš threadReference.interrupt()

πŸ—‚οΈ Threading example by implementing Runnable

  • π™·πšŽπš›πšŽ 𝚠𝚎 πšπšŽπšπš’πš—πšŽ 𝚊 runnables πš‹πš’ πš’πš–πš™πš•πšŽπš–πšŽπš—πšπš’πš—πš πšπš‘πšŽ πš›πšžπš—πš—πšŠπš‹πš•πšŽ πš’πš—πšπšŽπš›πšπšŠπšŒπšŽ
  • πšƒπš‘πšŽπš— 𝚠𝚎 πšπšŽπšπš’πš—πšŽ 𝚊 thread πš’πš—πšœπšπšŠπš—πšŒπšŽ πš‹πš’ πš™πšŠπšœπšœπš’πš—πš πšπš‘πšŽ πš›πšžπš—πš—πšŠπš‹πš•πšŽ πš’πš— πšπš‘πšŽ πšŒπš˜πš—πšœπšπš›πšžπšŒπšπš˜πš›.
  • π™½πšŽπš‘πš, 𝚠𝚎 𝚞𝚜𝚎 πšπš‘πšŽ πšπš‘πš›πšŽπšŠπš πš›πšŽπšπšŽπš›πšŽπš—πšŒπšŽ πšŠπš—πš πš™πšŽπš›πšπš˜πš›πš– threadReference.start()
  • π™Έπš— πšπš‘πšŽ runnable 𝚠𝚎 πšœπšŽπš›πšŸπšŽ πš•πš˜πš—πš-πš›πšžπš—πš—πš’πš—πš πšπšŠπšœπš”πšœ.
  • πš†πšŽ πšπš‘πšŽπš— πšœπšπš˜πš™ πšπš‘πšŽ πšπš‘πš›πšŽπšŠπš πš‹πš’ πšŒπšŠπš•πš•πš’πš—πš threadReference.interrupt()

πŸ—‚οΈ Difference between extending the Thread class and implementing the Runnable interface

πš†πš‘πšŽπš— 𝚠𝚎 πšŽπš‘πšπšŽπš—πš πšπš‘πšŽ πšƒπš‘πš›πšŽπšŠπš πšŒπš•πšŠπšœπšœ, 𝚠𝚎 πšŒπšŠπš—β€™πš πšŽπš‘πšπšŽπš—πš πšŠπš—πš’ πš˜πšπš‘πšŽπš› πšŒπš•πšŠπšœπšœ πšŽπšŸπšŽπš— πš’πš 𝚠𝚎 πš›πšŽπššπšžπš’πš›πšŽ πšŠπš—πš πš†πš‘πšŽπš— 𝚠𝚎 πš’πš–πš™πš•πšŽπš–πšŽπš—πš πšπšžπš—πš—πšŠπš‹πš•πšŽ, 𝚠𝚎 πšŒπšŠπš— 𝚜𝚊𝚟𝚎 πšœπš™πšŠπšŒπšŽ πšπš˜πš› πš˜πšžπš› πšŒπš•πšŠπšœπšœ 𝚝𝚘 πšŽπš‘πšπšŽπš—πš πšŠπš—πš’ πš˜πšπš‘πšŽπš› πšŒπš•πšŠπšœπšœ πš’πš— πšπš‘πšŽ πšπšžπšπšžπš›πšŽ πš˜πš› πš—πš˜πš .

πŸ—‚οΈ Handler implementation with example

  • π™·πšŠπš—πšπš•πšŽπš› πš’πšœ 𝚊 πš–πšŽπšŒπš‘πšŠπš—πš’πšœπš– πšπš‘πšŠπš πšŠπš—πšπš›πš˜πš’πš πš™πš›πš˜πšŸπš’πšπšŽπšœ 𝚝𝚘 πšœπšŽπš—πš πšŠπš—πš πš™πš›πš˜πšŒπšŽπšœπšœ πšπš‘πšŽ πš–πšŽπšœπšœπšŠπšπšŽ/πš›πšžπš—πš—πšŠπš‹πš•πšŽ πš˜πš‹πš“πšŽπšŒπšπšœ πšŠπšœπšœπš˜πšŒπš’πšŠπšπšŽπš πš πš’πšπš‘ 𝚊 πšπš‘πš›πšŽπšŠπšβ€™πšœ πš–πšŽπšœπšœπšŠπšπšŽ 𝚚𝚞𝚎𝚞𝚎.
  • πš†πšŽ πš‘πšŠπšŸπšŽ πšœπšŽπšŽπš— πšπš‘πšŠπš πšπš‘πšŽπš›πšŽ πš’πšœ 𝚊 πš–πšŽπšœπšœπšŠπšπšŽ 𝚚𝚞𝚎𝚞𝚎 πš πš‘πšŽπš›πšŽ πšπš‘πšŽ πš›πšžπš—πš—πšŠπš‹πš•πšŽ πš’πšœ 𝚊𝚍𝚍𝚎𝚍 𝚝𝚘 πš‹πšŽ πš™πš›πš˜πšŒπšŽπšœπšœπšŽπš πšŠπš—πš πšπš‘πšŽ πš•πš˜πš˜πš™πšŽπš› πš”πšŽπšŽπš™πšœ πšπš‘πšŽ πšπš‘πš›πšŽπšŠπš πšŠπš•πš’πšŸπšŽ πš πš‘πš’πšŒπš‘ πš’πš πš’πšœ πšŠπšœπšœπš˜πšŒπš’πšŠπšπšŽπš πš πš’πšπš‘.
  • πšƒπš‘πšŽ πš›πš˜πš•πšŽ 𝚘𝚏 πšπš‘πšŽ πš‘πšŠπš—πšπš•πšŽπš› πš’πšœ 𝚝𝚘 𝚊𝚍𝚍 πšπš‘πšŽ πš–πšŽπšœπšœπšŠπšπšŽ 𝚝𝚘 πšπš‘πšŽ πš–πšŽπšœπšœπšŠπšπšŽ 𝚚𝚞𝚎𝚞𝚎 πšŠπš—πš πš™πš›πš˜πšŒπšŽπšœπšœ πšπš‘πšŽ πš–πšŽπšœπšœπšŠπšπšŽ πšπš›πš˜πš– πšπš‘πšŽ 𝚚𝚞𝚎𝚞𝚎.
  • πšƒπšŠπšœπš”πšœ πšŠπš›πšŽ 𝚊𝚍𝚍𝚎𝚍 𝚊𝚜 𝙡𝙸𝙡𝙾(π™΅πš’πš›πšœπš π™Έπš— π™΅πš’πš›πšœπš π™Ύπšžπš) 𝚜𝚘 πš’πš 𝚠𝚎 𝚊𝚍𝚍 πš–πšžπš•πšπš’πš™πš•πšŽ πšπšŠπšœπš”πšœ πš’πš—πšπš˜ πšπš‘πšŽ 𝚚𝚞𝚎𝚞𝚎 πšŠπš—πš πš—πšŽπš‘πš πš˜πš—πšŽ πšŠπšπšπšŽπš› πšŠπš—πš˜πšπš‘πšŽπš›, πšπš‘πšŽ πšπšŠπšœπš”πšœ πšŠπš›πšŽ πš™πš›πš˜πšŒπšŽπšœπšœπšŽπš πšπš›πš˜πš– πšπš‘πšŽ 𝚚𝚞𝚎𝚞𝚎.
  • π™Έπš 𝚒𝚘𝚞 πšœπšπšŠπš›πš 𝟹 πš›πšžπš—πš—πšŠπš‹πš•πšŽ πš˜πš—πšŽ πšŠπšπšπšŽπš› πšŠπš—πš˜πšπš‘πšŽπš› πšŠπš—πš πš πš‘πš’πš•πšŽ πšπš‘πšŽ πšπš’πš›πšœπš πš˜πš—πšŽ πš’πšœ πšŽπš‘πšŽπšŒπšžπšπš’πš—πš πšŠπš—πš πšπš‘πšŽ πš˜πšπš‘πšŽπš› 𝟹 πšŠπš›πšŽ πš’πš— πšπš‘πšŽ πš–πšŽπšœπšœπšŠπšπšŽ 𝚚𝚞𝚎𝚞𝚎 𝚝𝚘 πš‹πšŽ πšœπšπšŠπš›πšπšŽπš πš’πš 𝚒𝚘𝚞 πš’πš—πšπšŽπš›πš›πšžπš™πš πšπš‘πšŽ πšπš‘πš›πšŽπšŠπš πš πš‘πš’πšŒπš‘ πš’πšœ πšŒπšžπš›πš›πšŽπš—πšπš•πš’ πš›πšžπš—πš—πš’πš—πš πš˜πš—πš•πš’ πšπš‘πšŽ πšπš’πš›πšœπš πš›πšžπš—πš—πšŠπš‹πš•πšŽ πš’πšœ πš’πš—πšπšŽπš›πš›πšžπš™πšπšŽπš πš’πš— πš‹πšŽπšπš πšŽπšŽπš— πšŠπš—πš πšπš‘πšŽ πš›πšŽπš–πšŠπš’πš—πš’πš—πš 𝟸 πš πš’πš•πš• πšœπšπšŠπš›πš πšŠπš—πš πšœπšπš›πš˜πš™ πšπš’πš•πš• πšŒπš˜πš–πš™πš•πšŽπšπš’πš˜πš— πš˜πš—πšŽ πš‹πš’ πš˜πš—πšŽ.

πŸ—‚οΈ HandlerThread implementation with example

  • π™·πšŠπš—πšπš•πšŽπš›-πšπš‘πš›πšŽπšŠπš πš’πšœ 𝚊 πšœπš™πšŽπšŒπš’πšŠπš• πšπš’πš™πšŽ 𝚘𝚏 πšπš‘πš›πšŽπšŠπš πšπš‘πšŠπš πšŒπš˜πš–πšŽπšœ πš πš’πšπš‘ πš’πšπšœ πš˜πš πš— πš•πš˜πš˜πš™πšŽπš› πšŠπš—πš πš–πšŽπšœπšœπšŠπšπšŽ 𝚚𝚞𝚎𝚞𝚎.
  • πš†πš‘πšŽπš—πšŽπšŸπšŽπš› 𝚊 πšπšŠπšœπš”/πš›πšžπš—πš—πšŠπš‹πš•πšŽ πš’πšœ πš™πš˜πšœπšπšŽπš 𝚝𝚘 𝚊 πš‘πšŠπš—πšπš•πšŽπš› πšžπšœπš’πš—πš πšπš‘πšŽ πš™πš˜πšœπš, π™Έπš—πšπšŽπš›πš—πšŠπš•πš•πš’ πšπš‘πšŽ πš‘πšŠπš—πšπš•πšŽπš› πš™πš’πšŒπš”πšœ πšπš‘πš’πšœ πšžπš™ πšŠπš—πš 𝚊𝚍𝚍𝚜 πš’πš 𝚝𝚘 𝚊 πš–πšŽπšœπšœπšŠπšπšŽ 𝚚𝚞𝚎𝚞𝚎.
  • πšƒπš‘πšŽπš— πšπš‘πšŽ πš•πš˜πš˜πš™πšŽπš› πš•πš˜πš˜πš™πšœ πšπš‘πš›πš˜πšžπšπš‘ πšπš‘πš’πšœ πš–πšŽπšœπšœπšŠπšπšŽ 𝚚𝚞𝚎𝚞𝚎 πšŠπš—πš πšœπšŽπš—πšπšœ πšπš‘πšŽ πšπšŠπšœπš” πšπš˜πš› πšŽπš‘πšŽπšŒπšžπšπš’πš˜πš—.
  • πš‚πš˜ πšŽπšŠπšŒπš‘ πš‘πšŠπš—πšπš•πšŽπš› πš’πšœ πšŠπšœπšœπš˜πšŒπš’πšŠπšπšŽπš πš πš’πšπš‘ 𝚊 πš•πš˜πš˜πš™πšŽπš›.
  • πš†πš‘πšŽπš— 𝚒𝚘𝚞 πš™πšŠπšœπšœ πš›πšžπš—πš—πšŠπš‹πš•πšŽ 𝚝𝚘 πšπš‘πšŽ πš‘πšŠπš—πšπš•πšŽπš› πšπš‘πš›πšŽπšŠπš, πš’πš πš πš’πš•πš• πšœπšŽπš›πš’πšŠπš•πš•πš’ 𝚎𝚑𝚎𝚌𝚞𝚝𝚎 πš˜πš—πšŽ πšŠπšπšπšŽπš› πšŠπš—πš˜πšπš‘πšŽπš›.
  • π™·πšŠπš—πšπš•πšŽπš›-πšπš‘πš›πšŽπšŠπš πš˜πš—πšŒπšŽ πš•πšŠπšžπš—πšŒπš‘πšŽπš πš πš’πš•πš• πšŒπš˜πš—πšπš’πš—πšžπšŽ πšπš’πš•πš• πšŽπš‘πšŽπšŒπšžπšπš’πš˜πš— πšŽπšŸπšŽπš— πš’πš πš•πš˜πš˜πš™πšŽπš›.πššπšžπš’πš() πš’πšœ πšŒπšŠπš•πš•πšŽπš πš’πš— πšπš‘πšŽ πš–πš’πšπšπš•πšŽ 𝚘𝚏 πšŽπš‘πšŽπšŒπšžπšπš’πš˜πš—.
  • π™ΏπšŽπš›πšπš˜πš›πš–πš’πš—πš πš•πš˜πš˜πš™πšŽπš›.πššπšžπš’πš() πš πš’πš•πš• πšœπšπš˜πš™ πšπš‘πšŽ πš—πšŽπš  πš›πšžπš—πš—πšŠπš‹πš•πšŽ πš‹πšžπš πš—πš˜πš πšπš‘πšŽ πš˜πš—πšŽπšœ πšπš‘πšŠπš πšŠπš›πšŽ πšŠπš•πš›πšŽπšŠπšπš’ πš’πš— πš™πš›πš˜πšŒπšŽπšœπšœ.
  • π™Έπš πš–πšžπš•πšπš’πš™πš•πšŽ πš‘πšŠπš—πšπš•πšŽπš›-πšπš‘πš›πšŽπšŠπšπšœ πšŠπš›πšŽ πš›πšžπš—πš—πš’πš—πš, πšπš‘πšŽπš’ πš›πšžπš— πš’πš— πš™πšŠπš›πšŠπš•πš•πšŽπš• 𝚝𝚘 πšŽπšŠπšŒπš‘ πš˜πšπš‘πšŽπš›.

πŸ—‚οΈ Difference between handler and handler-thread

πš„πš—πš•πš’πš”πšŽ πš—πš˜πš›πš–πšŠπš• πš‘πšŠπš—πšπš•πšŽπš› πš πš‘πšŽπš›πšŽ 𝚠𝚎 πš–πšŠπš—πšžπšŠπš•πš•πš’ πš—πšŽπšŽπš 𝚝𝚘 πš πš›πš’πšπšŽ π™»πš˜πš˜πš™πšŽπš›.πš™πš›πšŽπš™πšŠπš›πšŽ() πšŠπš—πš π™»πš˜πš˜πš™πšŽπš›.πš•πš˜πš˜πš™(), π™Έπš— πšπš‘πšŽ πš‘πšŠπš—πšπš•πšŽπš›-πšπš‘πš›πšŽπšŠπš πšπš‘πšŽπšœπšŽ πšπš‘πš’πš—πšπšœ πš πš’πš•πš• πš‹πšŽ πš‘πšŠπš—πšπš•πšŽπš πš‹πš’ πšπšŽπšπšŠπšžπš•πš.

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