您好，我正在尝试学习Android开发，并且正在构建一个新的应用程序。我已经实现了ListFragment和适配器以显示一些注释。这些注释会按我的意愿显示，但是现在当我单击某个项目时，我无法触发其他活动，并且在日志中看到了上面的错误。我的代码如下所示。
这是主要片段
public class MainListFragment extends ListFragment {
private ArrayList<NoteStructure> notes;
private NoteAdapter noteAdapter;
public MainListFragment() {
// Required empty public constructor
}
public void onActivityCreated(Bundle savedInstanceState){
super.onActivityCreated(savedInstanceState);
notes = new ArrayList<NoteStructure>();
notes.add(new NoteStructure("malakia", "sdfsfsdfffffffsdfsfsfdfsfsds"));
notes.add(new NoteStructure("sou gamw", "gamithikessssssssssssssssssssssssssssssssss"));
noteAdapter = new NoteAdapter(getActivity(),notes);
setListAdapter(noteAdapter);
}
public void onListItemClick(ListView listView, View view, int position, long id){
super.onListItemClick(listView,view,position,id);
Log.e("Item" ,"click"+ position);
procceedToOtherActivity(position);
}
private void procceedToOtherActivity (int position){
NoteStructure note = (NoteStructure) getListAdapter().getItem(position);
Intent intent = new Intent(getActivity().getApplicationContext(),DetailActivity.class);
intent.putExtra(MainActivity.NOTEID,note.getNoteId() );
intent.putExtra(MainActivity.NOTETITLE,note.getTitle());
intent.putExtra(MainActivity.NOTESUMMARY,note.getSummary());
startActivity(intent);
}
}
这是Note适配器：
public class NoteAdapter extends ArrayAdapter<NoteStructure> {
public static class ViewRef {
TextView noteTitle;
TextView noteSummary;
}
public NoteAdapter(Context context, ArrayList<NoteStructure> notes){
super(context,0,notes);
}
public View getView(int position, View convertView, ViewGroup parent){
NoteStructure note = getItem(position);
ViewRef viewRef;
if(convertView==null) {
viewRef = new ViewRef();
convertView = LayoutInflater.from(getContext()).inflate(R.layout.custom_list_row,parent,false);
viewRef.noteTitle=(TextView)convertView.findViewById(R.id.noteTitle);
viewRef.noteSummary=(TextView)convertView.findViewById(R.id.noteSummary);
convertView.setTag(viewRef);
}
else {
viewRef = (ViewRef) convertView.getTag();
}
viewRef.noteTitle.setText(note.getTitle());
viewRef.noteSummary.setText(note.getSummary());
return convertView;
}
}
我还有一个NoteStructure类，该类仅包含id，title和summary变量以及getter和setter，并且mainActivity和DetailActivity现在什么都不做。我进行了很多搜索，但无法弄清楚为什么DetaiLActivity无法启动的问题。有人可以帮帮我吗？
这是我与一个临时侦听器的实现
public class MainListFragment extends Fragment {
private View view;
private ListView list;
private ArrayList<NoteStructure> notes;
private NoteAdapter noteAdapter;
public MainListFragment() {
// Required empty public constructor
}
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
view = inflater.inflate(R.layout.main_fragment_layout, container, false);
list= (ListView) view.findViewById(R.id.listView);
notes = new ArrayList<NoteStructure>();
notes.add(new NoteStructure("malakia", "sdfsfsdfffffffsdfsfsfdfsfsds"));
notes.add(new NoteStructure("sou gamw", "gamithikessssssssssssssssssssssssssssssssss"));
noteAdapter = new NoteAdapter(getActivity(),notes);
list.setAdapter(noteAdapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
procceedToOtherActivity(position);
}
});
return view;
}
private void procceedToOtherActivity (int position){
NoteStructure note = (NoteStructure) list.getAdapter().getItem(position);
Intent intent = new Intent(getActivity().getApplicationContext(),DetailActivity.class);
intent.putExtra(MainActivity.NOTEID,note.getNoteId() );
intent.putExtra(MainActivity.NOTETITLE,note.getTitle());
intent.putExtra(MainActivity.NOTESUMMARY,note.getSummary());
startActivity(intent);
}
}
最佳答案
您的itemClickListener无法启动。您应该像这样重写监听器：
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
// TODO implement some logic
}
或者您应该扩展正常片段
public class MainListFragment extends Fragment{
并为listview设置临时的简单侦听器：
listview.setAdapter(noteAdapter);
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
procceedToOtherActivity(position);
}
});