如何在 SimpleCursorAdapter 中包含 SeekBar？

Question

我正在使用自定义 SimpleCursorAdapter 在 ListView 中包含 SeekBar。但我似乎无法link 将进度值显示在TextView 中。这是我的示例代码。

class TmpSimpleCursorAdapter extends SimpleCursorAdapter {
        public TmpSimpleCursorAdapter(Context context, int layout, Cursor c, String[] from, int[] to, int flags) {
            super(context, layout, c, from, to, flags);
        }

        @Override
        public View newView(Context _context, Cursor _cursor, ViewGroup parent) {
            LayoutInflater inflater = (LayoutInflater) _context.getSystemService(_context.LAYOUT_INFLATER_SERVICE);
            View view = inflater.inflate(R.layout.row_item_temperature, parent, false);
            return view;
        }

        @Override
        public void bindView(View view, Context Context, final Cursor cursor) {
            //Room name, displaying in ListView Item
            String title = cursor.getString(cursor.getColumnIndex(DBTemperature.COLUMN_TITLE));
            //Set temperature value, adjusting by SeekBar
            temperature = (TextView) view.findViewById(R.id.roomTemperature);
            SeekBar seekBar = (SeekBar) view.findViewById(R.id.seekBar);
            seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
                @Override
                public void onProgressChanged(SeekBar seekBar, int progressValue, boolean fromUser) {
                    temperature.setText("+" + progressValue);
                    Log.d(MEGA, "Progress Changed");
                }

                @Override
                public void onStartTrackingTouch(SeekBar seekBar) {
                    Log.d(MEGA, "Progress Started");
                }

                @Override
                public void onStopTrackingTouch(SeekBar seekBar) {

                    Log.d(MEGA, "Progress Stopped");
                }

            });

        }
    }

日志甚至显示它工作正常，但 SeekBar 的值 未传输 到 TextView。我应该为此使用 ViewBinder 吗？还是我的代码中缺少某些内容？

============================================= =========================

下一阶段 - 使用 ViewBinder 我已经改变了设置ListView Rows的方式，但是SeekBar还是有问题。

public class FragmentTemperatureDB 扩展 Fragment 实现 LoaderCallbacks {

ListView lvTemperature;
DBTemperature dbHelperTmp;
SimpleCursorAdapter dataAdapterTmp;
int LIST_TMP_ID = 0;

ActionMode tmpActionMode;
private int operatePosition = 0;
final static String MEGADOR = "megadr";

public FragmentTemperatureDB() {
    // Required empty public constructor
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View vTemperatures = inflater.inflate(R.layout.fragment_thermal, container, false);
    // Initialize data for ListView
    dbHelperTmp = new DBTemperature(FragmentTemperatureDB.this.getActivity());
    dbHelperTmp.open();
    String[] from = new String[] {  DBTemperature.COLUMN_TITLE,
                                    DBTemperature.COLUMN_CURRENT_TEMP,
                                    DBTemperature.COLUMN_ADJUST_TEMP};
    int[] to = new int[] {  R.id.roomTitleTmp,
                            R.id.roomTemperature,
                            R.id.adjustTemperature};
    // Setup Adapter for ListView
    dataAdapterTmp = new SimpleCursorAdapter(FragmentTemperatureDB.this.getActivity(),
            R.layout.row_item_temperature, null, from, to, LIST_TMP_ID);
    dataAdapterTmp.setViewBinder(new SimpleCursorAdapter.ViewBinder() {
        public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
            if (columnIndex == cursor.getColumnIndex(DBTemperature.COLUMN_ADJUST_TEMP)) {
                int adjustProgress = cursor.getInt(columnIndex);
                SeekBar seekBar = (SeekBar) view.findViewById(R.id.seekBar);
                ((TextView) view).setText("++" + adjustProgress);
                seekBar.setProgress(adjustProgress);
                seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
                    @Override
                    public void onProgressChanged(SeekBar seekBar, int progressValue, boolean fromUser) {
                        //((TextView) view).setText("+" + progressValue);
                        Log.d(MEGADOR, "Progress Changed: " + "+" + progressValue);
                    }
                    @Override
                    public void onStartTrackingTouch(SeekBar seekBar) {
                        Log.d(MEGADOR, "Progress Started:");
                    }
                    @Override
                    public void onStopTrackingTouch(SeekBar seekBar) {
                        Log.d(MEGADOR, "Progress Stopped");
                    }
                });
                return true;
            }
            return false;
        }
    });
    lvTemperature = (ListView) vTemperatures.findViewById(R.id.temperatureListView);
    lvTemperature.setAdapter(dataAdapterTmp);
    setHasOptionsMenu(true);
    lvTemperature.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
        @Override
        public boolean onItemLongClick(AdapterView<?> arg0, View arg1, int pos, long id) {
            operatePosition = pos;
            tmpActionMode = FragmentTemperatureDB.this.getActivity().startActionMode(new ActionBarCallBack());

            return true;
        }
    });
    // Make loader for getting data
    getLoaderManager().initLoader(LIST_TMP_ID, null, this);
    // Inflate the layout for this fragment
    return vTemperatures;
}

SeekBar 无法在处理过程中初始化。为什么堆叠？

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.SeekBar.setProgress(int)' on a null object reference
                                                                      at com.gigavar.adkmegador01.FragmentTemperatureDB.setViewValue(FragmentTemperatureDB.java:69)

第 69 行是 seekBar.setProgress(adjustProgress);

此外，如果我取消注释行

//((TextView) view).setText("+" + progressValue);

无法在内部 class 中访问视图。这是第二个问题。

Answer 1

通过父布局获取所需的 TextView 解决了问题：

viewHolder.adjust = (TextView) ((View)seekBar.getParent()).findViewById(R.id.adjustTemperature);
                viewHolder.adjust.setText("+" + progressValue);

还插入了 ViewHolder

    static class ViewHolder {
    TextView roomTitleTmp;
    TextView adjust;
    TextView temperature;
    SeekBar seekBar;
}

最后，我们在每一行中都使用了 SeekBar 并显示了 progressValue

 class TmpSimpleCursorAdapter extends SimpleCursorAdapter {
    public TmpSimpleCursorAdapter(Context context, int layout, Cursor c, String[] from, int[] to, int flags) {
        super(context, layout, c, from, to, flags);
    }

    ViewHolder viewHolder;
    @Override
    public View newView(Context _context, Cursor _cursor, ViewGroup parent) {
        LayoutInflater inflater = (LayoutInflater) _context.getSystemService(_context.LAYOUT_INFLATER_SERVICE);
        View view = inflater.inflate(R.layout.row_item_temperature, parent, false);
        return view;
    }

    @Override
    public void bindView(View view, Context Context, final Cursor cursor) {
        String title = cursor.getString(cursor.getColumnIndex(DBTemperature.COLUMN_TITLE));
        viewHolder = new ViewHolder();
        viewHolder.roomTitleTmp = (TextView) view.findViewById(R.id.roomTitleTmp);
        viewHolder.roomTitleTmp.setText(title);
        viewHolder.temperature = (TextView) view.findViewById(R.id.roomTemperature);
        viewHolder.adjust = (TextView) view.findViewById(R.id.adjustTemperature);
        viewHolder.seekBar = (SeekBar) view.findViewById(R.id.seekBar);
        viewHolder.adjust.setText("+" + viewHolder.seekBar.getProgress());
        viewHolder.seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progressValue, boolean fromUser) {
                viewHolder.adjust = (TextView) ((View)seekBar.getParent()).findViewById(R.id.adjustTemperature);
                viewHolder.adjust.setText("+" + progressValue);
                Log.d(MEGADOR, "Progress Changed");
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
                Log.d(MEGADOR, "Progress Started");
            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

                Log.d(MEGADOR, "Progress Stopped");
            }

        });

    }
}

如何在 SimpleCursorAdapter 中包含 SeekBar？

How to include SeekBar in SimpleCursorAdapter?

android

seekbar

simplecursoradapter