java - Dynamically add items to list view using custom adapter for Android app -

-

so, right have custom adapter class takes in array of locations , adds them listview. fine , dandy, add locations listview after initialization. example, can "add location" , add listview. here main activity:

package com.example.listviewtest;  import android.app.activity; import android.os.bundle; import android.view.view; import android.widget.listview;  public class mainactivity extends activity {  private listview listview1;  @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      location location_data[] = new location[]     {         new location(r.drawable.ic_launcher, "location 1", "fruit!", "2 miles", "8-4 mon-fri\nclosed sun"),         new location(r.drawable.ic_launcher, "location 2", "veggies!", "2 miles", "8-5"),         new location(r.drawable.ic_launcher, "location 3", "plants!", "2 miles", "8-5"),         new location(r.drawable.ic_launcher, "location 4", "flowers!", "2 miles", "8-5"),         new location(r.drawable.ic_launcher, "location 5", "baked goods!", "2 miles", "8-5")     };     locationadapter adapter = new locationadapter(this,              r.layout.listview_item_row, location_data);     //adapter.add(new location(r.drawable.ic_launcher, "location 6", "veggies!", "2 miles", "8-5"));       listview1 = (listview)findviewbyid(r.id.listview1);      view header = (view)getlayoutinflater().inflate(r.layout.listview_header_row, null);     listview1.addheaderview(header);      listview1.setadapter(adapter); } }

this works. want adapter.add(new location(r.drawable.ic_launcher, "location 6", "veggies!", "2 miles", "8-5")); after filling array.

here locationadapter class:

package com.example.listviewtest;  import android.app.activity; import android.content.context; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.widget.arrayadapter; import android.widget.imageview; import android.widget.textview;  public class locationadapter extends arrayadapter<location>{  context context;  int layoutresourceid;     location data[] = null;  public locationadapter(context context, int layoutresourceid, location[] data) {     super(context, layoutresourceid, data);     this.layoutresourceid = layoutresourceid;     this.context = context;     this.data = data; }  @override public view getview(int position, view convertview, viewgroup parent) {     view row = convertview;     locationholder holder = null;      if(row == null)     {         layoutinflater inflater = ((activity)context).getlayoutinflater();         row = inflater.inflate(layoutresourceid, parent, false);          holder = new locationholder();         holder.imgicon = (imageview)row.findviewbyid(r.id.imgicon);         holder.txttitle = (textview)row.findviewbyid(r.id.txttitle);         holder.details = (textview)row.findviewbyid(r.id.details);         holder.distance = (textview)row.findviewbyid(r.id.distance);         holder.hours = (textview)row.findviewbyid(r.id.hours);          row.settag(holder);     }     else     {         holder = (locationholder)row.gettag();     }      location location = data[position];     holder.txttitle.settext(location.title);     holder.imgicon.setimageresource(location.icon);     holder.details.settext(location.details);     holder.distance.settext(location.distance);     holder.hours.settext(location.hours);      return row; }  static class locationholder {     imageview imgicon;     textview txttitle;     textview details;     textview distance;     textview hours; } }

any ideas on how can implement this? thanks.

  1. in adapter change locations data[] array arraylist , override appropriate constructor
  2. in activity, make variable data field (type arraylist
  3. when add location can use data.add(location)
  4. then can call notifydatasetchanged() on adapter

example code: http://androidadapternotifiydatasetchanged.blogspot.in/


Comments

Post a Comment

Popular posts from this blog

php - render data via PDO::FETCH_FUNC vs loop -

-
i've been using 2 methods render data. the first one: function name($id,$name){ return '<div id="'.$id.'">'.$name.'</div>'; } echo implode($pdo->query("select id,name user")->fetchall(pdo::fetch_func,'name')); the second one: $users = $pdo->query("select id,name user")->fetchall(pdo::fetch_obj); foreach($users $user){ echo name($user->id,$user->name); } i don't understand how pdo::fetch_func works. tried figure out. however, not well-documented. could please explain fetch mode? , also, 1 performs better? thank you. both methods wrong , have learn how use templates , how separate business logic presentation logic. $users = $pdo->query("select id,name user")->fetchall(pdo::fetch_obj); tpl::assign('users', $users); is code business logic part. then in template <?php foreach $users $row): ?> <div id="<?=$...
Read more

c++ - OpenCV Error: Assertion failed <scn == 3 ::scn == 4> in unknown function, -

-
i read alot other solution still confused should mine... #include <opencv2/objdetect/objdetect.hpp> #include <opencv2/highgui/highgui.hpp> #include <opencv2/imgproc/imgproc.hpp> #include <iostream> #include <stdio.h> using namespace std; using namespace cv; int main(int argc, const char** argv) { //create cascade classifier object used face detection cascadeclassifier face_cascade; //use haarcascade_frontalface_alt.xml library face_cascade.load("haarcascade_frontalface_alt.xml"); //setup video capture device , link first capture device videocapture capturedevice; capturedevice.open(0); //setup image files used in capture process mat captureframe; mat grayscaleframe; //create window present results namedwindow("outputcapture", 1); //create loop capture , find faces while (true) { //capture new image frame capturedevice >> captureframe; ...
Read more

The canvas has been tainted by cross-origin data in chrome only -

-
uncaught securityerror: failed execute 'getimagedata' on 'canvasrenderingcontext2d': canvas has been tainted cross-origin data i getting above error in chrome. code(following) works fine in mozilla. have not corss domain issue. why above error in chrome? var wheel_canvas, wheel_context, can_w, can_h, wheel_grd; var large_radius = 160; var small_radius = 120; var wheel_canvas = document.getelementbyid('wheel_canvas'); var wheel_context = wheel_canvas.getcontext('2d'); var can_w = $(wheel_canvas).width(); var can_h = $(wheel_canvas).height(); var centerx = can_w / 2, centery = can_h / 2; var wheel_grd = null; test('#ff0000'); function test(hex) { $('#clrpicker').css({'left': 210, 'top': 210 }); inverted = hexbw(hex); $('#color_val_show').val(hex); current_color_hex_val_selected = hex; $('#color_val_show').css({'color':inverted,'background':hex}); fillgradient...
Read more