What is the difference between gravity and layout gravity in Android

Question

I know we can set the following values to the android gravity and  android layout gravity properties    center center vertical center horizontal  etc    But I am confused regarding both of these   What is the difference between the usage of android gravity and android layout gravity

User · Answer

Just thought I d add my own explanation here - coming from a background on iOS  this is how I ve internalized the two in iOS terms   Layout Gravity  affects your position in the superview   Gravity  affects the position of your subviews within you  Said another way  Layout Gravity positions you yourself while gravity positions your children

User · Answer

If a we want to set the gravity of content inside a view then we will use  android gravity   and if we want to set the gravity of this view  as a whole  within its parent view then we will use  android layout gravity

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Look at the image to be clear about gravity

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Their names should help you    android gravity sets the gravity of the contents  i e  its subviews  of the View it s used on    android layout gravity sets the gravity of the View or Layout relative to its parent      And an example is here

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gravity--Applies to its own view   layout-gravity---Applies to view related to its parent

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android gravity is used to specify how to place the content of the object within the object itself  In another word  android gravity is used to specify the gravity of the content of the view   android layout gravity is an attribution the child can supply to its parent  to specify the gravity the view within its parents   For more details you can visit      http   developer android com reference android widget LinearLayout LayoutParams html

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From what I can gather layout gravity is the gravity of that view inside its parent  and gravity is the gravity of the children inside that view   I think this is right but the best way to find out is to play around

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android gravity   is used to adjust for content of the view relative to its specify position  allocated area   android gravity  left   would not do anything if layout width is equal to the  wrap content   android layout gravity    is used for view itself relative to the parent or layout file

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The basic difference between the two is that-  android gravity is used for child elements of the view   android layout gravity is used for this element with respect to parent view

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An easy trick to remember this is gravity applies to us inside earth  So  android gravity is for inside the view   Rememeber the out in layout gravity which would help you to remember that android layout gravity would refer to outside the view

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There is many difference in the gravity and layout-gravity  I am going to explain my experience about these 2 concepts All information i got due to my observation and some websites       Use Of Gravity and Layout-gravity in FrameLayout         Note -    Gravity is used inside the View Content as some User have answer and it is same for all ViewGroup Layout   Layout-gravity is used with the parent View as some User have answer  Gravity and Layout-gravity is work more useful with the FrameLayout childs   We can t use Gravity and Layout-gravity in FrameLayout s Tag      We can set Child View any where in the FrameLayout using layout-gravity   We can use every single value of gravity inside the FrameLayout  eg - center vertical  center horizontal  center top  etc   but it is not possible with other ViewGroup Layouts    FrameLayout fully working on Layout-gravity   Example - If you work on FrameLayout then you don t need to change whole Layout for adding new View  You just add View as last in the FrameLayout and give him Layout-gravity with value  This is adavantages of layout-gravity with FrameLayout        have look on example            lt  xml version  1 0  encoding  utf-8   gt   lt FrameLayout xmlns android  http   schemas android com apk res android      android layout width  match parent      android layout height  match parent  gt        lt TextView         android layout width  match parent          android layout height  100dp          android textSize  25dp          android background   000          android textColor   264bd1          android gravity  center          android layout gravity  center          android text  Center Layout Gravity   gt        lt TextView         android layout width  wrap content          android layout height  80dp          android textSize  25dp          android background   000          android textColor   1b64b9          android gravity  bottom          android layout gravity  bottom center          android text  Bottom Layout Gravity    gt        lt TextView         android layout width  wrap content          android layout height  80dp          android textSize  25dp          android background   000          android textColor   d75d1c          android gravity  top          android layout gravity  top center          android text  Top Layout Gravity   gt        lt TextView         android layout width  wrap content          android layout height  80dp          android textSize  25dp          android background   000          android layout marginTop  100dp          android textColor   d71f1c          android gravity  top right          android layout gravity  top right          android text  Top Right Layout Gravity   gt         lt TextView         android layout width  wrap content          android layout height  80dp          android textSize  25dp          android background   000          android layout marginBottom  100dp          android textColor   d71cb2          android layout gravity  bottom          android gravity  bottom          android text  Top Left Layout Gravity   gt    lt  FrameLayout gt    Output -       Use Of Gravity and Layout-gravity in LinearLayout         Gravity working same as above but here differnce is that we can use Gravity inside the LinearLayout View and RelativeLayout View which is not possible in FrameLayout View      LinearLayout with orientation vertical        Note - Here we can set only 3 values of layout gravity that is  left   right   center  also called center horizontal        have look on example  -     lt  xml version  1 0  encoding  utf-8   gt   lt LinearLayout xmlns android  http   schemas android com apk res android      android layout width  match parent      android orientation  vertical      android layout height  match parent  gt        lt TextView         android layout width  wrap content          android layout height  100dp          android textSize  25dp          android background   000          android textColor   264bd1          android gravity  center          android layout gravity  center horizontal          android text  Center Layout Gravity  nor  nCenter Horizontal   gt        lt TextView         android layout width  wrap content          android layout height  80dp          android textSize  25dp          android background   000          android layout marginTop  20dp          android textColor   d75d1c          android layout gravity  right          android text  Right Layout Gravity   gt         lt TextView         android layout width  wrap content          android layout height  80dp          android textSize  25dp          android background   000          android layout marginBottom  100dp          android textColor   d71cb2          android layout gravity  left          android layout marginTop  20dp          android gravity  bottom          android text  Left Layout Gravity   gt    lt  LinearLayout gt    Output -       LinearLayout with orientation horizontal        Note - Here we can set also 3 values of layout gravity that is  top   bottom   center  also called center vertical        have look on example  -    lt  xml version  1 0  encoding  utf-8   gt   lt LinearLayout xmlns android  http   schemas android com apk res android      android layout width  match parent      android orientation  horizontal      android layout height  match parent  gt        lt TextView         android layout width  120dp          android layout height  100dp          android textSize  25dp          android background   000          android textColor   264bd1          android gravity  center          android layout gravity  bottom          android text  Bottom  nLayout  nGravity   gt        lt TextView         android layout width  120dp          android layout height  100dp          android textSize  25dp          android background   000          android layout marginTop  20dp          android textColor   d75d1c          android layout gravity  center          android text  Center  nLayout  nGravity   gt         lt TextView         android layout width  150dp          android layout height  100dp          android textSize  25dp          android background   000          android layout marginBottom  100dp          android textColor   d71cb2          android layout gravity  left          android layout marginTop  20dp          android text  Left  nLayout  nGravity   gt    lt  LinearLayout gt    output -     Note - We can t use layout gravity in the RelativeLayout Views but we can use gravity to set RelativeLayout childs to same position

User · Answer

Gravity  Allow you move the content inside a container   How sub-views will be placed    Important   MOVE along X-axis or Y-axis within available space    Example  Let s say if you were to work with LinearLayout  Height  match parent  Width  match parent  as root level element  then you will have full frame space available  and the child views says 2 TextViews  Height  wrap content  Width  wrap content  inside the LinearLayout can be moved around along x y axis using corresponding values for gravity on parent   Layout Gravity  Allow you to override the parent gravity behavior ONLY along x-axis   Important   MOVE override  along X-axis within available space    Example  If you keep in mind the previous example  we know gravity enabled us to move along x y axis  i e  the place TextViews inside LinearLayout  Let s just say LinearLayout specifies gravity  center  meaning every TextView needs to be center both vertically and horizontally  Now if we want one of the TextView to go left right   we can override the specified gravity behavior using layout gravity on the TextView   Bonus  if you dig deeper  you will find out that text within the TextView act as sub-view  so if you apply the gravity on TextView  the text inside the TextView will move around   the entire concept apply here too

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The android gravity sets the gravity  position  of the children whereas the android layout gravity sets the position of the view itself  Hope it helps

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Short Answer  use android gravity or setGravity   to control gravity of all child views of a container  use android layout gravity or setLayoutParams   to control gravity of an individual view in a container   Long story  to control gravity in a linear layout container such as LinearLayout or RadioGroup  there are two approaches   1  To control the gravity of ALL child views of a LinearLayout container  as you did in your book   use android gravity  not android layout gravity  in layout XML file or setGravity   method in code   2  To control the gravity of a child view in its container  use android layout gravity XML attribute  In code  one needs to get the LinearLayout LayoutParams of the view and set its gravity  Here is a code example that set a button to bottom in a horizontally oriented container   import android widget LinearLayout LayoutParams  import android view Gravity       Button button    Button  findViewById R id MyButtonId      need to cast to LinearLayout LayoutParams to access the gravity field LayoutParams params    LayoutParams button getLayoutParams     params gravity   Gravity BOTTOM  button setLayoutParams params     For horizontal LinearLayout container  the horizontal gravity of its child view is left-aligned one after another and cannot be changed  Setting android layout gravity to center horizontal has no effect   The default vertical gravity is center  or center vertical  and can be changed to top or bottom  Actually the default layout gravity value is -1 but Android put it center vertically    To change the horizontal positions of child views in a horizontal linear container  one can use layout weight  margin and padding of the child view    Similarly  for vertical View Group container  the vertical gravity of its child view is top-aligned one below another and cannot be changed  The default horizontal gravity is center  or center horizontal  and can be changed to left or right   Actually  a child view such as a button also has android gravity XML attribute and the setGravity   method to control its child views -- the text in it  The Button setGravity int  is linked to this developer android com entry

User · Answer

gravity  is used for simple views like textview  edittext etc   layout gravity  is used for current view only gravity in context of it s relative parent view like linear Layout or FrameLayout to make view in center or any other gravity of its parent

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android gravity -  Sets the gravity of the content of the View its used on   android layout gravity -  Sets the gravity of it s Parent s view or Layout

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Gravity is used to set text alignment in views but layout gravity is use to set views it self  Lets take an example if you want to align text written in editText then use gravity and you want align this editText or any button or any view then use layout gravity  So its very simple

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Something I saw on Sandip s blog that I almost missed  fixed my problem  He said layout gravity DOES NOT WORK WITH LinearLayout    If you re using a LinearLayout and the gravity settings are driving you nuts  like me   then switch to something else    I actually switched to a RelativeLayout then used layout alignParentLeft and layout alignParentRight on the 2 contained TextViews to get them on one line to go far left and far right

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The difference android layout gravity is the Outside gravity of the View  Specifies the direction in which the View should touch its parent s border  android gravity is the Inside gravity of that View  Specifies in which direction its contents should align  HTML CSS Equivalents  if you are coming from a web development background  Android                   CSS                                                                                                               android layout gravity    float android gravity           text-align  Easy trick to help you remember Take layout-gravity as  quot Lay-outside-gravity quot

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Inside - Outside   gravity arranges the content inside the view   layout gravity arranges the view s position outside of itself    Sometimes it helps to see a picture  too  The green and blue are TextViews and the other two background colors are LinearLayouts     Notes   The layout gravity does not work for views in a RelativeLayout  Use it for views in a LinearLayout or FrameLayout  See my supplemental answer for more details  The view s width  or height  has to be greater than its content  Otherwise gravity won t have any effect  Thus  wrap content and gravity are meaningless together  The view s width  or height  has to be less than the parent  Otherwise layout gravity won t have any effect  Thus  match parent and layout gravity are meaningless together  The layout gravity center looks the same as layout gravity center horizontal here because they are in a vertical linear layout  You can t center vertically in this case  so layout gravity center only centers horizontally  This answer only dealt with setting gravity and layout gravity on the views within a layout  To see what happens when you set the gravity of the of the parent layout itself  check out the supplemental answer that I referred to above   Summary  gravity doesn t work well on a RelativeLayout but can be useful with a LinearLayout     So remember  layout gravity arranges a view in its layout  Gravity arranges the content inside the view    xml  Here is the xml for the above image for your reference    lt  xml version  1 0  encoding  utf-8   gt   lt LinearLayout xmlns android  http   schemas android com apk res android      android layout width  match parent      android layout height  match parent      android orientation  vertical   gt        lt LinearLayout         android layout width  match parent          android layout height  0dp          android layout weight  1          android background   e3e2ad          android orientation  vertical   gt            lt TextView             android layout width  wrap content              android layout height  wrap content              android layout gravity  center horizontal              android textSize  24sp              android text  gravity     gt            lt TextView             android layout width  200dp              android layout height  40dp              android background   bcf5b1              android gravity  left              android text  left    gt            lt TextView             android layout width  200dp              android layout height  40dp              android background   aacaff              android gravity  center horizontal              android text  center horizontal    gt            lt TextView             android layout width  200dp              android layout height  40dp              android background   bcf5b1              android gravity  right              android text  right    gt            lt TextView             android layout width  200dp              android layout height  40dp              android background   aacaff              android gravity  center              android text  center    gt        lt  LinearLayout gt        lt LinearLayout         android layout width  match parent          android layout height  0dp          android layout weight  1          android background   d6c6cd          android orientation  vertical   gt            lt TextView             android layout width  wrap content              android layout height  wrap content              android layout gravity  center horizontal              android textSize  24sp              android text  layout gravity     gt            lt TextView             android layout width  200dp              android layout height  40dp              android layout gravity  left              android background   bcf5b1              android text  left    gt            lt TextView             android layout width  200dp              android layout height  40dp              android layout gravity  center horizontal              android background   aacaff              android text  center horizontal    gt            lt TextView             android layout width  200dp              android layout height  40dp              android layout gravity  right              android background   bcf5b1              android text  right    gt            lt TextView             android layout width  200dp              android layout height  40dp              android layout gravity  center              android background   aacaff              android text  center    gt        lt  LinearLayout gt    lt  LinearLayout gt    Related   Difference between a View s Padding and Margin Match parent vs wrap content How to set both gravity and layout gravity of a LinearLayout programatically

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