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.
   }
  });