在瀑布流中,如果item中的資料格式完全相同的話,和Grid的效果相同,所以我們要為item設定一個隨機的高度

一.在onBindViewHolder()中為item設定隨機高度

 //修改瀑布流隨機高度
            Random random = new Random();
            ViewGroup.LayoutParams layoutParams = holder.tv.getLayoutParams();
            layoutParams.height=random.nextInt(200)+50;
            holder.tv
 
.setLayoutParams(layoutParams);

二.為item設定間隔

//RecycleView 增加邊距
        int spacingInPixels = 8;
        mRecyclerView.addItemDecoration(new SpacesItemDecoration(spacingInPixels));

再新增一個增加間隔的類

 public class SpacesItemDecoration extends RecyclerView.ItemDecoration {
        private int space;

        public
 
 SpacesItemDecoration(int space) {
            this.space = space;
        }

        @Override
        public void getItemOffsets(Rect outRect, View view,
                                   RecyclerView parent, RecyclerView.State state) {
            outRect.left = space;
            outRect.right = space;
            outRect.bottom = space;

            // Add top margin only for the first item to avoid double space between items
 

            if (parent.getChildPosition(view) == 0)
                outRect.top = space;
        }
    }

三.在新增刪除時報了一個java.lang.NoClassDefFoundError: Failed resolution of: Landroid/support/v4/animation/AnimatorCompatHelper的錯誤
在moudle的gradle中新增如下程式碼:

configurations.all {

    resolutionStrategy.eachDependency { DependencyResolveDetails details ->
        def requested = details.requested
        if (requested.group == 'com.android.support') {
            if (!requested.name.startsWith("multidex")) {
                details.useVersion '24.1.0'
            }
        }
    }
}

RecyclerView的依賴

compile 'com.android.support:mediarouter-v7:25.0.0'
    compile 'com.android.support:appcompat-v7:25.0.0'
    compile 'com.android.support:recyclerview-v7:25.0.0'