android - Null pointer on a imageview, don't know how to pass it to a view -

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• what nullpointerexception, , how fix it? 12 answers

i have app takes picture , want see picture when taken. , works fine, picture , save storage. made view called "activity_image.xml. nullpointer:

java.lang.nullpointerexception: attempt invoke virtual method 'void android.widget.imageview.setimagebitmap(android.graphics.bitmap)' on null object reference 

here try pass imageview main activity, , cant figure out how properly:

static final int request_take_photo = 1; static final int request_image_capture = 1; intent takepictureintent = new intent(mediastore.action_image_capture); private bitmap mimagebitmap; private string mcurrentphotopath; private imageview mimageview; @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);      setcontentview(r.layout.activity_fullscreen);      mvisible = true;     mcontrolsview = findviewbyid(r.id.fullscreen_content_controls);     mcontentview = findviewbyid(r.id.fullscreen_content);     sbutton = findviewbyid(r.id.sbutton);     //final intent cam = new intent("android.media.action.image_capture");      // set user interaction manually show or hide system ui.     mcontentview.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view view) {             toggle();         }     });      sbutton.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view view){             dispatchtakepictureintent();         }     });      // upon interacting ui controls, delay scheduled hide()     // operations prevent jarring behavior of controls going away     // while interacting ui.     findviewbyid(r.id.sbutton).setontouchlistener(mdelayhidetouchlistener); }      private void dispatchtakepictureintent() {     intent takepictureintent = new intent(mediastore.action_image_capture);     // ensure there's camera activity handle intent     if (takepictureintent.resolveactivity(getpackagemanager()) != null) {         // create file photo should go         file photofile = null;         try {             photofile = createimagefile();         } catch (ioexception ex) {             // error occurred while creating file             system.out.println("err cannot create file");         }         // continue if file created         if (photofile != null) {             uri photouri = fileprovider.geturiforfile(this,                     "com.example.android.fileprovider",                     photofile);             takepictureintent.putextra(mediastore.extra_output, photouri);             startactivityforresult(takepictureintent, request_take_photo);         }     } } private file createimagefile() throws ioexception {     // create image file name     string timestamp = new simpledateformat("yyyymmdd_hhmmss").format(new date());     string imagefilename = "jpeg_" + timestamp + "_";     file storagedir = getexternalfilesdir(environment.directory_pictures);      file image = file.createtempfile(             imagefilename,  /* prefix */             ".jpg",         /* suffix */             storagedir      /* directory */     );      // save file: path use action_view intents     mcurrentphotopath = "file:" + image.getabsolutepath();     return image; } @override protected void onactivityresult(int requestcode, int resultcode, intent data) {     if (requestcode == request_image_capture && resultcode == result_ok) {         try {             mimagebitmap = mediastore.images.media.getbitmap(this.getcontentresolver(), uri.parse(mcurrentphotopath));              mimageview = (imageview)findviewbyid(r.id.imageview2);             mimageview.setimagebitmap(mimagebitmap);           } catch (ioexception e) {             e.printstacktrace();         }     } } 

activity_image.xml:

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     android:orientation="vertical" android:layout_width="match_parent"     android:layout_height="match_parent"     android:weightsum="1">      <imageview         android:layout_width="match_parent"         android:layout_height="wrap_content"         app:srccompat="@mipmap/ic_launcher"         android:id="@+id/imageview2"         android:layout_weight="0.95" /> </linearlayout> 

mimageview = (imageview)findviewbyid(r.id.imageview2); mimagebitmap = mediastore.images.media.getbitmap(this.getcontentresolver(), uri.parse(mcurrentphotopath));                 mimageview.setimagebitmap(mimagebitmap); 

just reformate code this
change :

setcontentview(r.layout.activity_image);