Unit -04 Using Built-in View Container Classes

Lesson Plan: Unit - 04
Subject: P15A2AAD - Android Application Development
Topic of Study: Using Built-in View Container Classes
Grade/Level: Master of Computer Applications
Objective: To demonstrate different built-in View Container Classes
Time Allotment: 55 Minutes

• Using Built-in View Container Classes
• Layouts are not the only controls that can contain other View objects.
• These View objects encapsulate other, simpler View types and give the user some interactive ability to browse the child View objects in a standard fashion.
• The types of ViewGroup containers built-in to the Android SDK framework include
• Lists, grids, and galleries
• Switchers with ViewFlipper, ImageSwitcher, and TextSwitcher
• Tabs with TabHost and TabControl
• Scrolling with ScrollView and HorizontalScrollView
• Hiding and showing content with the SlidingDrawer
• Using Data-Driven Containers:
• Some of the View container controls are designed for displaying repetitive View objects in a particular way. 
• Exa.
• ListView: Contains a vertically scrolling, horizontally filled list of View objects, each of which typically contains a row of data; the user can choose an item to perform some action upon.
• GridView: Contains a grid of View objects, with a specific number of columns; this container is often used with image icons; the user can choose an item to perform some action upon.
• GalleryView: Contains a horizontally scrolling list of View objects, also often used with image icons; the user can select an item to perform some action upon.
• Adapter View:
• These containers are all types of AdapterView controls.
• An AdapterView control contains a set of child View controls to display data from some data source.
• An Adapter generates these child View controls from a data source.
• An Adapter reads data from some data source and provides a View object based on some rules, depending on the type of Adapter used.
• Types of Adapter:
• Adapter classes are the CursorAdapter and the ArrayAdapter.
• The CursorAdapter gathers data from a Cursor, whereas the ArrayAdapter gathers data from an array.
• A CursorAdapter is a good choice to use when using data from a database.
• The ArrayAdapter is a good choice to use when there is only a single column of data or when the data comes from a resource array.
• Exa. of Design
  
• Exa. of Output
  
• Step 01 : Demo of List View
  
• Step 02 : Demo of List View
  
• Using List Activity:
• The ListView control is commonly used for full-screen menus or lists of items from which a user selects.
• As such, you might consider using ListActivity as the base class for such screens. 
• Using the ListActivity can simplify these types of screens.
• First, to handle item events, you now need to provide an implementation in your ListActivity.
• For instance, the equivalent of onListItemClickListener is to implement the onListItemClick() method within your ListActivity
• Second, to assign an Adapter, you need a call to the setListAdapter() method.
• Exa. of Design
  
• Exa. of Output
  
• Step 01: Demo of List Activity
  
• Step 02: Demo of List Activity
  
• Step 03: Demo of List Activity
  
• Organizing Screens with Tabs:
• The Android SDK has a flexible way to provide a tab interface to the user. 
• Much like ListView and ListActivity.
• There are two ways to create tabbing on the Android platform.
• You can either use the TabActivity, which simplifies a screen with tabs, or you can create your own tabbed screens from scratch. 
• Both methods rely on the TabHost control.
• Tab Host:
• Android TabHost  provides a nice way to present multiple thing on a Single Screen. 
• These  things are presented by Tabs.
• In order to use tabs we need to set 2 things to Tab…
• Tab Indicator : Text to show on Tab,  done by  setIndicator("Tab Name");
• TAB Content: The activity that will be opened when user selects/clicks particular tab, done by  setContent(activityObject);
• Exa.
• Step 01 : Select the Project.
• Step 02: Add Tabhost to Activity.
• Step 03: Just drag and drop that you want on tabs. It will create no of tabs as per controls.
• Step 04: Modify in Java file.
  
• Customized Tabs:
• Step 01: Create Project & Add TabHost control & add id=“@android:id/tabhost” & remove 3 tabs.
• Step 02: extends the activity…
• Exa.
  
• Step 03: Write a code & create a empty activities…
• Exa.
  
• Step 04: appends the tab…
• Exa.
  
• Step 05: Run your code.
• Exploring Other View Containers
• SlidingDrawer: 
• This control includes two parts: a handle and a container view. 
• The user drags the handle open and the internal contents are shown; then the user can drag the handle shut and the content disappears. 
• The SlidingDrawer can be used horizontally or vertically and is always used from within a layout representing the larger screen.
• Exa.
• Step 01: Design in XML
  
• Step 02: Write Code in .java
  
• View Switcher:
• In Android, ViewSwitcher is a sub class of ViewAnimator that is used for switching between views. 
• It is an element of transition widget which helps us to add transitions on the views. 
• It is mainly useful to animate a view on screen. 
• ViewSwitcher switches smoothly between two views (i.e. TextView, ImageView or any layout) and thus provides a way of transitioning from one view to another through appropriate animations. 
• You can create views for a ViewSwitcher widget either using a factory or by adding them on your own.
• Step 01 : Drag the ViewSwitcher in xml.
• Exa
  
• Step 02 : write a code in .java file
• Exa.
  
• Step 02 : write a code in .java file
• Exa.