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GalleryLayoutManager

中文

A custom LayoutManager to build a Gallery or a ViewPager like RecyclerView that shows items in a center-locked and support both HORIZONTAL and VERTICAL scroll.And View Recycle Machine is also supported.

Screenshots

ViewPager

Demo

Usage

1、Build

Gradle

compile 'github.hellocsl:GalleryLayoutManager:1.0.4'

Be care ：if you have used RecyclerView in your project , maybe your should use this library as below and your recyclerview-v7 requires API level 24.2.0 or higher

compile ('github.hellocsl:GalleryLayoutManager:1.0.4'){
    exclude group: 'com.android.support', module:'recyclerview-v7'
}

2、In your code

Basis Usage

Use GalleryLayoutManager#attach(RecycleView recycleView) to setup GalleryLayoutManager for your RecycleView instead of RecycleView#setLayoutManager(LayoutManager manager)

GalleryLayoutManager layoutManager = new GalleryLayoutManager(GalleryLayoutManager.HORIZONTAL);
//layoutManager.attach(mPagerRecycleView);  default selected position is 0
layoutManager.attach(mPagerRecycleView, 30);

//...
//setup adapter for your RecycleView
mPagerRecycleView.setAdapter(imageAdapter);

Listen to selection change

layoutManager2.setCallbackInFling(true);//should receive callback when flinging, default is false
layoutManager.setOnItemSelectedListener(new GalleryLayoutManager.OnItemSelectedListener() {
    @Override
    public void onItemSelected(RecyclerView recyclerView, View item, int position) {
        //.....
    }
});

Apply ItemTransformer just like ViewPager

Implements your ItemTransformer

public class ScaleTransformer implements GalleryLayoutManager.ItemTransformer {

    @Override
    public void transformItem(GalleryLayoutManager layoutManager, View item, float fraction) {
        item.setPivotX(item.getWidth() / 2.f);
        item.setPivotY(item.getHeight()/2.0f);
        float scale = 1 - 0.3f * Math.abs(fraction);
        item.setScaleX(scale);
        item.setScaleY(scale);
    }
}
// Apply ItemTransformer just like ViewPager
layoutManager.setItemTransformer(new ScaleTransformer());

License

Copyright [2017] [Hello Csl]

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.