在Android Studio(Java)中不能使用时间戳，当按钮被点击时，模拟器会向下呼喊

import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    private MediaPlayer mediaPlayer;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mediaPlayer = MediaPlayer.create(this, R.raw.sound_file);
    }

    public void playSound(View view) {
        if (mediaPlayer != null) {
            mediaPlayer.start();
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (mediaPlayer != null) {
            mediaPlayer.release();
            mediaPlayer = null;
        }
    }
}

public void onClickButton(View view) {
    long timestamp = System.currentTimeMillis();
    Log.d("Timestamp", String.valueOf(timestamp));
}