###需求

• 當只有一張的時候,顯示一張圖片(寬度是整個手機寬度(去掉左右margin和padding值))
• 當有兩張和四張圖片的時候,圖片的寬度是整個寬度的1/2,當然要剔除margin和padding值
• 當圖片是3,5,6,7,8,9張的時候,顯示的是類似于微信九宮格的圖片

###主要的測量方法

@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);int width = MeasureSpec.getSize(widthMeasureSpec);int height = 0;int totalWidth = width - getPaddingLeft() - getPaddingRight();if (mImageInfo != null && mImageInfo.size() > 0) {if (mImageInfo.size() == 1) {gridWidth = singleImageSize > totalWidth ? totalWidth : singleImageSize;gridHeight = (int) (gridWidth / singleImageRatio);//矯正圖片顯示區(qū)域大小，不允許超過最大顯示范圍if (gridHeight > singleImageSize) {float ratio = singleImageSize * 1.0f / gridHeight;gridWidth = (int) (gridWidth * ratio);gridHeight = singleImageSize;}} else if (mImageInfo.size() == 2 || mImageInfo.size() == 4) {//如果當為2張或者4張圖片的時候 就按照總寬度的 1/2gridWidth = gridHeight = (totalWidth - gridSpacing * (columnCount - 1)) / columnCount;//這里無論是幾張圖片，寬高都按總寬度的 1/3 // gridWidth = gridHeight = (totalWidth - gridSpacing ) / 2;} else {gridWidth = gridHeight = (totalWidth - gridSpacing * 2) / 3;}width = gridWidth * columnCount + gridSpacing * (columnCount - 1) + getPaddingLeft() + getPaddingRight();height = gridHeight * rowCount + gridSpacing * (rowCount - 1) + getPaddingTop() + getPaddingBottom();}setMeasuredDimension(width, height);} 復制代碼

###效果圖

###項目地址 https://github.com/wuyinlei/NineImageForCircleFriends

###參考

https://github.com/jeasonlzy/NineGridView

總結

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