{"id":6155,"date":"2020-08-13T14:52:14","date_gmt":"2020-08-13T09:22:14","guid":{"rendered":"https:\/\/www.innovationm.com\/blog\/?p=6155"},"modified":"2023-01-20T18:55:17","modified_gmt":"2023-01-20T13:25:17","slug":"android-offline-handling","status":"publish","type":"post","link":"https:\/\/www.innovationm.com\/blog\/android-offline-handling\/","title":{"rendered":"Android Offline Handling"},"content":{"rendered":"

Android offline handling basically represents the local storage data handling when there is no internet connection to get the basic required information. If not handled, the screen will be out of data and result in a blank screen which ultimately affects the UI experience.<\/span><\/p>\n

There are two ways to handle local data :<\/span><\/p>\n

    \n
  1. NoSql\u00a0<\/span><\/li>\n
  2. SQL<\/span><\/li>\n<\/ol>\n

    NoSql<\/b><\/p>\n

    Storing data in NoSql format or JSON format is one of the approaches to handle data offline. PaperDB and better use of SharedPreferences are the two ways to store data in JSON format. Since SharedPreferences only stores the primitive data types, we can convert the class object into JSON string and store them.<\/span><\/p>\n

    SharedPreference <\/b>:\u00a0<\/span><\/p>\n

    val sharedPreferences = getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE)\r\nval editor = sharedPreferences.edit()\r\neditor.putString(\"key\", \"value\")\r\neditor.putInt(\"key\", 0)\r\neditor.putBoolean(\"key\", true)\r\neditor.putFloat(\"key\", 0.0f)<\/pre>\n
    # Storing class object into shared preferences<\/span><\/p>\n
     <\/p>\n
    val user = User(\r\n\u00a0\u00a0\u00a0name = etName.text.toString(),\r\n\u00a0\u00a0\u00a0address = etAddress.text.toString(),\r\n\u00a0\u00a0\u00a0phoneNo = etPhoneNumber.text.toString()\r\n)\r\nval userJson = Gson().toJson(user, User :: class.java)\r\neditor.putString(\"user\", userJson\u00a0 \")\r\neditor.apply()<\/pre>\n
    # Fetch Data from SharedPreference<\/span><\/p>\n
     <\/p>\n
    sharedPreferences.getBoolean(\"key\", false)\r\nsharedPreferences.getFloat(\"key\", 0.0f)\r\nsharedPreferences.getString(\"key\", null)\r\nsharedPreferences.getInt(\"key\", 0)\r\nval userJson = sharedPreferences.getString(\"user\", null)\r\nval user = Gson().fromJson<User>(userJson , User::class.java)\r\n\r\n\r\n<\/pre>\n
     <\/p>\n
    PaperDB<\/b><\/p>\n
    Paper’s aim is to provide a simple yet <\/span>fast<\/span><\/a> object storage option for Android. It allows us to use Java\/Kotlin classes as is: without annotations, factory methods, mandatory class extensions etc. Moreover adding or removing fields to data classes is no longer a pain \u2013 all data structure changes are handled automatically.<\/span><\/p>\n
     <\/p>\n
    Installing<\/b><\/p>\n
      \n
    1. add dependency in build.gradle(app) file <\/span>implementation<\/span><\/span>\n
      'io.paperdb:paperdb:2.7.1'<\/pre>\n<\/li>\n
    2. In Application class, add <\/span>Paper<\/span>.<\/span>init(context) <\/span>inside onCreate method<\/span><\/li>\n<\/ol>\n
      Operations<\/b><\/p>\n
      Paper.book()<\/span><\/p>\n
      \u00a0\u00a0\u00a0.write(<\/span>“user”<\/b>, <\/span>user<\/b>) \/\/ store and update data havingkey user\u2019<\/span><\/p>\n
      Paper.book().delete(<\/span>“user”<\/b>) \/\/ delete data having key user<\/span><\/p>\n
      Paper.book().contains(<\/span>“user”<\/b>) \/\/ checks whether user key is available in database<\/span><\/p>\n
      val <\/b>user = Paper.book()<\/span><\/p>\n
      \u00a0\u00a0\u00a0.read<User>(<\/span>“user”<\/b>) \/\/ fetch data having key user<\/span><\/p>\n
      SQL<\/b><\/p>\n
      The other approach to handle offline data to store data in table structured row and column. Data is manipulated with the help of queries.<\/span><\/p>\n
      SQLite<\/b><\/p>\n
      SQLite<\/b> is an open source SQL <\/span>database<\/b> that stores data to a text file on a device. <\/span>Android<\/b> comes in with built in <\/span>SQLite database<\/b> implementation. <\/span>SQLite<\/b> supports all the relational <\/span>database<\/b> features.<\/span><\/p>\n
      For more learnings go to <\/span>https:\/\/www.tutorialspoint.com\/android\/android_sqlite_database.htm<\/span><\/p>\n
      Room Database<\/b><\/p>\n
      It is a layer on the top of SQLite. Room Database takes care of complicated queries and operations. It used annotations for creating tables, defining characteristics of the column, operations on the table like insert, delete, create and update. To use Room, create an abstract class extending RoomDatabase.<\/span><\/p>\n
      Installing<\/b><\/p>\n
      Add dependencies\u00a0<\/span><\/p>\n
      implementation \"android.arch.persistence.room:runtime:1.1.1\"\r\n\r\nannotationProcessor \"android.arch.persistence.room:compiler:1.1.1\"<\/pre>\n
      For more learning goto<\/span><\/p>\n
      https:\/\/medium.com\/mindorks\/using-room-database-android-jetpack-675a89a0e942<\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
      Android offline handling basically represents the local storage data handling when there is no internet connection to get the basic required information. If not handled, the screen will be out of data and result in a blank screen which ultimately affects the UI experience. There are two ways to handle local data : NoSql\u00a0 SQL […]<\/p>\n","protected":false},"author":1,"featured_media":6156,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[533],"class_list":["post-6155","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-android","tag-android-offline-handling"],"yoast_head":"\nAndroid Offline Handling - InnovationM - Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.innovationm.com\/blog\/android-offline-handling\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Android Offline Handling - InnovationM - Blog\" \/>\n<meta property=\"og:description\" content=\"Android offline handling basically represents the local storage data handling when there is no internet connection to get the basic required information. 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