android - OnClickItem() in gridView how do I show the same image in a separate imageView -

the gridview being populated contents of specific folder called "mydir". layout gallery_fragment split in half 2 linearlayouts. 1 on left has gridview populated images "mydir". layout on right has imageview.

the idea can select image gridview on left , appear on imageview on right. cannot use res/drawables folder in instance.

i have been told need use hashmap hmap; have suggestions?

   public class galleryfragment4 extends fragment {      private imageview imageview;     private imagegridviewadapter imageadapter;     private gridview gridview;     private static final string gridview_tag = "android logo";        @suppresslint("usesparsearrays")     public hashmap<integer, string> hmap = new hashmap<integer, string>();      // private linearlayout linear;      @override     public view oncreateview(layoutinflater inflater, viewgroup container,             bundle savedinstancestate) {          view rootview = inflater.inflate(r.layout.fragment_gallery, container,                 false);         // assigns gridview object         gridview = (gridview) rootview.findviewbyid(r.id.gridview);          gridarchitecture(rootview);          extractfiles();          /**          * gridview waiting image selected          */         gridview.setonitemclicklistener(new onitemclicklistener() {             @override             public void onitemclick(adapterview<?> parent, view view,                     int position, long id) {                  // image number                 int num = (position + 1);                  // when image selected show image number                 toast.maketext(getactivity().getapplicationcontext(),                         "image : " + num, toast.length_short).show();              ((context) getcameraimages(getactivity())).getapplicationcontext();              try{                 imageview.setimageresource(position);             }catch(nullpointerexception ex){              }              }         });         return rootview;     }      /*      * save image external sd card , create new file if said file not      * created      */      public static final string directory_path = environment             .getexternalstoragedirectory().tostring() + "/mydir/";  //  public static final string camer_image_bucket_id = getbucketid(directory_path);      /**      * matches code in mediaprovider.computebucketvalues. should common      * function.      */ //  public static string getbucketid(string path) { //      return string.valueof(path.tolowercase().hashcode()); //  }      /**      * retrieve camera images      *       * @param context      * @return      */     public static list<string> getcameraimages(context context) {         final string[] projection = { mediastore.images.media.data };         final string selection = mediastore.images.media.bucket_id + " = ?";         final string[] selectionargs = { directory_path };         final cursor cursor = context.getcontentresolver().query(                 images.media.external_content_uri, projection, selection,                 selectionargs, null);          arraylist<string> result = new arraylist<string>(cursor.getcount());         if (cursor.movetofirst()) {             final int datacolumn = cursor                     .getcolumnindexorthrow(mediastore.images.media.data);             {                 final string data = cursor.getstring(datacolumn);                 result.add(data);             } while (cursor.movetonext());         }         cursor.close();         return result;     }      private void extractfiles() {          // name of folder         final string targetpath = directory_path;          // toast showing name of directory images saved to.         toast.maketext(getactivity().getapplicationcontext(), targetpath,                 toast.length_long).show();         file targetdirector = new file(targetpath);          final file[] files = targetdirector.listfiles();         (file file : files) {             imageadapter.add(file.getabsolutepath());         }     }      private void gridarchitecture(view rootview) {         // sets tag         gridview.settag(gridview_tag);          /*          * adapt image gridview format          */         imageadapter = new imagegridviewadapter(getactivity()                 .getapplicationcontext());         gridview.setadapter(imageadapter);          // set orientation landscape         getactivity().setrequestedorientation(                 activityinfo.screen_orientation_landscape);     } } 

if of use here imagegridviewadapter.java

public class imagegridviewadapter extends baseadapter {      private context context;     arraylist<string> imagelist = new arraylist<string>();      public imagegridviewadapter(context c) {         context = c;      }      void add(string path){         imagelist.add(path);      }      @override     public int getcount() {         return imagelist.size();     }      @override     public object getitem(int arg0) {         // todo auto-generated method stub         return null;     }      @override     public long getitemid(int position) {         // todo auto-generated method stub         return 0;     }      @override     public view getview(int position, view convertview, viewgroup parent) {         imageview imageview;         if (convertview == null) {               imageview = new imageview(context);             imageview.setlayoutparams(new gridview.layoutparams(220, 220));             imageview.setscaletype(imageview.scaletype.center_crop);              //8,8,8,8             imageview.setpadding(20, 20, 20, 20);         } else {             imageview = (imageview) convertview;         }          // 200, 200         bitmap bm = decodesampledbitmapfromuri(imagelist.get(position), 100, 100);         imageview.setimagebitmap(bm);          return imageview;     }      public bitmap decodesampledbitmapfromuri(string path, int reqwidth, int reqheight) {          bitmap bm = null;         final bitmapfactory.options options = new bitmapfactory.options();         options.injustdecodebounds = true;         bitmapfactory.decodefile(path, options);         options.insamplesize = calculateinsamplesize(options, reqwidth, reqheight);          options.injustdecodebounds = false;         bm = bitmapfactory.decodefile(path, options);           return bm;        }      public int calculateinsamplesize(          bitmapfactory.options options, int reqwidth, int reqheight) {         final int height = options.outheight;         final int width = options.outwidth;         int insamplesize = 1;          if (height > reqheight || width > reqwidth) {             if (width > height) {                 insamplesize = math.round((float)height / (float)reqheight);                 } else {                 insamplesize = math.round((float)width / (float)reqwidth);                 }            }          return insamplesize;         } } 

here xml fragment_gallery.xml

<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/top"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:background="@color/darkblue"     android:orientation="horizontal" >      <linearlayout         android:id="@+id/center_point"         android:layout_width="0dp"         android:layout_height="0dp"         android:layout_centerinparent="true"         android:orientation="horizontal" />      <linearlayout         android:id="@+id/right_linear"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:layout_torightof="@+id/center_point"         android:background="@drawable/normal_shape" >          <imageview             android:id="@+id/imageview"             android:layout_width="fill_parent"             android:layout_height="fill_parent"             android:layout_marginbottom="320dp"             android:contentdescription="@drawable/android_icon"             android:src="@drawable/android_icon" />     </linearlayout>      <linearlayout         android:id="@+id/left_linear"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:layout_alignparentleft="true"         android:layout_alignright="@+id/center_point" >          <gridview             android:id="@+id/gridview"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:columnwidth="50dp"             android:gravity="center"             android:horizontalspacing="10dip"             android:numcolumns="2"             android:stretchmode="columnwidth"             android:verticalspacing="10dip" >         </gridview>     </linearlayout>  </relativelayout> 

assuming target imageview declared as:

private imageview targetimageview; 

all need register listener below gridview:

gridview.setonitemclicklistener(new onitemclicklistener() {      @override     public void onitemclick(adapterview<?> parent, view view, int position,              long id) {         // know convertview returned adapter's          // getview method imageview can cast here accordingly.         targetimageview.setimagedrawable(((imageview) view).getdrawable());     } });