adapter | 易学教程

How to update listview when back pressed from another activity android?

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问题 Hi how to update listView when back pressed in another activity. I am using database, where i am deleting particular row in one Activity , if back pressed alone, it's not updating. When i switch over to some other activity or app closed and open it's working fine where listView gets updated. Here is code.. public class FragmentLiveChats extends Fragment { private AdapterLiveChat adapterChatHistory; private List<LiveChatDetails> customerDetail; private ListView mListView; private List

How to check if my listview adapter is filterd by my editext text or not?

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问题 I have a editext for search in a list view. I want to check if listview adapter is filtered by any text or not. Here is my code: Button search=(Button)findViewByld(R.id.bsearch); search.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { MainActivity.this.adapter.getFilter().filter(inputSearch.getText().toString()); //HERE IS MY PROBLEM if(adapter was filtered by a text) { // Do some things } }}); } } Hope to get my purpose. Thanks a lot. 回答1: Filter has a

How to select/deselect all checkBox?

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问题 I have an adapter with an imageview,a textView and a Checkbox and a button "Select all" for selecting all the checkbox. I searched a lot about how can I do this (select all checkbox) but it not worked. Can anyone explain more what should I do? Please...I have to do this urgent Here is my adapter : Public class LazyAdapter1 extends BaseAdapter { private Activity activity; private String[] data; private String[] nume; private LayoutInflater inflater=null; public ImageLoader imageLoader; public

Custom ListView Adapter throws UnsupportedOperationException

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问题 This is the tutorial that I followed to use a custom Listview Adapter. The problem I am having is that when I try to clear the adapter, the app crashes and throws java.lang.UnsupportedOperationException if(adapter != null) { adapter.clear(); } UPDATED CODE: private void setListViewAdapterToDate(int month, int year, int dv) { if(summaryAdapter != null) { summaryAdapter.clear(); } setListView(month, year, dv); summaryList.addAll(Arrays.asList(summary_data)); summaryAdapter = new SummaryAdapter

Change layout of selected list item in Android

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问题 I need to create a ListView and show more detailed layout only for the selected row in order to show more information to the costumer. What I tried is below: newsListView.setAdapter(new NewsListAdapter(this, news)); newsListView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { LayoutInflater inflater = (LayoutInflater)getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE); //Here

Change layout of selected list item in Android

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android : checkboxes in a ListView ( strange behaviour of selected element)

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问题 I found here and here similar issues, but the problem is slightly different. In a ListView, I try to put an adapter (extends from base Adapter) which contents checkbox. List view layout: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" style="@style/mainLayout" > <Button android:id="@+id/close_cat" android:layout_width="match_parent" android:layout_height="wrap_content" android:onClick="buttonClick" android:text="@string/back" />

Why this Error occurred? java.lang.RuntimeException: ImageLoader must be init with configuration before using

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问题 I have downloaded one ImageDownloader code from gitHub(from Here) Now when I am trying to download the image from my webservice I am getting this Runtime Exception "ImageLoader must be init with configuration before using". I am not able to figure it out. And this my adapter: public class CustomAdapter extends BaseAdapter { private Context context; private ArrayList<String> logo_URL; private ListContent listContent; private ArrayList< TeamDataClass> teamdata = null; private ArrayList

结构型模式(一) 适配器模式（Adapter）

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一、动机（Motivation）在软件系统中，由于应用环境的变化，常常需要将“一些现存的对象”放在新的环境中应用，但是新环境要求的接口是这些现存对象所不满足的。如何应对这种“迁移的变化”？如何既能利用现有对象的良好实现，同时又能满足新的应用环境所要求的接口？二、意图（Intent）将一个类的接口转换成客户希望的另一个接口。Adapter模式使得原本由于接口不兼容而不能一起工作的那些类可以一起工作。例说Adapter应用这种实际上是一种委派的调用，本来是发送请求给MyStack，但是MyStack实际上是委派给list去处理。MyStack在这里其实就是Adapter（适配对象），list即是Adaptee（被适配的对象），而IStack就是客户期望的接口。太直接了，没什么可说的。三、结构（Structure）适配器有两种结构 1、对象适配器（更常用）对象适配器使用的是对象组合的方案，它的Adapter和Adaptee的关系是组合关系，即上面例子中MyStack和list是组合关系。 OO中优先使用组合模式，组合模式不适用再考虑继承。因为组合模式更加松耦合，而继承是紧耦合的，父类的任何改动都要导致子类的改动。上面的例子就是对象适配器。 2、类适配器（不推荐使用）下面的例子是类适配器。 Adapter继承了ArrayList，也继承了IStack接口

Using AsyncTask to load images into a custom adapter

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问题 Although there are many tutorials out there, I've found it really difficult to implement an AsyncTask to load images from URI's (obtained from a content provider) into a custom adapter. I get the basic gist, which is to have a class containing an AsyncTask, do the bitmap creation in the 'doInBackground', and then set the ImageView in the onPostExecute. The problem for me, being new to android & programming, is that I don't know how to pass in my Uri's to the AsyncTask for each item, how to