将项目改为支持Kotlin
(如果项目本身就是kotlin项目，这一步可以忽略)
- 在项目的build.gradle的dependencies下面加上
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.6.0" （版本可以改变，后面肯定会更新.）
- 在module里的build.gradle加上
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
引入库
在module的build.gradle的dependencies加上
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.2'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.2'
两个简单使用例子
GlobalScope.launch(context = Dispatchers.IO) {
//延时一秒
delay(1000)
Log.e("MainActivity","launch");
}
//主动休眠两秒，防止 JVM 过快退出
Log.e("MainActivity","start");
Thread.sleep(2000)
Log.e("MainActivity","end");
// val time = measureTimeMillis {
GlobalScope.launch {
val asyncA = async {
delay(3000)
1
}
val asyncB = async {
delay(4000)
2
}
Log.e(MainActivity.javaClass.name,"msg:"+asyncA.await() + asyncB.await())
}
运行结果：
2022-06-07 17:46:59.152 8021-8021/com.laotie.test E/MainActivity: start
2022-06-07 17:47:00.161 8021-8065/com.laotie.test E/MainActivity: launch
2022-06-07 17:47:01.152 8021-8021/com.laotie.test E/MainActivity: end
2022-06-07 17:47:01.154 8021-8021/com.laotie.test E/com.laotie.test.MainActivity$Companion: time:
2022-06-07 17:47:05.168 8021-8067/com.laotie.test E/com.laotie.test.MainActivity$Companion: msg:12
