사용자 지정 ListView를 만들려고합니다. 노트 제목과 각각의 TextView에 노트가 작성된 시간과 날짜가 표시되어야하며 각 노트 제목은 DB. 그래서 나는 그것을 위해 사용자 정의 어댑터를 만들어 :ListView 용 사용자 지정 어댑터
...
NoteAdapter adapter;
NotesManager manager;
private Note nNoteToDelete;
ArrayList<Note> lstAllNotes;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Setting onClickListener for the "Add note" button when the activity starts
findViewById(R.id.btnAddNewNote).setOnClickListener(addNewNote);
// INSTANTIATING
// Manager - to manage all the DB manipulations
manager = new NotesManager(this);
// Retrieving all the notes in the DB
lstAllNotes = manager.getAllNotes();
// Setting the ArrayAdapter, to display retrieved data in the ListView
//adapter = new ArrayAdapter<Note>(this, R.layout.note, lstAllNotes);
adapter = new NoteAdapter(this, R.layout.main, R.id.noteTitle, lstAllNotes);
// Setting the ListAdapter
setListAdapter(adapter);
// Registering for a single click action for each item in the ListView
getListView().setOnItemClickListener(editNote);
// Registering for a long click, which will pop up a context menu
registerForContextMenu(getListView());
}
...
을하지만 응용 프로그램을 테스트 할 때, 즉시 충돌 :
public class NoteAdapter extends ArrayAdapter<Note> {
public NoteAdapter(Context context, int resource, int textViewResourceId, List<Note> objects) {
super(context, resource, textViewResourceId, objects);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// Creating the row
View row = super.getView(position, convertView, parent);
// Changing the text of time and date
((TextView)row.findViewById(R.id.noteTitle)).setText(getItem(position).getTitle());
((TextView)row.findViewById(R.id.noteTime)).setText(getItem(position).getTime());
((TextView)row.findViewById(R.id.noteDate)).setText(getItem(position).getDate());
((TextView)row.findViewById(R.id.noteTitle)).setTextColor(Color.parseColor(getItem(position).getColor()));
// Returning the row
return row;
}
}
그리고 주요 활동이 내가 그것을 구현하는 방법이다
. LogCat에서 이러한 오류가 발생합니다.08-08 08:59:52.291: E/AndroidRuntime(21268): FATAL EXCEPTION: main
08-08 08:59:52.291: E/AndroidRuntime(21268): java.lang.NullPointerException
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:394)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362)
08-08 08:59:52.291: E/AndroidRuntime(21268): at com.notepad.NoteAdapter.getView(NoteAdapter.java:24)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.widget.AbsListView.obtainView(AbsListView.java:2267)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.widget.ListView.measureHeightOfChildren(ListView.java:1244)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.widget.ListView.onMeasure(ListView.java:1156)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.view.View.measure(View.java:15172)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.widget.LinearLayout.measureVertical(LinearLayout.java:681)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.view.View.measure(View.java:15172)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.view.View.measure(View.java:15172)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.widget.LinearLayout.measureVertical(LinearLayout.java:833)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.view.View.measure(View.java:15172)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
08-08 08:59:52.291: E/AndroidRuntime(21268): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2148)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.view.View.measure(View.java:15172)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1848)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1100)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1273)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:998)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4212)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.view.Choreographer.doCallbacks(Choreographer.java:555)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.view.Choreographer.doFrame(Choreographer.java:525)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.os.Handler.handleCallback(Handler.java:615)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.os.Handler.dispatchMessage(Handler.java:92)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.os.Looper.loop(Looper.java:137)
08-08 08:59:52.291: E/AndroidRuntime(21268): at android.app.ActivityThread.main(ActivityThread.java:4745)
08-08 08:59:52.291: E/AndroidRuntime(21268): at java.lang.reflect.Method.invokeNative(Native Method)
08-08 08:59:52.291: E/AndroidRuntime(21268): at java.lang.reflect.Method.invoke(Method.java:511)
08-08 08:59:52.291: E/AndroidRuntime(21268): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
08-08 08:59:52.291: E/AndroidRuntime(21268): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
08-08 08:59:52.291: E/AndroidRuntime(21268): at dalvik.system.NativeStart.main(Native Method)
무엇이 여기에 있습니까? 왜 계속 충돌을 일으키고 어떻게 수정합니까?
라인 (24)에 NoteAdapter에 무엇입니까? –
ViewHolder 사용 (이 예제 참조) (http://samir-mangroliya.blogspot.in/p/android-customized-listview.html) –
@iulia이 부분은 다음과 같습니다. View row = super.getView (position, convertView, 부모); ' – Igal