android - 以编程方式为 RecyclerView Android 中的项目设置重力

Question

我正在使用 RecyclerView Android 创建带有左/右消息框的聊天行。我想将重力设置为 RecyclerView 的项目。通常，我将 itemView 转换为 LinearLayout，然后为其设置 ParamLayout 引力。但是如果是RecyclerView，投给LinearLayout好像不太对。它将返回 RecyclerView.LayoutParams。因为:

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.

而且我找不到使用 RecyclerView.LayoutParams 设置重力的方法:| 不管怎样，有人能在 RecyclerView 中找到引力项的方法吗？请建议我。

------------后期解决方案----------------
//1。 RecyclerView 的 child

      <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;
    }

Answer 1

问题解决了。 简单地说，我使用

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

代替

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

然后正常设置LinearLayout Params的重力。