如何在 View holder 中使用 OnClick？

Question

我想要的是……

当点击Main Activity中的按钮时，Color Selection Activity会运行，点击recycler view中的按钮，Main Activity中的按钮会变成recycler view中点击按钮的颜色。

但是recyler view 很好用，但是View Holder 里面的OnCilck 不行。

我找了很久。但我不知道原因。如果您能帮助我，我将不胜感激。

颜色选择活动

adapter = new Adapter(this, itemList, ColorSelectionActivity.this);
listview.setAdapter(adapter);

主要活动

public void onColorButtonClick(View v)
{
    Intent intent = new Intent(getApplicationContext(), ColorSelectionActivity.class);

    startActivityForResult(intent, GET_COLOR_REQUEST);
}

protected void onActivityResult(int requestCode, int resultCode, Intent intent, View v)
{
    super.onActivityResult(requestCode, resultCode, intent);

    if(requestCode == GET_COLOR_REQUEST)
    {
        if(resultCode == RESULT_OK)
        {
            GradientDrawable bgShape = (GradientDrawable) v.getBackground();

            bgShape.setColor(Color.parseColor(intent.getStringExtra("name")));
        }
    }
}

适配器

public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder>
{
    private ArrayList<String> itemList;
    private Context context;
    private Activity colorSelectionActivity;

public Adapter(Context context, ArrayList<String> itemList, ColorSelectionActivity colorSelectionActivity)
{
    this.context = context;
    this.itemList = itemList;
    this.colorSelectionActivity = colorSelectionActivity;
}

private Map<String, String> ColorMap()
{
    Map<String, String> colorMap = new HashMap<>();

    colorMap.put("Anger", "#ff4343");
    colorMap.put("Confusion", "#ff8e43");
    colorMap.put("Exciting", "#ffff4f");
    colorMap.put("Normal", "#85e070");
    colorMap.put("Joy", "#ffa8ab");
    colorMap.put("Sad", "#80a9e0");
    colorMap.put("Tired", "#6662bf");
    colorMap.put("Melancholy", "#bd72db");

    return colorMap;
}

@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
{
    View view = LayoutInflater.from(context).inflate(R.layout.color_item, parent, false);

    return new ViewHolder(view);
}

@Override
public void onBindViewHolder(ViewHolder holder, int position)
{
    String item = itemList.get(position);

    holder.textview.setText(item);
    holder.textview.setTag(item);

    GradientDrawable bgShape = (GradientDrawable) holder.button.getBackground();

    if (ColorMap().containsKey(itemList.get(position)))
        bgShape.setColor(Color.parseColor(ColorMap().get(itemList.get(position))));
}

@Override
public int getItemCount()
{
    return itemList.size();
}

public class ViewHolder extends RecyclerView.ViewHolder
{
    public TextView textview;
    public Button button;

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

        itemView.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)      //I've been debugging, this part does not work and just through.
            {
                int pos = getAdapterPosition();
                if (pos != RecyclerView.NO_POSITION)
                {
                    Intent intent = new Intent();
                    intent.putExtra("name", ColorMap().get(itemList.get((pos))));
                    colorSelectionActivity.setResult(Activity.RESULT_OK, intent);
                    notifyItemChanged(pos);
                    colorSelectionActivity.finish();
                }
            }
        });

        textview = itemView.findViewById(R.id.item_text);
        button = itemView.findViewById(R.id.item_button);
    }
}

Answer 1

把你的点击Listner放到viewholder中

@Override

public void onBindViewHolder(ViewHolder holder, int position)

{
    String item = itemList.get(position);
holder.textview.setText(item);
holder.textview.setTag(item);

GradientDrawable bgShape = (GradientDrawable) holder.button.getBackground();

if (ColorMap().containsKey(itemList.get(position)))
    bgShape.setColor(Color.parseColor(ColorMap().get(itemList.get(position))));
    holder.button.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)      //I've been debugging, this part does not work and just through.
            {
                int pos = getAdapterPosition();
                if (pos != RecyclerView.NO_POSITION)
                {
                    Intent intent = new Intent();
                    intent.putExtra("name", ColorMap().get(itemList.get((pos))));
                    colorSelectionActivity.setResult(Activity.RESULT_OK, intent);
                    notifyItemChanged(pos);
                    colorSelectionActivity.finish();
                }
            }
        });
}

之前您要求回收商查看项目对您的点击列表做出响应。但现在你问了

holder.button.setOnClickListener

所以点击按钮时只有你的颜色会改变。

Answer 2

你应该改变这个：

itemView.setOnClickListener(new View.OnClickListener()
{
    @Override
    public void onClick(View v)
    {
        ...
    }
});

到这里：

itemView.button.setOnClickListener(new View.OnClickListener()
    {
        @Override
        public void onClick(View v)
        {
            ...
        }
    });