android - unable to resume activity after random selection between pick from gallery and pick from camera -

i unable find root cause of problem unable resume activity. doing wrong app goes crash once random selection between pick gallery , pick camera :(

edit: full logcat:

04-05 12:30:07.479: w/iinputconnectionwrapper(17228): showstatusicon on inactive inputconnection 04-05 12:30:17.109: i/rotateimage(17228): exif orientation: 6 04-05 12:30:17.109: i/rotateimage(17228): rotate value: 90 04-05 12:30:20.139: e/swiss insignia(17228): width=1920 04-05 12:30:20.139: e/swiss insignia(17228): height=2560 04-05 12:30:21.609: i/system.out(17228): str1=l@** 04-05 12:30:31.229: i/rotateimage(17228): exif orientation: 6 04-05 12:30:31.229: i/rotateimage(17228): rotate value: 90 04-05 12:30:33.949: e/swiss insignia(17228): width=1920 04-05 12:30:33.949: e/swiss insignia(17228): height=2560 04-05 12:30:35.089: i/system.out(17228): str2=l@** 04-05 12:30:37.909: w/iinputconnectionwrapper(17228): showstatusicon on inactive inputconnection 04-05 12:30:45.829: i/swiss insignia(17456): trying load opencv library 04-05 12:30:45.889: d/skia_font(17456): load_system_fonts(), name = roboto, style = 0, uniqueid = 1 04-05 12:30:45.889: d/skia_font(17456): load_system_fonts(), name = roboto, style = 1, uniqueid = 2 04-05 12:30:45.889: d/skia_font(17456): load_system_fonts(), name = droid serif, style = 0, uniqueid = 3 04-05 12:30:45.889: d/skia_font(17456): load_system_fonts(), name = droid serif, style = 1, uniqueid = 4 04-05 12:30:45.889: d/skia_font(17456): load_system_fonts(), name = droid serif, style = 2, uniqueid = 5 04-05 12:30:45.899: d/skia_font(17456): load_system_fonts(), name = droid serif, style = 3, uniqueid = 6 04-05 12:30:45.899: d/skia_font(17456): load_system_fonts(), name = droid sans mono, style = 0, uniqueid = 7 04-05 12:30:45.909: d/skia_font(17456): load_system_fonts(), name = droid sans arabic, style = 0, uniqueid = 8 04-05 12:30:45.909: d/skia_font(17456): load_system_fonts(), name = droid sans hebrew, style = 0, uniqueid = 9 04-05 12:30:45.909: d/skia_font(17456): load_system_fonts(), name = samsungarmenian, style = 0, uniqueid = 10 04-05 12:30:45.909: d/skia_font(17456): load_system_fonts(), name = samsunggeorgian, style = 0, uniqueid = 11 04-05 12:30:45.909: d/skia_font(17456): load_system_fonts(), name = droid sans thai, style = 0, uniqueid = 12 04-05 12:30:45.909: d/skia_font(17456): load_system_fonts(), name = helvem_telugu, style = 0, uniqueid = 13 04-05 12:30:45.909: d/skia_font(17456): load_system_fonts(), name = droid sans fallback, style = 0, uniqueid = 14 04-05 12:30:45.919: d/skia_font(17456): load_system_fonts(), oldsansuid = 0, newsansuid = 1 04-05 12:30:45.919: d/skia_font(17456): load_system_fonts(), oldsansbolduid = 0, newsansbolduid = 2 04-05 12:30:45.969: w/dalvikvm(17456): threadid=1: thread exiting uncaught exception (group=0x40018578) 04-05 12:30:45.989: e/androidruntime(17456): fatal exception: main 04-05 12:30:45.989: e/androidruntime(17456): java.lang.runtimeexception: unable resume activity {.mainactivity}: java.lang.runtimeexception: failure delivering result resultinfo{who=null, request=1, result=-1, data=null} activity {.mainactivity}: java.lang.nullpointerexception 04-05 12:30:45.989: e/androidruntime(17456):    @ android.app.activitythread.performresumeactivity(activitythread.java:2124) 04-05 12:30:45.989: e/androidruntime(17456):    @ android.app.activitythread.handleresumeactivity(activitythread.java:2139) 04-05 12:30:45.989: e/androidruntime(17456):    @ android.app.activitythread.handlelaunchactivity(activitythread.java:1672)  04-05 12:30:45.989: e/androidruntime(17456):    @ android.app.activitythread.access$1500(activitythread.java:117) 04-05 12:30:45.989: e/androidruntime(17456):    @ android.app.activitythread$h.handlemessage(activitythread.java:935) 04-05 12:30:45.989: e/androidruntime(17456):    @ android.os.handler.dispatchmessage(handler.java:99) 04-05 12:30:45.989: e/androidruntime(17456):    @ android.os.looper.loop(looper.java:130) 04-05 12:30:45.989: e/androidruntime(17456):    @ android.app.activitythread.main(activitythread.java:3687) 04-05 12:30:45.989: e/androidruntime(17456):    @ java.lang.reflect.method.invokenative(native method) 04-05 12:30:45.989: e/androidruntime(17456):    @ java.lang.reflect.method.invoke(method.java:507) 04-05 12:30:45.989: e/androidruntime(17456):    @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:867) 04-05 12:30:45.989: e/androidruntime(17456):    @ com.android.internal.os.zygoteinit.main(zygoteinit.java:625) 04-05 12:30:45.989: e/androidruntime(17456):    @ dalvik.system.nativestart.main(native method) 04-05 12:30:45.989: e/androidruntime(17456): caused by: java.lang.runtimeexception: failure delivering result resultinfo{who=null, request=1, result=-1, data=null} activity {.mainactivity}: java.lang.nullpointerexception 04-05 12:30:45.989: e/androidruntime(17456):    @ android.app.activitythread.deliverresults(activitythread.java:2536) 04-05 12:30:45.989: e/androidruntime(17456):    @ android.app.activitythread.performresumeactivity(activitythread.java:2111) 04-05 12:30:45.989: e/androidruntime(17456):    ... 12 more 04-05 12:30:45.989: e/androidruntime(17456): caused by: java.lang.nullpointerexception 04-05 12:30:45.989: e/androidruntime(17456):    @ .onactivityresult(mainactivity.java:101) 04-05 12:30:45.989: e/androidruntime(17456):    @ android.app.activity.dispatchactivityresult(activity.java:3908) 04-05 12:30:45.989: e/androidruntime(17456):    @ android.app.activitythread.deliverresults(activitythread.java:2532) 04-05 12:30:45.989: e/androidruntime(17456):    ... 13 more 

code:

public class mainactivity extends activity  { private static final int pick_from_camera = 1; private static final int pick_from_gallery = 2; final string tag = "swiss insignia"; imageview imgview; textview output; button buttoncamera; button buttongallery; file destimage; private baseloadercallback mopencvcallback = new baseloadercallback(this)  {@override     public void onmanagerconnected(int status)      {         switch (status)          {             case loadercallbackinterface.success:             {                 log.i(tag, "opencv loaded successfully");                 // create , set view                 system.loadlibrary("swissinsignia");                 log.i(tag, "libswissinsignia.so loaded successfully");             } break;             default:             {                 super.onmanagerconnected(status);             } break;         }     } };@override  public void oncreate(bundle savedinstancestate)  {     super.oncreate(savedinstancestate);     log.i(tag, "trying load opencv library");     if (!opencvloader.initasync(opencvloader.opencv_version_2_4_2, this, mopencvcallback))     {         log.e(tag, "cannot connect opencv manager");     }     setcontentview(r.layout.activity_main);     imgview = (imageview) findviewbyid(r.id.imageview1);     output = (textview)findviewbyid(r.id.textviewoutput);     buttoncamera = (button) findviewbyid(r.id.btn_take_camera);     buttongallery = (button) findviewbyid(r.id.btn_select_gallery);     buttoncamera.setonclicklistener(new view.onclicklistener()      {         public void onclick(view v)          {             intent intent = new intent(android.provider.mediastore.action_image_capture);             file dir = new file(environment.getexternalstoragedirectory().getabsolutepath(), "swissinsignia");             if (!dir.isdirectory())             {                 dir.mkdir();             }                destimage = new file(dir, new date().gettime() + ".jpg");             intent.putextra(mediastore.extra_output,uri.fromfile(destimage));             startactivityforresult(intent, pick_from_camera);         }     });     buttongallery.setonclicklistener(new view.onclicklistener()      {         public void onclick(view v)          {             intent photopickerintent = new intent(intent.action_get_content);             photopickerintent.settype("image/*");             startactivityforresult(photopickerintent, pick_from_gallery);         }     }); }  protected void onactivityresult(int requestcode, int resultcode, intent data)  {     if (requestcode == pick_from_camera)      {             file f = new file(destimage.getabsolutepath());             int rotateimage = getcameraphotoorientation(this, uri.parse(destimage.getabsolutepath()), destimage.getabsolutepath());             bitmap photo= convertbitmaptocorrectorientation( bitmapfactory.decodefile(f.getabsolutepath()), rotateimage);             //bitmap photo = bitmapfactory.decodefile(f.getabsolutepath());             log.e(tag, "width="+photo.getwidth());             log.e(tag, "height="+photo.getheight());             mat mrgba=new mat();             org.opencv.android.utils.bitmaptomat(photo,mrgba);             string str1=findfeatures(mrgba.getnativeobjaddr());             system.out.println("str1="+str1);             imgview.setimagebitmap(photo);             output.settext("detected pattern="+str1);     }     if (requestcode == pick_from_gallery)      {         uri selectedimage = data.getdata();         string[] filepathcolumn = { mediastore.images.media.data };         cursor cursor = getcontentresolver().query(selectedimage,filepathcolumn, null, null, null);         cursor.movetofirst();         int columnindex = cursor.getcolumnindex(filepathcolumn[0]);         string picturepath = cursor.getstring(columnindex);         cursor.close();         int rotateimage = getcameraphotoorientation(this, selectedimage, picturepath);         bitmap photo= convertbitmaptocorrectorientation( bitmapfactory.decodefile(picturepath), rotateimage);         log.e(tag, "width="+photo.getwidth());         log.e(tag, "height="+photo.getheight());         mat mrgba=new mat();         org.opencv.android.utils.bitmaptomat(photo,mrgba);         string str2=findfeatures(mrgba.getnativeobjaddr());         system.out.println("str2="+str2);         bitmap mutablebitmap = photo.copy(bitmap.config.argb_8888, true);         imgview.setimagebitmap(mutablebitmap);         output.settext("detected pattern="+str2);     } }  public static bitmap convertbitmaptocorrectorientation(bitmap photo,int rotation)  {     int width = photo.getwidth();     int height = photo.getheight();     matrix matrix = new matrix();     matrix.prerotate(rotation);     return bitmap.createbitmap(photo, 0, 0, width, height, matrix, false); } public int getcameraphotoorientation(context context, uri imageuri, string imagepath) {     int rotate = 0;     try      {         context.getcontentresolver().notifychange(imageuri, null);         file imagefile = new file(imagepath);         exifinterface exif = new exifinterface(imagefile.getabsolutepath());         int orientation = exif.getattributeint(exifinterface.tag_orientation, exifinterface.orientation_normal);         switch (orientation)          {             case exifinterface.orientation_rotate_270:                 rotate = 270;             break;             case exifinterface.orientation_rotate_180:                 rotate = 180;             break;             case exifinterface.orientation_rotate_90:                 rotate = 90;             break;         }         log.i("rotateimage", "exif orientation: " + orientation);         log.i("rotateimage", "rotate value: " + rotate);     }      catch (exception e)      {         e.printstacktrace();     }     return rotate; }      public static native string findfeatures( long mataddrrgba); } 

the problem simple activity restarting when coming camera because camera uses lot of resource work hence destimage null

so use on onsaveinstancestate save these king of variables , restore them @ oncreate bundle savedinstancestate

or

use

destimage = new file(dir,  "sample.jpg"); 

at oncreate() , not in onclick()

edit

also check if result ok resultcode==result_ok

protected void onactivityresult(int requestcode, int resultcode, intent data)      {          if(resultcode== result_ok )         {         if (requestcode == pick_from_camera)          {                 file f = new file(destimage.getabsolutepath());                 int rotateimage = getcameraphotoorientation(this, uri.parse(destimage.getabsolutepath()), destimage.getabsolutepath());                 bitmap photo= convertbitmaptocorrectorientation( bitmapfactory.decodefile(f.getabsolutepath()), rotateimage);                 //bitmap photo = bitmapfactory.decodefile(f.getabsolutepath());                 log.e(tag, "width="+photo.getwidth());                 log.e(tag, "height="+photo.getheight());                   imgview.setimagebitmap(photo);                 output.settext("detected pattern=");         }         if (requestcode == pick_from_gallery)          {             uri selectedimage = data.getdata();             string[] filepathcolumn = { mediastore.images.media.data };             cursor cursor = getcontentresolver().query(selectedimage,filepathcolumn, null, null, null);             cursor.movetofirst();             int columnindex = cursor.getcolumnindex(filepathcolumn[0]);             string picturepath = cursor.getstring(columnindex);             cursor.close();             int rotateimage = getcameraphotoorientation(this, selectedimage, picturepath);             bitmap photo= convertbitmaptocorrectorientation( bitmapfactory.decodefile(picturepath), rotateimage);             log.e(tag, "width="+photo.getwidth());             log.e(tag, "height="+photo.getheight());              bitmap mutablebitmap = photo.copy(bitmap.config.argb_8888, true);             imgview.setimagebitmap(mutablebitmap);             output.settext("detected pattern=");         }         }     }