Android RecyclerView适配器布局未显示图标

首先，这里有一个屏幕截图（很抱歉，画图编辑不好）：

正如你可能已经注意到的，只有中间的一行有一个图标（绿色圆圈），然而，我正在设置所有行的图标，或者我认为我是。 图标可以是绿色或红色，第一行应该显示绿色图标，最后一行应该显示红色图标，但它们都没有显示任何内容，只有第二行，所以我的问题是，为什么只有一行正确显示图标，当然，我如何修复它

下面是我的适配器代码：

//imports and stuff     
public class EstablishmentAdapter extends RecyclerView.Adapter<EstablishmentViewHolder> {

    private ArrayList<EstablishmentModel> establishmentList;
    private Context context;
    private boolean hasPermission;
    private int selectedPosition = 0;

    public EstablishmentAdapter(ArrayList<EstablishmentModel> establishmentList, Context context, boolean hasPermission) {
        this.establishmentList = establishmentList;
        this.context = context;
        this.hasPermission = hasPermission;
    }

    @Override
    public EstablishmentViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        EstablishmentViewHolder viewHolder;
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_adapter_establishment, parent, false);
        viewHolder = new EstablishmentViewHolder(v, (byte)0, hasPermission);

        return viewHolder;
    }

    @Override
    public void onBindViewHolder(EstablishmentViewHolder holder, final int position) {
        final EstablishmentModel item = establishmentList.get(position);

        Log.d(((EstablishmentActivity)context).logTagDebug, "Position: "+ String.valueOf(position));
        Log.d(((EstablishmentActivity)context).logTagDebug, "ViewHolder: "+ String.valueOf(holder.getAdapterPosition()));

        setUpTextFieldsItemRow(holder, item);
        new ImageDonwloaderTask(holder.ivIcon).execute(item.getIconUrl());

        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                notifyItemChanged(selectedPosition);
                selectedPosition = position;
                notifyItemChanged(selectedPosition);

                //Se a gente botar o full, fazer switch case aqui
                setUpPayContractTypeAction(item);
            }
        });
    }

    private void setUpTextFieldsItemRow(EstablishmentViewHolder holder, EstablishmentModel item) {
        holder.tvClosingTime.setText(item.getClosingTime());
        holder.tvOpeningTime.setText(item.getOpeningTime());
        holder.tvName.setText(item.getName());
        holder.tvType.setText(item.getType());

        if (item.isOpened()) {
            holder.ivWorkingStatus.setImageResource(R.drawable.img_dot_green);
        } else {
            holder.ivWorkingStatus.setImageResource(R.drawable.img_dot_red);
        }
    }

    private void setUpPayContractTypeAction(EstablishmentModel item) {
        if(item.isOpened()) {
            PaymentInfoViewModel p = new PaymentInfoViewModel();
            p.setIdEstablishment(item.getIdEstablishment());
            p.setNameEstablishment(item.getName());

            Intent intent = new Intent(context, CardNumberActivity.class);
            intent.putExtra(ConstantsUtils.PARAM_INTENT_PAYMENT_INFO, p);

            context.startActivity(intent);
        }
        else {
            EstablishmentActivity activity = ((EstablishmentActivity) context);

            String title = String.format(context.getString(R.string.str_msg_error_closed_establishment_title),
                    item.getName());
            String message = String.format(context.getString(R.string.str_msg_error_closed_establishment_msg),
                    item.getName(), item.getOpeningTime(), item.getClosingTime());

            activity.buildAlert(title, message).show();
        }
    }

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

---

请注意linearlayout根中的match_父级和现在是linearlayout的相对布局

<?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="wrap_content"
    android:orientation="horizontal">

    <ImageView
        android:id="@+id/iv_establishment_icon"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_marginStart="@dimen/margin_horizontal_small"
        android:layout_marginLeft="@dimen/margin_horizontal_small"
        android:layout_marginEnd="@dimen/margin_horizontal_small"
        android:layout_marginRight="@dimen/margin_horizontal_small"
        android:layout_marginTop="@dimen/margin_vertical_small">
    </ImageView>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:id="@+id/tv_establishment_name"
            android:layout_marginTop="@dimen/margin_vertical_normal"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="@dimen/font_size_large"
            android:text="Bar Alternativo"
            android:textColor="@color/black">
        </TextView>

        <LinearLayout
            android:layout_marginTop="@dimen/margin_vertical_small"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <TextView
                android:id="@+id/tv_establishment_type"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="@dimen/font_size_tiny"
                android:text="Pub / Bar"
                android:textColor="@color/gray_60_percent">
            </TextView>

            <ImageView
                android:id="@+id/iv_establishment_working_status_icon"
                android:src="@drawable/img_dot_green"
                android:layout_marginStart="@dimen/margin_horizontal_big"
                android:layout_marginLeft="@dimen/margin_horizontal_big"
                android:layout_toRightOf="@+id/tv_establishment_type"
                android:layout_toEndOf="@+id/tv_establishment_type"
                android:layout_width="17dp"
                android:layout_height="17dp" />

        </LinearLayout>

        <LinearLayout
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:orientation="horizontal"
            >

            <TextView
                android:id="@+id/tv_establishment_opening_time"
                android:layout_marginTop="@dimen/margin_vertical_normal"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="@dimen/font_size_very_tiny"
                android:textColor="@color/gray_30_percent"
                android:text="19:00"
                >
            </TextView>

            <TextView
                android:id="@+id/tv_establishment_separator_time"
                android:layout_marginTop="@dimen/margin_vertical_normal"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="@dimen/font_size_very_tiny"
                android:text="@string/str_screen_txt_hyphen"
                android:textColor="@color/gray_30_percent"
                >
            </TextView>

            <TextView
                android:id="@+id/tv_establishment_closing_time"
                android:layout_marginTop="@dimen/margin_vertical_normal"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="@dimen/font_size_very_tiny"
                android:text="02:00"
                android:textColor="@color/gray_30_percent"
                >
            </TextView>

            <TextView
                android:id="@+id/tv_establishment_place_distance"
                android:layout_marginTop="10dp"
                android:layout_width="wrap_content"
                android:layout_marginLeft="@dimen/margin_horizontal_normal"
                android:layout_marginStart="@dimen/margin_horizontal_normal"
                android:layout_height="wrap_content"
                android:textSize="@dimen/font_size_very_tiny"
                >
            </TextView>

        </LinearLayout>

    </LinearLayout>
</LinearLayout>

---

您尚未在onBindViewHolder中的任何位置设置图像资源。直接在onBindViewHolder中设置图像资源，或将if条件移出方法setUpPayContractTypeAction

只需注意方法setUpPayContractTypeAction，它包含以下if条件，并且您在onClick事件中调用了方法setUpPayContractTypeAction，这意味着将在项目单击事件中设置图像资源

if (item.isOpened()) {

  holder.ivWorkingStatus.setImageResource(R.drawable.img_dot_green);

} else {

  holder.ivWorkingStatus.setImageResource(R.drawable.img_dot_red);

}

---

问题是您将图像视图的左侧与文本视图的右侧对齐

<RelativeLayout
        android:layout_marginTop="@dimen/margin_vertical_small"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/tv_establishment_type"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="@dimen/font_size_tiny"
            android:text="Pub / Bar"
            android:textColor="@color/gray_60_percent"
            >
        </TextView>

        <ImageView
            android:id="@+id/iv_establishment_working_status_icon"
            android:src="@drawable/img_dot_green"
            android:layout_marginStart="@dimen/margin_horizontal_big"
            android:layout_marginLeft="@dimen/margin_horizontal_big"
            android:layout_toRightOf="@+id/tv_establishment_type"
            android:layout_toEndOf="@+id/tv_establishment_type"
            android:layout_width="17dp"
            android:layout_height="17dp" />

    </RelativeLayout>

---

随着文本的增长，您将看不到任何图像。尝试使用重力右侧的Linearlayout，并将textview的权重设置为1

我认为是图像开头的水平边距太大造成了问题。请尝试删除边距并对齐到父级的右侧，然后重试

---

此外，如果要以编程方式使视图在if条件中的任何位置不可见，也必须实现else代码，否则适配器也会将该可见性状态复制到相邻的列表项。

是否可以发布列表项的xml？是，请稍等-编辑：DoneMy首先想到的是包含

iv\u建立\工作\状态\图标的相对布局太短，无法显示图标。为了进行测试，请尝试将图标的高度和宽度设置为5dp或其他什么，而不是17dp，并查看它是否显示upI这样做了，只有第二行一直显示图标，看起来有什么东西在隐藏它。您没有完全发布holder类（至少从您实例化它的方式来看）。不管怎么说，很难说是怎么回事。你最好从小事做起，删除与有问题的ImageView相关的代码（任何代码），将其设置为基本可绘制（如你的应用程序图标），这样你就可以看到它，然后从那里开始，直到问题出现。
<?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="wrap_content"
    android:orientation="horizontal">

    <ImageView
        android:id="@+id/iv_establishment_icon"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_marginStart="@dimen/margin_horizontal_small"
        android:layout_marginLeft="@dimen/margin_horizontal_small"
        android:layout_marginEnd="@dimen/margin_horizontal_small"
        android:layout_marginRight="@dimen/margin_horizontal_small"
        android:layout_marginTop="@dimen/margin_vertical_small">
    </ImageView>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:id="@+id/tv_establishment_name"
            android:layout_marginTop="@dimen/margin_vertical_normal"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="@dimen/font_size_large"
            android:text="Bar Alternativo"
            android:textColor="@color/black">
        </TextView>

        <LinearLayout
            android:layout_marginTop="@dimen/margin_vertical_small"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <TextView
                android:id="@+id/tv_establishment_type"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="@dimen/font_size_tiny"
                android:text="Pub / Bar"
                android:textColor="@color/gray_60_percent">
            </TextView>

            <ImageView
                android:id="@+id/iv_establishment_working_status_icon"
                android:src="@drawable/img_dot_green"
                android:layout_marginStart="@dimen/margin_horizontal_big"
                android:layout_marginLeft="@dimen/margin_horizontal_big"
                android:layout_toRightOf="@+id/tv_establishment_type"
                android:layout_toEndOf="@+id/tv_establishment_type"
                android:layout_width="17dp"
                android:layout_height="17dp" />

        </LinearLayout>

        <LinearLayout
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:orientation="horizontal"
            >

            <TextView
                android:id="@+id/tv_establishment_opening_time"
                android:layout_marginTop="@dimen/margin_vertical_normal"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="@dimen/font_size_very_tiny"
                android:textColor="@color/gray_30_percent"
                android:text="19:00"
                >
            </TextView>

            <TextView
                android:id="@+id/tv_establishment_separator_time"
                android:layout_marginTop="@dimen/margin_vertical_normal"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="@dimen/font_size_very_tiny"
                android:text="@string/str_screen_txt_hyphen"
                android:textColor="@color/gray_30_percent"
                >
            </TextView>

            <TextView
                android:id="@+id/tv_establishment_closing_time"
                android:layout_marginTop="@dimen/margin_vertical_normal"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="@dimen/font_size_very_tiny"
                android:text="02:00"
                android:textColor="@color/gray_30_percent"
                >
            </TextView>

            <TextView
                android:id="@+id/tv_establishment_place_distance"
                android:layout_marginTop="10dp"
                android:layout_width="wrap_content"
                android:layout_marginLeft="@dimen/margin_horizontal_normal"
                android:layout_marginStart="@dimen/margin_horizontal_normal"
                android:layout_height="wrap_content"
                android:textSize="@dimen/font_size_very_tiny"
                >
            </TextView>

        </LinearLayout>

    </LinearLayout>
</LinearLayout>

if (item.isOpened()) {

  holder.ivWorkingStatus.setImageResource(R.drawable.img_dot_green);

} else {

  holder.ivWorkingStatus.setImageResource(R.drawable.img_dot_red);

}

<RelativeLayout
        android:layout_marginTop="@dimen/margin_vertical_small"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/tv_establishment_type"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="@dimen/font_size_tiny"
            android:text="Pub / Bar"
            android:textColor="@color/gray_60_percent"
            >
        </TextView>

        <ImageView
            android:id="@+id/iv_establishment_working_status_icon"
            android:src="@drawable/img_dot_green"
            android:layout_marginStart="@dimen/margin_horizontal_big"
            android:layout_marginLeft="@dimen/margin_horizontal_big"
            android:layout_toRightOf="@+id/tv_establishment_type"
            android:layout_toEndOf="@+id/tv_establishment_type"
            android:layout_width="17dp"
            android:layout_height="17dp" />

    </RelativeLayout>