When I copied some text in Android, How to get copied text from listener.

AndroidManifest.xml

<application ...>
    ...
    <service android:name=".ClipboardService"/>
</application>

ClipboardService.kt

class ClipboardService: Service() {

    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
        val mCm = getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
        mCm.addPrimaryClipChangedListener {
            val newClip: String? = mCm.primaryClip?.getItemAt(0)?.text.toString()
            toast(newClip ?: "No data")
        }

        return START_STICKY
    }

    override fun onBind(p0: Intent?): IBinder? = null
}

extendsionUtil.kt

inline fun Context.toast(text: String) {
    Toast.makeText(this, text, Toast.LENGTH_SHORT).show()
}

MainActivity.kt

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        startService(Intent(this, ClipboardService::class.java))
    }
}

https://developer.android.com/guide/topics/text/copy-paste