Android:更改 recyclerView 中视图的可见性 [英] Android: Changing visibility of a view in recyclerView

问题描述

我在我的项目中实现了一个 recyclerView.

I have implemented a recyclerView in my project.

我的 recyclerView row 中有一个 Button.我的recyclerView每一行的代码是这样的:

I have a Button in my recyclerView row. The code for my each row of recyclerView is like this:

保存的message_custom_row.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="4dp"
android:background="#ffffff"
android:orientation="vertical">
<TextView
    android:id="@+id/message"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="16dp"
    android:text="Dummy text" />
<Button
    android:id="@+id/button"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Button"
    android:visibility="gone"/>
</LinearLayout>

按钮的可见性消失.当有人单击其上方的 message textView 时，我想将此按钮的可见性更改为可见".我在 message (textView) 上实现了一个简单的 onClickLiestener() 并在点击 message 时更改了 button 的可见性代码>.我知道这行不通，但我想看看结果.结果很奇怪.如果我点击第 1 行的 textView，第 7、17、19 行等的按钮也 变得可见.我猜这可能是因为缓存了 viewHolder.

The visibility of button is gone. I want to change the visibility of this button to 'visible' when someone clicks on the message textView above it. I implemented a simple onClickLiestener() on the message (textView) and changed the visibility of buttonon click of the message. I knew that wasn't going to work but I wanted to see the results. The results are weird. If I click on the textView of row 1, the button of row 7,17,19 etc also becomes visible. I can guess this might be coz of caching of the viewHolder.

MyViewHolder 是这样的:

MyViewHolder is something like this:

class MyViewHolder extends RecyclerView.ViewHolder {
    TextView message;
    public MyViewHolder(final View itemView) {
        super(itemView);
        message = (TextView) itemView.findViewById(R.id.message);
        message.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                itemView.findViewById(R.id.button).setVisibility(View.VISIBLE);
            }
        });
    }
}

有人可以指导我如何更改recyclerView的仅特定行按钮的可见性?

Can someone guide me how can I change the visibility of a button, of a perticular row only, of my recyclerView?

推荐答案

将点击逻辑从 ViewHolder 移开:

Move the click logic away from the ViewHolder:

class MyViewHolder extends RecyclerView.ViewHolder {
    TextView message;
    Button button;
    public MyViewHolder(View itemView) {
        super(itemView);
        message = (TextView) itemView.findViewById(R.id.message);
        button = (Button) itemView.findViewById(R.id.button);
    }
}

并将其放在适配器的 onBindViewHolder 方法中:

and place it inside the method onBindViewHolder of your adapter:

@Override
public void onBindViewHolder(final MyViewHolder holder, int position) {
    holder.button.setVisibility(View.GONE);        
    holder.message.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            holder.button.setVisibility(View.VISIBLE);
        }
    });
}

ViewHolder 被 RecyclerView 重用，这就是您看到按钮在其他行中可见的原因.

ViewHolder is reused by the RecyclerView, that's why you are seeing the button visible in other rows.

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