简单介绍使用BaseRecyclerViewAdapterHelper

首先来看一个图知道可以有哪些功能

依照上图可以知道BaseRecyclerViewAdapterHelper分别有的优点和功能是：

1.优化适配器减少代码

2.item项的点击事件

3.为adapter添加动画效果

4.为recyclerview（或adapter）添加header和footer布局

5.对item进行点击拖动

6.自动加载数据

7.实现多级联动

8.可以自定义实现多类型布局

9.设置布局的加载方式：如加载错误，成功，失败，空数据时显示不同界面

为BaseRecyclerViewAdapterHelper为其配置和导入依赖

在 build.gradle 的 repositories 添加:

allprojects {        repositories {            maven { url "https://jitpack.io" }        }    }

然后在dependencies中添加依赖
compile 'com.android.support:recyclerview-v7:25.3.1'

compile 'com.github.CymChad:BaseRecyclerViewAdapterHelper:2.9.23'

官方地址：https://github.com/CymChad/BaseRecyclerViewAdapterHelper

1.首先来观察使用BaseQuickAdapter（这个主要是针对不实现多布局而用）的使用

public class AnimationAdapter extends BaseQuickAdapter<Status, BaseViewHolder> {///中括号中第一个参数：Java的bean，第二个参数：固定的BaseViewHolder，    public AnimationAdapter() {        super(R.layout.layout_animation, DataServer.getSampleData(100));    }    @Override    protected void convert(BaseViewHolder helper, Status item) {//实现数据绑定        helper.addOnClickListener(R.id.img).addOnClickListener(R.id.tweetName);//为控件添加点击事件，如果要在哪个控件上实现点击参数中就用哪个控件的ID        switch (helper.getLayoutPosition() %                3) {            case 0:                helper.setImageResource(R.id.img, R.mipmap.animation_img1);                break;            case 1:                helper.setImageResource(R.id.img, R.mipmap.animation_img2);                break;            case 2:                helper.setImageResource(R.id.img, R.mipmap.animation_img3);                break;        }        helper.setText(R.id.tweetName, "Hoteis in Rio de Janeiro");        String msg = "\"He was one of Australia's most of distinguished artistes, renowned for his portraits\"";        ((TextView) helper.getView(R.id.tweetText)).setText(SpannableStringUtils.getBuilder(msg).append("landscapes and nedes").setClickSpan(clickableSpan).create());        ((TextView) helper.getView(R.id.tweetText)).setMovementMethod(ClickableMovementMethod.getInstance());        ((TextView) helper.getView(R.id.tweetText)).setFocusable(false);        ((TextView) helper.getView(R.id.tweetText)).setClickable(false);        ((TextView) helper.getView(R.id.tweetText)).setLongClickable(false);    }    ClickableSpan clickableSpan = new ClickableSpan() {        @Override        public void onClick(View widget) {            ToastUtils.showShortToast("事件触发了 landscapes and nedes");        }        @Override        public void updateDrawState(TextPaint ds) {            ds.setColor(Utils.getContext().getResources().getColor(R.color.clickspan_color));            ds.setUnderlineText(true);        }    };}

Adapter调用和点击事件

这里的点击事件两种第一中是整个item设置点击事件：如果是整体item则不用再adapter中添加 helper.addOnChickListener(控件Id)如果设置了反而不能触发点击事件

我们直接用adapter.setOnItemChickLisener（）就可以触发点击事件

第二种给item的某个按钮设置点击

如果我们要在item中的某一个设置点击则需要在adapter中添加helper.addOnChickListener(控件Id)这句代码

用adapter.setOnItemChildClickListenre()来设置点击事件.

mRecyclerView= (RecyclerView) findViewById(R.id.recycler);        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));        mRecyclerView.setHasFixedSize(true);//是否重新设置计算item的高度和宽度//        list=generrateData();        initData();        initAdapter();//        mAdapter=new ExpandableItemAdapter(list);        mRecyclerView.setAdapter(mAdapter);        //mRecyclerView的点击事件同样要在adapter中使用helper.addOnClickListener(R.id.name);才能使用        /*mRecyclerView.addOnItemTouchListener(new OnItemChildClickListener() {            @Override            public void onSimpleItemChildClick(BaseQuickAdapter adapter, View view, int position) {            }        });*/        mAdapter.setOnItemClickListener(new BaseQuickAdapter.OnItemClickListener() {            @Override            public void onItemClick(BaseQuickAdapter adapter, View view, int position) {                Toast.makeText(MainActivity.this, "ddd", Toast.LENGTH_SHORT).show();            }        });

2.拖动和移动删除使用

直接看代码

public class ItemDragAndSwipeUseActivity extends BaseActivity {    private static final String TAG = ItemDragAndSwipeUseActivity.class.getSimpleName();    private RecyclerView mRecyclerView;    private List<String> mData;    private ItemDragAdapter mAdapter;    private ItemTouchHelper mItemTouchHelper;//item点击帮助类    private ItemDragAndSwipeCallback mItemDragAndSwipeCallback;//item拖动回调    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_item_touch_use);        setBackBtn();        setTitle("ItemDrag  And Swipe");        mRecyclerView = (RecyclerView) findViewById(R.id.rv_list);        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));        mData = generateData(50);        OnItemDragListener listener = new OnItemDragListener() {            //item开始拖动            @Override            public void onItemDragStart(RecyclerView.ViewHolder viewHolder, int pos) {                Log.d(TAG, "drag start");                BaseViewHolder holder = ((BaseViewHolder) viewHolder);//                holder.setTextColor(R.id.tv, Color.WHITE);            }                        //item开始移动            @Override            public void onItemDragMoving(RecyclerView.ViewHolder source, int from, RecyclerView.ViewHolder target, int to) {                Log.d(TAG, "move from: " + source.getAdapterPosition() + " to: " + target.getAdapterPosition());            }                        //itme拖动结束            @Override            public void onItemDragEnd(RecyclerView.ViewHolder viewHolder, int pos) {                Log.d(TAG, "drag end");                BaseViewHolder holder = ((BaseViewHolder) viewHolder);//                holder.setTextColor(R.id.tv, Color.BLACK);            }        };        final Paint paint = new Paint();        paint.setAntiAlias(true);        paint.setTextSize(20);        paint.setColor(Color.BLACK);        OnItemSwipeListener onItemSwipeListener = new OnItemSwipeListener() {            @Override            public void onItemSwipeStart(RecyclerView.ViewHolder viewHolder, int pos) {                Log.d(TAG, "view swiped start: " + pos);                BaseViewHolder holder = ((BaseViewHolder) viewHolder);//                holder.setTextColor(R.id.tv, Color.WHITE);            }            @Override            public void clearView(RecyclerView.ViewHolder viewHolder, int pos) {                Log.d(TAG, "View reset: " + pos);                BaseViewHolder holder = ((BaseViewHolder) viewHolder);//                holder.setTextColor(R.id.tv, Color.BLACK);            }            @Override            public void onItemSwiped(RecyclerView.ViewHolder viewHolder, int pos) {                Log.d(TAG, "View Swiped: " + pos);            }            @Override            public void onItemSwipeMoving(Canvas canvas, RecyclerView.ViewHolder viewHolder, float dX, float dY, boolean isCurrentlyActive) {                canvas.drawColor(ContextCompat.getColor(ItemDragAndSwipeUseActivity.this, R.color.color_light_blue));//                canvas.drawText("Just some text", 0, 40, paint);            }        };        mAdapter = new ItemDragAdapter(mData);        mItemDragAndSwipeCallback = new ItemDragAndSwipeCallback(mAdapter);//在adapter上进行操作        mItemTouchHelper = new ItemTouchHelper(mItemDragAndSwipeCallback);//绑定mItemDragAndSwipeCallback        mItemTouchHelper.attachToRecyclerView(mRecyclerView);//mItemTouchHelper绑定到recyclerview        //mItemDragAndSwipeCallback.setDragMoveFlags(ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT | ItemTouchHelper.UP | ItemTouchHelper.DOWN);        mItemDragAndSwipeCallback.setSwipeMoveFlags(ItemTouchHelper.START | ItemTouchHelper.END);//设置左右删除item        mAdapter.enableSwipeItem();//刷新结束回调        mAdapter.setOnItemSwipeListener(onItemSwipeListener);//绑定onItemSwipeListener        mAdapter.enableDragItem(mItemTouchHelper);//绑定mItemTouchHelper        mAdapter.setOnItemDragListener(listener);//        mRecyclerView.addItemDecoration(new GridItemDecoration(this ,R.drawable.list_divider));        mRecyclerView.setAdapter(mAdapter);//        mRecyclerView.addOnItemTouchListener(new OnItemClickListener() {//            @Override//            public void onSimpleItemClick(final BaseQuickAdapter adapter, final View view, final int position) {//                ToastUtils.showShortToast("点击了" + position);//            }//        });        mAdapter.setOnItemClickListener(new BaseQuickAdapter.OnItemClickListener() {            @Override            public void onItemClick(BaseQuickAdapter adapter, View view, int position) {                ToastUtils.showShortToast("点击了" + position);            }        });    }    private List<String> generateData(int size) {        ArrayList<String> data = new ArrayList<>(size);        for (int i = 0; i < size; i++) {            data.add("item " + i);        }        return data;    }}

public class ItemDragAdapter extends BaseItemDraggableAdapter<String, BaseViewHolder> {    public ItemDragAdapter(List data) {        super(R.layout.item_draggable_view, data);    }    @Override    protected void convert(BaseViewHolder helper, String item) {        switch (helper.getLayoutPosition() %                3) {            case 0:                helper.setImageResource(R.id.iv_head, R.mipmap.head_img0);                break;            case 1:                helper.setImageResource(R.id.iv_head, R.mipmap.head_img1);                break;            case 2:                helper.setImageResource(R.id.iv_head, R.mipmap.head_img2);                break;        }        helper.setText(R.id.tv, item);    }}

如果要使用动画直接调用

mAnimationAdapter.openLoadAnimation();

这个方法即可
3.实现多级联动
实现多级联动必须让JavaBean继承AbstaractExpandaleItem<T>类（这里T写的是你的下一级的JavaBean类）和继承接口，要实现多少级由自己决定

一级标题类

public class Level0Item extends AbstractExpandableItem<Level1Item> implements MultiItemEntity {    public String title;    public String subTitle;    public Level0Item( String title, String subTitle) {        this.subTitle = subTitle;        this.title = title;    }    @Override    public int getItemType() {        return ExpandableItemAdapter.TYPE_LEVEL_0;    }    @Override    public int getLevel() {        return 0;    }}

二级标题类

public class Level1Item extends AbstractExpandableItem<Person> implements MultiItemEntity{    public String title;    public String subTitle;    public Level1Item(String title, String subTitle) {        this.subTitle = subTitle;        this.title = title;    }    @Override    public int getItemType() {        return ExpandableItemAdapter.TYPE_LEVEL_1;    }    @Override    public int getLevel() {        return 1;    }}

三级内容

public class Person implements MultiItemEntity{    public Person(String name, int age) {        this.age = age;        this.name = name;    }    public String name;    public int age;    @Override    public int getItemType() {        return ExpandableItemAdapter.TYPE_PERSON;    }}

使用代码：

public class ExpandableUseActivity extends BaseActivity {    RecyclerView mRecyclerView;    ExpandableItemAdapter adapter;    ArrayList<MultiItemEntity> list;//创建一个父类MultiItemEntity    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setBackBtn();        setTitle("ExpandableItem Activity");        setContentView(R.layout.activity_expandable_item_use);        mRecyclerView = (RecyclerView) findViewById(R.id.rv);        list = generateData();        adapter = new ExpandableItemAdapter(list);        final GridLayoutManager manager = new GridLayoutManager(this, 3);        manager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {//设置recyclerview的显示格式            @Override            public int getSpanSize(int position) {                /**                 * 如果adapter.getItemViewType(position)获得类型==ExpandableItemAdapter.TYPE_PERSON时就返回1：表示recyclerview只显示一列，否则显示manager.getSpanCount()这么多列                 */                return adapter.getItemViewType(position) == ExpandableItemAdapter.TYPE_PERSON ? 1 : manager.getSpanCount();            }        });        mRecyclerView.setAdapter(adapter);        // important! setLayoutManager should be called after setAdapter        mRecyclerView.setLayoutManager(manager);        adapter.expandAll();    }    private ArrayList<MultiItemEntity> generateData() {        int lv0Count = 9;        int lv1Count = 3;        int personCount = 5;        String[] nameList = {"Bob", "Andy", "Lily", "Brown", "Bruce"};        Random random = new Random();        ArrayList<MultiItemEntity> res = new ArrayList<>();        for (int i = 0; i < lv0Count; i++) {//添加一级标题内容            Level0Item lv0 = new Level0Item("This is " + i + "th item in Level 0", "subtitle of " + i);            for (int j = 0; j < lv1Count; j++) {//添加二级标题                Level1Item lv1 = new Level1Item("Level 1 item: " + j, "(no animation)");                for (int k = 0; k < personCount; k++) {//三级内容                    lv1.addSubItem(new Person(nameList[k], random.nextInt(40)));//将三级内容联动到二级下                }                lv0.addSubItem(lv1);//将二级标题联动到一级标题下            }            res.add(lv0);//最后添加到ArrayList<MultiItemEntity> res = new ArrayList<>();中        }        return res;    }}

adapter

public class ExpandableItemAdapter extends BaseMultiItemQuickAdapter<MultiItemEntity, BaseViewHolder> {    private static final String TAG = ExpandableItemAdapter.class.getSimpleName();    public static final int TYPE_LEVEL_0 = 0;    public static final int TYPE_LEVEL_1 = 1;    public static final int TYPE_PERSON = 2;    /**     * Same as QuickAdapter#QuickAdapter(Context,int) but with     * some initialization data.     *     * @param data A new list is created out of this one to avoid mutable list     */    public ExpandableItemAdapter(List<MultiItemEntity> data) {//为其设置三级标题类型        super(data);        addItemType(TYPE_LEVEL_0, R.layout.item_expandable_lv0);        addItemType(TYPE_LEVEL_1, R.layout.item_expandable_lv1);        addItemType(TYPE_PERSON, R.layout.item_expandable_lv2);    }    @Override    protected void convert(final BaseViewHolder holder, final MultiItemEntity item) {        switch (holder.getItemViewType()) {            case TYPE_LEVEL_0://一级标题                switch (holder.getLayoutPosition() %                        3) {                    case 0:                        holder.setImageResource(R.id.iv_head, R.mipmap.head_img0);                        break;                    case 1:                        holder.setImageResource(R.id.iv_head, R.mipmap.head_img1);                        break;                    case 2:                        holder.setImageResource(R.id.iv_head, R.mipmap.head_img2);                        break;                }                //绑定数据                final Level0Item lv0 = (Level0Item)item;                holder.setText(R.id.title, lv0.title)                        .setText(R.id.sub_title, lv0.subTitle)                        .setImageResource(R.id.iv, lv0.isExpanded() ? R.mipmap.arrow_b : R.mipmap.arrow_r);                holder.itemView.setOnClickListener(new View.OnClickListener() {                    @Override                    public void onClick(View v) {                        int pos = holder.getAdapterPosition();                        Log.d(TAG, "Level 0 item pos: " + pos);                        if (lv0.isExpanded()) {                            collapse(pos);                        } else {//                            if (pos % 3 == 0) {//                                expandAll(pos, false);//                            } else {                                expand(pos);//                            }                        }                    }                });                break;            case TYPE_LEVEL_1://二级同理                final Level1Item lv1 = (Level1Item)item;                holder.setText(R.id.title, lv1.title)                        .setText(R.id.sub_title, lv1.subTitle)                        .setImageResource(R.id.iv, lv1.isExpanded() ? R.mipmap.arrow_b : R.mipmap.arrow_r);                holder.itemView.setOnClickListener(new View.OnClickListener() {                    @Override                    public void onClick(View v) {                        int pos = holder.getAdapterPosition();                        Log.d(TAG, "Level 1 item pos: " + pos);                        if (lv1.isExpanded()) {                            collapse(pos, false);                        } else {                            expand(pos, false);                        }                    }                });                break;            case TYPE_PERSON://三级                final Person person = (Person)item;                holder.setText(R.id.tv, person.name + " parent pos: " + getParentPosition(person));                holder.itemView.setOnClickListener(new View.OnClickListener() {                    @Override                    public void onClick(View view) {                        int cp = getParentPosition(person);                        ((Level1Item)getData().get(cp)).removeSubItem(person);                        getData().remove(holder.getLayoutPosition());                        notifyItemRemoved(holder.getLayoutPosition());                    }                });                break;        }    }}

4.多布局的实现
首先JavaBean类继承MultiItemEntity接口重写getItemType（）方法这里返回的就是布局的类型，可以根据JavaBean中的type来实现不同布局

public class Person implements MultiItemEntity{    private String name;    private String age;    private int img;    private int type;    public Person(String name, String age, int img) {        this.name = name;        this.age = age;        this.img = img;    }    public Person(String name, String age, int img, int type) {        this.name = name;        this.age = age;        this.img = img;        this.type = type;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getAge() {        return age;    }    public void setAge(String age) {        this.age = age;    }    public int getImg() {        return img;    }    public void setImg(int img) {        this.img = img;    }    public int getType() {        return type;    }    public void setType(int type) {        this.type = type;    }    @Override    public int getItemType() {        return this.type;//type根据上面的构造函数来传入不通的值实现多类型的实现    }}

重写Adapter类继承BaseMultiItemQuickAdapter

public class PerserAapter extends BaseMultiItemQuickAdapter<Person, BaseViewHolder> {    /**     * 定义不同布局的类型ID     */    public static final int TYPE_HEAD = 0;    public static final int TYPE_MIDDLE = 1;    public static final int TYPE_FOOT = 2;    public PerserAapter(List<Person> data) {        super(data);        /**         * 根据不同类型ID实现不同布局，后面跟上的就是不同的布局         */        addItemType(TYPE_HEAD, R.layout.item1);        addItemType(TYPE_MIDDLE, R.layout.item2);        addItemType(TYPE_FOOT, R.layout.item3);    }    @Override    protected void convert(BaseViewHolder helper, Person item) {        /***         * 获取类型值来绑定数据         */        switch (helper.getItemViewType()) {            case TYPE_HEAD:                helper.setText(R.id.name,item.getName()).setText(R.id.age,item.getAge());                break;            case TYPE_MIDDLE:                helper.setText(R.id.name,item.getName()).setText(R.id.age,item.getAge());                break;            case TYPE_FOOT:                helper.setText(R.id.name,item.getName()).setText(R.id.age,item.getAge());                break;        }    }}

public class MainActivity extends AppCompatActivity {    private RecyclerView mRecyclerView;    private PerserAapter mAapter;    private List<Person>mData;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mRecyclerView= (RecyclerView) findViewById(recycler);        GridLayoutManager gridLayoutManager=new GridLayoutManager(this,3);        mRecyclerView.setLayoutManager(gridLayoutManager);        gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {            @Override            public int getSpanSize(int position) {                if (position%2==0)                return 3;                return 1;            }        });        initData();        mAapter=new PerserAapter(mData);        mRecyclerView.setAdapter(mAapter);    }    private void initData() {        mData=new ArrayList<>();        for (int i = 0; i < 5; i++) {            Person person=new Person("nama"+i,"age"+i,0,PerserAapter.TYPE_HEAD);//初始化数据的同时传入类型ID            mData.add(person);        }        for (int i = 0; i < 2; i++) {            Person person=new Person("nama"+i,"age"+i,0,PerserAapter.TYPE_MIDDLE);            mData.add(person);        }        for (int i = 0; i < 3; i++) {            Person person = new Person("nama" + i, "age" + i, 0, PerserAapter.TYPE_FOOT);            mData.add(person);        }    }}