android-listview - w3toppers.com

how to implement a long click listener on a listview

You have to set setOnItemLongClickListener() in the ListView: lv.setOnItemLongClickListener(new OnItemLongClickListener() { @Override public boolean onItemLongClick(AdapterView<?> arg0, View arg1, int pos, long id) { // TODO Auto-generated method stub Log.v(“long clicked”,”pos: ” + pos); return true; } }); The XML for each item in the list (should you use a custom XML) must have android:longClickable=”true” as … Read more

Android. How does notifyDataSetChanged() method and ListViews work?

I’ve figured it out. I couldn’t understand how the hell the adapter started and how did it know where to get the data from. When i extended the BaseAdapter class, in the constructor of that class I initialized the list of items that I wanted to see in the ListView. But I couldn’t figure out … Read more

How do I create a ListView with rounded corners in Android?

Here is one way of doing it (Thanks to Android Documentation though!): Add the following into a file (say customshape.xml) and then place it in (res/drawable/customshape.xml) <?xml version=”1.0″ encoding=”UTF-8″?> <shape xmlns:android=”http://schemas.android.com/apk/res/android” android:shape=”rectangle”> <gradient android:startColor=”#SomeGradientBeginColor” android:endColor=”#SomeGradientEndColor” android:angle=”270″/> <corners android:bottomRightRadius=”7dp” android:bottomLeftRadius=”7dp” android:topLeftRadius=”7dp” android:topRightRadius=”7dp”/> </shape> Once you are done with creating this file, just set the background in … Read more

Programmatically scroll to a specific position in an Android ListView

For a direct scroll: getListView().setSelection(21); For a smooth scroll: getListView().smoothScrollToPosition(21);

Custom ListView click issue on items in Android

The issue is that Android doesn’t allow you to select list items that have elements on them that are focusable. I modified the checkbox on the list item to have an attribute like so: android:focusable=”false” Now my list items that contain checkboxes (works for buttons too) are “selectable” in the traditional sense (they light up, … Read more

Converting JSONarray to ArrayList

ArrayList<String> listdata = new ArrayList<String>(); JSONArray jArray = (JSONArray)jsonObject; if (jArray != null) { for (int i=0;i<jArray.length();i++){ listdata.add(jArray.getString(i)); } }

Android ListView Selector Color

The list selector drawable is a StateListDrawable — it contains reference to multiple drawables for each state the list can be, like selected, focused, pressed, disabled… While you can retrieve the drawable using getSelector(), I don’t believe you can retrieve a specific Drawable from a StateListDrawable, nor does it seem possible to programmatically retrieve the … Read more

How ListView’s recycling mechanism works

Initially, I was also unaware of listview recycling and the convertview usage mechanism, but after a whole days research I pretty much understand the mechanisms of the list view by referring to an image from android.amberfog Whenever your listview is filled by an adapter it basically shows the number of Rows that the listview can … Read more