Android(安卓)RecycleView实现不同样式Item样式效果完美解决

在我们开发过程中经常会遇到需要我们展示不同样式列表的情况，通常我们都会使用ListView展示列表，然后实现BaseAdapter两个方法，即：getViewTypeCount() 和 getItemViewType(int position)即可实现

不过在Android Nougat Google发布了RecycleView之后，大家都纷纷弃ListView ,GridView，而使用RecycleView。所以今天我们写一个RecycleView实现不同Item条目样式的案例。

RecycleView和RecycleViewAdapter使用步骤:

1,初始化RecycleView及相关设置

     mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView);        //设置适配器管理器：LinearLayoutManager GridLayoutManager StaggeredGridLayoutManager(瀑布流)，        mRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));        //添加分割线        mRecyclerView.addItemDecoration(new RecycleItemDecoration(context, RecycleItemDecoration.VERTICAL_LIST));

2,设置适配器和添加数据

mRecyclerView.setAdapter(new RecycleAdapter(context, initData()));

 private List initData() {        List mData = new ArrayList<>();        for (int i = 'A'; i < 'Z'; i++) {            Bean bean = new Bean();            bean.setText((char) i + "");            int type = i % 3;            if (type == 0) {                bean.setType(0);            } else if (type == 1) {                bean.setType(1);            } else if (type == 2) {                bean.setType(2);            }            mData.add(bean);        }        return mData;    }

3，实现RecycleViewAdapter适配器并实现所需方法

通常实现常用列表样式只需要实现两个方法即可：

public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)

用来创建ViewHolder并将item布局添加ViewHolder中

 public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position)

获取已绑定的ViewHolder对象并进行数据填充

而我们使用RecycleView实现不同Item样式的展示，同ListVIew一样，RecycleView也给我们提供了类似的方法，

 public int getItemViewType(int position)

获取指定苏索引条目的样式类型，返回值即为当前条目样式的类型（我总感觉应该是setItemViewType比较恰当）

通过这三部我们就基本可以使用RecycleView和RecycleAdapter实现列表和多种Item样式布局展示。下面我们展示详细代码：

/** * 作    者 ：丁广帅 * 创建日期 ：2016/9/29 10:30 * 描   述 ： */public class PerfertectFg extends BaseFragment {    @SuppressLint("ValidFragment")    public PerfertectFg(String tabNames, int tabIcons) {        super(tabNames, tabIcons);    }    public PerfertectFg() {    }    private RecyclerView mRecyclerView;    private Context context;    @Override    protected void onCreateViewLazy(Bundle savedInstanceState) {        super.onCreateViewLazy(savedInstanceState);        setContentView(R.layout.child_three);        context = getContext();        mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView);        //设置适配器管理器：LinearLayoutManager GridLayoutManager StaggeredGridLayoutManager(瀑布流)，        mRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));        //添加分割线        mRecyclerView.addItemDecoration(new RecycleItemDecoration(context, RecycleItemDecoration.VERTICAL_LIST));        mRecyclerView.setAdapter(new RecycleAdapter(context, initData()));    }    private List initData() {        List mData = new ArrayList<>();        for (int i = 'A'; i < 'Z'; i++) {            Bean bean = new Bean();            bean.setText((char) i + "");            int type = i % 3;            if (type == 0) {                bean.setType(0);            } else if (type == 1) {                bean.setType(1);            } else if (type == 2) {                bean.setType(2);            }            mData.add(bean);        }        return mData;    }}

借鉴鸿神的分割线样式：Android RecyclerView 使用完全解析体验艺术般的控件

public class RecycleItemDecoration extends RecyclerView.ItemDecoration {    /**     * 读取attr资源     */    private static final int[] ATTRS = new int[]{            android.R.attr.listDivider    };    public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;    public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;    private Drawable mDivider;    //分割线高度    private int mOrientation;    public RecycleItemDecoration(Context context, int orientation) {        final TypedArray a = context.obtainStyledAttributes(ATTRS);        mDivider = a.getDrawable(0);        a.recycle();        setOrientation(orientation);    }    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) {        if (mOrientation == VERTICAL_LIST) {            drawVertical(c, parent);        } else {            drawHorizontal(c, parent);        }    }    /**     * 绘制竖直方向分割线     *     * @param c     * @param parent     */    public void drawVertical(Canvas c, RecyclerView parent) {        final int left = parent.getPaddingLeft();        final int right = parent.getWidth() - parent.getPaddingRight();        final int childCount = parent.getChildCount();        for (int i = 0; i < childCount; i++) {            final View child = parent.getChildAt(i);            android.support.v7.widget.RecyclerView v = new android.support.v7.widget.RecyclerView(parent.getContext());            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child                    .getLayoutParams();            final int top = child.getBottom() + params.bottomMargin;            final int bottom = top + mDivider.getIntrinsicHeight();            mDivider.setBounds(left, top, right, bottom);            mDivider.draw(c);        }    }    /**     * 绘制水平方向分割线     *     * @param c     * @param parent     */    public void drawHorizontal(Canvas c, RecyclerView parent) {        final int top = parent.getPaddingTop();        final int bottom = parent.getHeight() - parent.getPaddingBottom();        final int childCount = parent.getChildCount();        for (int i = 0; i < childCount; i++) {            final View child = parent.getChildAt(i);            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child                    .getLayoutParams();            final int left = child.getRight() + params.rightMargin;            final int right = left + mDivider.getIntrinsicHeight();            mDivider.setBounds(left, top, right, bottom);            mDivider.draw(c);        }    }    @Override    public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {        //区别类型将分割线设置在下方和右方        if (mOrientation == VERTICAL_LIST) {            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());        } else {            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);        }    }}

d RecycleView适配器实现，需要我们注意的一点是如果仅有一种Item样式RecycleAdapter的泛型我们直接写成自定义ViewHolder即可。如果是多种Item样式的话，RecycleAdapter泛型必须为RecycleView.ViewHolder，然后再进行强转

((ViewHolderA) holder).text.setText(mData.get(position).getText() + "------样式一");

/** * 作    者 ：丁广帅 * 创建日期 ：2016/10/14 14:26 * 描   述 ： */public class RecycleAdapter extends RecyclerView.Adapter {    /**     * RecycleViewAdapter 要素点：     *      * 1，ViewHolder必须继承RecyclerView.ViewHolder     * 2，RecycleView.Adapter的泛型为自定义ViewHolder     */    private List mData;    private Context context;    public enum Item_Type {        RECYCLEVIEW_ITEM_TYPE_1,        RECYCLEVIEW_ITEM_TYPE_2,        RECYCLEVIEW_ITEM_TYPE_3    }    public RecycleAdapter(Context context, List mData) {        this.mData = mData;        this.context = context;    }    /**     * 创建ViewHolder     *     * @param parent     * @param viewType :不同ItemView的类型     * @return     */    @Override    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        if (viewType == Item_Type.RECYCLEVIEW_ITEM_TYPE_1.ordinal()) {            View mView = LayoutInflater.from(context).inflate(R.layout.recycle_item_a, null);            ViewHolderA viewHolder = new ViewHolderA(mView);            return viewHolder;        } else if (viewType == Item_Type.RECYCLEVIEW_ITEM_TYPE_2.ordinal()) {            View mView = LayoutInflater.from(context).inflate(R.layout.recycle_item_b, null);            ViewHolderB viewHolder = new ViewHolderB(mView);            return viewHolder;        } else if (viewType == Item_Type.RECYCLEVIEW_ITEM_TYPE_3.ordinal()) {            View mView = LayoutInflater.from(context).inflate(R.layout.recycle_item_c, null);            ViewHolderC viewHolder = new ViewHolderC(mView);            return viewHolder;        }        return null;    }    /**     * 绑定数据：可以直接拿到已经绑定控件的Viewholder对象     *     * @param holder     * @param position     */    @Override    public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position) {        if (holder instanceof ViewHolderA) {            ((ViewHolderA) holder).text.setText(mData.get(position).getText() + "------样式一");        } else if (holder instanceof ViewHolderB) {            ((ViewHolderB) holder).text.setText(mData.get(position).getText() + "------样式二");        } else if (holder instanceof ViewHolderC) {            ((ViewHolderC) holder).text.setText(mData.get(position).getText() + "------样式三");        }    }    //返回值赋值给onCreateViewHolder的参数 viewType    @Override    public int getItemViewType(int position) {        if (mData.get(position).getType() == 0) {            return Item_Type.RECYCLEVIEW_ITEM_TYPE_1.ordinal();        } else if (mData.get(position).getType() == 1) {            return Item_Type.RECYCLEVIEW_ITEM_TYPE_2.ordinal();        } else if (mData.get(position).getType() == 2) {            return Item_Type.RECYCLEVIEW_ITEM_TYPE_3.ordinal();        }        return -1;    }    @Override    public int getItemCount() {        return mData.size();    }    class ViewHolderA extends RecyclerView.ViewHolder {        public TextView text;        public ViewHolderA(View itemView) {            super(itemView);            text = (TextView) itemView.findViewById(R.id.text);        }    }    class ViewHolderB extends RecyclerView.ViewHolder {        public TextView text;        public ViewHolderB(View itemView) {            super(itemView);            text = (TextView) itemView.findViewById(R.id.text);        }    }    class ViewHolderC extends RecyclerView.ViewHolder {        public TextView text;        public ViewHolderC(View itemView) {            super(itemView);            text = (TextView) itemView.findViewById(R.id.text);        }    }}

最后还是建议大家以后尽量使用RecycleView来替代ListVIew和GridView！！！

下载链接：http://download.csdn.net/detail/ding_gc/9655977

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