android - got null when creating bitmap from byte array -


i create main hashmap repo caching user images comes server. cache static. cache saves user id key , byte array value.

private static hashmap<string, byte[]> sdrawables;  public static hashmap<string, byte[]> getmapinstance (){   if (sdrawables == null)      sdrawables = new hashmap<>();    return sdrawables; }

i use of asynctask downloading images server , put id , images array on hashmap , after this, put map main static hashmap:

for (map.entry<string, byte[]> entry : drawables.entryset()) {   imgfactory.getmapinstance().put(entry.getkey(), entry.getvalue()); }

on place want set user image imageview, send user id main hashmap , after finding value , convert value bitmap. bitmap not created bitmap null:

public static drawable getconfigdrawable(context context, string name) {   if (getmapinstance() != null && getmapinstance().containskey(name)) {      log.i("====>", "getconfigdrawable: "+ getmapinstance().containskey(name));      byte[] arr = getmapinstance().get(name);      bitmap bitmap = bitmapfactory.decodebytearray(arr, 0, arr.length);       log.i("===", "getconfigdrawable: " + bitmap.getheight());      return new bitmapdrawable(context.getresources(), bitmap);   }   return null; }

the message

java.lang.nullpointerexception: attempt invoke virtual method 'int android.graphics.bitmap.getheight()' on null object reference                                                                                @ safarayaneh.com.anotify.util.imgfactory.getconfigdrawable(imgfactory.java:72)                                                                                @ safarayaneh.com.anotify.adapter.notifyadapter$1.oncomplete(notifyadapter.java:201)                                                                                @ safarayaneh.com.anotify.util.imgfactory$1.onresult(imgfactory.java:59)                                                                                @ safarayaneh.com.anotify.tasks.getimagetask.onpostexecute(getimagetask.java:87)                                                                                @ safarayaneh.com.anotify.tasks.getimagetask.onpostexecute(getimagetask.java:21)                                                                                @ android.os.asynctask.finish(asynctask.java:651)                                                                                @ android.os.asynctask.-wrap1(asynctask.java)                                                                                @ android.os.asynctask$internalhandler.handlemessage(asynctask.java:668)                                                                                @ android.os.handler.dispatchmessage(handler.java:102)                                                                                @ android.os.looper.loop(looper.java:148)                                                                                @ android.app.activitythread.main(activitythread.java:5417)                                                                                @ java.lang.reflect.method.invoke(native method)                                                                                @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:726)                                                                                @ com.android.internal.os.zygoteinit.main(zygoteinit.java:616)

my log:

anotify.debug i/====>: getconfigdrawable: true   log.i("=====", "getconfigdrawable: length:"+ arr.length); debug i/=====: getconfigdrawable: length: 12090

edit

finally, these code ok , got bitmap.

     byte[] tmp=new byte[result.getjsonarray("userimage").length()];         for(int i=0;i<result.getjsonarray("userimage").length();i++){             tmp[i]=(byte)(((int)result.getjsonarray("userimage").get(i)) & 0xff);         }

as getting byte asynktask should try decoding byte decodestream(inputstream is) ,decodestream , decode input stream bitmap instead of decodebytearray(); decodebytearray , decode immutable bitmap specified byte array.


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