android-arrayadapter

问题 I have a list view being populated by my array adapter. Now everything works fine until i click on a row which launches an async task. My async task is supposed to download some image urls and launch an intent service in it's onPostExecute to download the images and store them on the SDcard. All this works fine but once i hit back and relaunch the fragment mid the network operations, my listview is empty and remains empty until the intent service is done. What could be the problem here? I

问题 I want to list my ArrayList items to the simple list view. I tried to convert ArrayList(iller) to StringArray(mListe) but I couldn't. It gives me always NullPointerException. What is my mistakes and how can I solve this problem Thank you for any help. This is my List Fragment; public class ListeFragment extends ListFragment { public View mView; public String[] mListe; public ListView listView; public ArrayList<String> iller = new ArrayList<String>(); @Override public View onCreateView

问题 I have defined a custom view (xml) for my ArrayAdapter for a ListView , which adds a Button . I'd like to create an OnClickListener for this Button per row, but without creating a custom adapter. Is that possible, or does Android force me to create a custom ArrayAdapter for my ListView ? Here's a snippet of what I'm doing: glAdapter = new ArrayAdapter<Group>(getActivity(), R.layout.fragment_grouprow, R.id.groupRowText, ListOfGroups); ListView groupListView = (ListView)mainView.findViewById(R

问题 I have two activities , in the main one I have a text field and two buttons , the user can enter text in the text field . When clicking the add button ,text will be added to some ArrayList . When clicking show in list button a new activity with its own fragment should open showing a listview that contains the names that the user has entered. I used ArrayAdapter and this is working fine. When I am in the list activity and when I click the back button of the device everything goes fine and the

问题 Problem description: I wanted a "delete" function which could perform delete/remove of the selected entry in a listview and at the same time delete the residing video file string in the Video_List directory then it refresh the content of the listview? I'm rather new in android/java can someone help me with it? Do scroll down to evaluate the problem i'm facing please!! Can someone tell me what is the specific code i should add into my current codes to perform the above mention function?? 回答1:

问题 I'm facing this error in displaying a List View. The problem is in the adapter but I couldn't find the solution. This in my logcat : FATAL EXCEPTION: main java.lang.NullPointerException at com.client.alm.WorkItemAdapter.getView(WorkItemAdapter.java:68) at android.widget.AbsListView.obtainView(AbsListView.java:2159) at android.widget.ListView.measureHeightOfChildren(ListView.java:1246) at android.widget.ListView.onMeasure(ListView.java:1158) at android.view.View.measure(View.java:15513) at

问题 I have added below codes in onResume() method in my android activity. username.addTextChangedListener(this); usernames_adapter = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, users.getUserList()); username.setAdapter(usernames_adapter); usernames_adapter.setNotifyOnChange(true); I'm inserting data into database using sql script. i need to show inserted data on username ( username is a AutoCompleteTextView) just after inserting. so i used usernames_adapter

问题 i didn't see any data in listView i get all data from web-service but i didn't see it inside ListView. I get flow and i understand it never go inside getView() method Please explain me what's wrong going in that code and suggest me best-one. public class WeatherReport extends Activity { ListView listView; GPS_Location gpsObj; BaseAdapter aAdapter; double Latitude, Longitude; Bitmap image; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);

问题 I am trying to set array adapter and have following code in place: private String[] mServices; private ListView mDrawerList; //Ends Here @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //For Navigation Drawer mServices = getResources().getStringArray(R.array.drawer_services); mDrawerList = (ListView) findViewById (R.id.left_drawer); mDrawerList.setAdapter(new ArrayAdapter<String>(this, R.layout.drawer

问题 From the Android development page we have the following quote for Custom ArrayAdapter of ListViews: "there is absolutely no guarantee on the order in which getView() will be called nor how many times." When I have the following and getView is called a few times, it's no problem, since I'm just recycling the Views instead of inflating them again: @Override public void getView(int position, View convertView, ViewGroup parent){ Log.i(TAG, "getView of position " + String.valueOf(position) + " is