RecyclerView实现分割线、点击事件、条目加载动画

RecyclerView需要导包
public class MainActivity extends AppCompatActivity {
    private RecyclerView recy;
    private LinearLayoutManager manager;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recy = (RecyclerView) findViewById(R.id.listview);
        manager = new LinearLayoutManager(this);
        recy.setLayoutManager(manager);
        Myapp myapp = new Myapp();
        recy.setAdapter(myapp);
        myapp.setOnItemClickListener(new Myapp.OnItemClickListener() {
            @Override
            public void onItemClick(View v, int position) {
                Toast.makeText(MainActivity.this, "点击", Toast.LENGTH_SHORT).show();
            }
        });
        recy.addItemDecoration(new MyCustom(this,LinearLayoutManager.VERTICAL));
        recy.setItemAnimator(new DefaultItemAnimator());条目加载动画
    }
}
Myapp:
public class Myapp extends RecyclerView.Adapter<Myapp.MyViewHolder> {
    private final ArrayList<String> list;
    public Myapp() {
        list = new ArrayList<>();
        for (int i = 0; i < 30; i++) {
            list.add("条目" + i);
        }
    }
    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        final View inflate = LayoutInflater.from(parent.getContext()).inflate(R.layout.item, parent,false);
        return new MyViewHolder(inflate);
    }
    public interface OnItemClickListener {
        void onItemClick(View v, int position);
    }
    private OnItemClickListener mOnItemClickListener;
    public void setOnItemClickListener(OnItemClickListener itemClickListener) {
        mOnItemClickListener = itemClickListener;
    }
    @Override
    public void onBindViewHolder(MyViewHolder holder, final int position) {
        holder.tv.setText(list.get(position));
        holder.tv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mOnItemClickListener!=null){
                    mOnItemClickListener.onItemClick(v,position);
                }
            }
        });
    }
    @Override
    public int getItemCount() {
        return list.size();
    }
    public class MyViewHolder extends RecyclerView.ViewHolder {
        private  TextView tv;
        public MyViewHolder(View itemView) {
            super(itemView);
            tv = (TextView) itemView.findViewById(R.id.tv);
        }
    }
}
MyCustom:画分割线类
public class MyCustom extends RecyclerView.ItemDecoration {
    private Context mContext;
    private Drawable mDivider;
    private int mOrientation;
    public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
    public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;
    //我们通过获取系统属性中的listDivider来添加，在系统中的AppTheme中设置
    public static final int[] ATRRS = new int[]{
            android.R.attr.listDivider
    };
    public MyCustom(Context context, int orientation) {
        this.mContext = context;
        final TypedArray ta = context.obtainStyledAttributes(ATRRS);
        this.mDivider = ta.getDrawable(0);
        ta.recycle();
        setOrientation(orientation);
    }
    //设置屏幕的方向
    public void setOrientation(int orientation) {
        if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
            throw new IllegalArgumentException("invalid orientation");
        }
        mOrientation = orientation;
    }
    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
        if (mOrientation == HORIZONTAL_LIST) {
            drawVerticalLine(c, parent, state);
        } else {
            drawHorizontalLine(c, parent, state);
        }
    }
    //画横线, 这里的parent其实是显示在屏幕显示的这部分
    public void drawHorizontalLine(Canvas c, RecyclerView parent, RecyclerView.State state) {
        int left = parent.getPaddingLeft();
        int right = parent.getWidth() - parent.getPaddingRight();
        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            //获得child的布局信息
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
            final int top = child.getBottom() + params.bottomMargin;
            final int bottom = top + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left+params.leftMargin, top, right-params.leftMargin, bottom);
            mDivider.draw(c);
            //Log.d("wnw", left + " " + top + " "+right+"   "+bottom+" "+i);
        }
    }
    //画竖线
    public void drawVerticalLine(Canvas c, RecyclerView parent, RecyclerView.State state) {
        int top = parent.getPaddingTop();
        int bottom = parent.getHeight() - parent.getPaddingBottom();
        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            //获得child的布局信息
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
            final int left = child.getRight() + params.rightMargin;
            final int right = left + mDivider.getIntrinsicWidth();
            mDivider.setBounds(left, top+params.topMargin, right, bottom-params.topMargin);
            mDivider.draw(c);
        }
    }
    //由于Divider也有长宽高，每一个Item需要向下或者向右偏移
    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        if (mOrientation == HORIZONTAL_LIST) {
            //画横线，就是往下偏移一个分割线的高度
            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
        } else {
            //画竖线，就是往右偏移一个分割线的宽度
            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
        }
    }
}
drawable下：item:
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="#ff0000" />
    <size
        android:height="2dp"
        android:width="2dp"
        />
</shape>
Values下：style:
<item name="android:listDivider">@drawable/item</item>
XML:
<android.support.v7.widget.RecyclerView
    android:id="@+id/listview"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>
ITEM:
<TextView
    android:id="@+id/tv"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    />