android - Create dyanamic List Row layout Programatically -
thanks reading query.
we looking template based solution list row each list row might have different-2 field , alignment driven server in form of json.
this json have information no of fields , type of fields label, image , alignment
we came solution each row, in getview() method, parsing layout json , creating field programatically , adding corresponding values , adding relative layout , adding these relative layout parent linear layout vertical orientation. assigning layout convertview , way, row created.
with solution list view not smooth, because lots of calculation happening generate dynamic fields.
any appriciated. below code sample layout json
{ "layouts": [ { "templateid": "hci", "width": "100%", "backgroundcolor": "#87cefa", "selectedbackgroundcolor": "#96f2cd", "cornerradius": "0", "borderwidth": "1", "bordercolor": "#000000", "children": [ { "width": "100%", "height": "20", "rightalign": "0", "children": [ { "type": "label", "field": "claimantname", "textcolor": "#eb6208", "alignment": "left", "fontsize": "16", "style": "upper", "horizontalpadding": "5", "bold": "1" }, { "type": "label", "field": "worktype", "textcolor": "#eb6208", "alignment": "left", "fontsize": "16", "style": "upper", "horizontalpadding": "5", "bold": "0" }, { "type": "label", "field": "workkardnumber", "backgroundcolor": "#2d5db9", "textcolor": "#ffffff", "alignment": "right", "horizontalpadding": "3" } ] }, { "width": "100%", "height": "15", "children": [ { "type": "label", "field": "address", "textcolor": "#458b00", "alignment": "left", "fontsize": "16", "style": "upper", "horizontalpadding": "5", "bold": "1" }, { "type": "label", "field": "lossdate", "textcolor": "#838b83", "alignment": "", "fontsize": "16", "style": "lower", "horizontalpadding": "5", "bold": "0" } ] }, { "width": "100%", "height": "15", "children": [ { "type": "label", "field": "county", "textcolor": "#838b83", "alignment": "left", "fontsize": "16", "style": "upper", "horizontalpadding": "5", "bold": "0" }, { "type": "label", "field": "zip", "textcolor": "#0000ff", "alignment": "", "fontsize": "16", "style": "lower", "horizontalpadding": "5", "bold": "0" }, { "type": "label", "field": "state", "textcolor": "#458b00", "alignment": "", "fontsize": "16", "style": "upper", "horizontalpadding": "5", "bold": "0" }, { "type": "label", "field": "reporteddate", "textcolor": "#838b83", "alignment": "", "fontsize": "16", "style": "lower", "horizontalpadding": "5", "bold": "0" } ] }, { "width": "100%", "height": "50", "children": [ { "type": "spacer", "width": "20" }, { "type": "label", "field": "losstype", "style": "upper", "width": "280", "textcolor": "#458b00", "bold": "1", "fontsize": "16" } ] }, { "width": "100%", "height": "20", "children": [ ] } ] } ] }
and below logic parse , dynamic field creation
public linearlayout generatelayout(object object, workkarddata workkard){ this.workkarddata=workkard; jsonobject json = (jsonobject)object; string template=""; string cardbackground=""; string cardselectedbackground=""; arraylist child=new arraylist(); arraylist subchild=new arraylist(); string fieldname=""; try { template = json.getstring("templateid"); } catch (exception e) { // todo auto-generated catch block e.printstacktrace(); } try { cardbackground = json.getstring("backgroundcolor"); } catch (exception e) { // todo auto-generated catch block e.printstacktrace(); } try { cardselectedbackground = json.getstring("selectedbackgroundcolor"); } catch (exception e) { // todo auto-generated catch block e.printstacktrace(); } try { cardbackground = json.getstring("backgroundcolor"); } catch (exception e) { // todo auto-generated catch block e.printstacktrace(); } linearlayout workkardrowlayout = new linearlayout(context); workkardrowlayout.setorientation(linearlayout.vertical); workkardrowlayout.setbackgroundcolor(color.parsecolor(cardbackground)); try { jsonarray childrentop = json.getjsonarray("children"); child.add(childrentop); (int = 0; < childrentop.length(); i++) { jsonarray subchildren = childrentop.getjsonobject(i).getjsonarray("children"); subchild.add(subchildren); string width="350", height="0", rightalignmen="0"; int widthint=0; try { width = childrentop.getjsonobject(i).getstring("width"); } catch (exception e) { // todo auto-generated catch block e.printstacktrace(); } try { height = childrentop.getjsonobject(i).getstring("height"); } catch (exception e) { // todo auto-generated catch block e.printstacktrace(); } try { rightalignmen = childrentop.getjsonobject(i).getstring("rightalign"); } catch (exception e) { // todo auto-generated catch block e.printstacktrace(); } if(width.equalsignorecase("100%")){ widthint = 350; }else{ widthint = 350*(integer.parseint(width.trim().split("%")[0]))/100; } linearlayout.layoutparams paramsll1 = new linearlayout.layoutparams(widthint,integer.parseint(height.trim())); /*if(rightalignmen.equalsignorecase("1")){ paramsll1.gravity = gravity.right; }else{ paramsll1.gravity = gravity.left; }*/ linearlayout listlayoutrow1 = new linearlayout(context); ll[i] = new linearlayout(context); ll[i].setorientation(linearlayout.horizontal); ll[i].setweightsum(10); ll[i].setlayoutparams(paramsll1); if(subchildren.length()==0){ workkardrowlayout.addview(ll[i]); }else{ (int j = 0; j < subchildren.length(); j++) { string type = "", field= "", backgroundcolor ="", textcolor ="", alignment ="",horizontalpadding ="", bold="",widthchild="",textcolorchild="",fontsize="",style="lower"; try { type = subchildren.getjsonobject(j).getstring("type"); } catch (exception e) { // todo auto-generated catch block e.printstacktrace(); } try { field = subchildren.getjsonobject(j).getstring("field"); fieldname=field; } catch (exception e) { // todo auto-generated catch block e.printstacktrace(); } try { backgroundcolor = subchildren.getjsonobject(j).getstring("backgroundcolor"); //ll[i].setbackgroundcolor(color.parsecolor(backgroundcolor)); } catch (exception e) { // todo auto-generated catch block e.printstacktrace(); } try { textcolor = subchildren.getjsonobject(j).getstring("textcolor"); } catch (exception e) { // todo auto-generated catch block e.printstacktrace(); } try { alignment = subchildren.getjsonobject(j).getstring("alignment"); } catch (exception e) { // todo auto-generated catch block e.printstacktrace(); } try { horizontalpadding = subchildren.getjsonobject(j).getstring("horizontalpadding"); } catch (exception e) { // todo auto-generated catch block e.printstacktrace(); } try { bold = subchildren.getjsonobject(j).getstring("bold"); } catch (exception e) { // todo auto-generated catch block e.printstacktrace(); } try { widthchild = subchildren.getjsonobject(j).getstring("width"); } catch (exception e) { // todo auto-generated catch block e.printstacktrace(); } try { textcolorchild = subchildren.getjsonobject(j).getstring("textcolor"); } catch (exception e) { // todo auto-generated catch block e.printstacktrace(); } try { fontsize = subchildren.getjsonobject(j).getstring("fontsize"); } catch (exception e) { // todo auto-generated catch block e.printstacktrace(); } try { style = subchildren.getjsonobject(j).getstring("style"); } catch (exception e) { // todo auto-generated catch block e.printstacktrace(); } int padding=0; try { padding = integer.parseint(horizontalpadding); } catch (exception e) { // todo auto-generated catch block e.printstacktrace(); } linearlayout.layoutparams llchild = new linearlayout.layoutparams(layoutparams.wrap_content, layoutparams.wrap_content); //paramsll1. = integer.parseint(horizontalpadding); //paramsll1.topmargin = 10; //paramsll1.bottommargin = 10; //paramsll1.rightmargin = 10; //paramsll1.gravity = gravity.left; if(rightalignmen.equalsignorecase("1")){ llchild.gravity = gravity.right; } if(type.equalsignorecase("label")){ textview listtext1 = new textview(context); if(style.equalsignorecase("upper")){ //listtext1.settypeface(null, typeface.bold); listtext1.settext(this.getworkkardmethod(field).touppercase()); }else{ listtext1.settext(this.getworkkardmethod(field)); } if(field.equalsignorecase("lossdate")){ listtext1.settext("loss date:"+this.getworkkardmethod(field)); } if(field.equalsignorecase("reporteddate")){ listtext1.settext("reported:"+this.getworkkardmethod(field)); } if (!backgroundcolor.equalsignorecase("")) { listtext1.setbackgroundcolor(color.parsecolor(backgroundcolor)); } listtext1.settextcolor(color.parsecolor(textcolor)); if (!fontsize.equalsignorecase("")) { listtext1.settextsize(integer.parseint(fontsize)); } listtext1.setpadding(padding,padding, padding, padding); if(alignment.equalsignorecase("left")){ ll[i].setgravity(gravity.left); } if(alignment.equalsignorecase("right")){ ll[i].setgravity(gravity.right); } if(alignment.equalsignorecase("centre")){ ll[i].setgravity(gravity.center); } if(bold.equalsignorecase("1")){ listtext1.settypeface(null, typeface.bold); } ll[i].addview(listtext1); ll[i].setlayoutparams(llchild); }else if(type.equalsignorecase("spacer")){ llchild.width=integer.parseint(widthchild); ll[i].setlayoutparams(llchild); textview listtext1 = new textview(context); listtext1.settext(" "); ll[i].addview(listtext1); } } workkardrowlayout.addview(ll[i]); } } } catch (exception e) { // todo auto-generated catch block e.printstacktrace(); } // linearlayout workkardrowlayout = new linearlayout(context); // workkardrowlayout.setorientation(linearlayout.vertical); // workkardrowlayout.setbackgroundcolor(color.parsecolor(cardbackground)); //if() // linearlayout listlayoutrow1 = new linearlayout(context); // linearlayout listlayoutrow2 = new linearlayout(context); // linearlayout listlayoutrow3 = new linearlayout(context); // // listlayoutrow1.setorientation(linearlayout.horizontal); // listlayoutrow2.setorientation(linearlayout.horizontal); // listlayoutrow3.setorientation(linearlayout.horizontal); // // listlayoutrow1.setweightsum(20); // listlayoutrow2.setweightsum(20); // listlayoutrow3.setweightsum(20); // // linearlayout.layoutparams paramsll1 = new linearlayout.layoutparams(300, layoutparams.wrap_content); // paramsll1.leftmargin = 10; // paramsll1.topmargin = 10; // paramsll1.bottommargin = 10; // paramsll1.rightmargin = 10; // paramsll1.gravity = gravity.left; // listlayoutrow1.setlayoutparams(paramsll1); // listlayoutrow2.setlayoutparams(paramsll1); // listlayoutrow3.setlayoutparams(paramsll1); // // textview listtext1 = new textview(context); // listtext1.settext(template); // textview listtext2 = new textview(context); // listtext2.settext("hurre............ dynamic lauout row2:-)"); // textview listtext3 = new textview(context); // listtext3.settext("hurre............ dynamic lauout row 3:-)"); // // listlayoutrow1.addview(listtext1); // listlayoutrow2.addview(listtext2); // listlayoutrow3.addview(listtext3); // // workkardrowlayout.addview(listlayoutrow1); // workkardrowlayout.addview(listlayoutrow2); // workkardrowlayout.addview(listlayoutrow3); return workkardrowlayout; } string getworkkardmethod(string fieldname){ string work=""; if(fieldname.equalsignorecase("template")){ work=workkarddata.gettemplate(); }else if(fieldname.equalsignorecase("workkardtitle")){ work=workkarddata.getworkkardtitle(); }else if(fieldname.equalsignorecase("workkarddescription")){ work=workkarddata.getworkkarddescription(); }else if(fieldname.equalsignorecase("worktype")){ work=workkarddata.getworktype(); }else if(fieldname.equalsignorecase("workkardnumber")){ work=workkarddata.getworkkardnumber(); }else if(fieldname.equalsignorecase("claimantname")){ work=workkarddata.getclaimantname(); }else if(fieldname.equalsignorecase("reporteddate")){ work=workkarddata.getreporteddate(); }else if(fieldname.equalsignorecase("lossdate")){ work=workkarddata.getlossdate(); }else if(fieldname.equalsignorecase("losstype")){ work=workkarddata.getlosstype(); }else if(fieldname.equalsignorecase("address")){ work=workkarddata.getaddress(); }else if(fieldname.equalsignorecase("county")){ work=workkarddata.getcounty(); }else if(fieldname.equalsignorecase("state")){ work=workkarddata.getstate(); }else if(fieldname.equalsignorecase("zip")){ work=workkarddata.getzip(); } return work; }
here things can improve view's performance:
- reuse views(you inflating view every single instance). if have variable number of fields adapter.getviewtype , adapter.getviewtypecount friends.
- findviewbyid's expensive , make less performant experience. read on viewholder pattern.
- if still running problems need @ causing poor performance. hunch if still have poor performance after doing 1 , 2 it's parsing json in getview. consider preparsing data objects can read once getview called.
supplemental video(long useful adapters in general).
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