Question

我有一个回收视图，显示了几个（8）卡片视图。在每个cardview中，有几个元素，如文本，图像按钮等。在Adapter类中（RvAdapter扩展了RecyclerView.Adapter）我有一个代码如下。我想要做的是使用相同按钮的OnClickListener更改分配给图像按钮的Vector（.xml）的颜色。

public RvAdapter(Context context,List<Person> persons) {
    this.mContext=context;
    this.persons=persons;
}

 @Override
 public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType){
    View v= LayoutInflater.from(parent.getContext()).inflate(R.layout.card_view_content,parent,false);
    ViewHolder vh=new ViewHolder(v);
    return vh;
}

@Override
public void onBindViewHolder(ViewHolder holder, final int position) {
    final ViewHolder mHolder=holder;
    mHolder.personName.setText(persons.get(position).name);
    mHolder.personAge.setText(( persons.get(position).age));

    mHolder.cvCard.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Toast.makeText(mContext,"card number:"+String.valueOf(position),Toast.LENGTH_SHORT).show();
        }
    });

    //this is where the error comes
    mHolder.alarmImageButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            //this code line doesnt work
            //mHolder.alarmImageButton.setColorFilter(R.color.colorAccent);

           //this code line works... but it changes the imagebutton color of another card view at below of the recycler view 
           mHolder.alarmImageButton.setColorFilter(Color.argb(255,255,255,255)); 
           Toast.makeText(mContext,"button:"+String.valueOf(position),Toast.LENGTH_SHORT).show();
        }
    });
}

RecyclerView里面有8张卡片视图。单击第一个cardview的图像按钮的图像按钮时，它会将颜色更改为白色。但错误是它也改变了第7张卡片的图像按钮颜色。单击第二张cardview的图像按钮时，它也会更改第8张卡片的图像按钮颜色。然而，Toast工作得很好。它显示click事件已正确识别每个cardview和imagebutton的位置。

我无法正确理解这一点。第一张卡的第7张卡片视图是如何相互连接的？

这是我的ViewHolder类

public class ViewHolder extends RecyclerView.ViewHolder{
    CardView cvCard;
    TextView personName;
    TextView personAge;
    ImageButton alarmImageButton;
    public ViewHolder(View itemView) {
        super(itemView);
        cvCard=(CardView)itemView.findViewById(R.id.cv_card);
        personName=(TextView)itemView.findViewById(R.id.txt_person_name);
        personAge=(TextView)itemView.findViewById(R.id.txt_person_age);
        alarmImageButton=(ImageButton)itemView.findViewById(R.id.alarm_image_button);
}

如果有人可以帮我找到这个错误，那将是一个很好的帮助......

Answer 1

我无法正确理解这一点。如何第1张牌第7张牌观点相互联系？

使用RecyclerView的重点是View正在被回收。您设置ImageButton的colorFilter，但同样的按钮也可以在回收的View中使用。

您应该存储RecyclerView行的点击状态，并相应地为ImageButton中的每个onBindViewHolder()设置colorFilter。

例如：

// a HashSet to store the clicked positions
private HashSet<Integer> clickedPositions = new HashSet<>();

@Override
public void onBindViewHolder(ViewHolder holder, int position) {
    final ViewHolder mHolder = holder;
    mHolder.personName.setText(persons.get(position).name);
    mHolder.personAge.setText((persons.get(position).age));

    mHolder.cvCard.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Toast.makeText(mContext, "card number:" + String.valueOf(position),
                    Toast.LENGTH_SHORT).show();
        }
    });

    if (clickedPositions.contains(mHolder.getAdapterPosition())) {
        // the current item is clicked, change its color
        mHolder.alarmImageButton.setColorFilter(Color.argb(255, 255, 255, 255));
    } else {
        // else change it to another color
        mHolder.alarmImageButton.setColorFilter(Color.argb(0, 0, 0, 0));
    }

    mHolder.alarmImageButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Toast.makeText(mContext, "button:" + String.valueOf(position),
                    Toast.LENGTH_SHORT).show();

            // if the item is already clicked, remove it from the clicked items
            if (!clickedPositions.remove(mHolder.getAdapterPosition())) {
                // if not clicked, add it to the clicked items
                clickedPositions.add(mHolder.getAdapterPosition());
            }
            // and notify the Adapter that the item is changed
            notifyItemChanged(mHolder.getAdapterPosition());
        }
    });
}

Answer 2

将ids存储在sparsebooleanarray中。如果颜色改变则存储为真，否则为假。

将这些方法添加到适配器。

＆＃13;

private SparseBooleanArray mSelectedItemsIds;

//Methods to do Selection

    public void toggleSelection(int position) {
        selectView(position, !mSelectedItemsIds.get(position));
    }


    //Remove selected selections
    public void removeSelection() {
        mSelectedItemsIds = new SparseBooleanArray();
        notifyDataSetChanged();
    }


    //Put or delete selected position into SparseBooleanArray
    public void selectView(int position, boolean value) {
        if (value)
            mSelectedItemsIds.put(position, value);
        else
            mSelectedItemsIds.delete(position);

        // notifyItemChangedAtPosition(position);
        notifyDataSetChanged();
    }

＆＃13;

然后在需要时调用它。

如何在RecyclerView中更改分配给ImageButton的矢量的颜色？

2 个答案: