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RecyclerView 数据刷新的几种方式

时间：2017-06-07 14:37:59      阅读：546      评论：0      收藏：0      [点我收藏+]

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小结

  • 刷新全部可见的item，notifyDataSetChanged()
  • 刷新指定item，notifyItemChanged(int)
  • 从指定位置开始刷新指定个item，notifyItemRangeChanged(int,int)
  • 插入、移动一个并自动刷新，notifyItemInserted(int)、notifyItemMoved(int)、notifyItemRemoved(int)
  • 局部刷新，notifyItemChanged(int, Object)

Activity

  1. public class Notify_Activity extends Activity implements MyOnItemClickLitener {
  3. 	private RecyclerView mRecyclerView;
  4. 	private Notify_Adapter mAdapter;
  5. 	private ArrayList<PicUrls.BasicPicBean> beans;
  7. 	@Override
  8. 	protected void onCreate(Bundle savedInstanceState) {
  9. 		super.onCreate(savedInstanceState);
  10. 		setContentView(R.layout.activity_main);
  11. 		((SwipeRefreshLayout) findViewById(R.id.swipeLayout)).setEnabled(false);
  12. 		mRecyclerView = (RecyclerView) findViewById(R.id.rv);
  13. 		initList();
  14. 		initView();
  15. 	}
  16. 	
  17. 	protected void initView() {
  18. 		mAdapter = new Notify_Adapter(this, beans);
  19. 		mAdapter.setOnItemClickLitener(this);
  20. 		mRecyclerView.setAdapter(mAdapter);//设置adapter
  22. 		mRecyclerView.setLayoutManager(new GridLayoutManager(this, 3));//设置布局管理器
  23. 		mRecyclerView.setItemAnimator(new DefaultItemAnimator());//设置Item增加、移除动画
  24. 		mRecyclerView.addItemDecoration(new GridItemDecoration.Builder().spanCount(3)
  25. 				.spaceSize(1).mDivider(new ColorDrawable(0x88ff0000)).build());
  26. 	}
  28. 	private void initList() {
  29. 		beans = PicUrls.getPicList(PicUrls.BIG_BEANS_2);
  30. 		beans.get(0).name = "刷新当前，notifyItemChanged(int)";
  31. 		beans.get(1).name = "全部刷新，notifyDataSetChanged()";
  32. 		beans.get(2).name = "从此位置开始刷新2个，notifyItemRangeChanged";
  33. 		beans.get(3).name = "插入一个并自动刷新，notifyItemInserted";
  34. 		beans.get(4).name = "只更改数据源，这样当然不会刷新UI";
  35. 		beans.get(5).name = "插入一个并刷新当前，notifyItemChanged";
  36. 		beans.get(6).name = "局部刷新，tv";
  37. 		beans.get(7).name = "局部刷新，et";
  38. 		beans.get(8).name = "局部刷新，iv";
  39. 	}
  41. 	@Override
  42. 	public void onItemClick(View view, int position) {
  43. 		Toast.makeText(this, position + " 被点击了", Toast.LENGTH_SHORT).show();
  44. 		reInit(position);
  45. 	}
  46. 	
  47. 	@Override
  48. 	public void onItemLongClick(View view, int position) {
  49. 		Toast.makeText(this, position + "被长按了", Toast.LENGTH_SHORT).show();
  50. 	}
  52. 	private void reInit(int position) {
  53. 		switch (position) {
  54. 			default:
  55. 				mAdapter.notifyItemChanged(position);//刷新指定一个。一定会闪
  56. 				break;
  57. 			case 1:
  58. 				mAdapter.notifyDataSetChanged();//全部刷新。基本不会闪，刚开始个别可能会闪
  59. 				break;
  60. 			case 2:
  61. 				mAdapter.notifyItemRangeChanged(position, 2);//从指定位置开始刷新指定个。一定会闪
  62. 				break;
  63. 			case 3:
  64. 				beans.add(position, new PicUrls.BasicPicBean("http://img.mmjpg.com/2015/74/1.jpg", "新插入的图片1", 1));
  65. 				mAdapter.notifyItemInserted(position);//插入一个并刷新，正常
  66. 				break;
  67. 			case 4://只更改数据源，这样当然不会刷新UI
  68. 				beans.add(position, new PicUrls.BasicPicBean("http://img.mmjpg.com/2015/74/2.jpg", "新插入的图片2", 2));
  69. 				break;
  70. 			case 5://
  71. 				beans.add(position, new PicUrls.BasicPicBean("http://img.mmjpg.com/2015/74/3.jpg", "新插入的图片3", 3));
  72. 				mAdapter.notifyItemChanged(position);//这样只会导致当前item刷新，而不会刷新其他item，当然是不行的
  73. 				break;
  74. 			case 6:
  75. 				beans.set(position, beans.get(new Random().nextInt(beans.size())));
  76. 				mAdapter.notifyItemChanged(position, Notify_Adapter.NOTIFY_TV);//局部刷新
  77. 				break;
  78. 			case 7:
  79. 				beans.set(position, beans.get(new Random().nextInt(beans.size())));
  80. 				mAdapter.notifyItemChanged(position, Notify_Adapter.NOTIFY_ET);//局部刷新
  81. 				break;
  82. 			case 8:
  83. 				beans.set(position, beans.get(new Random().nextInt(beans.size())));
  84. 				mAdapter.notifyItemChanged(position, Notify_Adapter.NOTIFY_IV);//局部刷新
  85. 				break;
  86. 		}
  87. 	}
  88. }

Adapter

  1. public class Notify_Adapter extends RecyclerView.Adapter<Notify_Adapter.MyViewHolder> {
  2. 	private Context context;
  3. 	private List<PicUrls.BasicPicBean> mDatas;
  4. 	private MyOnItemClickLitener mOnItemClickLitener;
  5. 	public static final int NOTIFY_TV = 10086;
  6. 	public static final int NOTIFY_ET = 10087;
  7. 	public static final int NOTIFY_IV = 10088;
  9. 	public Notify_Adapter(Context context, List<PicUrls.BasicPicBean> mDatas) {
  10. 		this.context = context;
  11. 		this.mDatas = mDatas;
  12. 	}
  14. 	@Override
  15. 	public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
  16. 		return new MyViewHolder(LayoutInflater.from(context).inflate(R.layout.item_notify, parent, false));
  17. 	}
  19. 	@Override
  20. 	public void onBindViewHolder(MyViewHolder holder, int position) {
  21. 		//不使用
  22. 	}
  24. 	@Override
  25. 	public void onBindViewHolder(final MyViewHolder holder, int position, List payloads) {
  26. 		//payloads是从notifyItemChanged(int, Object)中，或从notifyItemRangeChanged(int, int, Object)中传进来的Object集合
  27. 		//如果payloads不为空并且viewHolder已经绑定了旧数据了，那么adapter会使用payloads参数进行布局刷新
  28. 		//如果payloads为空，adapter就会重新绑定数据，也就是刷新整个item
  29. 		PicUrls.BasicPicBean bean = mDatas.get(holder.getAdapterPosition());
  30. 		long time = System.currentTimeMillis() + bean.url.hashCode();
  31. 		String data = new SimpleDateFormat("HH:mm:ss", Locale.getDefault()).format(new Date(time));
  33. 		if (payloads.isEmpty()) {//为空，即不是调用notifyItemChanged(position,payloads)后执行的，也即在初始化时执行的
  34. 			holder.tv.setText(data);
  35. 			holder.et.setText(bean.name);
  36. 			Glide.with(context).load(bean.url)
  37. 					.dontAnimate()
  38. 					//.diskCacheStrategy(DiskCacheStrategy.NONE).skipMemoryCache(true)
  39. 					.into(holder.iv);
  40. 		} else if (payloads.size() > 0 && payloads.get(0) instanceof Integer) {
  41. 			//不为空，即调用notifyItemChanged(position,payloads)后执行的，可以在这里获取payloads中的数据进行局部刷新
  42. 			int type = (int) payloads.get(0);// 刷新哪个部分 标志位
  43. 			switch (type) {
  44. 				case NOTIFY_TV:
  45. 					holder.tv.setText(data);//只刷新tv
  46. 					break;
  47. 				case NOTIFY_ET:
  48. 					holder.et.setText(bean.name);//只刷新et
  49. 					break;
  50. 				case NOTIFY_IV:
  51. 					Glide.with(context).load(bean.url).dontAnimate().into(holder.iv);//只刷新iv
  52. 					break;
  53. 			}
  54. 		}
  56. 		// 如果设置了回调，则设置点击事件
  57. 		holder.itemView.setOnClickListener(new OnClickListener() {
  58. 			@Override
  59. 			public void onClick(View v) {
  60. 				if (mOnItemClickLitener != null) mOnItemClickLitener.onItemClick(holder.itemView, holder.getAdapterPosition());
  61. 			}
  62. 		});
  63. 		holder.itemView.setOnLongClickListener(new OnLongClickListener() {
  64. 			@Override
  65. 			public boolean onLongClick(View v) {
  66. 				if (mOnItemClickLitener != null) mOnItemClickLitener.onItemLongClick(holder.itemView, holder.getAdapterPosition());
  67. 				return false;
  68. 			}
  69. 		});
  70. 	}
  72. 	@Override
  73. 	public int getItemCount() {
  74. 		return mDatas.size();
  75. 	}
  77. 	/**
  78. 	 * 添加并更新数据，同时具有动画效果
  79. 	 */
  80. 	public void addDataAt(int position, PicUrls.BasicPicBean data) {
  81. 		mDatas.add(position, data);
  82. 		notifyItemInserted(position);//更新数据集，注意如果用adapter.notifyDataSetChanged()将没有动画效果
  83. 	}
  85. 	/**
  86. 	 * 移除并更新数据，同时具有动画效果
  87. 	 */
  88. 	public void removeDataAt(int position) {
  89. 		mDatas.remove(position);
  90. 		notifyItemRemoved(position);
  91. 	}
  93. 	public void setOnItemClickLitener(MyOnItemClickLitener mOnItemClickLitener) {
  94. 		this.mOnItemClickLitener = mOnItemClickLitener;
  95. 	}
  97. 	class MyViewHolder extends RecyclerView.ViewHolder {
  98. 		TextView tv;
  99. 		ImageView iv;
  100. 		EditText et;
  102. 		public MyViewHolder(View view) {
  103. 			super(view);
  104. 			tv = (TextView) view.findViewById(R.id.tv_name);
  105. 			iv = (ImageView) view.findViewById(R.id.iv_head);
  106. 			et = (EditText) view.findViewById(R.id.et_input);
  107. 		}
  108. 	}
  109. }

布局

  1. <?xml version="1.0" encoding="utf-8"?>
  2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  3.               android:layout_width="match_parent"
  4.               android:layout_height="wrap_content"
  5.               android:gravity="center_horizontal"
  6.               android:orientation="vertical">
  8.     <TextView
  9.         android:id="@+id/tv_name"
  10.         android:layout_width="wrap_content"
  11.         android:layout_height="wrap_content"
  12.         android:gravity="center"
  13.         android:text="0.00"
  14.         android:textColor="#00f"
  15.         android:textSize="13sp"/>
  17.     <ImageView
  18.         android:id="@+id/iv_head"
  19.         android:layout_width="match_parent"
  20.         android:layout_height="200dp"
  21.         android:scaleType="centerCrop"
  22.         android:src="@mipmap/ic_launcher"/>
  24.     <EditText
  25.         android:id="@+id/et_input"
  26.         android:layout_width="wrap_content"
  27.         android:layout_height="wrap_content"
  28.         android:gravity="center"
  29.         android:hint="包青天"
  30.         android:inputType="numberDecimal"
  31.         android:labelFor="@id/et_input"
  32.         android:maxLines="1"
  33.         android:minWidth="50dp"
  34.         android:textColor="#f00"
  35.         android:textSize="10sp"/>
  37. </LinearLayout>

获取图片集合

  1. public class PicUrls {
  2. 	private static final String HOST0 = "http://img1.mm131.com/pic/";//网站【http://www.mm131.com/】
  3. 	private static final String HOST1 = "http://img.mmjpg.com/";//网站【http://www.mmjpg.com/】
  4. 	private static final String HOST2 = "http://pic.meituba.com/uploads/allimg/";//网站【http://www.meituba.com/】
  6. 	public static final UrlBean BIG_BEANS_0 = new UrlBean.Builder()//http://pic.meituba.com/uploads/allimg/2015/10/23/220.jpg
  7. 			.host(HOST2).urlHeader("2015/10/23/").picIndexFrom(220).picCount(100).picDes("100张动漫卡通壁纸").build();
  8. 	public static final UrlBean BIG_BEANS_1 = new UrlBean.Builder()//http://pic.meituba.com/uploads/allimg/2017/03/27/121_5600.jpg
  9. 			.host(HOST2).urlHeader("2017/03/27/121_").picIndexFrom(5600).picCount(100).picDes("100张搞笑内涵图片").build();
  10. 	public static final UrlBean BIG_BEANS_2 = new UrlBean.Builder()//http://pic.meituba.com/uploads/allimg/2015/10/23/360.jpg
  11. 			.host(HOST2).urlHeader("2015/10/23/").picIndexFrom(360).picCount(750).picDes("750张性感美女图").build();
  12. 	public static final UrlBean BIG_BEANS_3 = new UrlBean.Builder()//http://pic.meituba.com/uploads/allimg/2016/03/25/43_20335.jpg
  13. 			.host(HOST2).urlHeader("2016/03/25/43_").picIndexFrom(20335).picCount(1400).picDes("1400张动漫卡通壁纸").build();
  15. 	private static final UrlBean[] simpleBeans = {
  16. 			//http://img1.mm131.com/pic/996/1.jpg
  17. 			new UrlBean.Builder().host(HOST0).urlHeader("996/").picCount(10).picDes("北影校花余雨高清写真图片").build(),
  18. 			new UrlBean.Builder().host(HOST0).urlHeader("2958/").picCount(10).picDes("童颜嫩妹桃子黑丝大尺度诱惑").build(),
  19. 			new UrlBean.Builder().host(HOST0).urlHeader("2939/").picCount(10).picDes("清纯少女刘奕宁酥胸覆白色内衣").build(),
  20. 			new UrlBean.Builder().host(HOST0).urlHeader("2343/").picCount(10).picDes("萌妹销魂写真身材惹火让人欲罢不能").build(),
  21. 			new UrlBean.Builder().host(HOST0).urlHeader("2935/").picCount(10).picDes("性感女神杨晨晨透视睡衣大胆秀乳").build(),
  23. 			//http://img.mmjpg.com/2015/444/1.jpg
  24. 			new UrlBean.Builder().host(HOST1).urlHeader("2015/444/").picCount(10).picDes("模范学院美少女柳侑绮制服大片").build(),
  25. 			new UrlBean.Builder().host(HOST1).urlHeader("2015/74/").picCount(10).picDes("极品女神可儿私拍秀完美身材").build(),
  26. 			new UrlBean.Builder().host(HOST1).urlHeader("2017/990/").picCount(10).picDes("香艳妹子雪白的美胸绝对让你大饱眼福").build(),
  27. 			new UrlBean.Builder().host(HOST1).urlHeader("2017/962/").picCount(10).picDes("真诱人啊!女神雪白的美胸看着很有感觉").build(),
  28. 			new UrlBean.Builder().host(HOST1).urlHeader("2017/936/").picCount(10).picDes("身材娇美纯天然美女小叶子美胸艺术照").build(),
  30. 			//http://pic.meituba.com/uploads/allimg/2015/10/23/247.jpg
  31. 			new UrlBean.Builder().host(HOST2).urlHeader("2015/10/23/").picIndexFrom(247).picCount(10).picDes("呆萌可爱的哆啦A梦动漫").build(),
  32. 			new UrlBean.Builder().host(HOST2).urlHeader("2016/03/25/43_").picIndexFrom(20574).picCount(10).picDes("海贼王红发香克斯").build(),
  33. 			new UrlBean.Builder().host(HOST2).urlHeader("2016/03/25/44_").picIndexFrom(11275).picCount(10).picDes("英雄联盟游戏图片").build(),
  34. 			new UrlBean.Builder().host(HOST2).urlHeader("2016/07/30/43_").picIndexFrom(485).picCount(10).picDes("精选超萌小猫咪").build(),
  35. 			new UrlBean.Builder().host(HOST2).urlHeader("2016/09/08/43_").picIndexFrom(476).picCount(10).picDes("可爱快乐的女孩动漫").build(),
  36. 	};
  38. 	//******************************************************************************************
  40. 	/**
  41. 	 * 10*15张各种各样的带有描述的图片
  42. 	 */
  43. 	public static ArrayList<BasicPicBean> getPicList() {
  44. 		List<UrlBean> urlList = Arrays.asList(simpleBeans);
  46. 		ArrayList<BasicPicBean> picList = new ArrayList<>();
  47. 		for (UrlBean bean : urlList) {
  48. 			picList.addAll(getPicList(bean));
  49. 		}
  50. 		return picList;
  51. 	}
  53. 	/**
  54. 	 * 每一个UrlBean都有超多图片，多的有几千张
  55. 	 */
  56. 	public static ArrayList<BasicPicBean> getPicList(UrlBean bean) {
  57. 		ArrayList<BasicPicBean> picList = new ArrayList<>();
  58. 		for (int i = 0; i < bean.picCount; i++) {
  59. 			String picIndex = "" + (bean.picIndexFrom + i);
  60. 			for (int j = picIndex.length(); j < bean.minLength; j++) {
  61. 				if (picIndex.length() < bean.minLength) {
  62. 					picIndex = "0" + picIndex;
  63. 				} else break;
  64. 			}
  65. 			String picUrl = bean.host + bean.urlHeader + picIndex + bean.urlEnder;//例如.../1.jpg
  66. 			String picDes = bean.picDes + "-" + i;
  67. 			picList.add(new BasicPicBean(picUrl, picDes, i));
  68. 		}
  69. 		return picList;
  70. 	}
  72. 	//******************************************************************************************
  73. 	static class UrlBean {
  74. 		public String picDes;//图片描述
  75. 		public String host;//存放图片的主机地址
  76. 		public String urlHeader;
  77. 		public String urlEnder;//默认为= ".jpg"
  78. 		public int picCount;//此系列图片的数量。所有图片都是以数字命名的，比如1.jpg、2.jpg
  79. 		public int picIndexFrom;//此系列图片开始的序号位置，默认为1
  80. 		public int minLength;//如，当为1.jpg时实际为01.jpg或001.jpg
  82. 		private UrlBean(Builder builder) {
  83. 			picDes = builder.picDes;
  84. 			host = builder.host;
  85. 			urlHeader = builder.urlHeader;
  86. 			urlEnder = builder.urlEnder;
  87. 			picCount = builder.picCount;
  88. 			picIndexFrom = builder.picIndexFrom;
  89. 			minLength = builder.minLength;
  90. 		}
  92. 		static final class Builder {
  93. 			private String picDes = "包青天作品";
  94. 			private String host = "";
  95. 			private String urlHeader = "";
  96. 			private String urlEnder = ".jpg";//默认为".jpg"
  97. 			private int picCount = 1;
  98. 			private int picIndexFrom = 1;
  99. 			private int minLength = 0;
  101. 			public Builder() {
  102. 			}
  104. 			public Builder urlHeader(String val) {
  105. 				urlHeader = val;
  106. 				return this;
  107. 			}
  109. 			public Builder urlEnder(String val) {
  110. 				urlEnder = val;
  111. 				return this;
  112. 			}
  114. 			public Builder picCount(int val) {
  115. 				picCount = val;
  116. 				return this;
  117. 			}
  119. 			public Builder picIndexFrom(int val) {
  120. 				picIndexFrom = val;
  121. 				return this;
  122. 			}
  124. 			public Builder minLength(int val) {
  125. 				minLength = val;
  126. 				return this;
  127. 			}
  129. 			public Builder host(String val) {
  130. 				host = val;
  131. 				return this;
  132. 			}
  134. 			public Builder picDes(String val) {
  135. 				picDes = val;
  136. 				return this;
  137. 			}
  139. 			public UrlBean build() {
  140. 				return new UrlBean(this);
  141. 			}
  142. 		}
  143. 	}
  145. 	//******************************************************************************************
  147. 	public static class BasicPicBean {
  148. 		public String url;
  149. 		public String name;
  150. 		public int index;
  152. 		public BasicPicBean(String url, String name, int index) {
  153. 			this.url = url;
  154. 			this.name = name;
  155. 			this.index = index;
  156. 		}
  157. 	}
  158. }
2017-6-7




RecyclerView 数据刷新的几种方式

标签：数据集   new   hang   ring   tin   插入   sim   com   strategy   

原文地址：http://www.cnblogs.com/baiqiantao/p/6956425.html
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