Android: Expandable List/Gridview causing never-ending loading -

my app contains 2 expandableheightlistviews , 1 expandableheightgridview shared vertical scrolling.

the contents of views read in file. works fine small files, data displayed correctly , activity loads.

however, when selecting large files, activity never loads, when debug it, adapters 3 views looping round endlessly. i'm assuming due expanded nature of views trying load everything, surely can avoided?

here code ...

expandableheightlistview ...

public class expandableheightlistview extends listview {      boolean expanded = false;      public expandableheightlistview(context context)     {         super(context);     }      public expandableheightlistview(context context, attributeset attrs)     {         super(context, attrs);     }      public expandableheightlistview(context context, attributeset attrs, int defaultstyle)     {         super(context, attrs, defaultstyle);     }      public boolean isexpanded()      {         return expanded;     }      @override     public void onmeasure(int widthmeasurespec, int heightmeasurespec)     {         // hack!  take android!         if (isexpanded())         {             // calculate entire height providing large height hint.             // view.measured_size_mask represents largest height possible.             int expandspec = measurespec.makemeasurespec(measured_size_mask,                     measurespec.at_most);             super.onmeasure(widthmeasurespec, expandspec);              viewgroup.layoutparams params = getlayoutparams();             params.height = getmeasuredheight();         }         else         {             super.onmeasure(widthmeasurespec, heightmeasurespec);         }     }      public void setexpanded(boolean expanded)      {         this.expanded = expanded;     } } 

expandableheightgridview ...

public class expandableheightgridview extends gridview {      boolean expanded = false;      public expandableheightgridview(context context)     {         super(context);     }      public expandableheightgridview(context context, attributeset attrs)     {         super(context, attrs);     }      public expandableheightgridview(context context, attributeset attrs,                                     int defstyle)     {         super(context, attrs, defstyle);     }      public boolean isexpanded()     {         return expanded;     }      @override     public void onmeasure(int widthmeasurespec, int heightmeasurespec)     {         // hack! take android!         if (isexpanded())         {             // calculate entire height providing large height hint.             // view.measured_size_mask represents largest height possible.             int expandspec = measurespec.makemeasurespec(measured_size_mask,                     measurespec.at_most);             super.onmeasure(widthmeasurespec, expandspec);              viewgroup.layoutparams params = getlayoutparams();             params.height = getmeasuredheight();         }         else         {             super.onmeasure(widthmeasurespec, heightmeasurespec);         }     }      public void setexpanded(boolean expanded)     {         this.expanded = expanded;     } } 

mainactivity ...

protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview (r.layout.activity_editor);      intent intent = getintent();     m_file = new file (intent.getstringextra ("file_path"));     m_filelength = (int) m_file.length();      // account non-complete line @ end of file ...     if ((m_filelength % 8) == 0)         m_numlines = (m_filelength / 8) + additional_lines;     else         m_numlines = (m_filelength / 8) + additional_lines + 1;      // set index listview     m_indexlistview = (expandableheightlistview) findviewbyid (r.id.index_listview);     m_indexadapter = new indexadapter (getapplicationcontext(), m_numlines);     m_indexlistview.setadapter  (m_indexadapter);     m_indexlistview.setexpanded(true);      // file reader object hex/ascii adapters ...     filereader filereader = new filereader (getapplicationcontext(), m_file);      // set hex gridview     m_hexgridview = (expandableheightgridview) findviewbyid (r.id.hex_gridview);     m_hexadapter = new hexadapter (getapplicationcontext(), filereader);     m_hexgridview.setadapter(m_hexadapter);     m_hexgridview.setexpanded (true);      // set ascii listview     m_asciilistview = (expandableheightlistview) findviewbyid (r.id.ascii_listview);     m_asciiadapter = new asciiadapter (getapplicationcontext(), m_numlines, filereader);     m_asciilistview.setadapter(m_asciiadapter);     m_asciilistview.setexpanded (true);      m_hexgridview.setonitemclicklistener(new adapterview.onitemclicklistener()     {         @override         public void onitemclick(adapterview<?> parent, view view, int position, long id)         {             view.setselected (true);         }     }); 

the 3 adapters read data given file , display accordingly.

does know how fix , make adapter views load necessary part?

edit: adapter code ...

hexadapter ...

public class hexadapter extends baseadapter {     // constants      // number of additional blank lines append ...     private final int additional_lines = 30;      // variables      // context of editoractivity ...     private context m_context;     // reference file being edited ...     private filereader m_filereader;     // number of elements within file ...     private int m_filelength;     // number of total elements produce ...     private int m_numelements;      // functions      public hexadapter (context c, filereader filereader)     {         m_context    = c;         m_filereader = filereader;         m_filelength = (int) m_filereader.getlength();          int finishline = 8 - (m_filelength % 8);         m_numelements = m_filelength + finishline + (additional_lines * 8);     }      public int getcount()     {         return m_numelements;     }      public object getitem(int position)     {         return null;     }      public long getitemid(int position)     {         return 0;     }      // create new textview each item referenced adapter ...     public view getview(int position, view convertview, viewgroup parent)     {         layoutinflater inflater = (layoutinflater)                 m_context.getsystemservice (context.layout_inflater_service);          view view;         if (null == convertview)             view = inflater.inflate (r.layout.editor_hex_element, parent, false);         else             view = convertview;          // remove padding if rightmost element ...         linearlayout container = (linearlayout) view.findviewbyid (r.id.gridview_hex_container);         if ((position % 8) == 7)             container.setpadding (0,0,0,0);         else             container.setpadding (0,0,1,0);          string hextext;          // if position within current file space, read file ...         if (position < m_filelength)         {             // read file , generate hexadecimal text             byte[] buffer = m_filereader.readbytesfromfile(position, 1);             hextext       = integer.tohexstring ((char)buffer[0]).touppercase();              // prepend 0 if length 1 ...             if (hextext.length() == 1)                 hextext = "0" + hextext;         }         else         {             // set default un-edited value (00) ...             hextext = "00";         }          // textview instance , set text ...         textview textview = (textview) view.findviewbyid (r.id.gridview_hex_edit);         textview.settext (hextext);          // set colour depending on file length ...         if (position < m_filelength)             textview.settextcolor (m_context.getresources ().getcolor (r.color.darkeraccentorange));         else             textview.settextcolor (m_context.getresources ().getcolor (r.color.hex_gray));          return view;     }      // todo: add function update file length , numelements variables     // public void updatefilelength (int numlength) ...   } 

asciiadapter ...

    public asciiadapter (context c, int numlines, filereader filereader)     {         m_context    = c;         m_filereader = filereader;         m_numlines   = numlines;         m_filelength = (int) filereader.getlength();     }      public int getcount()     {         return m_numlines;     }      public object getitem(int position)     {         return null;     }      public long getitemid(int position)     {         return 0;     }      // create new textview each item referenced adapter     public view getview(int position, view convertview, viewgroup parent)     {         layoutinflater inflater = (layoutinflater)                 m_context.getsystemservice (context.layout_inflater_service);          view view;         if (null == convertview)             view = inflater.inflate (r.layout.editor_ascii_element, parent, false);         else             view = convertview;          final int readposition  = position * byte_size;         final int fileremaining = m_filelength - readposition;         final int readlength    = (fileremaining >= byte_size) ? byte_size : fileremaining;          byte[] buffer;         stringbuilder builder = new stringbuilder ();          // if of file remaining, read ...         if (readlength > 0)         {             buffer = m_filereader.readbytesfromfile (readposition, readlength);             // build read string ...             (byte b : buffer)                 builder.append (convertbyte (b));         }          // append remaining part of string (not read file) ...         final int remaining = (readlength > 0) ? (byte_size - readlength) : byte_size;         (int k = 0; k < remaining; k++)             builder.append ('.');          textview textview = (textview) view.findviewbyid (r.id.ascii_textview);         textview.settext (builder.tostring());          return view;     } }