多线程的使用

多线程实现方式

• Thread
• Handler + Runnable
• IntentService
• AsyncTask
• ThreadPoolExecutor

优缺点比较
Thread

image.png
image.png

Handler+Runnable

......
        runnable.run()
        runnable2.run()
        runnable3.run()
        runnable4.run()


......
   val runnable = Runnable { LogUtils.e("runnable1")
        sleep(3000)
    }

    val runnable2 =  Runnable{ LogUtils.e("runnable2") }

    val runnable3 = Runnable { LogUtils.e("runnable3") }

    val runnable4 = Runnable { LogUtils.e("runnable4") }

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AsyncTask

......
        task3().execute()
        task4().execute()
        task1().execute()
        task2().execute()
......
class task1() : AsyncTask<Void,Void,String>(){
        override fun doInBackground(vararg params: Void?): String {
            LogUtils.e("task1")
            sleep(3000)
            return ""
        }
    }

    class task2() : AsyncTask<Void,Void,String>(){
        override fun doInBackground(vararg params: Void?): String {
            LogUtils.e("task2")
            return ""
        }
    }

    class task3() : AsyncTask<Void,Void,String>(){
        override fun doInBackground(vararg params: Void?): String {
            LogUtils.e("task3")
            return ""
        }
    }

    class task4() : AsyncTask<Void,Void,String>(){
        override fun doInBackground(vararg params: Void?): String {
            LogUtils.e("task4")
            return ""
        }
    }

----------------------------------------------------------------------------------------------------
2021-03-31 14:03:40.756 19140-19177/com.polycents.scannernow E/日常打log: task3
2021-03-31 14:03:40.757 19140-19178/com.polycents.scannernow E/日常打log: task4
2021-03-31 14:03:40.757 19140-19177/com.polycents.scannernow E/日常打log: task1
2021-03-31 14:03:43.798 19140-19200/com.polycents.scannernow E/日常打log: task2

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