xamarin - Android 4.4.2 crash during picking image -


during developing application in xamarin android encountered strange error. pick image/video (whether camera or documents ui) application crashes no error. scenario open application, make steps activity, images chosen, , open camera or document ui standard way: 

    public void choosemediaaftertypechose (bool photo, bool camera) {         try {             string title = "";             int id;              intent iintent;              if (camera) {                 if (photo) {                     iintent = new intent("android.media.action.image_capture");                     id = const.and_pickimageid_camera;                     app._file = new file (app._dir, "myphoto.jpg");                     iintent.putextra (android.provider.mediastore.extraoutput, uri.fromfile (app._file));                 } else {                     iintent = new intent("android.media.action.video_capture");                     id = const.and_pickvideoid_camera;                      app._file = new file (app._dir, "myvideo.mp4");                     iintent.putextra (android.provider.mediastore.extraoutput, uri.fromfile (app._file));                 }             } else {                 iintent = new intent ();                 iintent.setaction (intent.actiongetcontent);                 if (photo) {                     iintent.settype ("image/jpg");                     title = static.maindata.currenttexts.choosephoto;                     id = const.and_pickimageid_galery;                 } else {                     iintent.settype ("video/mp4");                     title = static.maindata.currenttexts.choosevideo;                     id = const.and_pickvideoid_galery;                 }             }              if (camera) {                 startactivityforresult (iintent, id);             } else {                 startactivityforresult (intent.createchooser (iintent, title), id);             }         } catch (exception ex) {             showerror (static.maindata.currenttexts.mediaerror);             w.l(ex.message);         }     }

the chosen application crashes during image/video picking (e.g. during browsing images in gallery wthout picking any). when happens never method in our code.

what have:

  1. when user don't pick photos, application runs without memory crash
  2. sometimes picking proceedes without error.
  3. we think issue on android 4.4.2 (it happend on devices android - on other android version devices didn't encounter it)

what tried:

  1. we put permissions manifest (read/write external storage, hardware.camera etc.)
  2. we delete memory stored content save memory
  3. all activities unload memory when leave screen
  4. logcat says every process connected (application , active application) died no trace error

our question if stumbled similar issue , how handle it. second question if there way find out whats happening.

edit:

app._dir code added.

        app._dir = new java.io.file (             environment.getexternalstoragepublicdirectory (                 environment.directorypictures), "camera");         if (!app._dir.exists ())         {             app._dir.mkdirs( );         }


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