baseadapter | 易学教程

How to refresh ListView dynamically?

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问题 I am making a ListView with TextView and 1 delete button for each row. To populate the list I am using my custom adaptor (extends base adapter) and sqlite db to map into list. My requirement is onclick of delete button in a row that record should be deleted and list should refresh. I am able to delete record from db but my list is not refreshing until I rotate the device or assign a new instance of my adapter from activity. I have tried following answer but didn't work in my case. the

How to add data to custom BaseAdapter for listView - Android

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问题 I have a custom BaseAdapter class that creates views for comments, usernames, and numbers. This BaseAdapter receives this information from An AsyncTask. The AsyncTask runs when the user reaches the bottom of the listView. The problem is the BaseAdapter wont add new data. When I try to add new data it deletes the current data in the list and then adds the new data. I want it to keep all the data and just add data to the bottom of the listView. All of these classes are in the same Activity.

All beacons are not shown in Android using altBeacon library

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问题 I am using the AltBEacon Android library for developing an iBeacon app for Android devices . I am scanning for beacons, however, only two out of four beacons are found (sometimes 1/4). I increase mBeaconManager.setForegroundScanPeriod(5000l); to 5 seconds, but still same result. I am not sure if the CustomAdapter I use for binding details to view is wrong or the issue is do with the mobile device (I am using Galaxy Note II - Android 4.4.2 (KitKat))? Can anyone locate my mistake? Another issue

Android: ListView not refreshing on notifyDataSetChanged();

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I've got a custom BaseAdapter and an add button in the main activity. The button opens a dialog with a textbox and you can add new elements to the list that way. The problem is that the list is not refreshing. In the onActivityResult() function I print the number of elements in the list and each time I hit OK in the dialog box the number increases, so I know it's just the refreshing that doesn't work. My BaseAdapter and my activity: class ListaOrase extends BaseAdapter{ private Activity context; ArrayList<String> orase; public ListaOrase(Activity context){ this.context=context; orase=new

How to get context for BaseAdapter in Android

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问题 I have a class named BinderData which extends BaseAdapter . I want to get the base class context. I tried to use getContext() but that doesn't work in case of BaseAdapter . How can I get the Context of this class? 回答1: One more solution- If you have a parent, you can directly access the context like so- public class SampleAdapter extends BaseAdapter { LayoutInflater inflater; @Override public View getView(int position, View convertView, ViewGroup parent) { if(inflater == null){ Context

Android communication between fragment and baseadapter

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Need expert opinion how should i structure this issue. I have a custom method process_filter that resides in a fragment as it needs to access a private TextView and List of this fragment. In the middle of processing, this fragment will access a BaseAdapter and inside this BaseAdapter I need to use back process_filter method Basically here is the structure: MyFragment.java public class MyFragment extends Fragment { private List<String> filter_list; private TextView no_of_filter; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View

Android: ListView not refreshing on notifyDataSetChanged();

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问题 I've got a custom BaseAdapter and an add button in the main activity. The button opens a dialog with a textbox and you can add new elements to the list that way. The problem is that the list is not refreshing. In the onActivityResult() function I print the number of elements in the list and each time I hit OK in the dialog box the number increases, so I know it's just the refreshing that doesn't work. My BaseAdapter and my activity: class ListaOrase extends BaseAdapter{ private Activity

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

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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. activity_main.xml <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools=

Filtering a ListView with Baseadapter filters text not images

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There was some progress made to the earlier problem. Now there is a new problem. The text in the GridView shows the correct result. However, the images are the same as at the start of the list. For example: If I search for " Sidd " it displays three results but the photos still start as for the users starting with " A ". Attached is a screenshot for clarity. This is the BaseAdapter code: public class TagFriendsAdapter extends BaseAdapter implements Filterable { List<String> arrayListNames; List<String> mOriginalNames; List<String> arrayPictures; List<String> mOriginalPictures; Activity

Android - How to implement a NavigationDrawer that is partially visible at all times?

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I would like to have a NavigationDrawer in my Android project that shows the ListView partially at all times, and the items are also clickable, but when the user drags the drawer full ListView appears. Below image is what I'm trying to achieve: First one is the "Normal view" where you can see the small icons. Second one is when the user slides the navigation drawer so that it opens. Third one is when back in the normal view the user clicks A and C, so that the icons change their colour. Any recommendations how to do this? Thanks for answering :) I came across this open source library, https:/