Question

我有自定义警报dailog列表并检查我是否尝试在pref中存储所选复选框，如何在共享首选项中存储所选项目，我可以从列表中选择值？任何人都可以帮助我吗？

      class LoadAlldata extends AsyncTask<String, String, ArrayList<HashMap<String, String>>> {

        ArrayAdapter<String> adapterallstates;
        private ProgressDialog pDialog;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(TestCountry.this);
            pDialog.setMessage("Please..");
            pDialog.setIndeterminate(true);
            // pDialog.setIndeterminateDrawable(getResources().getDrawable(R.drawable.custom_progress));
            pDialog.setCancelable(true);
            pDialog.show();

        }

        protected ArrayList<HashMap<String, String>> doInBackground(String... args) {
            ServiceHandler sh = new ServiceHandler();

            // Making a request to url and getting response
            statedata = new ArrayList<HashMap<String, String>>();
            String jsonStr = sh.makeServiceCall(STATE_URL, ServiceHandler.GET);

            Log.d("Response: ", "> " + jsonStr);

            if (jsonStr != null) {
                try {
                    jsonObj = new JSONArray(jsonStr);
                    //  state_list = jsonObj.getJSONArray(COUNTRY_LIST);

                    // looping through All Contacts
                    for (int i = 0; i < jsonObj.length(); i++) {
                        JSONObject c = jsonObj.getJSONObject(i);

                        // creating new HashMap
                        HashMap<String, String> map = new HashMap<String, String>();
                        map.put(STATE_ID, c.getString(STATE_ID));
                        map.put(STATE_NAME, c.getString(STATE_NAME));
                        statedata.add(map);

                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            } else {
                Log.e("ServiceHandler", "Couldn't get any data from the url");
            }

            return statedata;
        }

        protected void onPostExecute(ArrayList<HashMap<String, String>> result) {

            super.onPostExecute(result);
            pDialog.dismiss();

            final String[] arrallstates = new String[statedata.size()];
            checked_state=new boolean[statedata.size()];
            for (int index = 0; index < statedata.size(); index++) {
                HashMap<String, String> map = statedata.get(index);
                arrallstates[index] = map.get(STATE_NAME);
            }

            txtvw.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View w) {



                     new AlertDialog.Builder(TestCountry.this)

                            .setTitle("Choose a Days")

                            .setMultiChoiceItems(arrallstates, null, new DialogInterface.OnMultiChoiceClickListener() {

                                @Override
                                public void onClick(DialogInterface dialog, int which, boolean isChecked) {
// TODO Auto-generated method stub

//storing the checked state of the items in an array
                                    checked_state[which] = isChecked;
                                }
                            })
                            .setPositiveButton("OK", new DialogInterface.OnClickListener() {

                                @Override
                                public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
                                    String display_checked_days = "";
                                    for (int i = 0; i < arrallstates.length; i++) {
                                        if (checked_state[i] == true) {
                                            display_checked_days = display_checked_days + " " + arrallstates[i];
                                        }
                                    }
                                    Toast.makeText(TestCountry.this, "The selected  is" + display_checked_days, Toast.LENGTH_SHORT).show();

//clears the array used to store checked state
                                    for (int i = 0; i < checked_state.length; i++) {
                                        if (checked_state[i] == true) {
                                            checked_state[i] = false;
                                        }
                                    }
//used to dismiss the dialog upon user selection.
                                    dialog.dismiss();
                                }
                            }).create().show();;
                }
            });

        }
    }

Answer 1

首先在Adapter中手动编写setSelection方法。

private int selectedItem = -1;

public void setSelectedItem(int position) {
        selectedItem = position;
        notifyDataSetChanged();
    } // Here selectedItem is global variable

在onBindViewHolder中添加以下代码：

if (position == selectedItem){
 viewHolder.chkSelected.setChecked(stList.get(position));
 viewHolder.chkSelected.setTag(stList.get(position));
} else {
 viewHolder.chkSelected.setChecked(stList.get(position).isselected());
 viewHolder.chkSelected.setTag(stList.get(position));
}

从您的Activity中，您必须从适配器insance调用setSelectedItem（position）。为了获得位置，您已经知道了chekbox Id，因此您可以从列表中获取该Id的位置。

从列表中获取位置：

private int getSelectedItem(List<String> stList, String name) {
  int pos = -1;
  for(int i=0; i<stList.size(); i++) {
   if(name.equals(stList.get(i)){
    pos = i;
    break;
   }
  }
 return pos;
}

Answer 2

试试这样：

首先使用getter setter创建模型类：

 private boolean checked;
public boolean isChecked() {
    return checked;
}

public void setChecked(boolean checked) {
    this.checked = checked;
}

在getview的Adapter Class中写这样的代码。

FilterModelClass model=stList.get(position);
viewHolder.chkbox.setOnCheckedChangeListener(new CheckUpdateListener(model));

使类如下所示处理checkedChangedListener

  /*******************
 * Checkbox Checked Change Listener
 ********************/

private final class CheckUpdateListener implements CompoundButton.OnCheckedChangeListener {
    private final FilterModelClass model;

    private CheckUpdateListener(FilterModelClass model) {
        this.model = model;


    }


    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        Log.i("onCheckedChanged", "isChecked: " + isChecked);
        model.setChecked(isChecked);


        notifyDataSetChanged();




    }
}

如何在pref中存储选定的项目

2 个答案: