Question

我的应用程序的ListView包含照片，文本字段和CheckBox。我想保存CheckBox的状态。我通过setOnCheckedChangeListener()分配CheckBox来执行此操作。当我点击复选框时，一切正常，我在保存在日志中后阅读了属性。

当我打开应用程序并选择一个或多个复选框并点击“后退”按钮退出时，会出现问题。当我打开应用程序时，复选框是错误的，如果我关闭并再次打开。要保存，我有一个唯一的变量ID。

你能帮忙吗？

ItemListBaseAdapter：

public class ItemListBaseAdapter extends BaseAdapter {

    private static ArrayList<ItemDetails> itemDetailsrrayList;

    private Integer[] imgid = { R.drawable.img1, R.drawable.img2, R.drawable.img3, R.drawable.img4, R.drawable.img5,
            R.drawable.img6 };

    private LayoutInflater l_Inflater;
    private Context _context;

    private SharedPreferences _apref;
    private Editor _editor;
    private String _NOMBREPREF = "perroo";
    private String _CADINICIO = "gatoo";

    public ItemListBaseAdapter(Context context, ArrayList<ItemDetails> results) {
        _context = context;
        itemDetailsrrayList = results;
        l_Inflater = LayoutInflater.from(context);

        _apref = _context.getSharedPreferences(_NOMBREPREF, Context.MODE_PRIVATE);
        _editor = _apref.edit();
    }

    public int getCount() {
        return itemDetailsrrayList.size();
    }

    public Object getItem(int position) {
        return itemDetailsrrayList.get(position);
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(final int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null) {
            convertView = l_Inflater.inflate(R.layout.item_details_view, null);
            holder = new ViewHolder();
            holder.txt_itemName = (TextView) convertView.findViewById(R.id.name);
            holder.txt_itemDescription = (TextView) convertView.findViewById(R.id.itemDescription);
            holder.txt_itemPrice = (TextView) convertView.findViewById(R.id.price);
            holder.itemImage = (ImageView) convertView.findViewById(R.id.photo);
            holder.ckb_degustado = (CheckBox) convertView.findViewById(R.id.checkBox1);

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

        holder.txt_itemName.setText(itemDetailsrrayList.get(position).getName());

        holder.txt_itemDescription.setText(itemDetailsrrayList.get(position).getItemDescription());
        holder.txt_itemPrice.setText(itemDetailsrrayList.get(position).getPrice());

        holder.itemImage.setImageResource(imgid[itemDetailsrrayList.get(position).getImageNumber() - 1]);

        boolean tmprf = readPrefsCheckbox(itemDetailsrrayList.get(position).getIduniko().toString());
        String tmpr2 = Boolean.toString(tmprf);
        holder.ckb_degustado.setChecked(tmprf);
        Log.d("DREKION", "Inicio: " + itemDetailsrrayList.get(position).getIduniko().toString() + " " + tmpr2);

        // Checkbox degustation clickado
        holder.ckb_degustado.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                // TODO Auto-generated method stub
                String cad1;
                boolean cadtmp;
                String cadtmpp;

                if (isChecked == true) {
                    cad1 = _CADINICIO + itemDetailsrrayList.get(position).getIduniko().toString();
                    Log.d("DREKION", "True: " + cad1);
                    _editor.putBoolean(cad1, true);
                    _editor.commit();
                    cadtmp = readPrefsCheckbox(itemDetailsrrayList.get(position).getIduniko().toString());
                    cadtmpp = Boolean.toString(cadtmp);
                    Log.d("DREKION", "True despues: " + cadtmpp);
                } else {
                    cad1 = _CADINICIO + itemDetailsrrayList.get(position).getIduniko().toString();
                    Log.d("DREKION", "False: " + cad1);
                    _editor.putBoolean(cad1, false);
                    _editor.commit();
                    cadtmp = readPrefsCheckbox(itemDetailsrrayList.get(position).getIduniko().toString());
                    cadtmpp = Boolean.toString(cadtmp);
                    Log.d("DREKION", "False despues: " + cadtmpp);
                }
            }
        });

        convertView.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // do something here
                // for communication with Fragment/Activity, you can use your
                // own listener
                /*
                 * Toast.makeText(v.getContext(), "Has elegido : " +
                 * itemDetailsrrayList.get(position).getItemDescription() + "",
                 * Toast.LENGTH_LONG).show(); Intent intent = new
                 * Intent(v.getContext(), ItemMoreInfo.class);
                 * intent.putExtra("objetito",
                 * itemDetailsrrayList.get(position));
                 */
                sendMessage(v, itemDetailsrrayList.get(position));
            }
        });
        return convertView;
    }

    private boolean readPrefsCheckbox(String _iduniko) {

        return _apref.getBoolean(_CADINICIO + _iduniko, false);
    }

    public void sendMessage(View view, ItemDetails objID) {
        Intent intent = new Intent(view.getContext(), ItemMoreInfo.class);
        intent.putExtra("objetito", objID);
        view.getContext().startActivity(intent);
    }

    private void showNotificacion(Context c, String t) {
        Toast.makeText(c, t, Toast.LENGTH_LONG).show();
    }

    static class ViewHolder {

        TextView txt_itemName;
        TextView txt_itemDescription;
        TextView txt_itemPrice;
        ImageView itemImage;
        CheckBox ckb_degustado;
    }
}

MainActivity：

public class MainActivity extends Activity {

    private SharedPreferences pref;
    private Editor editor;

    private String _NOMBREPREF = "perroo";
    private String _CADINICIO = "gatoo";

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

        ArrayList<ItemDetails> image_details = GetSearchResults();

        // Init shares vars
        pref = getApplicationContext().getSharedPreferences(_NOMBREPREF, 0);
        editor = pref.edit();

        final ListView lv1 = (ListView) findViewById(R.id.listV_main);
        lv1.setAdapter(new ItemListBaseAdapter(this, image_details));
        //
        lv1.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> a, View v, int position, long id) {
                /*
                 * 
                 * Object o = lv1.getItemAtPosition(position); ItemDetails
                 * obj_itemDetails = (ItemDetails)o;
                 * Toast.makeText(MainActivity.this, "Has elegido : " + " " +
                 * obj_itemDetails.getName(), Toast.LENGTH_LONG).show();
                 * sendMessage
                 * (findViewById(android.R.id.content),obj_itemDetails);
                 */
            }
        });
    }

    private ArrayList<ItemDetails> GetSearchResults() {
        ArrayList<ItemDetails> results = new ArrayList<ItemDetails>();

        ItemDetails item_details = new ItemDetails();
        item_details.setIduniko("tap001");
        item_details.setName("Pizza");
        item_details.setItemDescription("prueba");
        item_details.setPrice("2€");
        item_details.setImageNumber(1);
        results.add(item_details);
    }
}

Answer 1

position方法中onCheckedChanged()的值与循环内position的值不同，因为代码在不同的时间运行...每次循环运行滚动ListView，而当用户单击CheckBox时运行onCheckedChanged()。

一个简单的解决方法是使用setTag()和getTag()来存储该行的字符串循环内部：

holder.ckb_degustado.setTag(itemDetailsrrayList.get(position).getIduniko());

内部onCheckedChanged()：

cad1 = _CADINICIO + ((String) buttonView.getTag());

（还考虑存储对itemDetailsrrayList.get(position)的本地引用，而不是重复调用相同的方法。）

SharedPreferences - 阅读不好但写得好

1 个答案: