Android如何自定义ViewGroup实现堆叠头像的点赞Layout
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实现
自定义属性
属性名 | 说明 | 默认值 |
---|---|---|
vertivalSpace | 行距 | 4dp |
pileWidth | 重叠宽度 | 10dp |
onMeasure方法,每行的宽度不再是child的宽度和了,而是要减掉重叠部分的宽度和
@Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec); int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec); int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec); int heightSpecSize = MeasureSpec.getSize(heightMeasureSpec); //AT_MOST int width = 0; int height = 0; int rawWidth = 0;//当前行总宽度 int rawHeight = 0;// 当前行高 int rowIndex = 0;//当前行位置 int count = getChildCount(); for (int i = 0; i < count; i++) { View child = getChildAt(i); if(child.getVisibility() == GONE){ if(i == count - 1){ //最后一个child height += rawHeight; width = Math.max(width, rawWidth); } continue; } //这里调用measureChildWithMargins 而不是measureChild measureChildWithMargins(child, widthMeasureSpec, 0, heightMeasureSpec, 0); MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); int childWidth = child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin; int childHeight = child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin; if(rawWidth + childWidth - (rowIndex > 0 ? pileWidth : 0)> widthSpecSize - getPaddingLeft() - getPaddingRight()){ //换行 width = Math.max(width, rawWidth); rawWidth = childWidth; height += rawHeight + vertivalSpace; rawHeight = childHeight; rowIndex = 0; } else { rawWidth += childWidth; if(rowIndex > 0){ rawWidth -= pileWidth; } rawHeight = Math.max(rawHeight, childHeight); } if(i == count - 1){ width = Math.max(rawWidth, width); height += rawHeight; } rowIndex++; } setMeasuredDimension( widthSpecMode == MeasureSpec.EXACTLY ? widthSpecSize : width + getPaddingLeft() + getPaddingRight(), heightSpecMode == MeasureSpec.EXACTLY ? heightSpecSize : height + getPaddingTop() + getPaddingBottom() ); }
onLayout 每一行,第一个正常放,之后的重叠放
@Override protected void onLayout(boolean changed, int l, int t, int r, int b) { int viewWidth = r - l; int leftOffset = getPaddingLeft(); int topOffset = getPaddingTop(); int rowMaxHeight = 0; int rowIndex = 0;//当前行位置 View childView; for( int w = 0, count = getChildCount(); w < count; w++ ){ childView = getChildAt(w); if(childView.getVisibility() == GONE) continue; MarginLayoutParams lp = (MarginLayoutParams) childView.getLayoutParams(); // 如果加上当前子View的宽度后超过了ViewGroup的宽度,就换行 int occupyWidth = lp.leftMargin + childView.getMeasuredWidth() + lp.rightMargin; if(leftOffset + occupyWidth + getPaddingRight() > viewWidth){ leftOffset = getPaddingLeft(); // 回到最左边 topOffset += rowMaxHeight + vertivalSpace; // 换行 rowMaxHeight = 0; rowIndex = 0; } int left = leftOffset + lp.leftMargin; int top = topOffset + lp.topMargin; int right = leftOffset+ lp.leftMargin + childView.getMeasuredWidth(); int bottom = topOffset + lp.topMargin + childView.getMeasuredHeight(); childView.layout(left, top, right, bottom); // 横向偏移 leftOffset += occupyWidth; // 试图更新本行最高View的高度 int occupyHeight = lp.topMargin + childView.getMeasuredHeight() + lp.bottomMargin; if(rowIndex != count - 1){ leftOffset -= pileWidth;//这里控制重叠位置 } rowMaxHeight = Math.max(rowMaxHeight, occupyHeight); rowIndex++; } }
效果图
因为这个一般只会显示一行,所以暂时没有通过setAdapter方式去设置数据源。
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