Android GridLayoutManager.setSpanSizeLookup的使用介绍

Posted 2023-03-13 路宇

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前言：
使用setSpanSizeLookup后的效果图如下

对应的Activity代码如下，setSpanSizeLookup的具体解释已经在代码中给出：

public class GrideActivity extends AppCompatActivity implements GrideAdapter.OnItemClickListener 
    private ActivityGrideBinding binding;
    private GrideAdapter grideAdapter;
    private List<GrideModel> grideModels = new ArrayList<>();
    private static final String TAG = "GrideActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        binding = DataBindingUtil.setContentView(this, R.layout.activity_gride);
        GridLayoutManager gridLayoutManager = new GridLayoutManager(this, 3, RecyclerView.VERTICAL, false);
        binding.rvList.setLayoutManager(gridLayoutManager);
        for (int i = 0; i < 20; i++) 
            grideModels.add(new GrideModel("https://tse3-mm.cn.bing.net/th/id/OIP-C.ezHUw2d5cvio6idA9t5zCwHaEK?w=302&h=180&c=7&r=0&o=5&dpr=1.3&pid=1.7", "android开发"));
        
        grideAdapter = new GrideAdapter(grideModels);
        grideAdapter.setOnItemClickListener(this);
        gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() 
            @Override
            public int getSpanSize(int position) //列表项的占位规则
                Log.i(TAG, "getSpanSize,position：" + position);
                //返回该item所占的份数 那么下标为4的item占三份，那么则占据整个屏幕的宽。
                //注意一个item所占的份数，不能超过GridLayoutManager的spanCount
                return (1 + position) % 7 == 0 ? 3 : 1;
            
        );
        binding.rvList.setAdapter(grideAdapter);
    

    @Override
    public void onItemClick(int position) 
        ToastUtils.showShort(position);