Question

我有一个应用程序，用户可以使用颜色选择器或预定义按钮来更改其引号的背景。我希望用户可以通过长按更改预定义按钮的颜色，然后出现颜色选择器，用户现在可以选择将任何颜色保存到按钮。

由于某种原因，颜色选择器监听器方法在我的RecyclerView适配器中不起作用。颜色选择器监听器应该给我当前的选择颜色。我用Log.d("TAG", ""+color);进行了测试我没有得到任何价值

RecyclerView适配器的Viewholder用于背景颜色：

 public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener, ColorPickerDialogFrag2.ColorPickerDialogListener {

    public ImageButton colorButton;

    public ViewHolder(View itemView) {
        super(itemView);

        this.colorButton = (ImageButton) itemView.findViewById(R.id.colorbutton);
        itemView.setOnClickListener(this);
        itemView.setOnLongClickListener(this);

    }

    @Override
    public void onClick(View v) {

        int position = getLayoutPosition();
        MainActivity.relativeLayout.setBackgroundColor(Color.parseColor((mColorButtons.get(position).getColor())));
        PreferenceManager.getDefaultSharedPreferences(App.getAppContext()).edit().putInt(App.BACKGROUND, Color.parseColor(mColorButtons.get(position).getColor())).apply();


    //ColorPicker for customizing colors for buttons

    @Override
    public boolean onLongClick(View v) {


        ColorPickerDialogFrag2 cp = ColorPickerDialogFrag2.newInstance(6, Color.YELLOW);
        cp.setStyle(android.support.v4.app.DialogFragment.STYLE_NORMAL, R.style.AppTheme);
        cp.show(fragmentManager,"d");

        return false;
    }

    @Override
    public void onPreviewColorChanged(int dialogId, int color) {

        //color is the current color from the colorpicker

            Log.d("TAG", ""+color);
            MainActivity.mEditText.setBackgroundColor(color);




    }

    @Override
    public void onColorSelected(int dialogId, int color) {
        Log.d("TAG", ""+color);
        MainActivity.mEditText.setBackgroundColor(color);

    }
}

以下是我的应用目前如何运作的视频： https://www.youtube.com/watch?v=lpYjKMLd9aU

我使用的拾色器库是：https://github.com/danielnilsson9/color-picker-view

Answer 1

问题是您为ColorPickerDialogListener实施ViewHolder，但查看了库here的代码，您可以看到它尝试将activity转换为ColorPickerDialogListener，否则抛出异常。因此，请尝试在MainActivity上实现此侦听器并查看结果。

<强>更新

因此，在这种情况下，您需要将ColorPickerDialogFrag2的逻辑更改为以下内容：

...
private ColorPickerDialogListener mListener;

public static ColorPickerDialogFrag2 newInstance(ColorPickerDialogListener listener,
        int dialogId, int initialColor) {

    ColorPickerDialogFrag2 frag = new ColorPickerDialogFrag2();
    frag.setListener(listener);
    Bundle args = new Bundle();
    args.putInt("id", dialogId);
    args.putInt("init_color", initialColor);

    frag.setArguments(args);

    return frag;
}

public void setListener(ColorPickerDialogListener mListener) {
    this.mListener = mListener;
}
...

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);

    if (mListener == null) {
        // Check for listener in parent activity
        try {
            mListener = (ColorPickerDialogListener) activity;
        } catch (ClassCastException e) {
            e.printStackTrace();
            throw new ClassCastException("Parent activity must implement "
                    + "ColorPickerDialogListener to receive result.");
        }
    }
}
...

然后将ColorPickerDialogListener作为参数传递给newInstance方法：

@Override
public boolean onLongClick(View v) {
    ColorPickerDialogFrag2 cp = ColorPickerDialogFrag2.newInstance(this, 6, Color.YELLOW);
    cp.setStyle(android.support.v4.app.DialogFragment.STYLE_NORMAL, R.style.AppTheme);
    cp.show(fragmentManager,"d");
    return false;
}

颜色选择器不会改变RecyclerView适配器的背景颜色？

1 个答案: