RecycleView实现瀑布流的效果

RecycleView实现瀑布流的效果图:


1.因为RecycleView是android5.0后出来的,需要添加recycleview依赖库。快捷键Ctrl+Shift+Alt+S弹出项目结构界面。
RecycleView实现瀑布流的效果_第1张图片

2.在弹出的对话框中选择recycleview-v7的依赖库,点击确定
RecycleView实现瀑布流的效果_第2张图片

3.在activity_main布局文件中创建RecycleView控件

    
    
4.在MainActivity.java文件中实例化控件,创建图片数组。
public class MainActivity extends AppCompatActivity {
    private RecyclerView recycleview;
    private int image[] = {R.drawable.pre12,  R.drawable.pre15,R.drawable.pre19,
            R.drawable.pre13,R.drawable.pre14, R.drawable.pre15, R.drawable.pre21,
            R.drawable.pre16, R.drawable.pre17, R.drawable.pre19,
            R.drawable.pre21,  R.drawable.pre15, R.drawable.pre22};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recycleview = (RecyclerView) findViewById(R.id.Recycle_View);
    }
}
5.创建DataBean类,存放Recycle的数据
//创建DataBean类,存放数据
public class DataBean {
    public int Icon;
    public String name;
}
6.我们要RecycleView实现瀑布流,需要创建MyRecycleStaggeredGridAdapter(名字自己定)适配器
//RecycleView的适配器,要注意指定的泛型,一般我们就是类名的ViewHolder继承ViewHolder(内部已经实现了复用优化机制)
public class MyRecycleStaggerAdapter extends RecyclerView.Adapter{
    private Context mContext;
    //泛型是RecycleView所需的bean类
    private ListmList;
    //创建构造方法;一个需要接受两个参数,上下文,集合对象(包含了我们所需要的数据)
    public MyRecycleStaggerAdapter(Context context, List list) {
        mContext = context;
        mList = list;
    }

    @Override
    //创建staggerViewHolder,并把ViewHolder返回出去
    public MyRecycleStaggerAdapter.StaggerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        //转换一个View布局,决定了item的样子, 参数:1.上下文 2.Xml布局资源 3.为null
        View view = View.inflate(mContext, R.layout.item_stagger, null);
        //创建一个staggerViewHolder对象
        StaggerViewHolder staggerViewHolder = new StaggerViewHolder(view);
        //把staggerViewHolder对象传出去
        return staggerViewHolder;
    }

    @Override
    //当VIewHolder和数据绑定时回调
    public void onBindViewHolder(MyRecycleStaggerAdapter.StaggerViewHolder holder, int position) {
        //从集合里拿对应item数据对象
        DataBean dataBean = mList.get(position);
        //给Holder里面的控件对象设置数据
        holder.setData(dataBean);
    }

    @Override
    public int getItemCount() {
        //决定RecycleView有多少条item
        if(mList!=null&&mList.size()>0){
            return mList.size();
        }
        return 0;
    }

    public class StaggerViewHolder extends RecyclerView.ViewHolder {
        private final ImageView mIcon;
        private final TextView mTextView;
        public StaggerViewHolder(View itemView) {
            super(itemView);
            mIcon = (ImageView)itemView.findViewById(R.id.item_stagger_iv_icon);
            mTextView = (TextView) itemView.findViewById(R.id.item_stagger_tv_name);
        }

        public void setData(DataBean data) {
            //给ImageView设置图片数据
            mIcon.setImageResource(data.Icon);
            //给TextView设置文本数据
            mTextView.setText(data.name);
        }
    }
}
7.在创建适配器时,需要创建一个item_stagger布局

    
    
8.创建实现瀑布流的方法StaggerLoadData(Boolean inversion,Boolean orientation );需要判断瀑布流的方向;
private void StaggerLoadData(Boolean inversion,Boolean orientation) {
        //集合对象
        ArrayList list = new ArrayList<>();
        //给DataBean类放数据,最后把装好数据的DataBean类放到集合里
        for(int i=0;i
9.创建Menu菜单,来实现RecycleView瀑布流的各种样式,用onCreateOptionsMenu 加载一个菜单的布局
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        //加载布局使用菜单特有方法getMenuInflater。或Inflate对象,参数:1.菜单显示的不就 2.固定menu
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }
10.在res下创建menu文件夹,在menu文件夹中创建menu_item布局;


    
        
            
            
            
            
        
    
11.用onOptionsItemSelected 给menu菜单添加点击事件
//菜单按钮点击事件的处理
    public boolean onOptionsItemSelected(MenuItem item) {
        //获取item的id
        int itemId = item.getItemId();
        //stagger标准显示
        if (itemId == R.id.action_stagger_normal) {
            StaggerLoadData(false, true);
            return true;
        }//stagger垂直显示
        else if (itemId == R.id.action_stagger_reverse) {
            StaggerLoadData(true, true);
        }//stagger水平显示
        else if (itemId == R.id.action_stagger_horizontal) {
            StaggerLoadData(false, false);
        }//stagger水平反向显示
        else if (itemId == R.id.action_stagger_horizontal_reverse) {
            StaggerLoadData(true, false);
        }
        return super.onOptionsItemSelected(item);
    }

MainActivity.java的代码:
public class MainActivity extends AppCompatActivity {
    private RecyclerView recycleview;
    private int image[] = {R.drawable.pre12,  R.drawable.pre15,R.drawable.pre19,
            R.drawable.pre13,R.drawable.pre14, R.drawable.pre15, R.drawable.pre21,
            R.drawable.pre16, R.drawable.pre17, R.drawable.pre19,
            R.drawable.pre21,  R.drawable.pre15, R.drawable.pre22};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recycleview = (RecyclerView) findViewById(R.id.Recycle_View);
    }

    private void StaggerLoadData(Boolean inversion,Boolean orientation) {
        //集合对象
        ArrayList list = new ArrayList<>();
        //给DataBean类放数据,最后把装好数据的DataBean类放到集合里
        for(int i=0;i










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