public static class LayoutParams extends ViewGroup.LayoutParams {
  public int left = 0;
  public int top = 0;
  public int right = 0;
  public int bottom = 0;

  public LayoutParams(Context arg0, AttributeSet arg1) {
  super(arg0, arg1);
  }

  public LayoutParams(int arg0, int arg1) {
  super(arg0, arg1);
  }

  public LayoutParams(android.view.ViewGroup.LayoutParams arg0) {
  super(arg0);
  }

 }

 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 int widthMode = MeasureSpec.getMode(widthMeasureSpec);
 int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
 measureChildren(widthMeasureSpec, heightMeasureSpec);

 int childCount = this.getChildCount();
 //宽布局为wrap_content时，childWidth取childView宽的最大值，否则动态计算
 if (widthMode == MeasureSpec.AT_MOST) {
  for (int i = 0; i < childCount; i++) {
  View child = this.getChildAt(i);
  childWidth = Math.max(childWidth, child.getMeasuredWidth());
  }
 } else if (widthMode == MeasureSpec.EXACTLY) {
  childWidth = (sizeWidth - (colums - 1) * hSpace) / colums;
 } 
 //自定义View的onMeasure、onLayout会执行两次，为了以后执行得到正确的结果
 clearTop();
 //遍历每个子view，将它们坐标保存在它们的LayoutParams中，为后面onLayout服务
 for (int i = 0; i < childCount; i++) {
  View child = this.getChildAt(i);
  childHeight = child.getMeasuredHeight() * childWidth / child.getMeasuredWidth();
  LayoutParams lParams = (LayoutParams) child.getLayoutParams();
  int minColum = getMinHeightColum();
  lParams.left = minColum * (childWidth + hSpace); 
  lParams.top = top[minColum];
  lParams.right = lParams.left + childWidth;  
  lParams.bottom = lParams.top + childHeight;
  top[minColum] += vSpace + childHeight;
 }
 //当宽为wrap_content时，计算出的viewGroup宽高
 int wrapWidth;
 int wrapHeight;
 if (childCount < colums) {
  wrapWidth = childCount * childWidth + (childCount - 1) * hSpace;
 } else {
  wrapWidth = colums * childWidth + (colums - 1) * hSpace;
 }
 wrapHeight = getMaxHeight();

 setMeasuredDimension(widthMode == MeasureSpec.AT_MOST? wrapWidth:sizeWidth, wrapHeight);
 }

 @Override
 protected void onLayout(boolean changed, int l, int t, int r, int b) {
 int childCount = this.getChildCount();
 for (int i = 0; i < childCount; i++) {
  View child = this.getChildAt(i);
  LayoutParams lParams = (LayoutParams) child.getLayoutParams();
  child.layout(lParams.left, lParams.top, lParams.right, lParams.bottom);
 }
 }

 //点击事件的回调接口
 public interface OnItemClickListener {
 void onItemClick(View v, int index);
 }

 public void setOnItemClickListener(final OnItemClickListener listener) {
 for (int i = 0; i < getChildCount(); i++) {
  final int index = i;
  View view = getChildAt(i);
  view.setOnClickListener(new OnClickListener() {
  @Override
  public void onClick(View v) {
   listener.onItemClick(v, index);
  }
  });
 }
 }

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res/com.hx.waterfalllayout"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:background="#303030"
 android:orientation="vertical" >

 <com.hx.waterfalllayout.WaterfallLayout
 android:id="@+id/gridview"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:background="#1e1d1d"
 app:hSpace="10"
 app:numColumns="3"
 app:vSpace="10" >

 <ImageView
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:scaleType="centerCrop"
  android:src="@drawable/crazy_1" />

 <ImageView
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:scaleType="centerCrop"
  android:src="@drawable/crazy_2" />

 <ImageView
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:scaleType="centerCrop"
  android:src="@drawable/crazy_1" />

 <ImageView
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:scaleType="centerCrop"
  android:src="@drawable/crazy_2" />

 <ImageView
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:scaleType="centerCrop"
  android:src="@drawable/crazy_1" />

 <ImageView
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:scaleType="centerCrop"
  android:src="@drawable/crazy_2" />

 <ImageView
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:scaleType="centerCrop"
  android:src="@drawable/crazy_1" />

 <ImageView
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:scaleType="centerCrop"
  android:src="@drawable/crazy_2" />
 </com.hx.waterfalllayout.WaterfallLayout>
</ScrollView>

((WaterfallLayout) findViewById(R.id.waterfallLayout)).setOnItemClickListener(new com.hx.waterfalllayout.WaterfallLayout.OnItemClickListener() {
  @Override
  public void onItemClick(View v, int index) {
   Toast.makeText(MainActivity.this, "item="+index, Toast.LENGTH_SHORT).show();
  } 
  });

public class OtherGridView extends GridView {

 public OtherGridView(Context paramContext, AttributeSet paramAttributeSet) {
 super(paramContext, paramAttributeSet);
 }

 /** 在ScrollView内，所以要进行计算高度 */
 @Override
 public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,
  MeasureSpec.AT_MOST);
 super.onMeasure(widthMeasureSpec, expandSpec);
 }
}

 /**
 * 进行一些关键性的初始化操作，获取ScrollWaterfallLayout的高度，以及得到第一列的宽度值。并在这里开始加载图片
 */
 @Override
 protected void onLayout(boolean changed, int l, int t, int r, int b) {
 super.onLayout(changed, l, t, r, b);
 if (changed && !loadOnce) {
  firstColumn = (LinearLayout) findViewById(R.id.first_column);
  secondColumn = (LinearLayout) findViewById(R.id.second_column);
  thirdColumn = (LinearLayout) findViewById(R.id.third_column);
  columnWidth = firstColumn.getWidth();
  loadOnce = true;
  loadImages();
 }
 }

 /**
 * 开始加载图片
 */
 public void loadImages() {
 for (int i = 0; i < imageRes.length; i++) {
  Bitmap bitmap = resource2Bitmap(imageRes[i]);
  if (bitmap != null) {
  double ratio = bitmap.getWidth() / (columnWidth * 1.0);
  int scaledHeight = (int) (bitmap.getHeight() / ratio);
  addImage(i, bitmap, columnWidth, scaledHeight);
  }
 }
 }

/**
 * 向ImageView中添加一张图片
 * 
 * @param bitmap
 *  待添加的图片
 * @param imageWidth
 *  图片的宽度
 * @param imageHeight
 *  图片的高度
 */
 private void addImage(int index, Bitmap bitmap, int imageWidth, int imageHeight) {
 LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(imageWidth, imageHeight);
 ImageView imageView = new ImageView(getContext());
 imageView.setLayoutParams(params);
 imageView.setImageBitmap(bitmap);
 imageView.setScaleType(ScaleType.FIT_XY);
 imageView.setPadding(5, 5, 5, 5);
 findColumnToAdd(imageView, imageHeight).addView(imageView);
 //给图片添加点击事件的回调
 imageView.setOnClickListener(new OnClickListener() {
  @Override
  public void onClick(View v) {
  if (onItemClickListener != null) {
   onItemClickListener.onItemClick(v, index);
  }  
  }
 });
 }

 /**
 * 找到此时应该添加图片的一列。原则就是对三列的高度进行判断，当前高度最小的一列就是应该添加的一列。
 * 
 * @param imageView
 * @param imageHeight
 * @return 应该添加图片的一列
 */
 private LinearLayout findColumnToAdd(ImageView imageView,int imageHeight) {
 if (firstColumnHeight <= secondColumnHeight) {
  if (firstColumnHeight <= thirdColumnHeight) {
  firstColumnHeight += imageHeight;
  return firstColumn;
  }
  thirdColumnHeight += imageHeight;
  return thirdColumn;
 } else {
  if (secondColumnHeight <= thirdColumnHeight) {
  secondColumnHeight += imageHeight;
  return secondColumn;
  }
  thirdColumnHeight += imageHeight;
  return thirdColumn;
 }
 }

 //点击事件的回调接口
 public OnItemClickListener onItemClickListener;
 public interface OnItemClickListener {
 void onItemClick(View v, int index);
 }

 public void setOnItemClickListener(OnItemClickListener onItemClickListener){
 this.onItemClickListener = onItemClickListener;
 }

 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:orientation="vertical">

 <com.hx.waterfalllayout.ScrollWaterfallLayout
 android:id="@+id/scrollWaterfallLayout"
 android:layout_width="match_parent"
 android:layout_height="match_parent" >

 <LinearLayout
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:orientation="horizontal" >

  <LinearLayout
  android:id="@+id/first_column"
  android:layout_width="0dp"
  android:layout_height="wrap_content"
  android:layout_weight="1"
  android:orientation="vertical" >
  </LinearLayout>

  <LinearLayout
  android:id="@+id/second_column"
  android:layout_width="0dp"
  android:layout_height="wrap_content"
  android:layout_weight="1"
  android:orientation="vertical" >
  </LinearLayout>

  <LinearLayout
  android:id="@+id/third_column"
  android:layout_width="0dp"
  android:layout_height="wrap_content"
  android:layout_weight="1"
  android:orientation="vertical" >
  </LinearLayout>
 </LinearLayout>
 </com.hx.waterfalllayout.ScrollWaterfallLayout>
</LinearLayout>

((ScrollWaterfallLayout)findViewById(R.id.scrollWaterfallLayout)).setOnItemClickListener(new com.hx.waterfalllayout.ScrollWaterfallLayout.OnItemClickListener() {
  @Override
  public void onItemClick(View v, int index) {
   Toast.makeText(MainActivity.this, "item="+index, Toast.LENGTH_SHORT).show();
  } 
  });