Android(安卓)RecyclerView.Adapter基本使用

MainActivity.java

public class MainActivity extends AppCompatActivity {    private RecyclerView mRecyclerView;    private MyAdapter mMyAdapter;    private LinearLayoutManager mLayoutManager;    private List list;    @Override    protected void onCreate(final Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initData();        mRecyclerView = findViewById(R.id.recycler_view);        mMyAdapter = new MyAdapter(list);        mLayoutManager = new LinearLayoutManager(this);        mRecyclerView.setLayoutManager(mLayoutManager);        mRecyclerView.setAdapter(mMyAdapter);    }    private void initData() {        list = new ArrayList<>();        for (int i = 0; i <= 20; i++) {            list.add("Item " + i);        }    }}

Adapter.java

public class MyAdapter extends RecyclerView.Adapter {    //数据源    private List mList;    public MyAdapter(List list) {        mList = list;    }    //返回item个数    @Override    public int getItemCount() {        return mList.size() ;    }    //创建ViewHolder    @NonNull    @Override    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {    return new NormalHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item, parent, false));    }    //填充视图    @Override    public void onBindViewHolder(@NonNull final MyAdapter.ViewHolder holder, final int position) {        holder.mView.setText(mList.get(position));    }    public class ViewHolder extends RecyclerView.ViewHolder {        public TextView mView;        public ViewHolder(View itemView) {            super(itemView);            mView = itemView.findViewById(R.id.text_view);        }    }}

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