我想要在CustomListAdapter中設置的備註存在,直到用戶刪除它們。無論用戶關閉應用程序,手機重新啓動還是其他任何內容,他們添加的備註都需要保留在那裏直到刪除。我試圖通過獲取我的選項卡中的Sharepreferences並將它們設置在CustomListAdapter中,但它們不會保存:CustomListAdapater SharedPreferences在關閉應用程序時不保存狀態
我添加了一個計數器,所以我可以在稍後檢索該值以刪除並調用方法在customerListAdapter中添加註釋以設置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);
}
}
看不到的地方我已經錯了,我該怎麼設置它們,然後在的onClick的customListAdapter內刪除它們?
編輯:
我已經內選項卡中添加此:
adapter.getNotes(pref);
listView.setAdapter(adapter);
,這是在CustomListAdapter的getNotes方法:
public void getNotes(SharedPreferences pref)
{
for(String note : notes) {
pref.getString(note, note);
}
}
還沒設置狀態回來一次關閉。
我還編輯了addNote方法:
editor.putString(data, data);
我可能錯過了它,因爲在您的問題中有很多代碼,但我無法看到您在何處檢索您的sharedpreference值。 – Kunu
是的,只是意識到,我在customerAdapter中創建了一個getNotes,並通過它傳遞了首選項。如果它不起作用,只會嘗試更新。 – Sam
@Kunu我已經添加了一個新的方法來檢索Sharepreferences,但仍然不工作 – Sam