Setting background colour of Android layout element

Question

I am trying to  somewhat clone the design of an activity from a set of slides on Android UI design  However I am having a problem with a very simple task   I have created the layout as shown in the image  and the header is a TextView in a RelativeLayout  Now I wish to change the background colour of the RelativeLayout  however I cannot seem to figure out how   I know I can set the android background property in the RelativeLayout tag in the XML file  but what do I set it to  I want to define a new colour that I can use in multiple places  Is it a drawable or a string   Additionally I would expect there to be a very simple way to this from within the Eclipse Android UI designer that I must be missing   I am a bit frustrated currently  as this should be an activity that is performed with a few clicks at maximum  So any help is very appreciated

User · Answer

The  res values colors xml    lt color name  red  gt  ffff0000 lt  color gt  android background   color red    example didn t work for me  but the  android background    hexidecimal here without these parenthesis     worked for me in the relative layout element as an attribute

User · Answer

Kotlin  linearLayout setBackgroundColor Color rgb 0xf4 0x43 0x36     or   lt color name  newColor  gt  f44336 lt  color gt    -  linearLayout setBackgroundColor ContextCompat getColor vista context  R color newColor

User · Answer

You can use simple color resources  specified usually inside res values colors xml    lt color name  red  gt  ffff0000 lt  color gt    and use this via android background   color red   This color can be used anywhere else too  e g  as a text color  Reference it in XML the same way  or get it in code via getResources   getColor R color red    You can also use any drawable resource as a background  use android background   drawable mydrawable  for this  that means 9patch drawables  normal bitmaps  shape drawables

User · Answer

The above answers are nice You can also go like this programmatically if you want  First  your layout should have an ID  Add it by writing following  id line in res layout   xml   lt RelativeLayout         android id    id your layout id       lt  RelativeLayout gt    Then  in your Java code  make following changes   RelativeLayout rl    RelativeLayout findViewById R id your layout id   rl setBackgroundColor Color RED     apart from this  if you have the color defined in colors xml  then also you can do programmatically    rl setBackgroundColor ContextCompat getColor getContext    R color red

User · Answer

If you want to change a color quickly  and you don t have Hex numbers memorized  android has a few preset colors you can access like this   android background   android color black    There are 15 colors you can choose from which is nice for testing things out quickly  and you don t need to set up additional files   Setting up a values colors xml file and using straight Hex like explained above will still work

User · Answer

4 possible ways  use one you need   1  Kotlin  val ll   findViewById lt LinearLayout gt  R id your layout id  ll setBackgroundColor ContextCompat getColor this  R color white     2  Data Binding   lt LinearLayout     android background     color white     OR more useful statement-   lt LinearLayout     android background    model colorResId     3  XML   lt LinearLayout     android background   FFFFFF    lt LinearLayout     android background   color white    4  Java  LinearLayout ll    LinearLayout  findViewById R id your layout id   ll setBackgroundColor ContextCompat getColor this  R color white

User · Answer

The answers above all are static  I thought I would provide a dynamic answer  The two files that will need to be in sync are the relative foo xml with the layout and activity bar java which corresponds to the Java class corresponding to this R layout foo   In foo xml set an id for the entire layout    lt  xml version  1 0  encoding  utf-8   gt   lt RelativeLayout android id    id foo       gt    And in activity bar java set the color in the onCreate     public class activity bar extends AppCompatActivty         Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout foo                  Set an id to the layout         RelativeLayout currentLayout                         RelativeLayout  findViewById R id foo            currentLayout setBackgroundColor Color RED                                 I hope this helps

User · Answer

You can use android background   DC143C   or any other RGB values for your color  I have no problem using it this way  as stated here

User · Answer

Android studio 2 1 2  or possibly earlier  will let you pick from a color wheel     I got this by adding the following to my layout   android background   FFFFFF    Then I clicked on the FFFFFF color and clicked on the lightbulb that appeared

[android] Setting background colour of Android layout element

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