[iOS] Objective-c sharedApplication delegate, global @property

AppDelegate.h

#define appDelegate ((AppDelegate *)[[UIApplication sharedApplication] delegate])

@property (nonatomic, assign)NSInteger globalCount;

How to use?

[Android] ArrayList save HashMap

ArrayList<HashMap<String,String>> list = new ArrayList<HashMap<String,String>>();

//Save

for(int i=0;i<5;i++) {

        HashMap<String,String> tempMap = new HashMap<String,String>();

        String name = "server"+i;

        String mac = "11:22:33:44:55:6"+i;

        tempMap.put("DEVICE_NAME",name);

        tempMap.put("DEVICE_MAC",mac);

        peripheralScanResultList.add(tempMap);

}

//Get

for(HashMap<String, String> tempMap: peripheralScanResultList) {

        Iterator<String> iterator = tempMap.keySet().iterator();

        while( iterator.hasNext() ){

                String key=(String)iterator.next();

                String value=(String)tempMap.get(key);

                Log.i(TAG, key + ", " +value);

        }

}

[Android] SQLite execSQL, rawQuery

SQLiteDatabase db = dbHelper.getWritableDatabase();

a. Create table

 String INIT_TABLE = "CREATE TABLE IF NOT EXISTS " + tableName + " ("
                                     + _ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " 
                                     + field1 + " TEXT, "
                                     + field2 + " INTEGER, "
                                     + field3 + " VARCHAR );" ;

db.execSQL(INIT_TABLE);

b. Delete table

    try {

          db.execSQL("delete from "+ tableName);

    } catch (SQLException e) {

          Log.e("ERROR", e.toString());

    }

    

    db.close();