Question

我已经实施了一个小型购物车项目，有一个带按钮的产品列表。当我点击＆＃34; ADD＆＃34;按钮它将改变按钮名称＆＃34; ADD＆＃34;去除＆＃34;删除＆＃34;和颜色也改变绿色到红色。这里我的问题是，如果我重新访问产品表单，点击按钮应该是＆＃34;删除＆＃34;和红色。那么如何将点击的按钮位置添加到会话中。

我的代码：

@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
        @Override
        public View getView(final int position, View convertView, ViewGroup arg2) {
            final ViewHolderGrid holderForGrid;
            if (convertView == null) {
                convertView = getLayoutInflater().inflate(R.layout.consumer_catalog_list_item, null);
                holderForGrid = new ViewHolderGrid(convertView);
                convertView.setTag(holderForGrid);

            } else {
                holderForGrid = (ViewHolderGrid) convertView.getTag();
            }

            final BusinessCatalogVariables Catalog = catalogList.get(position);




            holderForGrid.AddtoCart.setClickable(false);
            holderForGrid.AddtoCart.setTag(position);

            if (catalogList.get(position).isAdded()) {
                holderForGrid.AddtoCart.setText("Remove");
                holderForGrid.AddtoCart.setBackgroundResource(R.drawable.btnred);
            } else {
                holderForGrid.AddtoCart.setText("Add to Cart");
                holderForGrid.AddtoCart.setBackgroundResource(R.drawable.buttonsignup);
            }

            if (Pref_Storage.checkDetail(context, Items)) {
                holderForGrid.AddtoCart.setText("Remove");
                holderForGrid.AddtoCart.setBackgroundResource(R.drawable.btnred);
                Toast.makeText(context, Items, Toast.LENGTH_SHORT).show();
            } else {
                holderForGrid.AddtoCart.setText("Add to Cart");
                holderForGrid.AddtoCart.setBackgroundResource(R.drawable.buttonsignup);
            }

            holderForGrid.AddtoCart.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {

                    Position = (Integer) v.getTag();

                    Log.d("ADD BUTTON POSITION:", "position=" + position);

                    if (holderForGrid.AddtoCart.getText().equals("Add to Cart")) {

                        catalogList.get(position).setAdded(true);
                        holderForGrid.AddtoCart.setText("Remove");
                        holderForGrid.AddtoCart.setBackgroundResource(R.drawable.btnred);


                        Items = String.valueOf(Position);
                        Pref_Storage.setDetail(context, Items, "added");

//                      

                    } else if (holderForGrid.AddtoCart.getText().equals("Remove")) {

                        catalogList.get(position).setAdded(false);
                        holderForGrid.AddtoCart.setBackgroundResource(R.drawable.buttonsignup);
                        holderForGrid.AddtoCart.setText("Add to Cart");


                        Items = String.valueOf(Position);
                        Pref_Storage.deleteKey(context,Items);


                    }


                }
            });

            return convertView;
        }

Answer 1

你必须使用setTag（），getTag（）方法，

Class Pref_Storage.java [用于存储产品ID]

public class Pref_Storage {
    private static SharedPreferences sharedPreferences = null;

    public static void openPref(Context context) {
        sharedPreferences = context.getSharedPreferences(context.getResources().getString(R.string.app_name),
                Context.MODE_PRIVATE);
    }

    public static void deleteKey(Context context, String key) {
        HashMap<String, String> result = new HashMap<String, String>();

        Pref_Storage.openPref(context);
        for (Entry<String, ?> entry : Pref_Storage.sharedPreferences.getAll()
                .entrySet()) {
            result.put(entry.getKey(), (String) entry.getValue());
        }

        boolean b = result.containsKey(key);
        if (b) {
            Pref_Storage.openPref(context);
            Editor prefsPrivateEditor = Pref_Storage.sharedPreferences.edit();
            prefsPrivateEditor.remove(key);

            prefsPrivateEditor.commit();
            prefsPrivateEditor = null;
            Pref_Storage.sharedPreferences = null;
        }
    }

    public static void setDetail(Context context, String key, String value) {
        Pref_Storage.openPref(context);
        Editor prefsPrivateEditor = Pref_Storage.sharedPreferences.edit();
        prefsPrivateEditor.putString(key, value);

        prefsPrivateEditor.commit();
        prefsPrivateEditor = null;
        Pref_Storage.sharedPreferences = null;
    }

    public static Boolean checkDetail(Context context, String key) {
        HashMap<String, String> result = new HashMap<String, String>();

        Pref_Storage.openPref(context);
        for (Entry<String, ?> entry : Pref_Storage.sharedPreferences.getAll()
                .entrySet()) {
            result.put(entry.getKey(), (String) entry.getValue());
        }

        boolean b = result.containsKey(key);
        return b;
    }
}

在Adapter Class中你必须检查：

    if(Pref_Storage.checkDetail(context, pid)){
        holderForGrid.AddtoCart.setText("Remove");
    }
    else{
        holderForGrid.AddtoCart.setText("Add to Cart");
    }

    holderForGrid.AddtoCart.setTag(position);
    holderForGrid.AddtoCart.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

            int pos = (int) v.getTag();
            Button btn=(Button)v;

            if (btn.getText().equals("Add to Cart")) {
                catalogList.get(position).setAdded(true);
                btn.setText("Remove");
                btn.setBackgroundResource(R.drawable.btnred);
                Pref_Storage.setDetail(context, pid, "added");
            } else if (btn.getText().equals("Remove")) {

                catalogList.get(position).setAdded(false);
                btn.setBackgroundResource(R.drawable.buttonsignup);
                btn.setText("Add to Cart");
                Pref_Storage.deleteKey(context,pid);
            }
        }
    });

Answer 2

试试这个。

        if (catalogList.get(position).isAdded()) {
            holderForGrid.AddtoCart.setText("Remove");
            holderForGrid.AddtoCart.setBackgroundResource(R.drawable.btnred);
        } else {
            holderForGrid.AddtoCart.setText("Add to Cart");
            holderForGrid.AddtoCart.setBackgroundResource(R.drawable.buttonsignup);
        }

如何将单击的按钮位置添加到会话

2 个答案: