安卓的生命周期（初学）

package com.example.proj3;


import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;


public class MainActivity extends Activity {
private final String TAG="Main";


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        TextView tv=new TextView(this);
        tv.setText("おやすみなさい！");
        setContentView(tv);
        
        Log.i(TAG, "OnCreate Method is executed!");//安卓的日志


    }
    
    @Override
    protected void onStart(){
    super.onStart();
    Log.i(TAG, "OnStart Method is executed!");//安卓的日志
    }
    @Override
    protected void onRestart(){
    super.onRestart();
    Log.i(TAG, "OnRestart Method is executed!");//安卓的日志
    }
    @Override
    protected void onResume(){
    super.onResume();
    Log.i(TAG, "OnResume Method is executed!");//安卓的日志
    }
    @Override 
    protected void onStop(){
    super.onStop();
    Log.i(TAG, "OnStop Method is executed!");//安卓的日志
    }
    @Override
    protected void onPause(){
    super.onPause();
    Log.i(TAG, "OnPause Method is executed!");//安卓的日志
    }
    @Override
    protected void onDestroy(){
    super.onDestroy();
    Log.i(TAG, "OnDestroy Method is executed!");//安卓的日志
    }
    


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}