在Recyclerview中的TextView上添加setForeground，有时它无法正常工作

时间：2018-03-17 06:12:55

标签： android android-recyclerview

我正在尝试在Recyclerview中的TextView上设置FORForeground，但有时当我向上滚动向下或反之亦然时，它无法正常工作。有关详细信息，请参阅屏幕截图。

1）当数据第一次加载时，它看起来像： enter image description here

2）当我向上滚动然后向下滚动它的样子： enter image description here

我的适配器类代码：

public class ChatAdapter extends  RecyclerView.Adapter<ChatAdapter.MessageViewHolder>  {

    private List<FriendlyMessageModel> friendlyMessageModelList;
    private String android_id;
    public Context context;

    public ChatAdapter(Context context, List<FriendlyMessageModel> friendlyMessageModelList) {
        this.friendlyMessageModelList = friendlyMessageModelList;
        FireBaseSetup fireBaseSetup = new FireBaseSetup();
        android_id = fireBaseSetup.getUID();
        this.context = context;
    }

    @NonNull
    @Override
    public MessageViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.item_message, parent, false);

        return new MessageViewHolder(itemView);
    }

    @SuppressLint("ClickableViewAccessibility")
    @Override
    public void onBindViewHolder(final MessageViewHolder holder, int position) {
        FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(
                FrameLayout.LayoutParams.WRAP_CONTENT,
                FrameLayout.LayoutParams.WRAP_CONTENT);

        LinearLayout.LayoutParams params1 = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);

        FriendlyMessageModel friendlyMessageModel = friendlyMessageModelList.get(position);
        String author =  friendlyMessageModel.getName();
        boolean isPhoto = friendlyMessageModel.getPhotoUrl()!=null;

        if(author.equals(android_id))
        {
            params.gravity = Gravity.RIGHT;
            params1.gravity = Gravity.RIGHT;
        }
        else{
            params.gravity = Gravity.LEFT;
            params1.gravity = Gravity.LEFT;
        }

        if (params.gravity == Gravity.RIGHT) {
            if(isPhoto)
            {
                holder.ivPhoto.setBackgroundDrawable(context.getResources().getDrawable(R.drawable.rounded_corner1));
                holder.ivPhoto.setVisibility(View.VISIBLE);
                holder.tvMessage.setVisibility(View.GONE);
                Glide.with(holder.ivPhoto.getContext())
                        .load(friendlyMessageModel.getPhotoUrl())
                        .into(holder.ivPhoto);

            }
            else {
                holder.tvMessage.setBackgroundDrawable(context.getResources().getDrawable(R.drawable.rounded_corner1));
                holder.ivPhoto.setVisibility(View.GONE);
                holder.tvMessage.setVisibility(View.VISIBLE);

                //holder.tvMessage.setLayoutParams(params);
                holder.tvMessage.setText(friendlyMessageModel.getText());

            }

        }else{
            if(isPhoto)
            {
                holder.ivPhoto.setBackgroundDrawable(context.getResources().getDrawable(R.drawable.rounded_corner2));
                holder.ivPhoto.setVisibility(View.VISIBLE);
                holder.tvMessage.setVisibility(View.GONE);
                Glide.with(holder.ivPhoto.getContext())
                        .load(friendlyMessageModel.getPhotoUrl())
                        .into(holder.ivPhoto);
            }
            else {
                holder.tvMessage.setBackgroundDrawable(context.getResources().getDrawable(R.drawable.rounded_corner2));
                holder.ivPhoto.setVisibility(View.GONE);
                holder.tvMessage.setVisibility(View.VISIBLE);

                //holder.tvMessage.setLayoutParams(params);
                holder.tvMessage.setText(friendlyMessageModel.getText());
            }
        }
        holder.tvAuthor.setLayoutParams(params);
        holder.tvAuthor.setText(friendlyMessageModel.getName());

        // TODO: 21/2/18 added by kd
        final int color = Color.parseColor("#FADA5E");
        final Drawable drawable = new ColorDrawable(color);

        if(!friendlyMessageModel.isHide()){
            holder.confidemsg.setForeground(drawable);
            holder.confidemsg.setLayoutParams(params1);
            // TODO: 21/2/18 added by kd  confide feature
            holder.confidemsg.setOnTouchListener(new View.OnTouchListener() {
                @Override
                public boolean onTouch(View view, MotionEvent event) {
                    switch(event.getAction()) {
                        case MotionEvent.ACTION_DOWN: {
                            holder.confidemsg.setForeground(null);
                            return true; // if you want to handle the touch event
                        }
                        case MotionEvent.ACTION_UP: {
                            // RELEASED
                            holder.confidemsg.setForeground(drawable);
                            return true; // if you want to handle the touch event
                        }
                        case MotionEvent.ACTION_CANCEL: {
                            holder.confidemsg.setForeground(drawable);
                            return true;
                        }
                    }
                    return false;
                }
            });


            // TODO: 21/2/18 added by kd  confide feature
            holder.confideimg.setForeground(drawable);
            holder.confideimg.setLayoutParams(params1);
            holder.confideimg.setOnTouchListener(new View.OnTouchListener() {
                @Override
                public boolean onTouch(View view, MotionEvent event) {
                    switch(event.getAction()) {
                        case MotionEvent.ACTION_DOWN: {
                            // PRESSED
                            holder.confideimg.setForeground(null);
                            return true; // if you want to handle the touch event
                        }
                        case MotionEvent.ACTION_UP: {
                            // RELEASED
                            holder.confideimg.setForeground(drawable);
                            return true; // if you want to handle the touch event
                        }
                        case MotionEvent.ACTION_CANCEL: {
                            holder.confideimg.setForeground(drawable);
                            return true;
                        }
                    }
                    return false;
                }
            });
        }


//        Calendar currnetDateTime = Calendar.getInstance();
//        SimpleDateFormat df = new SimpleDateFormat("HH:mm a");
//        String  currentTime = df.format(currnetDateTime.getTime());
//
//        holder.tvTime.setLayoutParams(params);
//        holder.tvTime.setText(currentTime);
    }

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

    public class MessageViewHolder extends RecyclerView.ViewHolder {
        ImageView ivPhoto;
        TextView tvMessage, tvAuthor, tvTime;
        // TODO: 21/2/18 added by kd
        //CardView confide;
        FrameLayout confidemsg, confideimg;

        public MessageViewHolder(View itemView) {
            super(itemView);
            ivPhoto = itemView.findViewById(R.id.photoImageView);
            tvMessage = itemView.findViewById(R.id.messageTextView);
            tvAuthor = itemView.findViewById(R.id.nameTextView);
            tvTime = itemView.findViewById(R.id.time);

            //todo added by kd
            confidemsg = itemView.findViewById(R.id.confidemsg);
            confideimg = itemView.findViewById(R.id.confideimg);
        }
    }
}

我的问题很简单，如何解决第二个截图中的问题。每当我向上和向下滚动它总会显示出来。

3 个答案:

答案 0 :(得分：0)

我认为问题是当您滚动RecyclerView拦截TouchEvent时，您将无法收到ACTION_UP。

在项目上设置TouchListener的最佳方法是将ItemTouchHelper设置为RecyclerView本身覆盖onChildDraw方法。

答案 1 :(得分：0)

当你在recycler视图中向上和向下滚动时，recyclelerview适配器每次调用onBindViewHolder（）方法。在textView上的颜色设置放在onBindViewHolder（）中。

  @Override
public void onBindViewHolder(ItemViewHolder holder, int position) {

 }

答案 2 :(得分：0)

我做了一些简单的更改，只检查了底色，它运行良好，尝试下面的代码并测试它，并正在努力不改变scolling时间.. 

public class ChatAdapter extends RecyclerView.Adapter<ChatAdapter.MessageViewHolder> {

private List<String> friendlyMessageModelList;
private String android_id;
public Context context;

public ChatAdapter(Context context, List<String> friendlyMessageModelList) {
    this.friendlyMessageModelList = friendlyMessageModelList;
    //FireBaseSetup fireBaseSetup = new FireBaseSetup();
    //android_id = fireBaseSetup.getUID();
    this.context = context;
}

@NonNull
@Override
public MessageViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View itemView = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.item_message, parent, false);

    return new MessageViewHolder(itemView);
}

@SuppressLint({"ClickableViewAccessibility", "ResourceAsColor"})
@Override
public void onBindViewHolder(final MessageViewHolder holder, int position) {
    FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(
            FrameLayout.LayoutParams.WRAP_CONTENT,
            FrameLayout.LayoutParams.WRAP_CONTENT);

    LinearLayout.LayoutParams params1 = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);

    String friendlyMessageModel = friendlyMessageModelList.get(position);

// String author = friendlyMessageModel.getName（）;         // boolean isPhoto = friendlyMessageModel.getPhotoUrl（）！= null; 

    if (friendlyMessageModel.equals("black")) {
        holder.tvTime.setBackgroundColor(R.color.colorAccent);
    }

// Calendar currnetDateTime = Calendar.getInstance（）; // SimpleDateFormat df = new SimpleDateFormat（＆＃34; HH：mm a＆＃34;）; // String currentTime = df.format（currnetDateTime.getTime（））; // // holder.tvTime.setLayoutParams（params）; // holder.tvTime.setText（currentTime）;     } 

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

class MessageViewHolder extends RecyclerView.ViewHolder {
    ImageView ivPhoto;
    TextView tvTime;

    // TODO: 21/2/18 added by kd
    //CardView confide;
    public MessageViewHolder(View itemView) {
        super(itemView);
        tvTime = itemView.findViewById(R.id.timeData);

        //todo added by kd
    }
}

}

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