@Override
 public boolean onContextItemSelected(MenuItem item) {
   AdapterView.AdapterContextMenuInfo info =
       (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
   UMemo.DatabaseOneView(this, info.position);
   UMemo.DatabaseDelete(this, UMemo.string_id);
   UMemo.ListUpdate(memo, this, memoAdapter);
   UMemo.snackBar(view, "삭제되었습니다.");
   return super.onContextItemSelected(item);
 }
 @Override
 protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   UMemo = new UMemo();
   mContext = MainActivity.this;
   activity = MainActivity.this;
   // Toolbar S
   tb = (Toolbar) findViewById(R.id.toobars);
   setSupportActionBar(tb);
   getSupportActionBar().setDisplayHomeAsUpEnabled(true);
   // Toolbar F & DrawerLayout S
   drawer = (DrawerLayout) findViewById(R.id.drawerlayout);
   actiondt = new ActionBarDrawerToggle(this, drawer, R.string.app_name, R.string.app_name);
   drawer.setDrawerListener(actiondt);
   // DrawerLayout F & NavigationView S
   navi = (NavigationView) findViewById(R.id.navigation_view);
   navi.setNavigationItemSelectedListener(
       new NavigationView.OnNavigationItemSelectedListener() {
         @Override
         public boolean onNavigationItemSelected(MenuItem item) {
           switch (item.getItemId()) {
             case R.id.side1:
               Toast.makeText(MainActivity.this, "M", Toast.LENGTH_SHORT).show();
               break;
           }
           return true;
         }
       });
   // NavigationView F
   memoHelper = new MemoHelper(this); // Database S & F & ListView S
   list_memo = (ListView) findViewById(R.id.list_memo);
   memo = new ArrayList<memo>();
   memoAdapter = new MemoAdapter(this, memo);
   UMemo.DatabaseAllView(this, memoAdapter);
   list_memo.setAdapter(memoAdapter);
   registerForContextMenu(list_memo);
   // ListView F
   floating = (FloatingActionButton) findViewById(R.id.main_floating);
 }
 // ListView F
 public void Floating(View v) {
   UMemo.TextClear();
   UMemo.startActivity(this, MemoActivity.class, activity);
 }