编程设置重力在RecycerView的Andr​​oid项目 [英] Set gravity programmatically for item in RecycerView Android

问题描述

我使用的Andr​​oid RecyclerView使左/右消息框，聊天线。我想重力设置为RecyclerView项目。在通常的方式，我投给ItemView控件和的LinearLayout然后为它ParamLayout重力。但是，如果RecyclerView，似乎不对投给的LinearLayout。它将返回RecyclerView.LayoutParams。因为：

  

的LayoutParams子类RecyclerView的孩子。自定义布局
  鼓励管理人员创造自己的这个子类
  的LayoutParams类来存储任何额外要求每个子视图
  元数据的布局。

和我无法找到设置重力与RecyclerView.LayoutParams方式：|
总之，可能有人发现RecyclerView方式重力项目？请给我建议。

----------- POST解决方案------------------结果
// 1。 RecyclerView儿童

 ＆LT;的LinearLayout
机器人：ID =@ + ID / id_grandparent
机器人：layout_width =match_parent
机器人：layout_height =WRAP_CONTENT
机器人：背景=@机器人：彩色/透明
机器人：分=@机器人：彩色/透明
机器人：重力=左
机器人：方向=垂直＆GT;
＆LT;的LinearLayout
    机器人：ID =@ + ID / id_llparent
    机器人：layout_width =WRAP_CONTENT
    机器人：layout_height =WRAP_CONTENT
    机器人：背景=@绘制/ bg_c​​ustomer_feedback_left
    机器人：重力=左
    机器人：方向=垂直＆GT;
＆LT; / LinearLayout中＆GT;
 

// 2。 OnBindView（）

  LinearLayout.LayoutParams PARAMS =新LinearLayout.LayoutParams（ViewGroup.LayoutParams.WRAP_CONTENT，ViewGroup.LayoutParams.WRAP_CONTENT）;
        PARAMS = setLayoutParamsForParent（参数，可以item.isPosition（））;
        holder.llParentLayout.setLayoutParams（PARAMS）; //对应id_llparent ID
 

// 3。

 私人LinearLayout.LayoutParams setLayoutParamsForParent（LinearLayout.LayoutParams参数，可以布尔位置）{
        params.gravity =持何立场？ Gravity.RIGHT：Gravity.LEFT;
         返回PARAMS;
    }
 

解决方案

问题解决了。
简单地说，我用

  LinearLayout.LayoutParams PARAMS =新LinearLayout.LayoutParams（ViewGroup.LayoutParams.WRAP_CONTENT，ViewGroup.LayoutParams.WRAP_CONTENT）;
 

而不是

  RecyclerView.LayoutParams PARAMS =（RecyclerView.LayoutParams）holder.llGrandParent.getLayoutParams（）;
 

然后设置重力的LinearLayout PARAMS正常。

I am using RecyclerView Android to make a chat line with left/right message box. I want to set gravity to item of RecyclerView. In normally way, I cast itemView to LinearLayout and then set ParamLayout gravity for it. But if RecyclerView, it seems not right to cast to LinearLayout. It will return RecyclerView.LayoutParams. Because of:

LayoutParams subclass for children of RecyclerView. Custom layout managers are encouraged to create their own subclass of this LayoutParams class to store any additional required per-child view metadata about the layout.

And i can't find the way to set gravity with RecyclerView.LayoutParams :| Anyway, could anybody find the way to gravity item in RecyclerView? Pls suggest me.

-----------POST SOLUTION------------------
//1. Children of RecyclerView

      <LinearLayout
android:id="@+id/id_grandparent"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/transparent"
android:divider="@android:color/transparent"
android:gravity="left"
android:orientation="vertical">
<LinearLayout
    android:id="@+id/id_llparent"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@drawable/bg_customer_feedback_left"
    android:gravity="left"
    android:orientation="vertical">
</LinearLayout>

//2. OnBindView()

 LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        params = setLayoutParamsForParent(params, item.isPosition());
        holder.llParentLayout.setLayoutParams(params); //corresponding to id_llparent ID

//3.

     private LinearLayout.LayoutParams setLayoutParamsForParent(LinearLayout.LayoutParams params, boolean position) {
        params.gravity = position ? Gravity.RIGHT : Gravity.LEFT;
         return params;
    }

解决方案

Problem solved. Simply, I using

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

instead of

RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) holder.llGrandParent.getLayoutParams();

And then set gravity for LinearLayout Params normally.

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