Flexbox for Android

Min SDK   14
Latest Commit   2017-09-27 02:13:35
License   Apache-2.0

Github   https://github.com/google/flexbox-layout

         

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README

README.md

FlexboxLayout

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FlexboxLayout is a library project which brings the similar capabilities of CSS Flexible Box Layout Module to Android.

Installation

Add the following dependency to your build.gradle file:

dependencies {
    compile 'com.google.android:flexbox:0.3.1'
}

Usage

There are two ways of using Flexbox in your layout.

FlexboxLayout

The first one is FlexboxLayout that extends the ViewGroup like LinearLayout and RelativeLayout. You can specify the attributes from a layout XML like:

<com.google.android.flexbox.FlexboxLayout
    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="match_parent"
    app:flexWrap="wrap"
    app:alignItems="stretch"
    app:alignContent="stretch" >

    <TextView
        android:id="@+id/textview1"
        android:layout_width="120dp"
        android:layout_height="80dp"
        app:layout_flexBasisPercent="50%"
        />

    <TextView
        android:id="@+id/textview2"
        android:layout_width="80dp"
        android:layout_height="80dp"
        app:layout_alignSelf="center"
        />

    <TextView
        android:id="@+id/textview3"
        android:layout_width="160dp"
        android:layout_height="80dp"
        app:layout_alignSelf="flex_end"
        />
</com.google.android.flexbox.FlexboxLayout>

Or from code like:

FlexboxLayout flexboxLayout = (FlexboxLayout) findViewById(R.id.flexbox_layout);
flexboxLayout.setFlexDirection(FlexDirection.ROW);

View view = flexboxLayout.getChildAt(0);
FlexboxLayout.LayoutParams lp = (FlexboxLayout.LayoutParams) view.getLayoutParams();
lp.order = -1;
lp.flexGrow = 2;
view.setLayoutParams(lp);

FlexboxLayoutManager (within RecyclerView)

The second one is FlexboxLayoutManager that can be used within RecyclerView.

RecyclerView recyclerView = (RecyclerView) context.findViewById(R.id.recyclerview);
FlexboxLayoutManager layoutManager = new FlexboxLayoutManager(context);
layoutManager.setFlexDirection(FlexDirection.COLUMN);
layoutManager.setJustifyContent(JustifyContent.FLEX_END);
recyclerView.setLayoutManager(layoutManager);

or for the attributes for the children of the FlexboxLayoutManager you can do like:

mImageView.setImageDrawable(drawable);
ViewGroup.LayoutParams lp = mImageView.getLayoutParams();
if (lp instanceof FlexboxLayoutManager.LayoutParams) {
    FlexboxLayoutManager.LayoutParams flexboxLp = (FlexboxLayoutManager.LayoutParams) lp;
    flexboxLp.setFlexGrow(1.0f);
    flexboxLp.setAlignSelf(AlignSelf.FLEX_END);
}

The advantage of using FlexboxLayoutManager is that it recycles the views that go off the screen for reuse for the views that are appearing as the user scrolls instead of inflating every individual view, which consumes much less memory especially when the number of items contained in the Flexbox container is large.

FlexboxLayoutManager in action

Supported attributes / features comparison

Due to some characteristics of RecyclerView, some Flexbox attributes are not available/not implemented to the FlexboxLayoutManager. Here is a quick overview of the attributes/features comparison between the two implementations.

Attribute / Feature FlexboxLayout FlexboxLayoutManager (RecyclerView)
flexDirection Check Check
flexWrap Check Check (except wrap_reverse)
justifyContent Check Check
alignItems Check Check
alignContent Check -
layout_order Check -
layout_flexGrow Check Check
layout_flexShrink Check Check
layout_alignSelf Check Check
layout_flexBasisPercent Check Check
layout_(min/max)Width Check Check
layout_(min/max)Height Check Check
layout_wrapBefore Check Check