Grid形式的RecyclerView注意事项

为了适配不同分辨率屏幕,不能把Item的width写死,否则在屏幕大的手机上,会导致列表两边空白太多,在屏幕小的手机上,会导致右边显示不完整。

最佳实践是让RecyclerView的width和Item的width都为match_parent,在Item内部设置宽高比。

然后在RecyclerView设置padding,在Item内部设置layout_margin。

如果RecyclerView的width不为match_parent则Item的width设置match_parent无效还是wrap_content的效果。

RecyclerView:

<android.support.v7.widget.RecyclerView
    android:id="@+id/list_members"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@android:color/white"
    android:paddingLeft="10dp"
    android:paddingTop="16dp"
    android:paddingRight="10dp"
    android:paddingBottom="16dp"></android.support.v7.widget.RecyclerView>

Item:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingLeft="10dp"
    android:paddingTop="5dp"
    android:paddingRight="10dp"
    android:paddingBottom="5dp">

    <com.facebook.drawee.view.SimpleDraweeView
        android:id="@+id/avatar"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:actualImageScaleType="fitCenter"
        app:layout_constraintBottom_toTopOf="@+id/name"
        app:layout_constraintDimensionRatio="1"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:placeholderImage="@mipmap/ic_avatar_placeholder"
        app:placeholderImageScaleType="fitCenter"
        app:roundAsCircle="true"
        app:viewAspectRatio="1" />

    <TextView
        android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="6dp"
        android:alpha="0.7"
        android:ellipsize="end"
        android:maxLines="1"
        android:textColor="@color/textDark"
        android:textSize="12sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/avatar" />
</android.support.constraint.ConstraintLayout>

效果:

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