Android开发学习--RecycleView入门

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    >
    <android.support.v7.widget.RecyclerView
        android:id="@+id/id_recyclerview_horizontal"
        android:layout_width="match_parent"
        android:layout_height="120dp"
        android:layout_centerVertical="true"
        android:scrollbars="none"
         />
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="120dp"
    android:layout_height="120dp">
    <ImageView
        android:id="@+id/iv"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_margin="5dp"
        android:scaleType="centerCrop"/>
    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/iv"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="5dp"
        android:layout_marginBottom="5dp"
        android:text="some info"
        android:textSize="12dp"
        />

</RelativeLayout>

public class MainActivity extends AppCompatActivity {

    private RecyclerView mRV;
    private List<Integer> mDatas;
    private GalleryAdapter madapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initData();
        mRV = (RecyclerView) findViewById(R.id.id_recyclerview_horizontal);
        LinearLayoutManager li = new LinearLayoutManager(this);
        li.setOrientation(LinearLayoutManager.HORIZONTAL);
        mRV.setLayoutManager(li);//设置布局管理器

        madapter = new GalleryAdapter(this,mDatas);
        mRV.setAdapter(madapter);//设置adapter
    }
    private void initData(){
        mDatas = new ArrayList<Integer>(Arrays.asList(R.drawable.a,
                R.drawable.b, R.drawable.c, R.drawable.e,
                R.drawable.f, R.drawable.g));
    }


}

public class GalleryAdapter extends RecyclerView.Adapter<GalleryAdapter.ViewHolder> {
    private LayoutInflater mInflter;
    private List<Integer> mdatas;

    public GalleryAdapter(Context context, List<Integer> datas){
        mInflter = LayoutInflater.from(context);
        mdatas = datas;
    }

    /**
     * 我们创建的ViewHolder必须继承RecyclerView.ViewHolder，这个RecyclerView.ViewHolder的
     * 构造时必须传入一个View，这个View相当于我们ListView getView中的convertView
     * （即：我们需要inflate的item布局需要传入）。
     */
    public class ViewHolder extends RecyclerView.ViewHolder{
        public ViewHolder(View v){
            super(v);
        }

        ImageView miv;
        TextView mtv;

    }


    //创建ViewHoler
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = mInflter.inflate(R.layout.item,parent,false);
        ViewHolder viewHolder = new ViewHolder(view);
        viewHolder.miv = (ImageView) view.findViewById(R.id.iv);

        return viewHolder;
    }

    //设置值;将数据绑定至viewholder
    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {

        holder.miv.setImageResource(mdatas.get(position));

    }

    //有多少条数据
    @Override
    public int getItemCount() {
        return mdatas.size();
    }



}