RecycleView加入底部loadmore(三)
来源:互联网 发布:编程temp是什么意思 编辑:程序博客网 时间:2024/05/29 06:48
之前的文章我们介绍了
onCreateViewHolder
onBindViewHolder
getItemCount
getItemViewType
onViewAttachedToWindow
onViewDetachedFromWindow
共六个方法,那么,你可能会想他们执行的顺序是什么样的?
为了方便观察,我们先看只有一个item的情况,
protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view); mLayoutManager = new LinearLayoutManager(this); mRecyclerView.setLayoutManager(mLayoutManager); String [] myDataset = {"11"}; mAdapter = new MyAdapter(myDataset); mRecyclerView.setAdapter(mAdapter);}
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> { private String[] mDataset; public static class ViewHolder extends RecyclerView.ViewHolder { public TextView mTextView; public ViewHolder(TextView v) { super(v); mTextView = v; } } public MyAdapter(String[] myDataset) { mDataset = myDataset; } @Override public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { TextView v = (TextView) LayoutInflater.from(parent.getContext()).inflate(R.layout.my_text_view, parent, false); ViewHolder vh = new ViewHolder(v); Log.i("MyAdapter","onCreateViewHolder"); return vh; } @Override public void onBindViewHolder(ViewHolder holder, int position) { Log.i("MyAdapter","onBindViewHolder"); } @Override public int getItemCount() { Log.i("MyAdapter","getItemCount"); return mDataset.length; } @Override public int getItemViewType(int position) { Log.i("MyAdapter","getItemViewType"); return super.getItemViewType(position); } @Override public void onViewAttachedToWindow(ViewHolder holder) { Log.i("MyAdapter","onViewAttachedToWindow"); super.onViewAttachedToWindow(holder); } @Override public void onViewDetachedFromWindow(ViewHolder holder) { Log.i("MyAdapter","onViewDetachedFromWindow"); super.onViewDetachedFromWindow(holder); }}打印结果如下
09-13 14:25:21.919 12484-12484/com.example.superdy.test I/MyAdapter: getItemCount
09-13 14:25:21.954 12484-12484/com.example.superdy.test I/MyAdapter: getItemCount
09-13 14:25:21.962 12484-12484/com.example.superdy.test I/MyAdapter: getItemCount
09-13 14:25:21.962 12484-12484/com.example.superdy.test I/MyAdapter: getItemCount
09-13 14:25:21.963 12484-12484/com.example.superdy.test I/MyAdapter: getItemCount
09-13 14:25:21.963 12484-12484/com.example.superdy.test I/MyAdapter: getItemViewType
09-13 14:25:21.963 12484-12484/com.example.superdy.test I/MyAdapter: getItemViewType
09-13 14:25:21.963 12484-12484/com.example.superdy.test I/MyAdapter: getItemViewType
09-13 14:25:21.967 12484-12484/com.example.superdy.test I/MyAdapter: onCreateViewHolder
09-13 14:25:21.970 12484-12484/com.example.superdy.test I/MyAdapter: onBindViewHolder
09-13 14:25:21.971 12484-12484/com.example.superdy.test I/MyAdapter: onViewAttachedToWindow
可以看到,在只有一个item的情况下,getItemCount调用了5次,getItemType调用了三次
09-13 14:25:21.967 12484-12484/com.example.superdy.test I/MyAdapter: onCreateViewHolder
09-13 14:25:21.970 12484-12484/com.example.superdy.test I/MyAdapter: onBindViewHolder
09-13 14:25:21.971 12484-12484/com.example.superdy.test I/MyAdapter: onViewAttachedToWindow
分别调用了一次
我们看看两个item的时候,情况如何,
09-13 14:31:01.371 24304-24304/? I/MyAdapter: getItemCount
09-13 14:31:01.397 24304-24304/? I/MyAdapter: getItemCount
09-13 14:31:01.398 24304-24304/? I/MyAdapter: getItemCount
09-13 14:31:01.398 24304-24304/? I/MyAdapter: getItemCount
09-13 14:31:01.399 24304-24304/? I/MyAdapter: getItemCount
09-13 14:31:01.399 24304-24304/? I/MyAdapter: getItemViewType
09-13 14:31:01.400 24304-24304/? I/MyAdapter: getItemViewType
09-13 14:31:01.400 24304-24304/? I/MyAdapter: getItemViewType
09-13 14:31:01.404 24304-24304/? I/MyAdapter: onCreateViewHolder
09-13 14:31:01.404 24304-24304/? I/MyAdapter: onBindViewHolder
09-13 14:31:01.404 24304-24304/? I/MyAdapter: onViewAttachedToWindow
09-13 14:31:01.405 24304-24304/? I/MyAdapter: getItemCount
09-13 14:31:01.405 24304-24304/? I/MyAdapter: getItemViewType
09-13 14:31:01.405 24304-24304/? I/MyAdapter: getItemViewType
09-13 14:31:01.405 24304-24304/? I/MyAdapter: getItemViewType
09-13 14:31:01.406 24304-24304/? I/MyAdapter: onCreateViewHolder
09-13 14:31:01.406 24304-24304/? I/MyAdapter: onBindViewHolder
09-13 14:31:01.406 24304-24304/? I/MyAdapter: onViewAttachedToWindow
三个的时候
09-13 14:31:59.614 26325-26325/com.example.superdy.test I/MyAdapter: getItemCount
09-13 14:31:59.647 26325-26325/com.example.superdy.test I/MyAdapter: getItemCount
09-13 14:31:59.647 26325-26325/com.example.superdy.test I/MyAdapter: getItemCount
09-13 14:31:59.647 26325-26325/com.example.superdy.test I/MyAdapter: getItemCount
09-13 14:31:59.650 26325-26325/com.example.superdy.test I/MyAdapter: getItemCount
09-13 14:31:59.650 26325-26325/com.example.superdy.test I/MyAdapter: getItemViewType
09-13 14:31:59.650 26325-26325/com.example.superdy.test I/MyAdapter: getItemViewType
09-13 14:31:59.650 26325-26325/com.example.superdy.test I/MyAdapter: getItemViewType
09-13 14:31:59.653 26325-26325/com.example.superdy.test I/MyAdapter: onCreateViewHolder
09-13 14:31:59.653 26325-26325/com.example.superdy.test I/MyAdapter: onBindViewHolder
09-13 14:31:59.654 26325-26325/com.example.superdy.test I/MyAdapter: onViewAttachedToWindow
09-13 14:31:59.654 26325-26325/com.example.superdy.test I/MyAdapter: getItemCount
09-13 14:31:59.654 26325-26325/com.example.superdy.test I/MyAdapter: getItemViewType
09-13 14:31:59.654 26325-26325/com.example.superdy.test I/MyAdapter: getItemViewType
09-13 14:31:59.654 26325-26325/com.example.superdy.test I/MyAdapter: getItemViewType
09-13 14:31:59.657 26325-26325/com.example.superdy.test I/MyAdapter: onCreateViewHolder
09-13 14:31:59.657 26325-26325/com.example.superdy.test I/MyAdapter: onBindViewHolder
09-13 14:31:59.657 26325-26325/com.example.superdy.test I/MyAdapter: onViewAttachedToWindow
09-13 14:31:59.658 26325-26325/com.example.superdy.test I/MyAdapter: getItemCount
09-13 14:31:59.658 26325-26325/com.example.superdy.test I/MyAdapter: getItemViewType
09-13 14:31:59.658 26325-26325/com.example.superdy.test I/MyAdapter: getItemViewType
09-13 14:31:59.658 26325-26325/com.example.superdy.test I/MyAdapter: getItemViewType
09-13 14:31:59.659 26325-26325/com.example.superdy.test I/MyAdapter: onCreateViewHolder
09-13 14:31:59.659 26325-26325/com.example.superdy.test I/MyAdapter: onBindViewHolder
09-13 14:31:59.659 26325-26325/com.example.superdy.test I/MyAdapter: onViewAttachedToWindow
可以看到规律是,前面有四个getItemCount,这是固定的,
然后每一个循环中一次getItemCount,三次getItemViewType
然后onCreateViewHolder,onBindViewHolder,onViewAttachedToWindow
都是只有一次。
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