android - 액티비티 생명주기

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <Button
        android:id="@+id/btnDial"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="전화걸기" />
    <Button
        android:id="@+id/btnFinish"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="끝내기" />

</LinearLayout>

package com.example.it.myapplication8_8;

import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("액티비티 테스트 예제");
        android.util.Log.i("액티비티 테스트", "onCreate()");

        Button btnDial = (Button) findViewById(R.id.btnDial);
        btnDial.setOnClickListener(new View.OnClickListener() {
               @Override
               public void onClick(View v) {
                   Uri uri = Uri.parse("tel:010-1234-5678");
                   Intent intent = new Intent(Intent.ACTION_DIAL, uri);
                   startActivity(intent);
               }
         });

        Button btnFinish = (Button) findViewById(R.id.btnFinish);
        btnFinish.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        android.util.Log.i("액티비티 테스트", "onDestory()");
    }

    @Override
    protected void onPause() {
        super.onPause();
        android.util.Log.i("액티비티 테스트", "onPause()");
    }

    @Override
    protected void onRestart() {
        super.onRestart();
        android.util.Log.i("액티비티 테스트", "onRestart()");
    }

    @Override
    protected void onPostResume() {
        super.onPostResume();
        android.util.Log.i("액티비티 테스트", "onPostResume()");
    }

    @Override
    protected void onStart() {
        super.onStart();
        android.util.Log.i("액티비티 테스트", "onStart()");
    }

    @Override
    protected void onStop() {
        super.onStop();
        android.util.Log.i("액티비티 테스트", "onStop()");
    }
}