28.Android 十分方便的EasyRecyclerView

Android 十分方便的EasyRecyclerView
- 前言
- 无限被放大的优点
- Gradle
- Adapter
- EasyRecyclerView
- Decoration
- EasyDividerItemDecorationActivity
- RecyclerView设置布局管理器
- RecyclerView设置Item动画
- 效果图
- Github传送门

前言

如果你的非常喜欢Android技术，并不止把它当作一项工作，那么这里统称为“我们”。

我们很早就都知道： RecyclerView的存在是为了取代ListView 。

无限被放大的优点

1.规范了ViewHolder，把ViewHolder封装起来，并让我们继承这个抽象类RecyclerView.ViewHolder。
2.把ItemView存放到RecyclerView.ViewHolder，通过复用RecyclerView.ViewHolder实现ItemView的复用。
3.RecyclerView.Adapter

Gradle

dependencies {compile 'com.camnter.easyrecyclerview:easyrecyclerview:1.1.0'
}

Adapter

测试用的EasyDividerItemDecorationAdapter。

public class EasyDividerItemDecorationAdapter extends EasyRecyclerViewAdapter {private static final int MULTIPLE_ITEM_TYPE = 0;private static final int SINGLE_ITEM_TYPE = 1;/*** Please return RecyclerView loading layout Id array* 请返回RecyclerView加载的布局Id数组** @return 布局Id数组*/@Overridepublic int[] getItemLayouts() {return new int[]{R.layout.item_recyclerview_multiple, R.layout.item_recyclerview_single};}/*** butt joint the onBindViewHolder and* If you want to write logic in onBindViewHolder, you can write here* 对接了onBindViewHolder* onBindViewHolder里的逻辑写在这** @param viewHolder viewHolder* @param position position*/@Overridepublic void onBindRecycleViewHolder(EasyRecyclerViewHolder viewHolder, int position) {int itemType = this.getRecycleViewItemType(position);EasyRecyclerViewData data = this.getItem(position);switch (itemType) {case MULTIPLE_ITEM_TYPE: {TextView multipleTV = viewHolder.findViewById(R.id.recycler_view_mul_tv);ImageView multipleIV = viewHolder.findViewById(R.id.recycler_view_mul_iv);multipleTV.setText(data.content);multipleIV.setImageResource(data.imageResId);break;}case SINGLE_ITEM_TYPE: {ImageView singleIV = viewHolder.findViewById(R.id.recycler_view_single_iv);singleIV.setImageResource(data.imageResId);break;}}}/*** Please write judgment logic when more layout* and not write when single layout* 如果是多布局的话，请写判断逻辑* 单布局可以不写** @param position Item position* @return 布局Id数组中的index*/@Overridepublic int getRecycleViewItemType(int position) {if (position % 2 == 0) {return SINGLE_ITEM_TYPE;} else {return MULTIPLE_ITEM_TYPE;}}}

EasyRecyclerView

默认配置如下 :

LayoutMannager ＝ LinearLayoutManager
ItemAnimator ＝ DefaultItemAnimator

你可以修改成你想要的LayoutManager和ItemAnimator。

EasyRecyclerView recyclerView = (EasyRecyclerView) this.findViewById(R.id.recycler_view);
this.myRecycleViewAdapter = new MyRecycleViewAdapter();
recyclerView.setAdapter(this.myRecycleViewAdapter);// set divider
recyclerView.addItemDecoration(new EasyDividerItemDecoration(this,EasyDividerItemDecoration.VERTICAL_LIST,R.drawable.bg_recycler_view_divider)
);

Decoration

提供了两种Decoration：

EasyDividerItemDecoration
EasyBorderDividerItemDecoration

EasyDividerItemDecorationActivity

就贴几个类的源码，等会看到效果图，就知道不需要我贴布局文件了。因为：很简单。

EasyDividerItemDecorationActivity

public class EasyDividerItemDecorationActivity extends AppCompatActivity {private EasyDividerItemDecorationAdapter easyDividerItemDecorationAdapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_divider);EasyRecyclerView recyclerView = (EasyRecyclerView) this.findViewById(R.id.recycler_view);this.easyDividerItemDecorationAdapter = new EasyDividerItemDecorationAdapter();recyclerView.setAdapter(this.easyDividerItemDecorationAdapter);// set dividerrecyclerView.addItemDecoration(new EasyDividerItemDecoration(this,EasyDividerItemDecoration.VERTICAL_LIST,R.drawable.bg_recycler_view_divider));this.initData();}private void initData() {ArrayList<EasyRecyclerViewData> allData = new ArrayList<>();for (int i = 1; i <= 6; i++) {EasyRecyclerViewData dataSingle = new EasyRecyclerViewData();EasyRecyclerViewData dataMultiple = new EasyRecyclerViewData();String mipmapName = "mm_" + i;int mipmapId = this.getMipmapId(this, mipmapName);dataSingle.imageResId = mipmapId;dataMultiple.content = "Save you from anything " + "26" + "-" + i;dataMultiple.imageResId = mipmapId;allData.add(dataSingle);allData.add(dataMultiple);}this.easyDividerItemDecorationAdapter.setList(allData);this.easyDividerItemDecorationAdapter.notifyDataSetChanged();}public int getMipmapId(Context context, String mipmapName) {return context.getResources().getIdentifier(mipmapName,"mipmap", context.getPackageName());}}

RecyclerView设置布局管理器

RecyclerView.setLayoutManager(LayoutManager layout)

RecyclerView有三种布局方式：
- LinearLayoutManager（线性布局）
- GridLayoutManager（网格布局）
- StaggeredGridLayoutManager（瀑布流网格布局）

RecyclerView设置Item动画

RecyclerView.setItemAnimator(ItemAnimator animator)

一般默认提供了一个new DefaultItemAnimator()。当然我们还可以自定义Item动画。

有一个意大利大神写的RecyclerViewItemAnimators

效果图

EasyDividerItemDecoration

EasyBorderDividerItemDecoration

Github传送门

EasyRecyclerView