Introduction FragmentManager help us to handle Android fragment trasaction between fragments. With Android fragment transaction we mean a sequence of steps to add, replace or remove fragments. FragmentManager interacts with Fragment which are within an Activity. A fragment can be created by following ways Static method Dynamic method Static Method [...]
The android:name attribute in the <fragment> specifies the Fragment class to instantiate in the layout. When the system creates this activity layout, it instantiates each fragment specified in the layout and calls the onCreateView() method for each one, to retrieve each fragment's layout. The system inserts the View returned by [...]
Introduction A bitmap is a digital image composed of a matrix of dots. When viewed at 100%, each dot corresponds to an individual pixel on a display. A bitmap can be acquired by loading a file, reading in a collection of bytes or even taking a photo from device camera. [...]
Introduction The Bitmap (android.graphics.Bitmap) class represents a bitmap image. You create bitmaps using the BitmapFactory (android.graphics.BitmapFactory) class. Bitmaps can be created using BitmapFactory from a resource, a file, or an InputStream. From file Pass path to the image to BitmapFactory.decodeFile() to load the image previously copied to the sdcard. The [...]
To get data from our other activity (Say SecondActivity) that is opened by an activity(Say MainActivity), use startActivityForResult(). SecondActivity send back result via intent. While sending back intent it will set the response using setResult() RESULT_OK : Result send is OK. RESULT_CANCELED : Activity cancel to send result. Finally in [...]
Primitive data types like string, integer, float, etc. can be passed through intents, by putting the data with unique key in intents and send it to another activity. To send Java class objects from one activity to another activity using the intent, object passing techniques are Serialization and Parcelable. Parcelable [...]
RecyclerView.ItemDecoration is used to decorate the children of a RecyclerView. RecyclerView is a ViewGroup, with each of its children representing an item in a list. With ItemDecoration you can easily modify the appearance of these child views. Methods in RecyclerView.ItemDecoration class are getItemOffsets() : Provides offset data onDraw() : Draws [...]
ItemAnimator class provides mechanism for animating child views. It can be used to animate adding, removing, modifying and moving a child view. If you want custom animations you can subclass ItemAnimator. DefaultItemAnimator class provide animations for basic operations like adding, removing and changing items Fade in and fade out (for [...]
Introducion A layout manager positions item views inside a RecyclerView and determines when to reuse item views that are no longer visible to the user. RecyclerView provides these built-in layout managers: LinearLayoutManager : Shows items in a vertical or horizontal scrolling list. GridLayoutManager : Shows items in a grid. StaggeredGridLayoutManager : [...]
CardView can represent the information in a card manner with a drop shadow called elevation and corner radius which looks consistent across the platform. It’s a kind of FrameLayout with a rounded corner background and shadow. We can easily design good looking UI when we combined CardView with RecyclerView. A CardView [...]