访问和编辑自定义适配器的子视图

Question

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

组成

ImageView
文本视图
数字选择器
图片按钮

单击 ImageButton 应该会显示一个弹出窗口 window，其中包含一个 color slider 和一个 "ACCEPT" 按钮。这是一张应该阐明布局的图像。

我想做的是：通过单击包含在弹出窗口 window 中的 "ACCEPT" 按钮，我应该检索选定的颜色，将其设置为 ImageButton 的背景颜色并关闭弹出window。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 window：当我单击任何图像按钮时，会出现相同的弹出窗口 window，其中文本视图文本设置为 "Twitter" , 最后一行。这样做的正确方法是什么？感谢您的帮助！

Answer 1

在 _colorenotifica 的 onClick 事件上调用自定义对话框并监听它的按钮单击事件，然后根据位置获取适当的项目对象并应用更改...

.
.
_colorenotifica.setOnClickListener(new View.OnClickListener() {
     int mPosition = position;

     @Override
     public void onClick(View v) {
         /**
          * invoke custom dialog, add button.. 
          */
          dlg.setButton(AlertDialog.BUTTON_POSITIVE, "Accept", new DialogInterface.OnClickListener() {
               @Override
               public void onClick(DialogInterface dialogInterface, int i) {
                   getItem(mPosition); // apply changes to the item at position `mPosition`
               }
          });
     }
 });
.
.

Answer 2

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();
                }
            });

访问和编辑自定义适配器的子视图

Access and edit child view of custom adapter

java

android

android-layout

custom-adapter