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GridRecyclerView. A Grid-specific RecyclerView that can use gridLayoutAnimation.
/*
* Copyright (C) 2014 Freddie (Musenkishi) Lust-Hed
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.musenkishi.gists.view;
import android.content.Context;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.GridLayoutAnimationController;
/**
* An extension of RecyclerView, focused more on resembling a GridView.
* Unlike {@link android.support.v7.widget.RecyclerView}, this view can handle
* {@code <gridLayoutAnimation>} as long as you provide it a
* {@link android.support.v7.widget.GridLayoutManager} in
* {@code setLayoutManager(LayoutManager layout)}.
*
* Created by Freddie (Musenkishi) Lust-Hed.
*/
public class GridRecyclerView extends RecyclerView {
public GridRecyclerView(Context context) {
super(context);
}
public GridRecyclerView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public GridRecyclerView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public void setLayoutManager(LayoutManager layout) {
if (layout instanceof GridLayoutManager){
super.setLayoutManager(layout);
} else {
throw new ClassCastException("You should only use a GridLayoutManager with GridRecyclerView.");
}
}
@Override
protected void attachLayoutAnimationParameters(View child, ViewGroup.LayoutParams params, int index, int count) {
if (getAdapter() != null && getLayoutManager() instanceof GridLayoutManager){
GridLayoutAnimationController.AnimationParameters animationParams =
(GridLayoutAnimationController.AnimationParameters) params.layoutAnimationParameters;
if (animationParams == null) {
animationParams = new GridLayoutAnimationController.AnimationParameters();
params.layoutAnimationParameters = animationParams;
}
int columns = ((GridLayoutManager) getLayoutManager()).getSpanCount();
animationParams.count = count;
animationParams.index = index;
animationParams.columnsCount = columns;
animationParams.rowsCount = count / columns;
final int invertedIndex = count - 1 - index;
animationParams.column = columns - 1 - (invertedIndex % columns);
animationParams.row = animationParams.rowsCount - 1 - invertedIndex / columns;
} else {
super.attachLayoutAnimationParameters(child, params, index, count);
}
}
}
@dominicthomas
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dominicthomas commented Nov 18, 2014

This looks great, thanks! In my implementation attachLayoutAnimationParameters is never called. Any ideas why?

@Musenkishi
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Author

Musenkishi commented Dec 1, 2014

No clue. Are you calling recyclerView.scheduleLayoutAnimation(); after setting the adapter? And have you set android:layoutAnimation="@anim/your_layout_animation" to your in the layout?

@MarsVard
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MarsVard commented Mar 9, 2015

I had the same issue as @dominicthomas setting layout animation xml fixed it.

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