액션바 ActionBar_Items

1. 액티비티는 베이직으로 생성한다.

2) 모듈을 추가해서 테스트. Basic Activity로 생성한다.

3) Menu 폴더에 있는 menu_main.xml을 편집한다.

drawable 폴더에 아이콘으로 사용할 이미지를 넣고 item에서 icon에 해당 이미지들을 연결해준다.

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context="com.progdv.actionbar_items.MainActivity">


    <item
        android:id="@+id/alarm"
        android:title="alarm"
        android:icon="@android:drawable/ic_lock_idle_alarm"
        app:showAsAction="always"/>

    <item
        android:id="@+id/new_game"
        android:title="New Game"
        android:icon="@drawable/new_game"
        app:showAsAction="always"/>

    <item
        android:id="@+id/play"
        android:title="play"
        android:icon="@drawable/play"
        app:showAsAction="always"/>


    <item
        android:id="@+id/action_settings"
        android:orderInCategory="100"
        android:title="@string/action_settings"
        app:showAsAction="never" />
</menu>

4) 화면 상단 액션바에 아이콘이 추가된 것을 확인할 수 있다.

5) Main_activity에 액션을 넣어준다.

package com.progdv.actionbar_items;

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });
    }

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

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        int id = item.getItemId(); // 현재 클릭된 객체의 아이디를 얻어와서
        // 이하에서 처리

        switch(id) {
            case R.id.alarm:
                Toast.makeText(getApplicationContext(), "Android Alarm", Toast.LENGTH_SHORT).show();
                return true;

            case R.id.new_game;
                Toast.makeText(getApplicationContext(), "New Game", Toast.LENGTH_SHORT).show();
                return true;
            case R.id.play;
                Toast.makeText(getApplicationContext(), "Play", Toast.LENGTH_SHORT).show();
                return true;
            case R.id.action_settings;
                Toast.makeText(getApplicationContext(), "Setting", Toast.LENGTH_SHORT).show();
                return true;
            // setting 하위 메뉴
            case R.id.hg:
            Toast.makeText(getApplicationContext(), "Hard", Toast.LENGTH_SHORT).show();
            return true;
            case R.id.ng:
            Toast.makeText(getApplicationContext(), "Normal", Toast.LENGTH_SHORT).show();
            return true;
            case R.id.eg:
            Toast.makeText(getApplicationContext(), "Easy", Toast.LENGTH_SHORT).show();
            return true;

            default:
                return super.onOptionsItemSelected(item);
        }

    }
}