class Mainactivity : AppCompatactivity() {
lateinit var playbutton : Button
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
playbutton = findViewById(R.id.play_button)
playbutton.setOnClicklistener {
val intent = Intent(this,Frame::class.java)
startactivity(intent)
}
}
} 显示错误未解决的参考 Java 我的进口:
import android.content.Intent
import android.os.Bundle
import android.widget.Button
import androidx.appcompat.app.AppCompatactivity