等待3秒Kotlin[重复]

Question

如何在此时等待3秒//等待3秒，然后继续

class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    val textreg = AnimationUtils.loadAnimation(this, R.anim.textreg);
    val text1 = findViewById(R.id.text1) as TextView

    text1.startAnimation(textreg);
    //wait 3sec
    text1.visibility = View.GONE
}

}

Answer 1

您可以运行协同程序，例如：

  GlobalScope.launch(Dispatchers.Main) {
        text1.startAnimation(textreg);
        delay(30000)
        text1.visibility = View.GONE
    }

或者你可以制作一个动画。3秒钟后，文本视图将开始消失。

<?xml version="1.0" encoding="utf-8"?>
<alpha xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="1000"
    android:fromAlpha="1"
    android:startOffset="3000"
    android:toAlpha="0" />

Answer 2

这可能回答了您的问题如何告诉函数在kotlin中等待几秒钟

Handler().postDelayed(Runnable { 
    //anything you want to start after 3s
    text1.visibility = View.GONE
}, 3000)