Learning Android from scratch -- baseactivity and activitycollector

BaseActivity

import android.os.Bundle
import android.util.Log
import androidx.appcompat.app.AppCompatActivity

open class BaseActivity:AppCompatActivity() {
    

    override fun onCreate(savedInstanceState: Bundle?) {
    
        super.onCreate(savedInstanceState)
        Log.d("BaseActivity", javaClass.simpleName)
        ActivityCollector.addActivity(this)
    }

    override fun onDestroy() {
    
        super.onDestroy()
        ActivityCollector.removeActivity(this)
    }
}

ActivityCollector—— Exit the program anytime, anywhere

import android.app.Activity

object ActivityCollector {
    
    private val activities = ArrayList<Activity>()
    fun addActivity(activity: Activity) {
    
        activities.add(activity)
    }
    fun removeActivity(activity: Activity) {
    
        activities.remove(activity)
    }
    fun finishAll() {
    
        for (activity in activities) {
    
            if (!activity.isFinishing) {
    
                activity.finish()
            } }
        activities.clear()
        android.os.Process.killProcess(android.os.Process.myPid())
    }
}