我想要在CustomListAdapter中设置的备注存在,直到用户删除它们。无论用户关闭应用程序,手机重新启动还是其他任何内容,他们添加的备注都需要保留在那里直到删除。我试图通过获取我的选项卡中的Sharepreferences并将它们设置在CustomListAdapter中,但它们不会保存:CustomListAdapater SharedPreferences在关闭应用程序时不保存状态
我添加了一个计数器,所以我可以在稍后检索该值以删除并调用方法在customerListAdapter中添加注释以设置SharedPreferences。
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
final View v = inflater.inflate(R.layout.tab3, container, false);
final EditText notes = (EditText) v.findViewById(R.id.editText);
listView=(ListView)v.findViewById(R.id.list);
final int cross = R.drawable.cross;
notesofrules = new ArrayList<String>(); //initial data list
pref = getContext().getSharedPreferences("MyPref", MODE_PRIVATE);
editor = pref.edit();
adapter = new CustomListAdapter(getActivity(), notesofrules, cross);
listView=(ListView) v.findViewById(R.id.list);
listView.setAdapter(adapter); //set the adapter once, only manipulate the data within
Button button = (Button)v.findViewById(R.id.button3);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v)
{
String newNote = notes.getText().toString();
adapter.addNote(newNote, counter, editor); //add new note to the adapter list
counter++;
adapter.notifyDataSetChanged(); //very important to notify adapter and refresh the listview
notes.setText("");
}
});
return v;
}
CustomListAdapter:
public class CustomListAdapter extends ArrayAdapter<String> {
private final Activity context;
private ArrayList<String> notes = new ArrayList<>();
private ImageView image;
private int imageCross; //make this a list if you have multiple images and add similar to notes list
public CustomListAdapter(Activity context, ArrayList<String> notes, int imageCross) {
super(context, R.layout.item,notes);
// TODO Auto-generated constructor stub
this.context=context;
this.notes = notes;
this.imageCross = imageCross;
}
public View getView(final int position, View view, ViewGroup parent) {
LayoutInflater inflater = context.getLayoutInflater();
final View rowView = inflater.inflate(R.layout.item, null, false);
final TextView ruleNotesSet = (TextView) rowView.findViewById(R.id.textView1);
image = (ImageView) rowView.findViewById(R.id.icon);
image.setImageResource(imageCross);
image.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View v){
notes.remove(position);
notifyDataSetChanged();
}
});
ruleNotesSet.setText(notes.get(position));
return rowView;
}
public void addNote(String data, int position, SharedPreferences.Editor editor) {
editor.putString(Integer.toString(position), data);
editor.commit();
notes.add(data);
}
}
看不到的地方我已经错了,我该怎么设置它们,然后在的onClick的customListAdapter内删除它们?
编辑:
我已经内选项卡中添加此:
adapter.getNotes(pref);
listView.setAdapter(adapter);
,这是在CustomListAdapter的getNotes方法:
public void getNotes(SharedPreferences pref)
{
for(String note : notes) {
pref.getString(note, note);
}
}
还没设置状态回来一次关闭。
我还编辑了addNote方法:
editor.putString(data, data);
我可能错过了它,因为在您的问题中有很多代码,但我无法看到您在何处检索您的sharedpreference值。 – Kunu
是的,只是意识到,我在customerAdapter中创建了一个getNotes,并通过它传递了首选项。如果它不起作用,只会尝试更新。 – Sam
@Kunu我已经添加了一个新的方法来检索Sharepreferences,但仍然不工作 – Sam