RecyclerView 小记

RecyclerView，是在v7包加入的，一个灵活的view可以展示巨大的数据集，类似于listview的viewholder复用已经优化好了。

语言是苍白的，代码是最生动的叙说：

布局：

<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ui.main.MainActivity"
    android:padding="12dp"
    android:orientation="vertical">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:overScrollMode="never"
        android:clipToPadding="false"/>

    <ProgressBar
        android:id="@+id/progress"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:visibility="gone"
        />

</FrameLayout>

　　

adapter:

package com.escorps.retrodagger.adapter;

import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.escorps.retrodagger.R;
import com.escorps.retrodagger.models.PetModel;
import java.util.List;
import butterknife.ButterKnife;
import butterknife.InjectView;

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder>{

    private List<PetModel> items;

    public void setItems(List<PetModel> items){
        this.items = items;
    }

    @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_recycler, parent, false);
        return new ViewHolder(v);
    }

    @Override public void onBindViewHolder(final ViewHolder holder, int position) {
        final PetModel item = items.get(position);

        holder.textName.setText(item.getName());

        holder.itemView.setTag(item);
    }

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

    protected static class ViewHolder extends RecyclerView.ViewHolder {

        @InjectView(R.id.textName) TextView textName;

        public ViewHolder(View itemView) {
            super(itemView);

            ButterKnife.inject(this, itemView);
        }
    }

}

注意在使用adapter之前： recyclerView.setLayoutManager(new GridLayoutManager(this, 1));