Android CoroutineScope Dispatchers.Main主线程delay，kotlin

ゝ一纸荒年。 2023-10-12 18:10 26阅读 0赞

![281a8cc76dea447f86b5e32a948edb4f.png][]

import androidx.appcompat.app.AppCompatActivity
    import android.os.Bundle
    import android.util.Log
    import android.view.View
    import android.view.View.OnClickListener
    import android.widget.Button
    import android.widget.Toast
    import kotlinx.coroutines.CoroutineScope
    import kotlinx.coroutines.Dispatchers
    import kotlinx.coroutines.delay
    import kotlinx.coroutines.launch
    
    class MainActivity : AppCompatActivity() {
        companion object {
            var TAG = "fly"
        }
    
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_main)
    
            //点击按钮正常弹出Toast
            findViewById<Button>(R.id.button).setOnClickListener(object : OnClickListener {
                override fun onClick(v: View?) {
                    Toast.makeText(
                        applicationContext,
                        TAG + " @${Thread.currentThread().id}",
                        Toast.LENGTH_SHORT
                    ).show()
                }
            })
    
            Log.d(TAG, "1 @${Thread.currentThread().id}")
            CoroutineScope(Dispatchers.Main).launch {
                delay(20_000)
                var id = Thread.currentThread().id
                Log.d(TAG, "launch @$id")
            }
            Log.d(TAG, "2 @${Thread.currentThread().id}")
        }
    }

[kotlin协程coroutineScope\_zhangphil的博客-CSDN博客coroutineScope 创建独立协程作用域，直到所有启动的协程都完成后才结束自己。runBlocking 和 coroutineScope 很像，它们都需要等待内部所有相同作用域的协程结束后才会结束自己。两者主要区别是： runBlocking 阻塞当前线程，而 coroutineScope不会，coroutineScope会挂起并释放底层线程供其它协程使用。kotlin协程coroutineScope。![favicon32.ico][]https://blog.csdn.net/zhangphil/article/details/129265638][kotlin_coroutineScope_zhangphil_-CSDN_coroutineScope _runBlocking _ coroutineScope _ runBlocking _ coroutineScope_coroutineScope_kotlin_coroutineScope_favicon32.ico_https_blog.csdn.net_zhangphil_article_details_129265638]

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[kotlin_coroutineScope_zhangphil_-CSDN_coroutineScope _runBlocking _ coroutineScope _ runBlocking _ coroutineScope_coroutineScope_kotlin_coroutineScope_favicon32.ico_https_blog.csdn.net_zhangphil_article_details_129265638]: https://blog.csdn.net/zhangphil/article/details/129265638