How set background drawable programmatically in Android

Question

To set Background   RelativeLayout layout   RelativeLayout findViewById R id background   layout setBackgroundResource R drawable ready     Is the best way to do it

User · Answer

try this    int res   getResources   getIdentifier  you image    drawable    com my package     preview    ImageView  findViewById R id preview    preview setBackgroundResource res

User · Answer

layout setBackgroundResource R drawable ready   is correct  Another way to achieve it is to use the following   final int sdk   android os Build VERSION SDK INT  if sdk  lt  android os Build VERSION CODES JELLY BEAN        layout setBackgroundDrawable ContextCompat getDrawable context  R drawable ready       else       layout setBackground ContextCompat getDrawable context  R drawable ready        But I think the problem occur because you are trying to load big images  Here is a good tutorial how to load large bitmaps   UPDATE  getDrawable int   deprecated in API level 22  getDrawable int   is now deprecated in API level 22  You should use the following code from the support library instead   ContextCompat getDrawable context  R drawable ready    If you refer to the source code of ContextCompat getDrawable  it gives you something like this          Return a drawable object associated with a particular resource ID      lt p gt     Starting in   link android os Build VERSION CODES LOLLIPOP   the returned    drawable will be styled for the specified Context s theme         param id The desired resource identifier  as generated by the aapt tool                This integer encodes the package  type  and resource entry                The value 0 is an invalid identifier      return Drawable An object that can be used to draw this resource      public static final Drawable getDrawable Context context  int id        final int version   Build VERSION SDK INT      if  version  gt   21            return ContextCompatApi21 getDrawable context  id         else           return context getResources   getDrawable id             More details on ContextCompat   As of API 22  you should use the getDrawable int  Theme  method instead of getDrawable int    UPDATE  If you are using the support v4 library  the following will be enough for all versions   ContextCompat getDrawable context  R drawable ready    You will need to add the following in your app build gradle  compile  com android support support-v4 23 0 0    or any version above   Or using ResourceCompat  in any API like below     import android support v4 content res ResourcesCompat  ResourcesCompat getDrawable getResources    R drawable name of drawable  null

User · Answer

Give a try to ViewCompat setBackground yourView  drawableBackground

User · Answer

setBackground getContext   getResources   getDrawable R drawable green rounded frame

User · Answer

Try this   layout setBackground ContextCompat getDrawable context  R drawable ready      and for API 16 lt    layout setBackgroundDrawable ContextCompat getDrawable context  R drawable ready

User · Answer

Try this code   Drawable thumb   ContextCompat getDrawable getActivity    R mipmap cir 32   mSeekBar setThumb thumb

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if  android os Build VERSION SDK INT  lt  Build VERSION CODES JELLY BEAN       layout setBackgroundDrawable getResources   getDrawable R drawable ready    else if android os Build VERSION SDK INT  lt  Build VERSION CODES LOLLIPOP MR1       layout setBackground getResources   getDrawable R drawable ready    else      layout setBackground ContextCompat getDrawable this  R drawable ready

User · Answer

I m using a minSdkVersion 16 and targetSdkVersion 23  The following is working for me  it uses     ContextCompat getDrawable context  R drawable drawable     Instead of using       layout setBackgroundResource R drawable ready     Rather use   layout setBackground ContextCompat getDrawable this  R drawable ready      getActivity   is used in a fragment  if calling from a activity use this

User · Answer

RelativeLayout relativeLayout     declare this globally   now  inside any function like onCreate  onResume  relativeLayout   new RelativeLayout this     relativeLayout setBackgroundResource R drawable view     or whatever your image is setContentView relativeLayout     you might be forgetting this

User · Answer

Inside the app res your xml layout file xml   Assign a name to your parent layout  Go to your MainActivity and find your RelativeLayout by calling the findViewById R id  given name    Use the layout as a classic Object  by calling the method setBackgroundColor

User · Answer

If your backgrounds are in the drawable folder right now try moving the images from drawable to drawable-nodpi folder in your project  This worked for me  seems that else the images are rescaled by them self

User · Answer

You can also set the background of any Image   View v  Drawable image  Drawable getResources   getDrawable R drawable img    ImageView v setBackground image

User · Answer

Use butterknife to bind the drawable resource to a variable by adding this to the top of your class  before any methods     Bind R id some layout  RelativeLayout layout   BindDrawable R drawable some drawable  Drawable background    then inside one of your methods add  layout setBackground background     That s all you need

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