How to set background color of an Activity to white programmatically

Question

How can I set the background color of an Activity to white programatically

User · Answer

Add this single line in your activity  after setContentView   call  getWindow   getDecorView   setBackgroundColor Color WHITE

User · Answer

In your onCreate   method   getWindow   getDecorView   setBackgroundColor getResources   getColor R color main activity background color      Also you need to add to values folder a new XML file called color xml and Assign there a new color property   color xml    lt  xml version  1 0  encoding  utf-8   gt   lt resources gt   lt color name  main activity background color  gt  000000 lt  color gt   lt  resources gt    Note that you can name the color xml any name you want but you refer to it by code as R color yourId   EDIT  Because getResources   getColor   is deprecated  use getWindow   getDecorView   setBackgroundColor ContextCompat getColor MainActivity this  R color main activity background color     instead

User · Answer

for activity findViewById android R id content  setBackgroundColor color

User · Answer

Get a handle to the root layout used  then set the background color on that  The root layout is whatever you called setContentView with    setContentView R layout main         Now get a handle to any View contained       within the main layout you are using   View someView   findViewById R id randomViewInMainLayout         Find the root view   View root   someView getRootView          Set the color   root setBackgroundColor getResources   getColor android R color red

User · Answer

final View rootView   findViewById android R id content   rootView setBackgroundResource

User · Answer

Button btn  View root   Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout activity main       btn    Button findViewById R id button        btn setOnClickListener new View OnClickListener              Override         public void onClick View view                root  findViewById R id activity main  getRootView                root setBackgroundColor Color parseColor   FFFFFF

User · Answer

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 myScreen   lt  LinearLayout gt    In other words   android background  is the tag in the XML you want to change   If you need to dynamically update the background value  see the following   Exercise  Change background color  by SeekBar

User · Answer

The best method right now is of course getWindow   getDecorView   setBackgroundColor ContextCompat getColor MainActivity this  R color main activity background color     Please be aware though  if you have anything set as the background color in Designer  it will overwrite anything you try to set in your code

User · Answer

View randview   new View getBaseContext     randview    View findViewById R id container   randview setBackgroundColor Color BLUE     worked for me  thank you

User · Answer

I prefer coloring by theme   lt style name  CustomTheme  parent  android Theme Light  gt       lt item name  android windowBackground  gt  color custom theme color lt  item gt       lt item name  android colorBackground  gt  color custom theme color lt  item gt   lt  style gt

User · Answer

To get the root view defined in your xml file  without action bar  you can use this   View root     ViewGroup  findViewById android R id content   getChildAt 0     So  to change color to white   root setBackgroundResource Color WHITE

User · Answer

You can use this to call predefined android colours   element setBackgroundColor android R color red     If you want to use one of your own custom colours  you can add your custom colour to strings xml and then use the below to call it   element setBackgroundColor R color mycolour     However if you want to set the colour in your layout xml you can modify and add the below to any element that accepts it   android background   FFFFFF

[java] How to set background color of an Activity to white programmatically?

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