Android Changing Background-Color of the Activity Main View

Question

I want to change the background color of my Main-View  not a Button or a Text-View  just the real background which is usually black    I got this code   view setBackgroundColor 0xfff00000     This is inside an OnClickListener  but it just changes the background of the Button

User · Answer

First Method    View someView   findViewById R id randomViewInMainLayout     get Any child View       Find the root view   View root   someView getRootView         Set the color   root setBackgroundColor getResources   getColor android R color red      Second Method  Add this single line after setContentView        getWindow   getDecorView   setBackgroundColor Color WHITE     Third Method   set background color to the rootView   lt  xml version  1 0  encoding  utf-8   gt   lt LinearLayout xmlns android  http   schemas android com apk res android  android orientation  vertical  android layout width  fill parent  android layout height  fill parent  android background   FFFFFF  android id    id rootView   lt  LinearLayout gt    Important Thing  rootView setBackgroundColor 0xFF00FF00     after 0x the other four pairs are alpha red green blue color

User · Answer

if you put your full code here so i can help you  if your setting the listener in XML and calling the set background color on View so it will change the background color of the view means it ur Botton so put ur listener in ur activity and then change the color of your view

User · Answer

Try creating a method in your Activity something like     public void setActivityBackgroundColor int color        View view   this getWindow   getDecorView        view setBackgroundColor color       Then call it from your OnClickListener passing in whatever colour you want

User · Answer

You can also try and provide an Id for the main layout and change the background of that through basic manipulation and retrieval  E g    lt LinearLayout xmlns android  http   schemas android com apk res android  xmlns tools  http   schemas android com tools  android id    id hello    Which can then be followed by accessing through R id hello     Pretty basic and I hope this does help

User · Answer

i don t know if it s the answer to your question but you can try setting the background color in the xml layout like this  It is easy  it always works   lt  xml version  1 0  encoding  utf-8   gt    lt LinearLayout xmlns android  http   schemas android com apk res android       android orientation  vertical       android layout width  fill parent       android layout height  fill parent    android background  0xfff00000      gt     lt TextView      android id    id text view       android layout width  fill parent       android layout height  wrap content       android text   string hello         gt      lt  LinearLayout gt    You can also do more fancy things with backgrounds by creating an xml background file with gradients which are cool and semi transparent  and refer to it for other use see example below   the background xml layout   lt  xml version  1 0  encoding  utf-8   gt   lt selector xmlns android  http   schemas android com apk res android  gt   lt item gt       lt shape gt           lt gradient             android angle  90              android startColor   f0000000              android endColor   ff444444              android type  linear    gt       lt  shape gt   lt  item gt   lt  selector gt    your layout   lt  xml version  1 0  encoding  utf-8   gt    lt LinearLayout xmlns android  http   schemas android com apk res android       android orientation  vertical       android layout width  fill parent       android layout height  fill parent    android background   layout background         gt     lt TextView      android id    id text view       android layout width  fill parent       android layout height  wrap content       android text   string hello         gt      lt  LinearLayout gt

User · Answer

Just add this below one line code in the XML file of that corresponding activity   android background   android color black     it will help you for sure

User · Answer

Try this   x000D   x000D   lt  xml version  1 0  encoding  utf-8   gt   lt androidx constraintlayout widget ConstraintLayout xmlns android  http   schemas android com apk res android      xmlns app  http   schemas android com apk res-auto      xmlns tools  http   schemas android com tools      android layout width  match parent      android layout height  match parent      tools context   MainActivity  gt   lt LinearLayout     android layout width  match parent      android layout height  match parent      android background   color colorPrimaryDark     lt  androidx constraintlayout widget ConstraintLayout gt        gt  x000D   x000D   x000D

User · Answer

I just want to add my 2 cents   I had the same goal  to change the background color from the  java class   But none of the above methods worked for me    Issue was  that I set the background color inside the layout  xml file with android background   color colorGray     lt  xml version  1 0  encoding  utf-8   gt   lt LinearLayout xmlns android  http   schemas android com apk res android      android layout width  fill parent      android layout height  fill parent      android background   color colorGray  gt    So I just deleted particular line    lt  xml version  1 0  encoding  utf-8   gt   lt LinearLayout xmlns android  http   schemas android com apk res android      android layout width  fill parent      android layout height  fill parent  gt    Now I  you  can set the color from the code with   getWindow   getDecorView   setBackgroundColor Color GRAY

[java] Android: Changing Background-Color of the Activity (Main View)

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