尚硅谷android企业级技术之-recyclerview

1、第 14 讲_RecyclerView1_创建 RecyclerViewDemo在 build.gradle 配置 RecyclerView 的库2_在布局文件写定义 RecyclerView3_在代码中实例化 RecyclerView 并且初始化数据1/* 数据集合compile com.android.support:recyclerview-v7:23.3.04_设置适配器（难点重点）1.定义适配器2public class MyAdapter extendsRecyclerView.Adapter private final Context context;private final

2、ArrayList datas;public MyAdapter(Context context,ArrayList datas)this.context = context;this.datas = datas;/*Overrideprotected void onCreate(Bundle savedInstane) super.onCreate(savedInstane); setContentView(R.layout.activity_main);recyclerview = (RecyclerView) findViewById(R.id.recyclerview); initDa

3、ta();/* 初始化数据*/private void initData() datas = new ArrayList();for (i = 0; i 100; i+) datas.add(Content + i);*/private ArrayList datas;3相当于 ListView 适配器中的 getView 的创建 holder 布局*pararentparam viewTypereturn*/Overridepublic MyViewHolder onCreateViewHolder(ViewGroup parent,viewType)View view = View.inf

4、late(context, R.layout.item_o, null); return new MyViewHolder(view);Overridepublic void onBindViewHolder(MyViewHolder holder,ition) holder.tv_text.setText(datas.get(ition); holder.iv_icon.setBackgroundResource(R.mipmap.ic_launcher);OverridepublicgetItemCount() return datas.size();class MyViewHolder

5、extends RecyclerView.ViewHolder private TextView tv_text; private ImageView iv_icon;public MyViewHolder(View itemView) super(itemView);tv_text = (TextView) itemView.findViewById(R.id.tv_text);iv_icon = (ImageView) itemView.findViewById(R.id.iv_icon);2.设置布局文件45_设置适配器-水平方向-竖直方向-网格-瀑布流6_设置分割线参照：5/设置分割线

6、-分割线需要自定义&还可以自定义分割线的样式/没有提供默认的分割线recyclerview.addItemDecoration(new DividerListItemDecoration(this, DividerListItemDecoration.VERTICAL_LIST);public class DividerListItemDecoration extends RecyclerView.ItemDecorationmyAdapter = new MyAdapter(this,datas);recyclerview.setAdapter(myAdapter);/*设置布局：第一个参数

7、：上下文第二参数：方向第三个参数：排序低到高还是高到低显示，false 是低到高显示*/LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);GridLayoutManager gridLayoutManager = new GridLayoutManager(this, 3,GridLayoutManager.VERTICAL, false);StaggeredGridLayoutManager staggeredGridLayo

8、utManager = new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.HORIZONTAL); recyclerview.setLayoutManager(linearLayoutManager);6private sic final ATTRS = new android.R.attr.listDivider;public sic finalHORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;public sic finalVERTICAL_LIST = LinearLay

9、outManager.VERTICAL;private Drawable mDivider; privatemOrienion;public DividerListItemDecoration(Context context,orienion) final TypedArray a = context.obtainStyledAttributes(ATTRS); mDivider = a.getDrawable(0);a.recycle();setOrienion(orienion);public void setOrienion(orienion) if (orienion != HORIZ

10、ONTAL_LIST & orienion != VERTICAL_LIST)throw new IllegalArgumentException(invalid orienion);mOrienion = orienion;Overridepublic void onDraw(Canvas c, RecyclerVierent) /Log.e(recyclerview - itemdecoration, onDraw();if (mOrienion = VERTICAL_LIST) drawVertical(c, parent); else drawHorizontal(c, parent)

11、;public void drawVertical(Canvas c, RecyclerVierent) 7finalleft = parent.getPaddingLeft();finalright = parent.getWidth() - parent.getPaddingRight();finalchildCount = parent.getChildCount();for (i = 0; i childCount; i+) final View child = parent.getChildAt(i); android.support.v7.widget.RecyclerView v

12、 = newandroid.support.v7.widget.RecyclerVierent.getContext();final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();finaltop = child.getBottom() + params.bottomMargin; finalbottom = top + mDivider.getrinsicHeight(); mDivider.setBounds(left, top, right, bottom);

13、mDivider.draw(c);public void drawHorizontal(Canvas c, RecyclerVierent) finaltop = parent.getPaddingTop();finalbottom = parent.getHeight() - parent.getPaddingBottom();finalchildCount = parent.getChildCount();for (i = 0; i childCount; i+) final View child = parent.getChildAt(i); final RecyclerView.Lay

14、outParams params =(RecyclerView.LayoutParams) child.getLayoutParams();finalleft = child.getRight() + params.rightMargin; finalright = left + mDivider.getrinsicHeight(); mDivider.setBounds(left, top, right, bottom); mDivider.draw(c);Overridepublic void getItemOffsets(Rect outRect,itemition, RecyclerV

15、iew parent) if (mOrienion = VERTICAL_LIST) outRect.set(0, 0, 0, mDivider.getrinsicHeight(); else outRect.set(0, 0, mDivider.getrinsicWidth(), 0);设置分割线样式在 styles.xml 样式文件中8color/colorPrimarycolor/colorPrimaryDarkcolor/colorAccentdrawable/divider_bgdrawable/divider_bg在 drawable 目录下的 divider_bg.xml7_自定

16、义设置item 的点击事件或者item 中某个控件的点击事件RecyclerView 默认是没有点击事件的，需要自定义点击事件用到知识点：接口，getLayoutition()9public class MyAdapter extends RecyclerView.Adapterprivate final Context context;private final ArrayList datas;/设置点击某个 item 的publicerface OnItemClickListenervoid onItemClick(View view,ition,String content);priva

17、te OnItemClickListener onItemClickListener;/*设置某条的param onItemClickListener*/public void setOnItemClickListener(OnItemClickListener onItemClickListener) this.onItemClickListener = onItemClickListener;/设置点击/设置点击某个 item 的publicerface OnImageViewClickListenervoid onImageViewClick(View view,ition);10pri

18、vate OnImageViewClickListener onImageViewClickListener;/*设置param onImageViewClickListener*/public void setOnImageViewClickListener(OnImageViewClickListener onImageViewClickListener) this.onImageViewClickListener = onImageViewClickListener;.class MyViewHolder extends RecyclerView.ViewHolder private T

19、extView tv_text; private ImageView iv_icon;public MyViewHolder(View itemView) super(itemView);tv_text = (TextView) itemView.findViewById(R.id.tv_text);iv_icon = (ImageView) itemView.findViewById(R.id.iv_icon);/设置点击事件itemView.setOnClickListener(new View.OnClickListener() Overridepublic void onClick(V

20、iew v) if(onItemClickListener != null)onItemClickListener.onItemClick(v,getLayoutition(),datas.get(getLayo utition(););/设置iv_icon.setOnClickListener(new View.OnClickListener() Overridepublic void onClick(View v) if(onImageViewClickListener != null)11onImageViewClickListener.onImageViewClick(v,getLay

21、outition(););在 Activity 中使用自定义的点击事件/设置点击 item 的点击事件myAdapter.setOnItemClickListener(new MyAdapter.OnItemClickListener() Overridepublic void onItemClick(View view,ition, String content) Toast.makeText(RecyclerViewActivity.this,content=+content+,-ition=+ition, Toast.LENGTH_SHORT).show(););/设置点击某张的点击事件

22、myAdapter.setOnImageViewClickListener(newMyAdapter.OnImageViewClickListener() Overridepublic void onImageViewClick(View view,ition) Toast.makeText(RecyclerViewActivity.this,ition=+ition+,view=+view.toString(), Toast.LENGTH_SHORT).show(););8_删除和增加数据1_在适配器中新增加添加和删除两个方法2_在布局文件中添加点击按钮如图：12public class M

23、yAdapter extends RecyclerView.Adapter./*添加数据parositionparam content*/public void addData(ition,String content) datas.add(ition,content); notifyItemInserted(ition);/*移除数据parosition*/public void removeData(ition) datas.remove(ition); notifyItemRemoved(ition);代码如下：133_点击事件14private void setLitener() btn_add.setOnClickListener(new View.OnClickListener() Overridepublic void onClick(View v) 9_设置删除某条和增加某条的动画没有设置的情况是默认有动画的，也可以自己设置15myAdapter.addData(