java - 访问和编辑自定义适配器的 subview

Question

我有一个由自定义 ArrayAdapter 填充的 ListView。每行的结构由

组成

• ImageView
• TextView
• 数字选择器
• 图片按钮

点击 ImageButton 应该会显示一个弹出窗口，其中包含 color slider和一个“接受”按钮。这是一张应该阐明布局的图像。

我想做的是:通过单击弹出窗口中包含的“接受”按钮，我应该检索选定的颜色，将其设置为 ImageButton 的背景色并关闭弹出窗口。这是代码:

        public View getView(final int position, View convertView, ViewGroup parent) {
                _row_view = convertView;
                db = new SofosDbDAO(this._ctx);
                if(_row_view==null){
                    // 1. Create inflater
                    _inflater = (LayoutInflater) _ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                    _row_view =  _inflater.inflate(R.layout.riga_app,parent,false);
                }

                // 2. Inflate xml layout
                _row_view = _inflater.inflate(R.layout.riga_app, parent, false);

                // 3. Initialize child views
                _iconaapp = (ImageView)_row_view.findViewById(R.id.riga_app_iv);
                _nomeapp = (TextView)_row_view.findViewById(R.id.riga_app_tv);
                _numerovibrazioni = (NumberPicker)_row_view.findViewById(R.id.riga_app_np);
                _colorenotifica = (ImageButton)_row_view.findViewById(R.id.riga_app_ib);

                // 4. Set Values
                int iconid = _ctx.getResources().getIdentifier(_sofosapps.get(position).get_app_icon(), "drawable", _ctx.getPackageName());
                Drawable icon = _ctx.getResources().getDrawable(iconid);
                _iconaapp.setImageDrawable(icon);
                String appname = _sofosapps.get(position).get_app_name();
                _nomeapp.setText(appname);
                _numerovibrazioni.setMinValue(0);
                _numerovibrazioni.setMaxValue(5);
                _numerovibrazioni.setValue(_sofosapps.get(position).get_vibrations());

    //Update DB when number picker value gets changed
                _numerovibrazioni.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {
                    @Override
                    public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
                        SofosApp app = _sofosapps.get(position);
                        app.set_vibrations(newVal);
                        db.openDb();
                        db.updateAppVibrations(app);
                        db.closeDb();
                        Log.d("DEBUG", "Updated nr of vibrations");
                    }
                });

                //Set initial ImageButton background color
    _colorenotifica.setBackgroundColor(_sofosapps.get(position).get_color());

    //Show popup window on click of ImageButton
                _colorenotifica.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        _popupcontainer = (ViewGroup)_inflater.inflate(R.layout.color_picker_popup,null);
                        _puw = new PopupWindow(_popupcontainer,800,600,true);//view,dimensioni e focusable
                        _btn_applica = (Button) _popupcontainer.findViewById(R.id.color_picker_btn_applica);
                        _tv_applica_colore = (TextView) _popupcontainer.findViewById(R.id.color_picker_tv);
                        _tv_applica_colore.setText(_sofosapps.get(position).get_app_name());
                        _lss = (LobsterShadeSlider)_popupcontainer.findViewById(R.id.color_picker_ls);
                        _puw.showAtLocation(_popupcontainer, Gravity.CENTER, 20, 50);
                        Log.d("DEBUG","I clicked on imagebutton and opened my popupwindow");
                    }
                });

//**********************************************************
*********************** CRUCIAL POINT **********************
************************************************************
//Click of accept button inside popupwindow
                _btn_applica.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        newcolor = _lss.getColor();
                        String dbg = "color = " + String.valueOf(newcolor);
                        Log.d("DEBUG", dbg);
                        _colorenotifica.setBackgroundColor(newcolor);
                        _puw.dismiss();
                        _colorenotifica.invalidate();
                        Log.d("DEBUG", "Cliked accept");
                    }
                });
                // 5. retrn rowView
                return _row_view;
            }

我意识到这种方法是不正确的，因为 imagebutton 的背景图像不会改变。此外，出于某种原因，我无法为每一行创建一个新的弹出窗口:当我单击任何图像按钮时，会出现相同的弹出窗口，其中 textview 文本设置为最后一行“Twitter”。这样做的正确方法是什么？感谢您的帮助!

Answer 1

您应该更改数组 _sofosapps 中的颜色值，然后在适配器上调用 notifydatasetchanged。

_colorenotifica.setTag(position);
 _colorenotifica.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                     int position = (int)v.getTag();
                    _popupcontainer = (ViewGroup)_inflater.inflate(R.layout.color_picker_popup,null);
                    _puw = new PopupWindow(_popupcontainer,800,600,true);//view,dimensioni e focusable
                    _btn_applica = (Button) _popupcontainer.findViewById(R.id.color_picker_btn_applica);
                    _tv_applica_colore = (TextView) _popupcontainer.findViewById(R.id.color_picker_tv);
                    _tv_applica_colore.setText(_sofosapps.get(position).get_app_name());
                    _lss = (LobsterShadeSlider)_popupcontainer.findViewById(R.id.color_picker_ls);
                    _puw.showAtLocation(_popupcontainer, Gravity.CENTER, 20, 50);
                    _btn_applica.setTag(position);
                    Log.d("DEBUG","I clicked on imagebutton and opened my popupwindow");
                }
            });
 _btn_applica.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    newcolor = _lss.getColor();
                    String dbg = "color = " + String.valueOf(newcolor);
                    Log.d("DEBUG", dbg);
                    int position = (int)v.getTag();
                    _sofosapps.get(position).setColor(dbg);
                    notifyDataSetChanged();
                    _puw.dismiss();
                }
            });