android-arrayadapter

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . I have successfully implemented a listView where each row is an object I've created. I have an interface which reads some objects and returns an array of them, which I pass to the adapter constructor. What I want to do is, since the list may be very long, My interface allows to read each time some more items

问题 I have a problem. I'm attempting to change an icon in my listview after it has been clicked. It works correctly although are not modified only the clicked icons but also those who are not displayed. For example if I click the icon in the first item of the listview, also the fifth icon changes. This behaviour is repeated for all the following items (every five items of the listview). This is my getView method: public class AlphabeticalAdapter extends ArrayAdapter<String> { int layoutResourceId

问题 This question already has answers here : Android ListView Refresh Single Row (6 answers) Closed 5 years ago . Is it possible to redraw a single row in a ListView ? I have a ListView with rows that are LinearLayout s. I listen to a preference change and sometimes I need to change just one View inside the LinearLayout of a single row. Is there a way to make it redraw that row without calling listview.notifyDatasetChanged() ? I've tried calling view.invalidate() on the view (inside the

问题 I am populating the recycler view with new data on Activity result.The problem is the new data is getting append at the end of the recycler view how do I clear the previous data in the recycler view and inflate the recycler view with the new data. @Override protected void onActivityResult(int requestCode, int resultCode, final Intent data) { super.onActivityResult(requestCode, resultCode, data); mAdapter.notifyDataSetChanged(); search_info.clear(); book_type.clear(); if (requestCode == 1) {

问题 how do I set this arrayAdapter to my listView so it populates the listView on my screen? for example: listview.setAdapter(MyAdapter); here is the code for my MainActivity and ListAdapter: public class MainActivity extends Activity { CheckBoxInfo cbr; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); cbr = new CheckBoxInfo(); cbr.checkBoxName = "dfdjklfjdkljf"; cbr.checkBoxState = true; ListView listview =

问题 I just want to start off with loading 1 picture using Picasso using ArrayAdapter. I think i'm missing something minor (hopefully). Just wondering if someone can point me to right direction. I'm getting a NullPointer Exception. This is the MainActivity source code: public class MainActivity extends AppCompatActivity { ListView listView; ArrayList<DataModel> dataModel; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout

问题 I have an Activity which extends ListView The ListView that I use is an extension of ArrayAdapter and each row of the ListView primarily consists of a WebView The problem is that touching the WebView does not call OnListItemClick . Any thoughts on how I can be able to touch the webview and call OnListItemClick? Or is there something else that I'm doing wrong? Thanks! Here is a skeleton of the Activity class, along with the relevant XML files for the layout PS, I've tried setting android

问题 I'm trying to make a dynamic Custom ListView, where a user can enter a name and age, an unknown amount of times. credit to @Razgriz he helped me get the Custom ListView working. I am now trying to make it dynamic. My issue is when I instantiate the NameAndAgeClass object thru the constructor, my arraylist will show what i entered thru the onclick, but it is also showing the original instantiation a bunch of times as well, in the NameAndAgeClass class i tried to create 2 arraylists for the

问题 I've been messing around with custom ArrayAdapters for ListViews a bit, and when extending them I've always simply passed -1 (A non-existent resource id) as the resource argument to super. Are there any potential benefits (at all) to passing anything else in it's place when you also override getView? 回答1: super(context, R.layout.list_item_layout, R.id.item_text_inside_layout, items); the 3rd parameter is usefull when you want to use custom layout for ListView/Gridview. ArrayAdapter use Object

问题 I have a spinner on my page, which is populated using an arrayAdapter . When i launch my app everything is ok, but the moment i click on the spinner , the app crashes and logcat gives me no reference to a line in my code. Here is the area of the code referring to the spinner: profiles = (Spinner) findViewById(R.id.spinner1); SetSql getprofiles = new SetSql(this); getprofiles.open(); spinnerArray = getprofiles.getProfiles(); if(spinnerArray[0]==null){ spinnerArray = new String[1]; spinnerArray