Android中onBackPressed()方法未触发问题求助

我在测试一个小型Android应用时，需要在按下返回键时执行特定操作，用Kotlin重写了onBackPressed()方法：

override fun onBackPressed() {
    super.onBackPressed()
    println("onBackPressed CALLED")
}

但这个方法从未被调用，我肯定遗漏了某些细节，希望能得到解决建议。

原项目相关Activity代码 #

package me.soft.myapp

import ........

class ModifyActivity : AppCompatActivity() {
    private var sharedPreferences: SharedPreferences? = null
    private var constraintLayout: ConstraintLayout? = null
    .....

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_modify)

        sharedPreferences = getPreferences(MODE_PRIVATE)
        constraintLayout = findViewById(R.id.main)
        ......
    }


    override fun onStop() {
        super.onStop()
        println("onStop CALLED")
    }

    override fun onResume() {
        super.onResume()
        println("onResume CALLED")
    }

    override fun onDestroy() {
        super.onDestroy()
        println("onDestroy CALLED")
    }

    override fun onRestart() {
        super.onRestart()
        println("onRestart CALLED")
    }

    override fun onBackPressed() {
        super.onBackPressed()
        println("onBackPressed CALLED")
    }
}

为了复现问题，我新建了一个包含两个Activity的小型项目，问题依然存在。

MainActivity.kt代码 #

package me.soft.trybackbtnaction

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View

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


    fun fireSubActivity(view: View) {
        val intent = Intent(this, SubActivity::class.java).apply {}
        startActivity(intent)
    } /* End of fireSubActivity */
}

SubActivity.kt代码 #

package me.soft.trybackbtnaction

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

class SubActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_sub)
    }


    override fun onBackPressed() {
        super.onBackPressed()
        println("onBackPressed CALLED")
    }
}

AndroidManifest.xml代码 #

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="mib.software.trybackbtnaction">

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.TryBackBtnAction"
        tools:targetApi="31">
        <activity
            android:name=".SubActivity"
            android:exported="false"
            android:parentActivityName=".MainActivity" />
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

内容的提问来源于stack exchange，提问作者Michel