How to get the absolute coordinates of a view

Question

I m trying to get the absolute screen pixel coordinates of the top left corner of a view  However  all methods I can find such as getLeft   and getRight   don t work as they all seem to be relative to the parent of the view  thus giving me 0  What is the proper way to do this   If it helps  this is for a  put the picture back in order  game  I want the user to be able to draw a box to select multiple pieces  My assumption is that the easiest way to do that is to getRawX   and getRawY   from the MotionEvent and then compare those values against the top left corner of the layout holding the pieces  Knowing the size of the pieces  I can then determine how many pieces have been selected  I realise I can use getX   and getY   on the MotionEvent  but as that returns a relative position that makes determining which pieces were selected more difficult   Not impossible  I know  but it seems unnecessarily complicated    Edit  This is the code I used to try to get the size of the holding container  as per one of the questions  TableLayout is the table which holds all the puzzle pieces   TableLayout tableLayout    TableLayout  findViewById R id tableLayout   Log d LOG TAG   Values     tableLayout getTop     tableLayout getLeft       Edit 2  Here is the code I ve tried  following more of the suggested answers   public int   tableLayoutCorners   new int 2          TableLayout tableLayout    TableLayout  findViewById R id tableLayout   tableLayout requestLayout    Rect corners   new Rect    tableLayout getLocalVisibleRect corners   Log d LOG TAG   Top left     corners top          corners left          corners right                      corners bottom    cells 4  getLocationOnScreen tableLayoutCorners   Log d LOG TAG   Values     tableLayoutCorners 0           tableLayoutCorners 1      This code was added after all the initialisation is done  The image has been divided up into a array of ImageViews  the cells   array  contained within a TableLayout  Cells 0  is the top left ImageView  and I picked cells 4  as it s somewhere in the middle and most definitely should not have coordinates of  0 0    The code shown above still gives me all 0s in the logs  which I really don t understand because the various puzzle pieces are correctly displayed   I tried public int for tableLayoutCorners and default visibility  both giving the same result    I don t know if this is significant  but the ImageViews are originally not given a size  The size of the ImageViews is determined during the initialisation automatically by the View when I give it an image to display  Could this contribute to their values being 0  even though that logging code is after they have been given an image and have automatically resized themselves  To potentially counter that  I added the code tableLayout requestLayout   as shown above  but that didn t help

User · Answer

Get Both View Position and Dimension on screen val viewTreeObserver  ViewTreeObserver   videoView viewTreeObserver       if  viewTreeObserver isAlive            viewTreeObserver addOnGlobalLayoutListener object   ViewTreeObserver OnGlobalLayoutListener               override fun onGlobalLayout                       Remove Listener                 videoView viewTreeObserver removeOnGlobalLayoutListener this                                      View Dimentions                 viewWidth   videoView width                  viewHeight   videoView height                     View Location                 val point   IntArray 2                  videoView post                       videoView getLocationOnScreen point     or getLocationInWindow point                      viewPositionX   point 0                      viewPositionY   point 1

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First Way   In Kotlin we can create a simple extension for view   fun View getLocationOnScreen    Point       val location   IntArray 2      this getLocationOnScreen location      return Point location 0  location 1       And simply get coordinates   val location   yourView getLocationOnScreen   val absX   location x val absY   location y     Second Way   The Second way is more simple    fun View absX    Int       val location   IntArray 2      this getLocationOnScreen location      return location 0     fun View absY    Int       val location   IntArray 2      this getLocationOnScreen location      return location 1      and simply get absolute X by view absX   and Y by view absY

User · Answer

Just in addition to the above answers  for the question where and when you should call getLocationOnScreen  For any information that is related to the view  will be available only after the view has been laid out created  on the screen  So to get the location put your code inside view post Runnable  which is called after view has been laid out  like this  view post new Runnable                  Override             public void run                        This code will run when view created and rendered on screen                    So as the answer to this question  you can put the code here                int   location   new int 2                  myView getLocationOnScreen location                  int x   location 0                  int y   location 1

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You can get a View s coordinates using getLocationOnScreen   or getLocationInWindow    Afterwards  x and y should be the top-left corner of the view  If your root layout is smaller than the screen  like in a Dialog   using getLocationInWindow will be relative to its container  not the entire screen   Java Solution  int   point   new int 2   view getLocationOnScreen point      or getLocationInWindow point  int x   point 0   int y   point 1        NOTE  If value is always 0  you are likely changing the view immediately before requesting location    To ensure view has had a chance to update  run your location request after the View s new layout has been calculated by using view post   view post    - gt           Values should no longer be 0     int   point   new int 2       view getLocationOnScreen point      or getLocationInWindow point      int x   point 0       int y   point 1             Kotlin Solution  val point   IntArray 2  view getLocationOnScreen point     or getLocationInWindow point  val  x  y    point      NOTE  If value is always 0  you are likely changing the view immediately before requesting location    To ensure view has had a chance to update  run your location request after the View s new layout has been calculated by using view post   view post          Values should no longer be 0     val point   IntArray 2      view getLocationOnScreen point     or getLocationInWindow point      val  x  y    point     I recommend creating an extension function for handling this      To use  call  val  x  y    view screenLocation  val View screenLocation get    IntArray       val point   IntArray 2      getLocationOnScreen point      return point     And if you require reliability  also add   view screenLocationSafe   x  y - gt  Log d      Use  x and  y here      fun View screenLocationSafe callback   Int  Int  - gt  Unit        post           val  x  y    screenLocation         callback x  y

User · Answer

Following Romain Guy s comment  here s how I fixed it  Hopefully it ll help anyone else who also had this problem   I was indeed trying to get the positions of the views before they had been laid out on the screen but it wasn t at all obvious that was happening  Those lines had been placed after the initilisation code ran  so I assumed everything was ready  However  this code was still in onCreate    by experimenting with Thread sleep   I discovered that the layout is not actually finalised until after onCreate   all the way to onResume   had finished executing  So indeed  the code was trying to run before the layout had finished being positioned on the screen  By adding the code to an OnClickListener  or some other Listener  the correct values were obtained because it could only be fired after the layout had finished     The line below was suggested as a community edit   please use onWindowfocuschanged boolean hasFocus

User · Answer

First you have to get the localVisible rectangle of the view  For eg   Rect rectf   new Rect       For coordinates location relative to the parent anyView getLocalVisibleRect rectf      For coordinates location relative to the screen display anyView getGlobalVisibleRect rectf    Log d  WIDTH            String valueOf rectf width      Log d  HEIGHT           String valueOf rectf height      Log d  left             String valueOf rectf left    Log d  right            String valueOf rectf right    Log d  top              String valueOf rectf top    Log d  bottom           String valueOf rectf bottom      Hope this will help

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Use This code to find exact X and Y cordinates     int   array   new int 2   ViewForWhichLocationIsToBeFound getLocationOnScreen array   if  AppConstants DEBUG      Log d AppConstants TAG   array  X       array 0       Y       array 1    ViewWhichToBeMovedOnFoundLocation setTranslationX array 0    21   ViewWhichToBeMovedOnFoundLocation setTranslationY array 1  - 165     I have added subtracted some values to adjust my view  Please do these lines only after whole view has been inflated

User · Answer

The accepted answer didn t actually tell how to get the location  so here is a little more detail  You pass in an int array of length 2 and the values are replaced with the view s  x  y  coordinates  of the top  left corner    int   location   new int 2   myView getLocationOnScreen location   int x   location 0   int y   location 1     Notes   Replacing getLocationOnScreen with getLocationInWindow should give the same results in most cases  see this answer   However  if you are in a smaller window like a Dialog or custom keyboard  then use you will need to choose which one better suits your needs  You will get  0 0  if you call this method in onCreate because the view has not been laid out yet  You can use a ViewTreeObserver to listen for when the layout is done and you can get the measured coordinates   See this answer

User · Answer

Use View getLocationOnScreen   and or getLocationInWindow

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Using a global layout listener has always worked well for me   It has the advantage of being able to remeasure things if the layout is changed  e g  if something is set to View GONE or child views are added removed   public void onCreate Bundle savedInstanceState         super onCreate savedInstanceState            inflate your main layout here  use RelativeLayout or whatever your root ViewGroup type is      LinearLayout mainLayout    LinearLayout   this getLayoutInflater   inflate R layout main  null             set a global layout listener which will be called when the layout pass is completed and the view is drawn      mainLayout getViewTreeObserver   addOnGlobalLayoutListener         new ViewTreeObserver OnGlobalLayoutListener               public void onGlobalLayout                      Remove the listener before proceeding                if  Build VERSION SDK INT  gt   Build VERSION CODES JELLY BEAN                        mainLayout getViewTreeObserver   removeOnGlobalLayoutListener this                    else                       mainLayout getViewTreeObserver   removeGlobalOnLayoutListener this                                       measure your views here                                    setContentView mainLayout

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My utils function for get view location  it will return a Point object with x value and y value  public static Point getLocationOnScreen View view       int   location   new int 2       view getLocationOnScreen location       return new Point location 0   location 1        Using  Point viewALocation   getLocationOnScreen viewA

[android] How to get the absolute coordinates of a view

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