java - Choose Image in Gallery -

i have code, when click @ button gallery open , when choose image gallery close again. , nothing happen.

public class mainactivity extends appcompatactivity {

private button loadimagebutton; private imageview imageview;  private static int result_load_image = 1;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      loadimagebutton = (button) findviewbyid(r.id.button);      loadimagebutton.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view view) {             intent = new intent(intent.action_pick, android.provider.mediastore.images.media.external_content_uri);             startactivityforresult(i, result_load_image);         }     }); }  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)findviewbyid(r.id.imageview);         imageview.setimagebitmap(bitmapfactory.decodefile(picturepath));     }     else{         toast.maketext(getapplicationcontext(), "error", toast.length_long).show();     } } 

what wrong?

i hope :

private string getrealpathfromuri(uri contenturi) {     string result = "";     cursor cursor = getcontentresolver().query(contenturi, null, null, null, null);     if (cursor == null) {         result = contenturi.getpath();     } else {         cursor.movetofirst();         int idx = cursor.getcolumnindex(mediastore.images.imagecolumns.data);         result = cursor.getstring(idx);         cursor.close();     }     return result; } 

and in onactivityresult();

imageview = (imageview)findviewbyid(r.id.imageview); imageview.setimagebitmap(bitmapfactory.decodefile(getrealpathfromuri(uri)));