Question

我正在查看一家餐馆的列表视图，当我按一个项目时，我会进行另一项活动，其中有关于餐馆的详细信息，并且可以通过单击“保存”按钮将该餐馆存储为我的最爱。

我在我的KafDetails活动中使用“共享”偏好设置，以便始终在保存Restaturant时进行存储。然后在FavKafActivity中读取数据并从菜单图标显示收藏夹的列表视图。

问题是我的收藏夹列表视图仅存储了一个保存的餐厅。当我要保存另一个时，它永远不会显示在我的收藏夹列表视图中，只有第一个。

我在android方面并不陌生，不知道我在哪里做错了？如何读取为FavKaf保存的所有项目？（每当单击了保存该特定项目的按钮时）谢谢

KafDetails.java

final Button save = (Button) findViewById(R.id.save);
save.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
    save.setBackgroundDrawable(getResources().getDrawable(R.drawable.ic_zamenasave));

//    kafani.get(pozicija).setState(true);

    Integer favidk = idk;
    String favimek = imek;
    String favadresa = adresa;
    String favtelbroj = telbroj;
    String favemail = email;
    String favwebstrana = webstrana;
    String favslika = String.valueOf(0);
    Double favlon = 0.0;
    Double favlat = 0.0;

    if (favkafani == null) {
      favkafani = new ArrayList<>();
      favkafani.add(new FavKaf(favidk, favimek, favadresa, favtelbroj, favemail, favwebstrana, favslika, favlon, favlat));
    }
    else {
      favkafani.add(new FavKaf(favidk, favimek, favadresa, favtelbroj, favemail, favwebstrana, favslika, favlon, favlat));
    } 
     SharedPreferences sharedPreferences = getSharedPreferences("shared preferences", MODE_PRIVATE);
      SharedPreferences.Editor editor = sharedPreferences.edit();
      Gson gson = new Gson();
      String json = gson.toJson(favkafani);
      editor.putString("task list", json);
      editor.apply();

  }
});

FavKafActivity.java

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.favkafani);

SharedPreferences sharedPreferences = getSharedPreferences("shared preferences", MODE_PRIVATE);
Gson gson = new Gson();
String json = sharedPreferences.getString("task list", null);
Type type = new TypeToken<ArrayList<FavKaf>>() {}.getType();
favkafani = gson.fromJson(json, type);


editText = (EditText) findViewById(R.id.search);

listViewFav = (ListView) findViewById(R.id.flist);


adapter3 = new CustomAdapter3(favkafani, getApplicationContext());

listViewFav.setAdapter(adapter3);

listViewFav.setOnItemClickListener(new AdapterView.OnItemClickListener() {
  @Override...

和我的CustomAdapter3.java

public class CustomAdapter3 extends ArrayAdapter<FavKaf> implements 
View.OnClickListener{

 private ArrayList<FavKaf> favkafani;
 Context mContext;

 // View lookup cache
 private static class ViewHolder
 {
 TextView imek;
 TextView adresa;
 ImageView image;
 }

public CustomAdapter3(ArrayList<FavKaf> items, Context context) {
  super(context, android.R.layout.activity_list_item, items);
  this.favkafani = items;
  this.mContext=context;
 }

 @Override
 public void onClick(View v) {

   int position=(Integer) v.getTag();
   Object object= getItem(position);
   FavKaf favkafana = (FavKaf) object;


 private int lastPosition = -1;



@Override
public View getView(int position, View convertView, ViewGroup parent) {
  // Get the data item for this position
  FavKaf favkafana = getItem(position);
  // Check if an existing view is being reused, otherwise inflate the view
  ViewHolder viewHolder; // view lookup cache stored in tag


  final View result;

  if (convertView == null) {

  viewHolder = new ViewHolder();
  LayoutInflater inflater = LayoutInflater.from(getContext());
  convertView = inflater.inflate(R.layout.list_item, parent, false);
  viewHolder.imek = (TextView) convertView.findViewById(R.id.ime);
  viewHolder.adresa = (TextView) convertView.findViewById(R.id.avtor);
  viewHolder.image = (ImageView) convertView.findViewById(R.id.listview_image);

  result=convertView;

  convertView.setTag(viewHolder);
} else {
  viewHolder = (ViewHolder) convertView.getTag();
  result=convertView;
}

//Animation animation = AnimationUtils.loadAnimation(mContext, (position > lastPosition) ? R.anim.up_from_bottom : R.anim.down_from_top);
//result.startAnimation(animation);
lastPosition = position;

viewHolder.imek.setText(favkafana.getImek());
viewHolder.adresa.setText(favkafana.getAdresa());
//viewHolder.info.setOnClickListener(this);
//viewHolder.info.setTag(position);
// Return the completed view to render on screen
return convertView;
  }

}

具有共享首选项的收藏夹列表视图仅显示列表中的一个

0 个答案: