《Android自定义控件》讨论组圆形头像堆叠、叠加控件DiscussionAvatarView，显示多个参与讨论的人的头像

转载请标明出处：https://blog.csdn.net/m0_38074457/article/details/86589825

一、效果图

 二、实现步骤

三、代码实现

1、attrs.xml中添加自定义控件的属性

2、控件代码

1、构造方法中初始化

   private void initView(Context context, AttributeSet attrs) {
        this.mContext = context;
        this.mInflater = LayoutInflater.from(mContext);
        TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.DiscussionAvatarView);
        if (array != null) {
            int radius = array.getInteger(R.styleable.DiscussionAvatarView_radius, 13);
            mSpace = array.getFloat(R.styleable.DiscussionAvatarView_space, (float) 0.5);
            mMaxCount = array.getInteger(R.styleable.DiscussionAvatarView_maxCount, 6);
            isLastComplete = array.getBoolean(R.styleable.DiscussionAvatarView_isLastComplete, true);
            isShowAnimation = array.getBoolean(R.styleable.DiscussionAvatarView_isShowAnimation, true);

            mRadius = DensityUtil.dip2px(context, radius);

            array.recycle();
        }
    }

2、onMeasure中设置控件的宽高

 @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int heiMeasure = MeasureSpec.getSize(heightMeasureSpec);
        int heiMode = MeasureSpec.getMode(heightMeasureSpec);
        int widMode = MeasureSpec.getMode(widthMeasureSpec);
        int widMeasure = MeasureSpec.getSize(heightMeasureSpec);

        int wid = 0;
        int hei = 0;
        int count = getChildCount();
        for (int i = 0; i < count; i++) {
            View child = getChildAt(i);
            ViewGroup.LayoutParams lp = child.getLayoutParams();
            lp.width = 2 * mRadius;
            lp.height = lp.width;
            child.setLayoutParams(lp);
            // 测量子View的宽和高,系统提供的measureChild
            measureChild(child, widthMeasureSpec, heightMeasureSpec);
            // 子View占据的宽度
            int childWidth = child.getMeasuredWidth();
            // 子View占据的高度
            int childHeight = child.getMeasuredHeight();

            if (i < mMaxCount) {
                if (i == 0) {
                    wid = wid + childWidth;
                } else {
                    wid = (int) (wid + childWidth * mSpace);
                }
            }
            hei = Math.max(hei, childHeight);
        }
        //如果是exactly使用测量宽和高，否则使用自己设置的宽和高
        setMeasuredDimension((widMode == MeasureSpec.EXACTLY) ? widMeasure : wid,
                (heiMode == MeasureSpec.EXACTLY) ? heiMeasure : hei);
    }

3、onLayout对头像排版

@Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        int count = getChildCount();

        int left = -mCurrentOffset;
        int top = 0;
        int right = -mCurrentOffset;
        for (int i = 0; i < count; i++) {
            View child;
            if (isLastComplete) {
                child = getChildAt(i);
            } else {
                child = getChildAt(count - i - 1);
            }
            int childWidth = child.getMeasuredWidth();
            int childHeight = child.getMeasuredHeight();

            if (i == 0) {
                right = right + childWidth;
            } else {
                right = (int) (right + childWidth * mSpace);
            }
            child.layout(left, top, right, childHeight);
            left = (int) (left + childWidth * mSpace);
        }
    }

三、项目中如何引用

步骤1.将JitPack存储库添加到构建文件中

项目的根build.gradle中添加以下代码：

allprojects {
	repositories {
		...
		maven { url 'https://jitpack.io' }
	}
}

步骤2.build.gradle添加依赖项

dependencies {
    implementation 'com.github.hnsycsxhzcsh:DiscussionAvatarView:v1.3'
}

 步骤3. 布局中引用控件

步骤4. initDatas初始化数据（也可以直接addData），新增头像使用addData方法，DiscussionAvatarListener(可以不加)为动画效果的监听

备注：

可以在github上下载我的项目：https://github.com/hnsycsxhzcsh/DiscussionAvatarView，如果我的博客对你有帮助的话，欢迎博客点赞支持，并在github右上角star支持！