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<String> 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<String> 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 ? 1 : 0);// 行数  for (int rowCursor = 0; rowCursor < rowCount; rowCursor++) {  LinearLayout rowLayout = new LinearLayout(getContext());  rowLayout.setOrientation(LinearLayout.HORIZONTAL);  rowLayout.setLayoutParams(rowPara);  if (rowCursor != 0) {   rowLayout.setPadding(0, pxImagePadding, 0, 0);  }  int columnCount = allCount % MAX_PER_ROW_COUNT == 0 ? MAX_PER_ROW_COUNT   : allCount % MAX_PER_ROW_COUNT;//每行的列数  if (rowCursor != rowCount - 1) {   columnCount = MAX_PER_ROW_COUNT;  }  addView(rowLayout);  int rowOffset = rowCursor * MAX_PER_ROW_COUNT;// 行偏移  for (int columnCursor = 0; columnCursor < columnCount; columnCursor++) {   int position = columnCursor + rowOffset;   rowLayout.addView(createImageView(position, true));  }  } } } private ImageView createImageView(final int position, final boolean isMultiImage) { String url = ""; if (!TextUtils.isEmpty(imagesList.get(position))) {  url = imagesList.get(position); } ImageView imageView = new ColorFilterImageView(getContext()); if (isMultiImage) {  imageView.setScaleType(ScaleType.CENTER_CROP);  imageView.setLayoutParams(position % MAX_PER_ROW_COUNT == 0 ? moreParaColumnFirst : morePara); } else {  imageView.setAdjustViewBounds(true);  imageView.setScaleType(ScaleType.FIT_START);  imageView.setMaxHeight(pxOneMaxWandH);  imageView.setLayoutParams(onePicPara); } imageView.setId(url.hashCode()); imageView.setOnClickListener(new OnClickListener() {  @Override  public void onClick(View v) {  if (mOnItemClickListener != null) {   mOnItemClickListener.onItemClick(v, position);  }  } }); // 加载网络图片/设置图片显示 Glide.with(getContext()).load(url).into(imageView); return imageView; } public interface OnItemClickListener { void onItemClick(View view, int position); }}

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; }}

<com.lvfq.myworkingtest.dynamic.view.MultiImageView android:id="@+id/multi_image" android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="@dimen/dp_10" />MultiImageView multiImageView = findViewById(R.id.multi_image);multiImageView.setList(imgs); // List<String> 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.   }  });