How to set background color of a View

Question

I m trying to set the background color of a View  in this case a Button    I use this code      set the background to green v setBackgroundColor 0x0000FF00    v invalidate      It causes the Button to disappear from the screen    What am I doing wrong  and what is the correct way to change the background color on any View   Thanks

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For setting the first color to be seen on screen  you can also do it in the relevant layout xml  better design  by adding this property to the relevant View   android background   FF00FF00

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This works for me v getBackground   setTint Color parseColor  quot  212121 quot      That way only changes the color of the background without change the background itself  This is usefull for example if you have a background with rounded corners

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This should work fine  v setBackgroundColor 0xFF00FF00

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try to add   setBackgroundColor Color parseColor   FF0000

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set the background to green v setBackgroundColor 0x0000FF00    v invalidate      The code does not set the button to green  Instead  it makes the button totally invisible   Explanation  the hex value of the color is wrong  With an Alpha value of zero  the color will be invisible   The correct hex value is 0xFF00FF00 for full opacity green  Any Alpha value between 00 and FF would cause transparency

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When you call setBackgoundColor it overwrites removes any existing background resource  including any borders  corners  padding  etc  What you want to do is change the color of the existing background resource     View v  v getBackground   setColorFilter Color parseColor   00ff00    PorterDuff Mode DARKEN     Experiment with PorterDuff Mode   for different effects

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You can simple use    view setBackgroundColor Color rgb 0  198  255

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In kotlin you could do it like this   val backgroundColor   R color whatever color you like view setBackgroundColor getColorCompat backgroundColor     Where getColorCompat   is an extension function          Extension method to provide simpler access to   link ContextCompat getColor int          fun Context getColorCompat color  Int    ContextCompat getColor this  color

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I tried all the above ways  But I havent achieve what i need  Here is my try  If you are using hexcode for color and want to set the color as background of image  then this is the kotlin code   val bitmap   Bitmap createBitmap 30  30  Bitmap Config ARGB 8888  val canvas   Canvas bitmap  val colorCode     ffffff  canvas drawColor Color parseColor colorCode   mImageViewLogo setImageBitmap bitmap

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You can simple use    view setBackgroundColor Color parseColor   FFFFFF

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This question talks about changing the background color of a view  In one of the answers  the person explains how to change the background color during runtime  Obviously you are going to look into how to modify other objects on the screen  but this should give you a good start by at least allowing you to modify the background color of the view on button click

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Stating with Android 6 use ContextCompact           view setBackgroundColor  ContextCompat getColor this  R color your color

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You can set the hex-color to any resource with   View setBackgroundColor Color parseColor   e7eecc

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Let suppose we have a primary color in values  gt colors xml as    lt resources gt       lt color name  primary  gt  FDD835 lt  color gt   lt  resources gt    so if we want to use our custom color into setBackgroundColor  ColorInt int Color  then we just need an annotation  SuppressLint  ResourceAsColor   with constructor method which will be used as        SuppressLint  ResourceAsColor       public  LinearLayout Context context            super context               Formatting our layout             super setBackgroundColor R color primary

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You made your button transparent  The first byte is the alpha   Try v setBackgroundColor 0xFF00FF00

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You must pass an int in the argument   First Example   view setBackgroundColor -500136    Second Example   int colorId   R color green   view setBackgroundResource colorId

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and what is the correct way to change   the background color on any View    On any View  What you have is correct  though you should drop the invalidate   call   However  some Views already have backgrounds  A Button  for example  already has a background  the face of the button itself  This background is a StateListDrawable  which you can find in android-2 1 data res drawable btn default xml in your Android SDK installation  That  in turn  refers to a bunch of nine-patch bitmap images  available in multiple densities  You would need to clone and modify all of that to accomplish your green goals   In short  you will be better served finding another UI pattern rather than attempting to change the background of a Button

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view setBackgroundColor R color primaryColor     Adds color to previous color value  so i have a different color   What works for me is    view setBackgroundResource R color primaryColor

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mButton setBackgroundColor getResources   getColor R color myColor

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Several choices to do this     Set background to green    v setBackgroundColor 0x00FF00     Set background to green with Alpha   v setBackgroundColor 0xFF00FF00     Set background to green with Color GREEN constant    v setBackgroundColor Color GREEN     Set background to green defining in Colors xml   lt  xml version  1 0  encoding  utf-8   gt   lt resources gt            lt color name  myGreen  gt  00FF00 lt  color gt        lt color name  myGreenWithAlpha  gt  FF00FF00 lt  color gt    lt  resources gt    and using   v setBackgroundResource R color myGreen     and   v setBackgroundResource R color myGreenWithAlpha     or the longer winded   v setBackgroundColor ContextCompat getColor getContext    R color myGreen      and   v setBackgroundColor ContextCompat getColor getContext    R color myGreenWithAlpha

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I use at API min 16   target 23  Button WeekDoneButton    Button  viewWeeklyTimetable findViewById R id week done button    WeekDoneButton setBackgroundColor ContextCompat getColor getActivity    R color colorAccent

[android] How to set background color of a View

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