recyclerview 中的项目设置 layoutparams 错误

Question

我想要在我的通知应用程序中：标题存在，文本不存在 = 标题应垂直居中文本存在，标题不存在 = 文本应垂直居中

我的适配器是这样的：

public View view_title, view_text
public ViewHolder(View v) {
        super(v);
        ...
        view_title = v.findViewById(R.id.title);
        view_text = v.findViewById(R.id.text);   
        title = (TextView) v.findViewById(R.id.title);
        text = (TextView) v.findViewById(R.id.text); 
        ...
}
@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {

    holder.title.setText(utilsM.getTitleByPos("tasks", position));
    holder.text.setText(utilsM.getNoticeByPos("tasks", position));

    if ( ( holder.title.getText().length() > 0) && (holder.text.getText().length() == 0) ) {

        holder.view_title.setVisibility(View.VISIBLE);
        holder.view_text.setVisibility(View.INVISIBLE);

        RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) holder.view_title.getLayoutParams();
        params.addRule(RelativeLayout.CENTER_VERTICAL, RelativeLayout.TRUE);

        holder.view_title.setLayoutParams(params);

        debug("title: " + holder.title.getText());
        debug("text: " + holder.text.getText());

    } else if ( ( holder.text.getText().length() > 0) && (holder.title.getText().length() == 0) ) {

        holder.view_title.setVisibility(View.INVISIBLE);
        holder.view_text.setVisibility(View.VISIBLE);

        RelativeLayout.LayoutParams params2 = (RelativeLayout.LayoutParams) holder.view_text.getLayoutParams();
        params2.addRule(RelativeLayout.CENTER_VERTICAL, RelativeLayout.TRUE);
        holder.view_text.setLayoutParams(params2);
    } else {
        holder.view_title.setVisibility(View.VISIBLE);
        holder.view_text.setVisibility(View.VISIBLE);
    }

我发现我可以在我的代码中设置 "android:layout_centerVertical="true"：

        RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) holder.view_title.getLayoutParams();
        params.addRule(RelativeLayout.CENTER_VERTICAL, RelativeLayout.TRUE);

        holder.view_title.setLayoutParams(params);

一切正常。但有时确实会以标题或文本为中心的通知，尽管标题和文本都存在。怎么样？

看起来像这样：

抱歉我的英语不好 :D 有什么建议吗？

Answer 1

您忘记删除两个文本的最后 else 块中的 CenterVertical 属性。并且不要忘记对齐您的文本以免相互重叠。

RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) holder.view_title.getLayoutParams();

RelativeLayout.LayoutParams params2 = (RelativeLayout.LayoutParams) holder.view_text.getLayoutParams();

    if ( ( holder.title.getText().length() > 0) && (holder.text.getText().length() == 0) ) {

            holder.view_title.setVisibility(View.VISIBLE);
            holder.view_text.setVisibility(View.INVISIBLE);

            params.addRule(RelativeLayout.CENTER_VERTICAL, RelativeLayout.TRUE);

            holder.view_title.setLayoutParams(params);

            debug("title: " + holder.title.getText());
            debug("text: " + holder.text.getText());

        } else if ( ( holder.text.getText().length() > 0) && (holder.title.getText().length() == 0) ) {

            holder.view_title.setVisibility(View.INVISIBLE);
            holder.view_text.setVisibility(View.VISIBLE);

            params2.addRule(RelativeLayout.CENTER_VERTICAL, RelativeLayout.TRUE);
            holder.view_text.setLayoutParams(params2);
        } else {
            // YOU NEED TO RESET YOUR 2 LAYOUT PARAMS HERE
            params.addRule(RelativeLayout.CENTER_VERTICAL, 0);
            params2.addRule(RelativeLayout.CENTER_VERTICAL, 0);

            // ..... 
            // align your texts here
            // ....

            holder.view_title.setLayoutParams(params);
            holder.view_text.setLayoutParams(params2);

            holder.view_title.setVisibility(View.VISIBLE);
            holder.view_text.setVisibility(View.VISIBLE);
        }

要删除规则，请使用：

layoutParams.addRule(RelativeLayout.CENTER_VERTICAL, 0);

或（对于API级别>=17）

layoutParams.removeRule(RelativeLayout.CENTER_VERTICAL);

Answer 2

在代码中，

 LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) submitCashbackFailedViewHolder.contentViewRlly.getLayoutParams();

    layoutParams.height = LinearLayout.LayoutParams.MATCH_PARENT;

    layoutParams.width = UiUtil.dpToPx(mContext,UiUtil.px2dip(UiUtil.getScreenWidth()) - 23);

问题是

layoutParams.height 需要像素。
但我用 dp 来设置它

recyclerview 中的项目设置 layoutparams 错误

Items in recyclerview setting layoutparams wrong

android

android-layout

android-adapter

android-recyclerview