Android/XixunPlayer/app/src/main/java/com/xixun/xixunplayer/AbsLayout.java

package com.xixun.xixunplayer;

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

public class AbsLayout extends ViewGroup {

    public AbsLayout(Context context) {
        this(context, null);
    }

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

    public AbsLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        this(context, attrs, defStyleAttr, 0);
    }

    public AbsLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int count = getChildCount();
        int maxHeight = 0;
        int maxWidth = 0;
        measureChildren(widthMeasureSpec, heightMeasureSpec);
        for(int i = 0; i < count; i++) {
            View child = getChildAt(i);
            if(child.getVisibility() != GONE) {
                int childRight;
                int childBottom;
                var lp = (LayoutParams) child.getLayoutParams();
                childRight = lp.x + child.getMeasuredWidth();
                childBottom = lp.y + child.getMeasuredHeight();
                maxWidth = Math.max(maxWidth, childRight);
                maxHeight = Math.max(maxHeight, childBottom);
            }
        }
        maxWidth += getPaddingLeft() + getPaddingRight();
        maxHeight += getPaddingTop() + getPaddingBottom();
        maxHeight = Math.max(maxHeight, getSuggestedMinimumHeight());
        maxWidth = Math.max(maxWidth, getSuggestedMinimumWidth());
        setMeasuredDimension(resolveSizeAndState(maxWidth, widthMeasureSpec, 0), resolveSizeAndState(maxHeight, heightMeasureSpec, 0));
    }

    @Override
    protected ViewGroup.LayoutParams generateDefaultLayoutParams() {
        return new LayoutParams(0, 0, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        int count = getChildCount();
        for (int i = 0; i < count; i++) {
            View child = getChildAt(i);
            if(child.getVisibility() != GONE) {
                var lp = (LayoutParams) child.getLayoutParams();
                int childLeft = getPaddingLeft() + lp.x;
                int childTop = getPaddingTop() + lp.y;
                child.layout(childLeft, childTop, childLeft + child.getMeasuredWidth(), childTop + child.getMeasuredHeight());
            }
        }
    }

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

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

    @Override
    protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
        return new LayoutParams(p);
    }

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

    public static class LayoutParams extends ViewGroup.LayoutParams {

        public int x;
        public int y;

        public LayoutParams(int x, int y, int width, int height) {
            super(width, height);
            this.x = x;
            this.y = y;
        }
        public LayoutParams(Context c, AttributeSet attrs) {
            super(c, attrs);
        }
        public LayoutParams(ViewGroup.LayoutParams source) {
            super(source);
        }
    }
}