java从CustomListAdapter内部的SharedReferences中删除值问题
当用户添加注释时,此注释将保存到SharedReferences中。但是,当用户单击图像以删除注释时,该注释将被正确删除,并从SharedReferences中正确删除。但是,当用户关闭应用程序或更改选项卡并返回时,删除的笔记数量会被最后一个笔记替换,因此它会显示所有重复的笔记,以代替删除的笔记。我无法理解这一点,并且感到困惑:/
代码:
import 安卓.app.Activity;
import 安卓.content.SharedPreferences;
import 安卓.preference.PreferenceManager;
import 安卓.util.Log;
import 安卓.view.LayoutInflater;
import 安卓.view.View;
import 安卓.view.ViewGroup;
import 安卓.widget.ArrayAdapter;
import 安卓.widget.Button;
import 安卓.widget.ImageView;
import 安卓.widget.TextView;
import com.bumptech.glide.Glide;
import com.bumptech.glide.load.engine.DiskCacheStrategy;
import java.util.ArrayList;
import java.util.Map;
import static 安卓.content.Context.MODE_PRIVATE;
public class CustomListAdapter extends ArrayAdapter<String> {
private final Activity context;
private ArrayList<String> notes = new ArrayList<>();
private ImageView image;
private int imageCross;
TextView ruleNotesSet;
final SharedPreferences FeedPref= PreferenceManager.getDefaultSharedPreferences(getContext());
final SharedPreferences.Editor fd = FeedPref.edit();
public CustomListAdapter(Activity context, ArrayList<String> notes, int imageCross) {
super(context, R.layout.item,notes);
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);
ruleNotesSet = (TextView) rowView.findViewById(R.id.textView1);
image = (ImageView) rowView.findViewById(R.id.icon);
Glide.with(getContext())
.load(imageCross)
.skipMemoryCache(true)
.diskCacheStrategy(DiskCacheStrategy.NONE)
.into(image);
image.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View v){
notes.remove(position);
fd.remove(Integer.toString(position));
fd.apply();
fd.commit();
notifyDataSetChanged();
}
});
ruleNotesSet.setText(notes.get(position));
fd.putString(Integer.toString(position), notes.get(position));
fd.apply();
fd.commit();
return rowView;
}
public void addNote(String data) {
notes.add(data);
}
}
日志:
10-30 13:22:30.053 2538-2538/org.app.random E/Logs: Adding a note{}
10-30 13:22:35.437 2538-2538/org.app.random E/Logs: Adding a note{0=note1}
10-30 13:22:44.927 2538-2538/org.app.random E/Logs: Adding a note{0=note1}
10-30 13:22:49.422 2538-2538/org.app.random E/Logs: Adding a note{0=note1}
10-30 13:22:51.187 2538-2538/org.app.random E/Logs: Adding a note{0=note1}
10-30 13:22:51.200 2538-2538/org.app.random E/Logs: Adding a note{0=note1}
10-30 13:22:51.211 2538-2538/org.app.random E/Logs: Adding a note{0=note1, 1=note2}
10-30 13:22:51.222 2538-2538/org.app.random E/Logs: Adding a note{0=note1, 1=note2, 2=note3}
10-30 13:23:06.252 2538-2538/org.app.random E/Logs: Change tabs/Close app{0=note1, 1=note2, 2=note3, 3=note4}
10-30 13:23:06.299 2538-2538/org.app.random E/Logs: Adding a note{0=note1, 1=note2, 2=note3, 3=note4}
10-30 13:23:06.319 2538-2538/org.app.random E/Logs: Adding a note{0=note1, 1=note2, 2=note3, 3=note4}
10-30 13:23:26.709 2538-2538/org.app.random E/Logs: Removing a note{0=note1, 2=note3, 3=note4}
10-30 13:23:26.716 2538-2538/org.app.random E/Logs: Adding a note{0=note1, 2=note3, 3=note4}
10-30 13:23:26.721 2538-2538/org.app.random E/Logs: Adding a note{0=note1, 2=note3, 3=note4}
10-30 13:23:26.747 2538-2538/org.app.random E/Logs: Adding a note{0=note1, 1=note3, 2=note3, 3=note4}
10-30 13:23:29.795 2538-2538/org.app.random E/Logs: Removing a note{1=note3, 2=note4, 3=note4}
10-30 13:23:29.799 2538-2538/org.app.random E/Logs: Adding a note{1=note3, 2=note4, 3=note4}
10-30 13:23:29.815 2538-2538/org.app.random E/Logs: Adding a note{0=note3, 1=note3, 2=note4, 3=note4}
10-30 13:23:38.491 2538-2538/org.app.random E/Logs: Change tabs/Close app{0=note3, 1=note4, 2=note4, 3=note4}
10-30 13:23:38.506 2538-2538/org.app.random E/Logs: Adding a note{0=note3, 1=note4, 2=note4, 3=note4}
10-30 13:23:38.521 2538-2538/org.app.random E/Logs: Adding a note{0=note3, 1=note4, 2=note4, 3=note4}
我已经使日志非常具有描述性基本上我添加了4个注释,按back键删除键盘这会填充SharedReferences,我更改选项卡,我返回并删除注释,更改选项卡再次使用删除的内容填充注释4
编辑:
在使用SharedReferences中的内容重新填充视图时,我需要:
Start off with : app{0=note1, 1=note2, 2=note3, 3=note4}
Remove notes1 and note2: {1=note3, 2=note4}
When repopulating the view repopulate with only : {1=note3, 2=note4}
Instead what happens currently: {1=note3, 2=note4, 3=note4, 4=note4}
编辑:
根据下面的答案添加更多日志,因为代码已更改:
10-30 17:12:31.527 12984-12984/org.random.app E/Logs: Notes in addNote{0=note 1}
10-30 17:12:31.554 12984-12984/org.random.app E/Logs: Notes in getView{0=note 1}
10-30 17:12:34.400 12984-12984/org.random.app E/Logs: Notes in addNote{0=note 1, 1=note 2}
10-30 17:12:34.415 12984-12984/org.random.app E/Logs: Notes in getView{0=note 1, 1=note 2}
10-30 17:12:36.525 12984-12984/org.random.app E/Logs: Notes in addNote{0=note 1, 1=note 2, 2=note 3}
10-30 17:12:36.542 12984-12984/org.random.app E/Logs: Notes in getView{0=note 1, 1=note 2, 2=note 3}
10-30 17:12:38.273 12984-12984/org.random.app E/Logs: Notes in getView{0=note 1, 1=note 2, 2=note 3}
10-30 17:12:38.295 12984-12984/org.random.app E/Logs: Notes in getView{0=note 1, 1=note 2, 2=note 3}
10-30 17:12:45.983 12984-12984/org.random.app E/Logs: Removing a note{0=note 1, 2=note 3}
10-30 17:12:45.991 12984-12984/org.random.app E/Logs: Notes in getView{0=note 1, 2=note 3}
10-30 17:12:45.994 12984-12984/org.random.app E/Logs: Notes in getView{0=note 1, 2=note 3}
10-30 17:12:50.951 12984-12984/org.random.app E/Logs: Change tabs/Close app{0=note 1, 2=note 3}
10-30 17:12:50.975 12984-12984/org.random.app E/Logs: Notes in getView{0=note 1, 2=note 3}
10-30 17:12:50.978 12984-12984/org.random.app E/Logs: Notes in getView{0=note 1, 2=note 3}
10-30 17:12:54.390 12984-12984/org.random.app E/Logs: Removing a note{0=note 1, 2=note 3}
10-30 17:12:54.401 12984-12984/org.random.app E/Logs: Notes in getView{0=note 1, 2=note 3}
10-30 17:12:57.466 12984-12984/org.random.app E/Logs: Change tabs/Close app{0=note 1, 2=note 3}
10-30 17:12:57.522 12984-12984/org.random.app E/Logs: Notes in getView{0=note 1, 2=note 3}
10-30 17:12:57.531 12984-12984/org.random.app E/Logs: Notes in getView{0=note 1, 2=note 3}
# 1 楼答案
我可能会发现原因: 在get View中将字符串再次添加回SharedPrefernces,每次调用该字符串时,都会执行以下代码:
就在第行下方:
如您所见,当适配器构建视图以使其可见时,您正在将相同的值添加回SharedReferences,如果您有足够大的列表,则扩展程度将更大,因为向上/向下滚动将向共享首选项添加新值
请将它们注释掉并检查结果
新方法
创建一个类注释,如下所示:
然后将其添加到您的活动中(仅用于测试):
此方法用于从SharedReferences加载笔记
自定义ListAdapter的最后一个选项:
我相信这会在你需要的时候起作用
注意:我将时间戳作为密钥,以确保密钥不会重复,因此,在添加新注释时不会覆盖现有密钥
还请注意,我在每个图像上添加了相应的Note对象作为view标记,以便在用户单击删除它时将其返回,从而获得正确的Note键
请尝试一下,让我知道它是否适合你