java - handle the result form the gallery -

i searched many days how image gallery admit found alot of codes no 1 worked . have code , when hit button , choose image program stop "unfortunately app has stopped " . appreciated ... code

public class mainactivity extends appcompatactivity {  private static int result_load_image = 1;   @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      button buttonloadimage = (button) findviewbyid(r.id.button);     buttonloadimage.setonclicklistener(new view.onclicklistener() {          @override         public void onclick(view arg0) {              intent = new intent(                     intent.action_pick,                     android.provider.mediastore.images.media.external_content_uri);              startactivityforresult(i, result_load_image);         }     }); }   @override protected void onactivityresult(int requestcode, int resultcode, intent data) {     super.onactivityresult(requestcode, resultcode, data);      if (requestcode == result_load_image && resultcode == result_ok && null != data) {         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();          imageview imageview = (imageview) findviewbyid(r.id.imageview);         imageview.setimagebitmap(bitmapfactory.decodefile(picturepath));     } } 

}

below working solution of choosing picture library or capturing 1 camera , using in imageview.

source : so

firstly initialize imageview in oncreate method. call selectimage function through button's onclick event , that's it.

//functions select image device     private void selectimage() {         final charsequence[] items = {"take photo","choose library", "cancel" };         alertdialog.builder builder = new alertdialog.builder(signature_new.this);         builder.settitle("add photo!");         builder.setitems(items, new dialoginterface.onclicklistener() {             @override             public void onclick(dialoginterface dialog, int item) {                 if (items[item].equals("take photo")) {                     intent intent = new intent(mediastore.action_image_capture);                     startactivityforresult(intent, request_camera);                 } else if (items[item].equals("choose library")) {                     intent intent = new intent(                             intent.action_pick,                             android.provider.mediastore.images.media.external_content_uri);                     intent.settype("image/*");                     startactivityforresult(                             intent.createchooser(intent, "select file"),                             select_file);                 } else if (items[item].equals("cancel")) {                     dialog.dismiss();                 }             }         });         builder.show();     }      @override     protected void onactivityresult(int requestcode, int resultcode, intent data) {         super.onactivityresult(requestcode, resultcode, data);         if (resultcode == result_ok) {             if (requestcode == request_camera) {                 bitmap thumbnail = (bitmap) data.getextras().get("data");                 bytearrayoutputstream bytes = new bytearrayoutputstream();                 thumbnail.compress(bitmap.compressformat.jpeg, 90, bytes);                  file destination = new file(environment.getexternalstoragedirectory(),                         system.currenttimemillis() + ".jpg");                  fileoutputstream fo;                 try {                     destination.createnewfile();                     fo = new fileoutputstream(destination);                     fo.write(bytes.tobytearray());                     fo.close();                 } catch (filenotfoundexception e) {                     e.printstacktrace();                 } catch (ioexception e) {                     e.printstacktrace();                 }                   imagef.setimage(imagesource.bitmap(thumbnail));              } else if (requestcode == select_file) {                 uri selectedimageuri = data.getdata();                 try {                      bitmap bm=decodeuri(selectedimageuri);                     imageviewf.setimage(imagesource.bitmap(bm));                     //uploadbm=bm;                     //dialog_dimension();                 }                 catch(filenotfoundexception e) {                     e.printstacktrace();                 }              }         }     }