android-listview | 易学教程

ListView not “refreshing” after item is deleted from it

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问题 I am trying to figure out how I "Refresh" the list view the user is on when an item from my listview is deleted. I have tried notifyDataSetChanged() but to no avail, which is puzzling to me because this works when I add an item. P.S. I know the item is getting deleted because if I press the back button and get to my activity again, the item is removed from the listview visually. public void deleteButtonClicked(View view){ dbHandler.deleteExerciseFromDatabase(exerciseClickedbyUser,

Update common post in different ListView with different data in adapter

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问题 Assume That an app Firstly List all post in a ListView in Fragment ( 1st ) with a custom adapter. and that custom adapter data is ArrayList<Hashmap<String,String>> Then users can go to another fragments like category fragment ( 2nd ), that we have another listview with different data. We using back stack for fragments and user can back to prev fragment by clicking back button. Issue: in these fragments some post can be common! Like image attached, in first image, we can see a post in all post

In Custom List view check box is unchecked when I scrolling

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问题 I know that this question has been asked over and over again but still I've not been able to find a helpful suggestion. Check box is getting unchecked when I scroll the List view. I am using Array List to store id of a selected item in the list view when particular item is unchecked it is removed from List view. public class ManagePracticeLogAdapter extends BaseAdapter { Context context; LayoutInflater inflater; MenuItem menu,addlog; List<Integer> SelectedBox; ArrayList<HashMap<String, String

accessing custom objects in a listview

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I'm currently building an app that has a request being sent into the web, the result then gets parsed and put into an ArrayList of objects. this list then, populates a ListView. I want to create an onClickListener that will allow me to know which object was clicked, but I can't find the correct way to implement this. either assign the onClick to the ListView in the original activity, or, assign the listener within the getView function in the custom adapter. it seems to me like assigning the listeners in the getView has too much overhead. how does it work? what is better? code for main activity

CheckBox will uncheck and check when scrolling down the listview

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问题 In my application I use this to count the checked checkbox in real time meaning when tick the box the count above will increase or decrease. but when scrolling down the listview the checked box will be uncheck. any suggestion or problem in my codes? MainActivity public class Main2Activity extends AppCompatActivity { ListView lstdept; CheckBox list_view_item_checkbox; SimpleAdapter ADAhere; Connection con; String un, pass, db, ip, z,country; int test = 0; ArrayList<String> selectedItems = new

ListView widget with multiple pending intents

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I'm using widget with listview that has 3 types of items. For each type of item I should use different pending intents. Currently I'm using following code: public class MyWidgetProvider extends AppWidgetProvider { @Override public void onUpdate(Context context, AppWidgetManager widgetManager, int[] widgetIds) { for (int widgetId : widgetIds) { RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget_view); bindEmptyView(remoteViews); bindRemoteAdapter(context, widgetId, remoteViews); bindIntentTemplate(context, widgetId, remoteViews); widgetManager.updateAppWidget

ListView Scrolling Issue: on Item Selection

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问题 I have Listview with which I'm trying to display my custom Adapter.Everything works fine except when I select list item and scroll it,the items which were not selected are already being selected.I don't really understand what's the issue with my listview. Here's my class: @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.select_contact_layout); getActionBar().setHomeButtonEnabled(true);

Listview recycles and shows duplicated images

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问题 I have created a listview which consists of list of tracks and play and pause image.When clicked on play image, pause image becomes visible and clicking on pause ,play image will become visible.Issue is that when i click on play and scrolls down i see another list item showing pause image and when i scroll down more another list item showing pause image.It is because list recylces an shows duplicated images.On studying the issue i think i need to place if-else statement in the getView method

Show TextView for an empty ListView inside a FrameLayout

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问题 I have a tabbed layout and an activity using tabs as views. It has three tabs as ListViews . If either of the lists is empty I want to show a simple TextView instead. I've gone through many posts but all of them talk about a single ListView inside a LinearLayout . I'm not sure if it is not working because of multiple ListViews or FrameLayout . Can we not set visibility = GONE inside a FrameLayout ? Because even then the TextView is always shown along with the ListView . Can anyone suggest

Need help creating a list of YouTube Videos

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问题 I want to access Youtube videos and display the thumbnail of the video along with its title in a ListView. On clicking of the thumbnail, the video should be played. Can anyone suggest some sample program related to my need or link. 回答1: Here my code for playing you-tube Video using Urls. This may not provide the complete requirement of yours but you can make use of it. My VideoPlayActivity.class (Activity) import java.io.File; import android.annotation.SuppressLint; import android.app