Question

我正在使用RecyclerView在网格布局中显示项目。下面是仿真器的图像以及我需要实现的期望结果。左侧（正在执行）图像是我的模拟器上的输出，而右侧（所需）是我想要实现的输出。

活动布局XML

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/parentLayout"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="#d3c3c3">

 <include
    android:id="@+id/toolBarIncluded"
    layout="@layout/toolbar_new_layout" />


<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_below="@+id/toolBarIncluded"
    android:orientation="vertical"
    android:weightSum="1">

    <RelativeLayout

        android:id="@+id/recyclerAdView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="10dp"
        android:layout_weight="0.65"
        android:background="#009688" />

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/recyclerAdView"
        android:layout_gravity="center"
        android:layout_weight="0.35"
        android:background="#00000000"
        android:gravity="center">

        <android.support.v7.widget.RecyclerView

            android:id="@+id/recyclerGridView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_margin="2dp"
            android:background="#00000000"
            android:foregroundGravity="center" />

    </RelativeLayout>

</LinearLayout>

列出项目XML

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/llGridItemLayout"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_gravity="center"
 android:layout_margin="6dp"
 android:background="@drawable/drawable_grid_item_background"
 android:gravity="center"
 android:paddingStart="2dp"
 android:paddingEnd="2dp"
 android:orientation="vertical">

 <ImageView
    android:id="@+id/ivItemIcon"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:scaleType="fitCenter"
    android:src="@drawable/ic_new_receipt_wrong" />

  <TextView
    android:layout_marginTop="6dp"
    android:id="@+id/tvItemName"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:lines="1"
    android:text="My Complaints"
    android:textSize="14sp" />

 </LinearLayout>

活动代码段

    gridLayoutManager = new GridLayoutManager(MainActivity.this, 3);
    recyclerView.setHasFixedSize(true);
    recyclerView.setLayoutManager(gridLayoutManager);
    recyclerView.setAdapter(demoDashAdapter);

适配器代码段

int viewHeight ,viewWidth ;
public onCreateViewHolder(){
   viewHeight = viewGroup.getMeasuredHeight() / 4;
   viewWidth = viewGroup.getMeasuredWidth() / 3;
  ...
}

public onBindViewHolder(){

  viewHolder.itemLayout.setMinimumWidth(viewWidth);
  viewHolder.itemLayout.setMinimumHeight(viewHeight);
  ...
}

因此，我的问题是，如何动态调整recyclerView中的项目大小。请注意，我使用的布局权重相对于weightSum 1为0.65和0.35；

请引导我。

Answer 1

为什么viewHeight = viewGroup.getMeasuredHeight() / 4？

如果要显示3行，只需除以3。还应考虑到item.xml

中的边距

因此，连续获取每个项目的高度应该是这样的：

(viewGroup.getMeasuredHeight()/3) - (marginTop + marginBot)

Answer 2

请勿使用RecyclerView.Adapter来更改视图的布局方式。这是RecyclerView.LayoutManager的责任。

您可以覆盖验证View.LayoutParams的方法以平均分配大小：

 //customized GridLayoutManager
 gridLayoutManager = new GridLayoutManager(MainActivity.this, 3){
     @Override
     public boolean checkLayoutParams(RecyclerView.LayoutParams lp) {
         // force size of viewHolder here, this will override layout_height and layout_width from xml
         lp.height = getHeight() / getSpanCount();
         lp.width = getWidth() / getSpanCount();
         return true;
     }
 };
 recyclerView.setHasFixedSize(true);
 recyclerView.setLayoutManager(gridLayoutManager);

Answer 3

您可以尝试在onCreateViewHolder内部使用LayoutParams，如下所示：

  public Holder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View rowLayout = LayoutInflater.from(context).inflate(R.layout.row, parent, false);
    ViewGroup.LayoutParams layoutParams = rowLayout.getLayoutParams();
    layoutParams.height = (int) (parent.getHeight() * 0.15); // control the recyclerView row height from here
    rowLayout.setLayoutParams(layoutParams);
    return new Holder(rowLayout);
}

调整Recycler的大小和位置查看项目

3 个答案: