Jak mogę zrobić coś takiego jak FlowLayout w systemie Android?

Jak mogę zrobić coś takiego FlowLayoutw Androidzie?

Jeśli obejrzysz wykład, który wygłosiłem podczas dnia Devoxx University (dostępny na parleys.com ), dowiesz się, jak to zrobić samodzielnie. Podczas wykładu napisałem FlowLayoutimplementację na żywo na scenie, aby pokazać, jak proste jest pisanie niestandardowych układów.

Implementacja jest hostowana tutaj .

Należy używać FlexboxLayoutz flexWrap="wrap"atrybutem.

<com.google.android.flexbox.FlexboxLayout 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     app:flexWrap="wrap">

<!-- contents go here -->

</com.google.android.flexbox.FlexboxLayout>

Aby uzyskać instrukcje kompilacji, zobacz repozytorium github.

Więcej na ten temat - https://android-developers.googleblog.com/2017/02/build-f flexible - layouts - with.html

Nie mam wystarczającej reputacji, aby opublikować komentarz do odpowiedzi Romaina Guya, ale właśnie tam powinna być ta odpowiedź (utworzyłem konto tylko po to, aby udostępnić moją zmianę).

W każdym razie widzę, że inni ludzie odkryli, że jego całkiem fajne rozwiązanie FlowLayout ma pewne problemy. Sam mogłem go znaleźć i widziałem, jak inne, że niektóre dzieci zostały obcięte. Patrząc szczegółowo na algorytm, wydaje się, że jest to bardzo prosty błąd w obliczaniu wysokości. Kiedy ostatnie dziecko umieszczane jest w nowej linii, wysokość nie została poprawnie obliczona. Poprawiłem trochę obliczenia (było dziwne użycie „wysokości” w porównaniu z currentHeight).

Następująca zmiana rozwiązuje problem „ostatnie dziecko jest obcięte, jeśli znajduje się w nowej linii”:

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
    int widthLimit = MeasureSpec.getSize(widthMeasureSpec) - getPaddingRight();
    int widthMode = MeasureSpec.getMode(widthMeasureSpec);

    boolean growHeight = widthMode != MeasureSpec.UNSPECIFIED;

    int width = 0;

    int currentWidth = getPaddingLeft();
    int currentHeight = getPaddingTop();

    int maxChildHeight = 0;

    boolean breakLine = false;
    boolean newLine = false;
    int spacing = 0;

    final int count = getChildCount();
    for (int i = 0; i < count; i++)
    {
        View child = getChildAt(i);
        measureChild(child, widthMeasureSpec, heightMeasureSpec);

        LayoutParams lp = (LayoutParams) child.getLayoutParams();
        spacing = mHorizontalSpacing;

        if (lp.horizontalSpacing >= 0)
        {
            spacing = lp.horizontalSpacing;
        }

        if (growHeight && (breakLine || ((currentWidth + child.getMeasuredWidth()) > widthLimit)))
        {               
            newLine = true;
            currentHeight += maxChildHeight + mVerticalSpacing;

            width = Math.max(width, currentWidth - spacing);

            currentWidth = getPaddingLeft();
            maxChildHeight = 0;
        }
        else
        {
            newLine = false;
        }

        maxChildHeight = Math.max(maxChildHeight, child.getMeasuredHeight());

        lp.x = currentWidth;
        lp.y = currentHeight;

        currentWidth += child.getMeasuredWidth() + spacing;

        breakLine = lp.breakLine;
    }

    if (newLine == false)
    {
        width = Math.max(width, currentWidth - spacing);
    }

    width += getPaddingRight();
    int height = currentHeight + maxChildHeight + getPaddingBottom();

    setMeasuredDimension(resolveSize(width, widthMeasureSpec),
            resolveSize(height, heightMeasureSpec));
}

Istnieje biblioteka Google o nazwie „flexbox-layout” . Powinieneś to sprawdzić.

Aby użyć go w RecyclerView, możesz użyć czegoś takiego:

val layoutManager = FlexboxLayoutManager(activity)
layoutManager.flexDirection = FlexDirection.ROW
layoutManager.flexWrap = FlexWrap.WRAP
layoutManager.justifyContent = JustifyContent.FLEX_START
layoutManager.alignItems = AlignItems.FLEX_START 
recyclerView.layoutManager=layoutManager

Podobnie jak jedna z poprzednich odpowiedzi, zacząłem od rozwiązania tutaj: http://hzqtc.github.io/2013/12/android-custom-layout-flowlayout.html

Rozszerzyłem go, aby uwzględnić różne wzrosty dzieci, jak poniżej.

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;

// Custom layout that wraps child views to a new line
public class FlowLayout extends ViewGroup {

    private int marginHorizontal;
    private int marginVertical;

    public FlowLayout(Context context) {
        super(context);
        init();
    }

    public FlowLayout(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public FlowLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    private void init() { // Specify the margins for the children
        marginHorizontal = getResources().getDimensionPixelSize(R.dimen.activity_half_horizontal_margin);
        marginVertical = getResources().getDimensionPixelSize(R.dimen.activity_half_vertical_margin);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int childLeft = getPaddingLeft();
        int childTop = getPaddingTop();
        int lowestBottom = 0;
        int lineHeight = 0;
        int myWidth = resolveSize(100, widthMeasureSpec);
        int wantedHeight = 0;

        for (int i = 0; i < getChildCount(); i++) {
            final View child = getChildAt(i);
            if (child.getVisibility() == View.GONE) {
                continue;
            }

            child.measure(getChildMeasureSpec(widthMeasureSpec, 0, child.getLayoutParams().width),
                    getChildMeasureSpec(heightMeasureSpec, 0, child.getLayoutParams().height));
            int childWidth = child.getMeasuredWidth();
            int childHeight = child.getMeasuredHeight();
            lineHeight = Math.max(childHeight, lineHeight);

            if (childWidth + childLeft + getPaddingRight() > myWidth) { // Wrap this line
                childLeft = getPaddingLeft();
                childTop = marginVertical + lowestBottom; // Spaced below the previous lowest point
                lineHeight = childHeight;
            }
            childLeft += childWidth + marginHorizontal;

            if (childHeight + childTop > lowestBottom) { // New lowest point
                lowestBottom = childHeight + childTop;
            }
        }

        wantedHeight += childTop + lineHeight + getPaddingBottom();
        setMeasuredDimension(myWidth, resolveSize(wantedHeight, heightMeasureSpec));
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        int childLeft = getPaddingLeft();
        int childTop = getPaddingTop();
        int lowestBottom = 0;
        int myWidth = right - left;
        for (int i = 0; i < getChildCount(); i++) {
            final View child = getChildAt(i);
            if (child.getVisibility() == View.GONE) {
                continue;
            }
            int childWidth = child.getMeasuredWidth();
            int childHeight = child.getMeasuredHeight();

            if (childWidth + childLeft + getPaddingRight() > myWidth) { // Wrap this line
                childLeft = getPaddingLeft();
                childTop = marginVertical + lowestBottom; // Spaced below the previous lowest point
            }
            child.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);
            childLeft += childWidth + marginHorizontal;

            if (childHeight + childTop > lowestBottom) { // New lowest point
                lowestBottom = childHeight + childTop;
            }
        }
    }
}

Użyłem tego jako rozwiązania do zawijania wielu wierszy TextEdits. Mam nadzieję, że to pomoże!

Oto klasa niestandardowa, w której można uzyskać układ, taki jak następujący, dodając dynamiczny widok (zwany również FlowLayout).

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;

/*
Created By Dhavalkumar Solanki
* */
public class FlowLayout extends ViewGroup {

    private int line_height_space;

    public static class LayoutParams extends ViewGroup.LayoutParams {

        public int horizontal_spacing;
        public int vertical_spacing;

        /**
         * @param horizontal_spacing Pixels between items, horizontally
         * @param vertical_spacing   Pixels between items, vertically
         */
        public LayoutParams(int horizontal_spacing, int vertical_spacing) {
            super(0, 0);
            this.horizontal_spacing = horizontal_spacing;
            this.vertical_spacing = vertical_spacing;
        }
    }

    public FlowLayout(Context context) {
        super(context);
    }

    public FlowLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        assert (MeasureSpec.getMode(widthMeasureSpec) != MeasureSpec.UNSPECIFIED);

        final int width = MeasureSpec.getSize(widthMeasureSpec) - getPaddingLeft() - getPaddingRight();
        int height = MeasureSpec.getSize(heightMeasureSpec) - getPaddingTop() - getPaddingBottom();
        final int count = getChildCount();
        int line_height_space = 0;

        int xpos = getPaddingLeft();
        int ypos = getPaddingTop();

        int childHeightMeasureSpec;
        if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST) {
            childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.AT_MOST);
        } else {
            childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
        }


        for (int i = 0; i < count; i++) {
            final View child = getChildAt(i);
            if (child.getVisibility() != GONE) {
                final LayoutParams lp = (LayoutParams) child.getLayoutParams();
                child.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.AT_MOST), childHeightMeasureSpec);
                final int childw = child.getMeasuredWidth();
                line_height_space = Math.max(line_height_space, child.getMeasuredHeight() + lp.vertical_spacing);

                if (xpos + childw > width) {
                    xpos = getPaddingLeft();
                    ypos += line_height_space;
                }

                xpos += childw + lp.horizontal_spacing;
            }
        }
        this.line_height_space = line_height_space;

        if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.UNSPECIFIED) {
            height = ypos + line_height_space;

        } else if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST) {
            if (ypos + line_height_space < height) {
                height = ypos + line_height_space;
            }
        }
        setMeasuredDimension(width, height);
    }

    @Override
    protected ViewGroup.LayoutParams generateDefaultLayoutParams() {
        return new LayoutParams(1, 1); // default of 1px spacing
    }

    @Override
    protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
        if (p instanceof LayoutParams) {
            return true;
        }
        return false;
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        final int count = getChildCount();
        final int width = r - l;
        int xpos = getPaddingLeft();
        int ypos = getPaddingTop();

        for (int i = 0; i < count; i++) {
            final View child = getChildAt(i);
            if (child.getVisibility() != GONE) {
                final int childw = child.getMeasuredWidth();
                final int childh = child.getMeasuredHeight();
                final LayoutParams lp = (LayoutParams) child.getLayoutParams();
                if (xpos + childw > width) {
                    xpos = getPaddingLeft();
                    ypos += line_height_space;
                }
                child.layout(xpos, ypos, xpos + childw, ypos + childh);
                xpos += childw + lp.horizontal_spacing;
            }
        }
    }
}

Przykład:

text_view.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tool="http://schemas.android.com/tools"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="5dp">

    <TextView
        android:id="@+id/tvText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="19sp"
        android:background="@drawable/unselected_tag"
        android:textColor="@color/colorPrimary"
        tool:text="Temp" />
</RelativeLayout>

activity_flow_layou_demo.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"

    >
    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">

                <TextView
                    android:id="@+id/tvTitleBusiness"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="Business Interest "
                    android:textColor="@color/colorPrimary"
                    android:textSize="25sp" />

                <com.example.tristateandroid2.radardemo.FlowLayout
                    android:id="@+id/flowBusiness"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">

                </com.example.tristateandroid2.radardemo.FlowLayout>
            </LinearLayout>

            <LinearLayout
                android:layout_marginTop="@dimen/activity_horizontal_margin"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">

                <TextView
                    android:id="@+id/tvTitlePrivate"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="Private Interest "
                    android:textColor="@color/colorPrimary"
                    android:textSize="25sp" />

                <com.example.tristateandroid2.radardemo.FlowLayout
                    android:id="@+id/flowPrivate"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">

                </com.example.tristateandroid2.radardemo.FlowLayout>
            </LinearLayout>
        </LinearLayout>
    </ScrollView>
</RelativeLayout>

FlowLayouDemo.java

import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.util.ArrayList;

public class FlowLayouDemo extends AppCompatActivity {
    private TextView tvTitleBusiness;
    private FlowLayout flowBusiness;
    private TextView tvTitlePrivate;
    private FlowLayout flowPrivate;
    private ArrayList<TagModel> arrayList;

    private void findViews() {
        tvTitleBusiness = (TextView) findViewById(R.id.tvTitleBusiness);
        flowBusiness = (FlowLayout) findViewById(R.id.flowBusiness);
        tvTitlePrivate = (TextView) findViewById(R.id.tvTitlePrivate);
        flowPrivate = (FlowLayout) findViewById(R.id.flowPrivate);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_flow_layou_demo);
        findViews();
        addLayouts();
    }

    private void addLayouts() {
        if (arrayList == null) {
            arrayList = new ArrayList<>();
        }
        flowBusiness.removeAllViews();
        flowPrivate.removeAllViews();
        for (int i = 0; i < 75; i++) {

            final boolean[] selected = {false};
            View view = this.getLayoutInflater().inflate(R.layout.text_view, null);
            final TextView textView = (TextView) view.findViewById(R.id.tvText);
            if (i % 5 == 0) {
                arrayList.add(new TagModel(i, false, "Business VIEW : " + i));
                textView.setText("Busi VIEW To  IS : " + i);
            } else {
                arrayList.add(new TagModel(i, false, "TEXT IS : " + i));
                textView.setText("Busi IS : " + i);
            }
            textView.setBackgroundResource(R.drawable.unselected_tag);
            textView.setTextColor(Color.parseColor("#3F51B5"));
            textView.setTag(i);
            if(i<=50){
                flowBusiness.addView(view);
            }else {
                textView.setText("Priv View : "+i);
                flowPrivate.addView(view);
            }

            textView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    if (selected[0]) {
                        selected[0] = false;
                        textView.setBackgroundResource(R.drawable.unselected_tag);
                        textView.setTextColor(Color.parseColor("#3F51B5"));
                    } else {
                        selected[0] = true;
                        textView.setBackgroundResource(R.drawable.selected_tag);
                        textView.setTextColor(Color.parseColor("#FFFFFF"));
                    }
                }
            });

        }
    }
}

Wersja @MattNotEquals () FlowLayout, która obsługuje MarginLayoutParams.

To tylko minimalistyczna implementacja MarginLayoutParms do obsługi marginesów lewy, prawy, górny i dolny.

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;

/**
 *  Original version courtesy of MattNotEquals() at http://stackoverflow.com/a/34169798/4515489 - 4/13/17.
 *  7/15/17 Revised to support MarginLayoutParams.
 */
public class FlowLayout extends ViewGroup {
    // Custom layout that wraps child views to a new line.

    public FlowLayout(Context context) {
        super(context);
    }

    public FlowLayout(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public FlowLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int childLeft = getPaddingLeft();
        int childTop = getPaddingTop();
        int lowestBottom = 0;
        int lineHeight = 0;
        int myWidth = resolveSize(100, widthMeasureSpec);
        int wantedHeight = 0;
        for (int i = 0; i < getChildCount(); i++) {
            final View child = getChildAt(i);
            if (child.getVisibility() == View.GONE) {
                continue;
            }
            child.measure(getChildMeasureSpec(widthMeasureSpec, 0, child.getLayoutParams().width),
                          getChildMeasureSpec(heightMeasureSpec, 0, child.getLayoutParams().height));
            int childWidth = child.getMeasuredWidth();
            int childHeight = child.getMeasuredHeight();
            lineHeight = Math.max(childHeight, lineHeight);

            final LayoutParams lp = (LayoutParams) child.getLayoutParams();
            childLeft += lp.leftMargin;
            childTop += lp.topMargin;
            if (childLeft + childWidth + lp.rightMargin + getPaddingRight() > myWidth) { // Wrap this line
                childLeft = getPaddingLeft() + lp.leftMargin;
                childTop = lowestBottom + lp.topMargin; // Spaced below the previous lowest point
                lineHeight = childHeight;
            }
            childLeft += childWidth + lp.rightMargin;

            if (childTop + childHeight + lp.bottomMargin > lowestBottom) { // New lowest point
                lowestBottom = childTop + childHeight + lp.bottomMargin;
            }
        }
        wantedHeight += lowestBottom + getPaddingBottom(); // childTop + lineHeight + getPaddingBottom();
        setMeasuredDimension(myWidth, resolveSize(wantedHeight, heightMeasureSpec));
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        int childLeft = getPaddingLeft();
        int childTop = getPaddingTop();
        int lowestBottom = 0;
        int myWidth = right - left;
        for (int i = 0; i < getChildCount(); i++) {
            final View child = getChildAt(i);
            if (child.getVisibility() == View.GONE) {
                continue;
            }
            int childWidth = child.getMeasuredWidth();
            int childHeight = child.getMeasuredHeight();

            final LayoutParams lp = (LayoutParams) child.getLayoutParams();
            childLeft += lp.leftMargin;
            childTop += lp.topMargin;
            if (childLeft + childWidth + lp.rightMargin + getPaddingRight() > myWidth) { // Wrap this line
                childLeft = getPaddingLeft() + lp.leftMargin;
                childTop = lowestBottom + lp.topMargin; // Spaced below the previous lowest point
            }
            child.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);
            childLeft += childWidth + lp.rightMargin;

            if (childTop + childHeight + lp.bottomMargin > lowestBottom) { // New lowest point
                lowestBottom = childTop + childHeight + lp.bottomMargin;
            }
        }
    }

    @Override
    public boolean shouldDelayChildPressedState() {
        return false;
    }

    @Override
    protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
        return p instanceof LayoutParams;
    }

    @Override
    protected LayoutParams generateDefaultLayoutParams() {
        return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    }

    @Override
    public LayoutParams generateLayoutParams(AttributeSet attrs) {
        return new FlowLayout.LayoutParams(getContext(), attrs);
    }

    @Override
    protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams lp) {
        if (lp instanceof LayoutParams) {
            return new LayoutParams((LayoutParams) lp);
        }
        else if (lp instanceof MarginLayoutParams) {
            return new LayoutParams((MarginLayoutParams) lp);
        }
        else
            return super.generateLayoutParams(lp);
    }

    /**
     * Per-child layout information for layouts that support margins.
     */
    public static class LayoutParams extends MarginLayoutParams {
        public LayoutParams(@NonNull Context c, @Nullable AttributeSet attrs) {
            super(c, attrs);
        }
        public LayoutParams(int width, int height) {
            super(width, height);
        }
        public LayoutParams(@NonNull ViewGroup.LayoutParams source) {
            super(source);
        }
        public LayoutParams(@NonNull ViewGroup.MarginLayoutParams source) {
            super(source);
        }
        public LayoutParams(@NonNull LayoutParams source) {
            super(source);
        }
    }
}

Ładny, prosty, samodzielny kod FlowLayout tutaj (tylko kilka zwięzłych plików gist.github) :

http://hzqtc.github.io/2013/12/android-custom-layout-flowlayout.html

Jednak aktywność po wyjęciu z pudełka nie pomogła mi załadować niestandardowego układu.

Znalazłem to obejście [używając wywołania 2-param .inflate () z tego przykładu ] :

@Override
protected void onCreate(Bundle savedInstanceState)
{
    // ..

    setContentView(R.layout.main_res_layout_activity_main);

    ViewGroup flowContainer = getFlowLayoutView(); 

    // ..
}

ViewGroup getFlowLayoutView()
{
    LayoutInflater inflater = getLayoutInflater();

    ViewGroup flowLayout = 
        (ViewGroup)
            inflater.inflate(
                    R.layout.main_res_layout_activity_main,
                    (FlowLayout) findViewById(R.id.flow_container)
            );

    return flowLayout;
}

W ConstraintLayout jest teraz wbudowana obsługa za pomocą widżetu Flow. Ma wiele opcji, które można wykorzystać do osiągnięcia wielu rodzajów przepływów.

Przykład:

<androidx.constraintlayout.widget.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="match_parent">

<androidx.constraintlayout.helper.widget.Flow
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    app:constraint_referenced_ids="item_1,item_2,item_3"
    app:flow_horizontalBias="0"
    app:flow_horizontalGap="10dp"
    app:flow_horizontalStyle="packed"
    app:flow_verticalGap="8dp"
    app:flow_wrapMode="aligned"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<View
    android:id="@+id/item_1"
    android:layout_width="50dp"
    android:layout_height="50dp" />

<View
    android:id="@+id/item_2"
    android:layout_width="50dp"
    android:layout_height="50dp" />

<View
    android:id="@+id/item_3"
    android:layout_width="50dp"
    android:layout_height="50dp" />
</androidx.constraintlayout.widget.ConstraintLayout>

Spójrz na ten post: https://medium.com/@tapanrgohil/constraintlayout-flow-bye-bye-to-linerlayout-78fd7fa9b679

A tutaj: https://www.bignerdranch.com/blog/constraintlayout-flow-simple-grid-building-without-nested-layouts/