기본 형태의 프로젝트 만들기-MainActivity.java

MainActivity.java

1. 파일의 빨강색으로 마킹한 부분 삭제/수정
2. ActionBarActivity > Activity 로 수정
3. 마우스 우클릭 > Source > Organize Imports

   

package kr.android.helloworld;     import android.support.v7.app.ActionBarActivity; import android.support.v7.app.ActionBar; import android.support.v4.app.Fragment; import android.os.Bundle; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.os.Build;     public class MainActivity extends ActionBarActivity {     @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);     if (savedInstanceState == null) { getSupportFragmentManager().beginTransaction() .add(R.id.container, new PlaceholderFragment()) .commit(); } }         @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); }     /** * A placeholder fragment containing a simple view. */ public static class PlaceholderFragment extends Fragment {     public PlaceholderFragment() { }     @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_main, container, false); return rootView; } }     }

   

최초 프로젝트 생성 후 MainActivity.java파일

   

기본 형태로 만든 MainActivity.java파일 내용