How can I do something like a FlowLayout in Android?

Question

How can I do something like a FlowLayout in Android?

Answer 1

Here is the custom class where you can achive layout like following with adding dynamicaly view (Also called 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;
            }
        }
    }
}

Example :

text_view.xml

activity_flow_layou_demo.xml

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 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"));
                    }
                }
            });

        }
    }
}