android - Palette class is crashing my app on some images -

i making google i/o 2014 music player, , having trouble color extraction album art. here albums screen class:

package com.animbus.music;  import android.graphics.bitmap; import android.graphics.bitmapfactory; import android.graphics.porterduff; import android.graphics.drawable.bitmapdrawable; import android.graphics.drawable.drawable; import android.os.bundle; import android.support.v7.app.appcompatactivity; import android.support.v7.graphics.palette; import android.view.menu; import android.view.menuitem; import android.widget.imagebutton; import android.widget.imageview;  import java.security.spec.pssparameterspec;   public class albums_activity extends appcompatactivity {      public bundle b;     public string albumname;     public string albumartist;     public int albumart;     public int primarycolor;     public int accentcolor;     public int titletextcolor;     public int subtitletextcolor;     public int fabicon;     public palette palette;      protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_albums_activity);         //get intent data , set easier handle , use         b = getintent().getextras();         albumname = b.getstring("album_name");         albumartist = b.getstring("album_artist");         albumart = b.getint("album_art");         drawable albumartdrawable = getdrawable(albumart);         bitmap albumart = bitmapfactory.decoderesource(getresources(), albumart);          imageview albumartview = (imageview) findviewbyid(r.id.albums_activity_albumart);         imagebutton playall = (imagebutton) findviewbyid(r.id.play_all_fab);         //make sure colors aren't null         primarycolor = getresources().getcolor(r.color.accent);         accentcolor = getresources().getcolor(r.color.accent);         titletextcolor = getresources().getcolor(r.color.accent);         subtitletextcolor = getresources().getcolor(r.color.accent);         fabicon = getresources().getcolor(r.color.accent);          //convert palette resources         palette = palette.from(albumart).generate();          primarycolor = palette.getvibrantswatch().getrgb();         accentcolor = palette.getlightvibrantswatch().getrgb();         titletextcolor = palette.getvibrantswatch().gettitletextcolor();         subtitletextcolor = palette.getvibrantswatch().getbodytextcolor();         fabicon = palette.getlightvibrantswatch().gettitletextcolor();          //toolbar, setting toolbar actionbar,setting arrow shown, , setting title nothing         android.support.v7.widget.toolbar toolbar = (android.support.v7.widget.toolbar) findviewbyid(r.id.album_toolbar);         android.support.v7.widget.toolbar infotoolbar = (android.support.v7.widget.toolbar) findviewbyid(r.id.album_info_toolbar);         setsupportactionbar(toolbar);         //noinspection constantconditions         getsupportactionbar().setdisplayhomeasupenabled(true);         toolbar.settitle("");         //sets title intent's data         infotoolbar.settitle(albumname);         infotoolbar.setsubtitle(albumartist);         //sets albumart         albumartview.setimageresource(albumart);         //sets color of info toolbar based on albumart         infotoolbar.setbackgroundcolor(primarycolor);         infotoolbar.settitletextcolor(titletextcolor);         infotoolbar.setsubtitletextcolor(subtitletextcolor);         //sets accent color based on album art         playall.getbackground().setcolorfilter(accentcolor, porterduff.mode.src_atop);         playall.getdrawable().setcolorfilter(fabicon,porterduff.mode.src_atop);     }      @override     public boolean oncreateoptionsmenu(menu menu) {         // inflate menu; adds items action bar if present.         getmenuinflater().inflate(r.menu.menu_albums_activity, menu);         return true;     }      @override     public boolean onoptionsitemselected(menuitem item) {         // handle action bar item clicks here. action bar         // automatically handle clicks on home/up button, long         // specify parent activity in androidmanifest.xml.         int id = item.getitemid();          //noinspection simplifiableifstatement         if (id == r.id.action_settings) {             return true;         }          return super.onoptionsitemselected(item);     } } 

here problem. have app 3 buttons, album, album alt, , album alt 2. album alt opens. others throw:

java.lang.runtimeexception: unable start activity componentinfo{com.animbus.music/com.animbus.music.albums_activity}: java.lang.nullpointerexception: attempt invoke virtual method 'int android.support.v7.graphics.palette$swatch.getrgb()' on null object reference 

and app crashes. says problem at:

primarycolor = palette.getvibrantswatch().getrgb(); 

i think might because of palette.getvibrantswatch().getrgb() equaling null. don't know please help, have disable palette , continue making app please help

its not necessary palette return vibrantswatch. check null before calling getrgb().

palette.swatch vibrantswatch = palette.getvibrantswatch();   if(vibrantswatch != null) {     //get rgb   } else {     //get swatch } 

you can swatches available palette using getswatches(). then, used color, pick swatch having maximum pixel population. can pixel population calling getpopulation() on swatches.