How to force an entire layout View refresh

Question

I want to force the main layout resource view to redraw   refresh  in say the Activity onResume   method  How can I do this     By main layout view  I mean the one   R layout mainscreen  below  that is called in my Activity onCreate    like this -  protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout mainscreen

User · Answer

If you are going to create a custom view  make sure it is extending SurfaceView then  you can redraw it with method getHolder   lockCanvas    Here is an example  Canvas c   getHolder   lockCanvas    c drawText  quot Text quot   x  y  paint   getHolder   unlockCanvasAndPost c

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Otherwise you can try this also-  ViewGroup vg    ViewGroup  findViewById  R id videoTitleTxtView    vg removeAllViews     vg refreshDrawableState

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Not sure if it s good approach but I just call this each time   setContentView R layout mainscreen

User · Answer

Try this  view requestLayout

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Just set your content view in onresume  setContentView R layout yourview  inside onResume     Example    Override public void onResume    super onResume    setContentView R layout activity main    postIncomeTotals

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This appears to be a known bug

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Intent intent   getIntent    intent addFlags Intent FLAG ACTIVITY NO ANIMATION   finish    startActivity intent     This allows you to reload with theme changes and hides the animations

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To strictly answer the question  Use invalidate        public void invalidate      Since  API Level 1      Invalidate the whole view  If the view is visible  onDraw Canvas  will be called at some point in the future  This must be called from a UI thread  To call from a non-UI thread  call postInvalidate      ViewGroup vg   findViewById  R id mainLayout   vg invalidate        Now  when the Activity resumes  it makes every View to draw itself  No call to invalidate   should be needed  To apply the theme  make sure you do it before any View is drawn  i e   before setContentView R layout mainscreen       public void setTheme  int resid    Since  API Level 1      Set the base theme for this context  Note that this should be called before any views are instantiated in the Context  for example before calling setContentView View  or inflate int  ViewGroup      The API doc reference is here  http   developer android com reference android view ContextThemeWrapper html setTheme 28int 29  Since the onDraw   method works on already instantiated Views  setTheme will not work  I have no experience with themes myself  but two alternative options I can think are     call setTheme in onCreate   instead  or redo setContentView  R layout mainscreen   to force reinstantiate all the layout

User · Answer

Just call the activity again itself using the intent  For example to refresh the layout of MainActivity  do like this    startActivity new Intent MainActivity this  MainActivity class

User · Answer

Try this workaround for the theming problem    Override public void onBackPressed         NavUtils navigateUpTo this  new Intent this              MyNeedToBeRefreshed class

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Solution   Guys I tried all of your Solutions but they did not worked for me  I have to set setVisibility of EditText to VISIBLE and this EditText should be visible then in ScrollView  but I was unable to refresh root view to take effect   I solved my problem  when I need to refresh the view so I changed the ScrollView visibility to GONE and then again set it to VISIBLE to take effect and it worked for me  This is not the exact solution but it only worked    private void refreshView        mScrollView setVisibility View GONE       mScrollView setVisibility View VISIBLE

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I was having this problem as well but following Farhan s lead of using setContentView   I did just that  using setContentView   by itself was not enough however  I found that I had to repopulate all of my views with information  To fix this I just pulled all of that code out to another method  I called it build  and in my onCreate method I just call that build  Now whenever my event occurs that I want my activity to  refresh  I  just call build  give it the new information  which I pass in as parameters to build  and I have a refreshed activity

User · Answer

Try getWindow   getDecorView   findViewById android R id content  invalidate

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This is how i used to Refresh my layout   Intent intent   getIntent    intent setFlags Intent FLAG ACTIVITY CLEAR TOP   Intent FLAG ACTIVITY NEW TASK   Intent FLAG ACTIVITY NO ANIMATION   finish    startActivity intent

User · Answer

I don t know if this is safe or not but it worked for me  I kinda ran into this problem myself and tried invalidate   and requestLayout   but to no avail  So I just called my onCreate null  all over again and it worked  If this is unsafe please do let me know  Hope this helps someone out there

User · Answer

To clear a view extending ViewGroup  you just need to use the method removeAllViews    Just like this  if you have a ViewGroup called myElement      myElement removeAllViews

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Try recreate   it will cause this Activity to be recreated

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Calling invalidate   or postInvalidate   on the root layout apparently does NOT guarantee that children views will be redrawn  In my specific case  my root layout was a TableLayout and had several children of class TableRow and TextView  Calling postInvalidate    or requestLayout   or even forceLayout   on the root TableLayout object did not cause any TextViews in the layout to be redrawn   So  what I ended up doing was recursively parsing the layout looking for those TextViews and then calling postInvalidate   on each of those TextView objects   The code can be found on GitHub  https   github com jkincali Android-LinearLayout-Parser

[android] How to force an entire layout View refresh?

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