baseadapter

Android适配器之基于BaseAdapter定义AbslistView万能适配器

蹲街弑〆低调 提交于 2019-12-19 04:23:11
推荐优先本地搜索浏览 Android适配器之DataModifyHelper数据操作类的封装 定义BaseAdapter抽象基类,抽取共性部分,即实现getCount、getItem、getItemId 观察源码可知,在构造函数中实例化DataModifyHelper对象,该对象负责数据的增删改查等操作。适配器中提供getDataModifyHelper方法,供外界获得操作数据的 DataModifyHelper帮助类。 public abstract class AbsUnityBaseAdapter<T> extends BaseAdapter implements INotifyAdapterDataSetChange { private static final UtilsLog lg = UtilsLog.getLogger(AbsUnityBaseAdapter.class); private LayoutInflater layoutInflater; private IAdapterDataModifyHelper<T> IAdapterataModifyHelper; /** * 构造方法 */ protected AbsUnityBaseAdapter() { this.IAdapterataModifyHelper = new DataModifyHelper

Android BaseAdapter的使用

一世执手 提交于 2019-12-18 13:23:08
数据适配器有很多种,今天在这里记录一下最通用是适配器BaseAdapter。 首先说一下什么是适配器,这里我从网上找到一幅图片 由上图我们不难看出,所谓的适配器,就是数据与视图之间的桥梁。由它把数据绑定到ListView控件上。 具体怎么绑定呢,今天就来记录一下。首先我们先看一下效果图。 这是我写的一个简单的图片、标题、内容布局。关于ListView 我还想说明一点,就是它的缓存机制。它把所有当前页面不显示的内容都放到缓存里,当页面往上滑动时,超出屏幕的部分也会放到缓存里,新显示的部分会直接从缓存里面取。 1、首先新建一个Android.XML文件,用来显示ListView每一行将要显示样式。 <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <ImageView android:id="@+id/item_img" android:layout_width="60dp" android:layout_height="60dp" android:layout

What does having BaseAdapter.hasStableIds() return true solve?

╄→尐↘猪︶ㄣ 提交于 2019-12-18 09:19:07
问题 I have been trying to understand how BaseAdapter.hasStableIds() works. From what I have read, returning true from this method helps the adapter determine if the views must be recreated or left the same. I am guessing the adapter is somehow mapping the position to an id, and if the mapping stays the same, the adapter does nothing when notifyDataSetChanged() is called. But wouldn't this be a problem if the data has been changed while the id(and the position) remains the same? If this is indeed

Android - Gridview with Custom BaseAdapter, get clicked View at position

北城以北 提交于 2019-12-18 05:08:05
问题 I have created a gridview which displays the letters of the alphabet. I populate the gridview with a string array using a custom BaseAdapter. What i want to do is to be able to get the Button View at a position in the GridView. For example i want to be able from my gridView.setOnItemClickListener(); to get-set the BackgroundColor of the Button that was clicked. So far i am able to get the just the text form the string array at a position, but i don't know how i can get the clicked Button.

How to implement getFilter on a BaseAdapter?

杀马特。学长 韩版系。学妹 提交于 2019-12-17 19:11:52
问题 I am trying to implement a getFilter() on a base adapter to filter out search results on a List. Is there any example of how to implement a getFilter()? MainActivity.java final AppInfoAdapter adapter = new AppInfoAdapter(this, Utilities.getSystemFilteredApplication(this), getPackageManager()); public void onTextChanged(CharSequence s, int start, int before, int count) { adapter.getFilter().filter(s); //Filter from my adapter adapter.notifyDataSetChanged(); //Update my view } AppInfoAdapter

What's the difference between BaseAdapter and ArrayAdapter?

北城余情 提交于 2019-12-17 17:24:55
问题 I want to know the difference between using BaseAdapter and ArrayAdapter . I have been achieving what I want through ArrayAdapters . Does it affect the performance of the ListView on the adapter interface in which it is implemented ? And, the last question is, can i achieve anything doing with ListView using any of these Adapters , or, there are certain cases where specific adapter only can be used? 回答1: Here is the difference: BaseAdapter is a very generic adapter that allows you to do

Android - Unable to increment or decrement value from list item

邮差的信 提交于 2019-12-17 16:42:06
问题 Hi everyone i am using custom listview for getting data from server and show in listview.. I am able to get data and show it in listview but i dont know to implement the click event of button inside listitem. There are two buttons to increement and decrement qty. My clicklistener is working but its not working in right manner. Please help me correcting this issue. I did search too many postrs in stack overflow but was unable to understand it... Here is my adapter class private Activity

Android, List Adapter returns wrong position in getView

丶灬走出姿态 提交于 2019-12-17 10:37:15
问题 I have found a mysterious problem that may be a bug! I have a list in my fragment. Each row has a button. List shouldn't respond to click however buttons are clickable. In order to get which button has clicked I have created a listener and implement it in my fragment. This is the code of my adapter. public class AddFriendsAdapter extends BaseAdapter { public interface OnAddFriendsListener { public void OnAddUserClicked(MutualFriends user); } private final String TAG = "*** AddFriendsAdapter *

BaseAdapter class wont setAdapter inside Asynctask - Android

≯℡__Kan透↙ 提交于 2019-12-17 10:03:29
问题 I have asynctask that gathers usernames, comments, and numbers. It places them into strings and is then suppose to call a BaseAdapter class, create an adapter, and set the adapter to the class. But my code doesn't work, it crashes the app, here is my code public class DashboardActivity extends ListActivity { String comments[]; String usernames[]; String numbers[]; ListView lstComments; class CreateCommentLists extends BaseAdapter{ Context ctx_invitation; String[] listComments; String[]

notifyDataSetChange not working from custom adapter

余生颓废 提交于 2019-12-17 02:26:56
问题 When I repopulate my ListView , I call a specific method from my Adapter . Problem : When I call updateReceiptsList from my Adapter , the data is refreshed, but my ListView doesn't reflect the change. Question : Why doesn't my ListView show the new data when I call notifyDataSetChanged ? Adapter : public class ReceiptListAdapter extends BaseAdapter { public List<Receipt> receiptlist; private Context context; private LayoutInflater inflater; private DateHelpers dateH; public ReceiptListAdapter