学习Android开发之RecyclerView使用初探

<android.support.v7.widget.RecyclerView
android:id="@+id/main_lv"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"/> 

public class MyAdapter extends RecyclerView.Adapter {
  private static final String TAG = "MyAdapter";

  private final List<Map<String, Object>> data;
  private final View root;
  private OnItemButtonCLickListener listener;

  public MyAdapter(List<Map<String, Object>> data, View root) {
    this.data = data;
    this.root = root;
  }

  public void setOnItemButtonClickListener(OnItemButtonCLickListener listener){
    this.listener = listener;
  }


  class ViewHolder extends RecyclerView.ViewHolder {
    TextView reason, money, date;
    Button delete,alter;

    public ViewHolder(View itemView) {
      super(itemView);
      reason = (TextView) itemView.findViewById(R.id.main_rv_item_reason);
      money = (TextView) itemView.findViewById(R.id.main_rv_item_money);
      date = (TextView) itemView.findViewById(R.id.main_rv_item_date);
      delete = (Button) itemView.findViewById(R.id.main_rv_item_remove);
      alter = (Button) itemView.findViewById(R.id.main_rv_item_alter);
    }

  }

  @Override
  public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    ViewHolder vh = new ViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout
        .main_lv_item, null));
    return vh;
    
  }

  @Override
  public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
    final ViewHolder vh = (ViewHolder) holder;
    vh.date.setText(data.get(position).get("date").toString());
    vh.reason.setText(data.get(position).get("reason").toString());
    vh.money.setText(data.get(position).get("money").toString());
    vh.delete.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        Snackbar snackBar = Snackbar.make(root, "Are you sure to delete it？", Snackbar.LENGTH_LONG);
        snackBar.setAction("YES", new MyOnClickListener(vh.getLayoutPosition()));
        snackBar.show();
      }
    });
    vh.alter.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        listener.OnItemAlter(vh.getLayoutPosition());
      }
    });
  }

  @Override
  public int getItemCount() {
    return data.size();
  }

  private class MyOnClickListener implements View.OnClickListener {
    private final int position;

    public MyOnClickListener(int position) {
      this.position = position;
    }

    @Override
    public void onClick(View v) {
      listener.OnItemDelete(position);
    }
  }

  interface OnItemButtonCLickListener {
    void OnItemAlter(int position);
    void OnItemDelete(int position);
  }
}

 rv = (RecyclerView) findViewById(R.id.main_lv);
adapter = new MyAdapter(data, root);
rv.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false)); 

// 设置布局，否则无法正常使用
adapter.setOnItemButtonClickListener(this);
rv.setAdapter(adapter);

@Override
  public void OnItemAlter(int position) {
    //Intent intent = new Intent(MainActivity.this, AlterActivity.class);
    //intent.putExtra("id", Integer.parseInt(data.get(position).get("id").toString()));
    //intent.putExtra("date", data.get(position).get("date").toString());
    //intent.putExtra("money", data.get(position).get("money").toString());
    //intent.putExtra("reason", data.get(position).get("reason").toString());
    //startActivityForResult(intent, REQUEST_ALTER);
  }

  @Override
  public void OnItemDelete(int position) {
    Log.d(TAG, "OnItemDelete() called with: " + "position = [" + position + "]");
    //Map<String, Object> backup = data.get(position);
    //data.remove(position);
    //database.execSQL("delete from tally where id=?", new String[]{backup.get
    //    ("id").toString()});
    adapter.notifyItemRemoved(position);
  }