Android实现朋友圈多图显示功能

public class MultiImageView extends LinearLayout {
 public static int MAX_WIDTH = 0;

 // 照片的Url列表
 private List imagesList;

 /**
 * 长度 单位为Pixel *
 */
 private int pxOneMaxWandH; // 单张图最大允许宽高
 private int pxMoreWandH = 0;// 多张图的宽高
 private int pxImagePadding = LvDPUtil.dip2px(3);// 图片间的间距

 private int MAX_PER_ROW_COUNT = 3;// 每行显示最大数

 private LayoutParams onePicPara;
 private LayoutParams morePara, moreParaColumnFirst;
 private LayoutParams rowPara;

 private OnItemClickListener mOnItemClickListener;

 public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
 mOnItemClickListener= onItemClickListener;
 }

 public MultiImageView(Context context) {
 super(context);
 }

 public MultiImageView(Context context, AttributeSet attrs) {
 super(context, attrs);
 }

 public void setList(List lists) throws IllegalArgumentException {
 if (lists == null) {
  throw new IllegalArgumentException("imageList is null...");
 }
 imagesList = lists;

 if (MAX_WIDTH > 0) {
  // 如果需要两张和四张图横向铺满，这里去掉注释即可。
//  if (lists.size() == 2 || lists.size() == 4) {
//  pxMoreWandH = (MAX_WIDTH - pxImagePadding) / 2;
//  } else {
  pxMoreWandH = (MAX_WIDTH - pxImagePadding * 2) / 3; //解决右侧图片和内容对不齐问题
//  }
  pxOneMaxWandH= MAX_WIDTH * 2 / 3; // 一张图的时候，图片宽度
  initImageLayoutParams();
 }

 initView();
 }

 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 if (MAX_WIDTH == 0) {
  int width = measureWidth(widthMeasureSpec);
  if (width > 0) {
  MAX_WIDTH = width - getPaddingLeft() - getPaddingRight();
  if (imagesList != null && imagesList.size() > 0) {
   setList(imagesList);
  }
  }
 }
 super.onMeasure(widthMeasureSpec, heightMeasureSpec);
 }

 /**
 * Determines the width of this view
 *
 * @param measureSpec A measureSpec packed into an int
 * @return The width of the view, honoring constraints from measureSpec
 */
 private int measureWidth(int measureSpec) {
 int result = 0;
 int specMode = MeasureSpec.getMode(measureSpec);
 int specSize = MeasureSpec.getSize(measureSpec);

 if (specMode == MeasureSpec.EXACTLY) {
  // We were told how big to be
  result = specSize;
 } else {
  // Measure the text
  // result = (int) mTextPaint.measureText(mText) + getPaddingLeft()
  // + getPaddingRight();
  if (specMode == MeasureSpec.AT_MOST) {
  // Respect AT_MOST value if that was what is called for by
  // measureSpec
  result = Math.min(result, specSize);
  }
 }
 return result;
 }

 private void initImageLayoutParams() {
 int wrap = LayoutParams.WRAP_CONTENT;
 int match = LayoutParams.MATCH_PARENT;

 OnePicPara= new LayoutParams(pxOneMaxWandH, wrap);

 moreParaColumnFirst = new LayoutParams(pxMoreWandH, pxMoreWandH);
 morePara = new LayoutParams(pxMoreWandH, pxMoreWandH);
 morePara.setMargins(pxImagePadding, 0, 0, 0);

 rowPara = new LayoutParams(match, wrap);
 }

 // 根据imageView的数量初始化不同的View布局,还要为每一个View作点击效果
 private void initView() {
 this.setOrientation(VERTICAL);
 this.removeAllViews();
 if (MAX_WIDTH == 0) {
  //为了触发onMeasure()来测量MultiImageView的最大宽度，MultiImageView的宽设置为match_parent
  addView(new View(getContext()));
  return;
 }

 if (imagesList == null || imagesList.size() == 0) {
  return;
 }

 if (imagesList.size() == 1) {
  addView(createImageView(0, false));
 } else {
  int allCount = imagesList.size();
  if (allCount == 4) {
  MAX_PER_ROW_COUNT = 2;
  } else {
  MAX_PER_ROW_COUNT = 3;
  }
  int rowCount = allCount / MAX_PER_ROW_COUNT
   + (allCount % MAX_PER_ROW_COUNT > 0 &＃63; 1 : 0);// 行数
  for (int rowCursor = 0; rowCursor 

public class ColorFilterImageView extends ImageView implements OnTouchListener {
 public ColorFilterImageView(Context context) {
 this(context, null, 0);
 }

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

 public ColorFilterImageView(Context context, AttributeSet attrs, int defStyle) {
 super(context, attrs, defStyle);
 init();
 }

 private void init() {
 setOnTouchListener(this);
 }

 @Override
 public boolean onTouch(View v, MotionEvent event) {
 switch (event.getAction()) {
  case MotionEvent.ACTION_DOWN: // 按下时图像变灰
  setColorFilter(Color.GRAY, Mode.MULTIPLY);
  break;
  case MotionEvent.ACTION_UP: // 手指离开或取消操作时恢复原色
  case MotionEvent.ACTION_CANCEL:
  setColorFilter(Color.TRANSPARENT);
  break;
  default:
  break;
 }
 return false;
 }
}

MultiImageView multiImageView = findViewById(R.id.multi_image);
multiImageView.setList(imgs); // List 类型的图片地址列表
multiImage.setOnItemClickListener(new MultiImageView.OnItemClickListener() {
   @Override
   public void onItemClick(View view, int position) {
   // To do something or 查看大图.
   }
  });