Use of Frame Layout in a project - android

there are many question about "FrameLayout". But i need the exact use of this different from LinearLayout, RelativeLayout. And in a project when we have to use this?

FrameLayout is designed to block out an area on the screen to display a single item. Generally, FrameLayout should be used to hold a single child view, because it can be difficult to organize child views in a way that's scalable to different screen sizes without the children overlapping each other. You can, however, add multiple children to a FrameLayout and control their position within the FrameLayout by assigning gravity to each child, using the android:layout_gravity attribute.
LinearLayout arranges elements side by side either horizontally or vertically(rows vs columns).
RelativeLayout is a layout manager that helps you arrange your UI elements based on some rule. You can specify thisngs like: align this to parents left edge, place this to the left/right of this elements etc.
Check these links
http://logc.at/2011/10/18/when-to-use-linearlayout-vs-relativelayout/
http://developer.android.com/reference/android/widget/FrameLayout.html

Related

Implementation of two ListViews in a Frame Layout

i have very basic knowledge about the framelayout . i wants to implement two listviews in a One frame Layout plus and the condition is whenever i click any of list out of two list in a frame layout "the clicked list must get zoomed out to fill the screen".
This is not the correct way to do this, if you've read the FrameLayout doc you'd see this:
FrameLayout is designed to block out an area on the screen to display a single item. Generally, FrameLayout should be used to hold a single child view, because it can be difficult to organize child views in a way that's scalable to different screen sizes without the children overlapping each other. You can, however, add multiple children to a FrameLayout and control their position within the FrameLayout by assigning gravity to each child, using the android:layout_gravity attribute.
What you want to use is fragments.
I hope this helps.

Use of FrameLayout in Android

What is the exact use of FrameLayout in Android?
Where can we use it?
What is the difference between Frame and Relative layout?
LinearLayout arranges elements side by side either horizontally or vertically(rows vs columns).
RelativeLayout is a layout manager that helps you arrange your UI elements based on some rule. You can specify things like: align this to parents left edge, place this to the left/right of this elements etc.
AbsoluteLayout is for absolute positioning i.e. you can specify exact co-ordinates where the view should go.
FrameLayout allows placements along Z-axis. That is you can stack your view elements one above the other.
As per my opinion
RelativeLayout can use to make sure views lineup correctly in relation to each other.
FrameLayout is very similar except it's only using gravity to put display it's views (with no relation).
For more information, please check this official page:http://developer.android.com/guide/topics/ui/declaring-layout.html#CommonLayouts

Android Layouts, Table, Relative and Linear, i am confused in their differences

I have read many articles regarding layout, but I am still quitely confused. My questions are:
When to use relative layout? Example?
When to use table layout and why we can't use it instead of relative layout?
When to use linear layout?
I just need brief answers.
When use which layout?
I think It depends on your UI, and most important thing that how you create optimized layout.
From definition : -
LinearLayout – designed to display child View controls in a single row or column. This is a very handy layout method for creating forms.
RelativeLayout – designed to display child View controls in relation to each other. For instance, you can set a control to be positioned “above” or “below” or “to the left of” or “to the right of” another control, referred to by its unique identifier. You can also align child View controls relative to the parent edges.
TableLayout – designed to organize child View controls into rows and columns. Individual View controls are added within each row of the table using a TableRow layout View (which is basically a horizontally oriented LinearLayout) for each row of the table.
References :
Creating Efficient Layouts
Common Layout Objects
And most important Hierarchy Viewer
at first there is some confusion about these layouts but as you start playing with these three layouts u will get idea where to use what.. I worked on relative-layout the most.
Consider i want to use a widget always at bottom of screen then with table or linear layout this is not possible always.. without feeling screen other two can not make item at bottom but relative can do.use of any type of layout depends on your screen requirements.
I started out using relativelayout. But recently I've switched to using mostly linearlayout.
The reason is kind of hard to explain, but take this as an example: Say I want a layout that has two images centered in the middle of the screen. Both images should take up 1/4 of the screen width and 1/4 of the screen height. This is impossible to do with relativelayout assuming you want it to work exactly the same on all devices. But you can do this with Linearlayout. By creating vertical and horizontal parents, you can create "boxes". To accomplish this you must learn about weigthsum and weigth. Parent layouts should have the weigthsum attribute and children should have the weight attribute.
Anyway, my point: Relativelayout is easy to use but it's also deceptive. You may think that your layout will look exactly alike on all device, but most likely, they won't look alike. The reason for this is:
With relativelayout you must define size with either dp or px(assuming you don't fill parent or wrap content).
Different devices have different aspect ratios.
I hoped that helped in terms of understanding relative and linearlayout.

What is the difference between linear and relative layout?

What is the difference between linear and relative layout?
LINEAR LAYOUT ::
In a linear layout, like the name suggests, all the elements are
displayed in a linear fashion
Either Horizontally or Vertically and this behavior is set in
android:orientation which is an attribute of the node
LinearLayout.
Linear layouts put every child, one after the other, in a line,
either horizontally or vertically.
Click here ---- for --- Android Docs reference for linear layout
RELATIVE LAYOUT::
In a relative layout every element arranges itself relative to other
elements or a parent element.
It is helpful while adding views one next to other etc
With a relative layout you can give each child a LayoutParam that
specifies exactly where is should go, relative to the parent or
relative to other children.
Views are layered on top of each other in relative layout
Click here ---- for ---Android Docs reference for Relative layout
Optimization::Have a look at Optimizing Layout Hierarchies
The Fewer Views, the Better::
The number one goal for your layouts should be using the fewest number of Views possible. The fewer Views you have to work with, the faster your application will run. Excessive nesting of Views further slows down your application.
A RelativeLayout hierarchy will typically use fewer Views and have a flatter tree than a LinearLayout hierarchy. With LinearLayout, you must create a new LinearLayout every time you want to change the orientation of your views – creating additional Views and a more nested hierarchy. As a result, it is recommended that you first use RelativeLayout for any layout that has any complexity. There is a high probability you will reduce the number of Views – and the depth of your View tree – by doing so.
Linear layouts put every child, one after the other, in a line, either horizontally or vertically. With a relative layout you can give each child a LayoutParam that specifies exactly where is should go, relative to the parent or relative to other children.
From Android developer documentation: Common Layout Objects
LinearLayout
LinearLayout aligns all children in a single direction — vertically or horizontally, depending on how you define the orientation attribute.
RelativeLayout
RelativeLayout lets child views specify their position relative to the parent view or to each other (specified by ID)
difference is simple: in LinearLayout we arrange stuff in linear manner (one after another), and in RelativeLayout we can place stuff anywhere on screen.
=> Linear Layout is arranged as a list.
Rest they are similar in functionality.
One of the characteristic feature of LinearLayout in Android is use of a property called Weight, which app can specify using android:layout_weight.
This attribute assigns an "importance" value to a view in terms of how much space it should occupy on the screen.
On the other hand, RelativeLayout do not support weight or in other words, RelativeLayout does not pay attention to android:layout_weight. That's a property of LinearLayout.LayoutParams, but not of RelativeLayout.LayoutParams.
Linear Layouts
Linear Layouts are great for aligning views in rows and columns.
They are a good way to divide up one place using layout weights that will expand or shrink views depending on the size of the Display.
Relative Layouts
Relative Layouts are great for positioning elements relative to one another.
For example putting B below A or putting C in the lower left hand corner.Check the Screen shoot
Relative layout also make it easy to overlap views. For Example : view A is overlapping view B. Check the Screen-Shoot
RelativeLayout is more flexible than LinearLayout but if you have proper knowledge about LinearLayout you Can use that too.
For LinearLayout every attribute has a significant position hardcoded by the developer.
For RelativeLayout you can change the position by relating with others attribute.
The following link should explain visually how the layouts work "Visually"
http://www.droiddraw.org/
Add some components to the window and mess with layouts to see what happens this is how I learned what each one does.
In the relative layout ,all the content in the layout page is related to other contents in the example_layout.xml page
In the case of Linear Layout the elements are displayed in the linear format
The difference between linear and relative layout in android is that in linear layout, the "children" can be placed either horizontally or vertically, but, in relative layout, the children can be placed with relative distance from each other. This is the difference between linear and relative layouts.

What are the differences between LinearLayout, RelativeLayout, and AbsoluteLayout?

I am confused about the difference between LinearLayout, RelativeLayout, and AbsoluteLayout.
Could someone please tell me the exact differences between them?
LinearLayout means you can align views one by one (vertically/ horizontally).
RelativeLayout means based on relation of views from its parents and other views.
ConstraintLayout is similar to a RelativeLayout in that it uses relations to position and size widgets, but has additional flexibility and is easier to use in the Layout Editor.
WebView to load html, static or dynamic pages.
FrameLayout to load child one above another, like cards inside a frame, we can place one above another or anywhere inside the frame.
deprecated - AbsoluteLayout means you have to give exact position where the view should be.
For more information, please check this address https://developer.android.com/guide/topics/ui/declaring-layout#CommonLayouts
Definitions:
Frame Layout: This is designed to block out an area on the screen to display a single item.
Linear Layout: A layout that arranges its children in a single column or a single row.
Relative Layout: This layout is a view group that displays child views in relative positions.
Table Layout: A layout that arranges its children into rows and columns.
More Information:
FrameLayout
FrameLayout is designed to block out an area on the screen to display a single item. Generally, FrameLayout should be used to hold a single child view, because it can be difficult to organize child views in a way that's scalable to different screen sizes without the children overlapping each other. You can, however, add multiple children to a FrameLayout and control their position within the FrameLayout by assigning gravity to each child, using the android:layout_gravity attribute.
Child views are drawn in a stack, with the most recently added child on top. The size of the FrameLayout is the size of its largest child (plus padding), visible or not (if the FrameLayout's parent permits).
RelativeLayout
A RelativeLayout is a very powerful utility for designing a user interface because it can eliminate nested view groups and keep your layout hierarchy flat, which improves performance. If you find yourself using several nested LinearLayout groups, you may be able to replace them with a single RelativeLayout.
(Current docs here)
TableLayout
A TableLayout consists of a number of TableRow objects, each defining a row (actually, you can have other children, which will be explained below). TableLayout containers do not display border lines for their rows, columns, or cells. Each row has zero or more cells; each cell can hold one View object. The table has as many columns as the row with the most cells. A table can leave cells empty. Cells can span columns, as they can in HTML.
The width of a column is defined by the row with the widest cell in that column.
Note: Absolute Layout is deprecated.
LinearLayout : A layout that organizes its children into a single horizontal or vertical row. It creates a scrollbar if the length of the window exceeds the length of the screen.It means you can align views one by one (vertically/ horizontally).
RelativeLayout : This enables you to specify the location of child objects relative to each other (child A to the left of child B) or to the parent (aligned to the top of the parent). It is based on relation of views from its parents and other views.
WebView : to load html, static or dynamic pages.
For more information refer this link:http://developer.android.com/guide/topics/ui/layout-objects.html
LinearLayout - In LinearLayout, views are organized either in vertical or horizontal orientation.
RelativeLayout - RelativeLayout is way more complex than LinearLayout, hence provides much more functionalities. Views are placed, as the name suggests, relative to each other.
FrameLayout - It behaves as a single object and its child views are overlapped over each other. FrameLayout takes the size of as per the biggest child element.
Coordinator Layout - This is the most powerful ViewGroup introduced in Android support library. It behaves as FrameLayout and has a lot of functionalities to coordinate amongst its child views, for example, floating button and snackbar, Toolbar with scrollable view.
Great explanation here:
https://www.cuelogic.com/blog/using-framelayout-for-designing-xml-layouts-in-android
LinearLayout arranges elements side by side either horizontally or vertically.
RelativeLayout helps you arrange your UI elements based on specific rules. You can specify rules like: align this to parent’s left edge, place this to the left/right of this elements etc.
AbsoluteLayout is for absolute positioning i.e. you can specify exact co-ordinates where the view should go.
FrameLayout allows placements of views along Z-axis. That means that you can stack your view elements one above the other.

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