Android RecyclerView的notify方法和动画的刷新详解

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前言：

本篇讲解了RecyclerView关于通知列表刷新的常用的notify方法。和RecyclerView动画的简单详解。

首先看下效果图

在这里插入图片描述

1、页面对应的xml代码如下：

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools">

    <data>

        <variable
            name="presenter"
            type="com.example.customview.ui.RecyclerViewActivity.Presenter" />
    </data>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        tools:context=".ui.RecyclerViewActivity">

        <androidx.constraintlayout.widget.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <Button
                android:id="@+id/btn_reset"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="@{(view)->presenter.onClick(view)}"
                android:text="重置"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

            <Button
                android:id="@+id/btn_refresh_all"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="@{(view)->presenter.onClick(view)}"
                android:text="全部刷新"
                app:layout_constraintStart_toEndOf="@id/btn_reset"
                app:layout_constraintTop_toTopOf="parent" />

            <Button
                android:id="@+id/btn_refresh_2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="@{(view)->presenter.onClick(view)}"
                android:text="刷新第2条"
                app:layout_constraintStart_toEndOf="@id/btn_refresh_all"
                app:layout_constraintTop_toTopOf="parent" />

            <Button
                android:id="@+id/btn_refresh_234"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="@{(view)->presenter.onClick(view)}"
                android:text="刷新第2,3,4条"
                app:layout_constraintStart_toEndOf="@id/btn_refresh_2"
                app:layout_constraintTop_toTopOf="parent" />

            <Button
                android:id="@+id/btn_part_refresh_2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="@{(view)->presenter.onClick(view)}"
                android:text="局部刷新第2条"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@id/btn_reset" />

            <Button
                android:id="@+id/btn_part_refresh_234"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="@{(view)->presenter.onClick(view)}"
                android:text="局部刷新第2,3,4条"
                app:layout_constraintStart_toEndOf="@+id/btn_part_refresh_2"
                app:layout_constraintTop_toBottomOf="@id/btn_reset" />

            <Button
                android:id="@+id/btn_insert_1_1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="@{(view)->presenter.onClick(view)}"
                android:text="位置1插入一条"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@id/btn_part_refresh_234" />

            <Button
                android:id="@+id/btn_insert_3_2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="@{(view)->presenter.onClick(view)}"
                android:text="位置3插入两条"
                app:layout_constraintStart_toEndOf="@id/btn_insert_1_1"
                app:layout_constraintTop_toBottomOf="@id/btn_part_refresh_234" />

            <Button
                android:id="@+id/btn_move_2_4"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="@{(view)->presenter.onClick(view)}"
                android:text="2移到4(都指的是索引)"
                app:layout_constraintStart_toEndOf="@id/btn_insert_3_2"
                app:layout_constraintTop_toBottomOf="@id/btn_part_refresh_234" />

            <Button
                android:id="@+id/btn_remove_2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="@{(view)->presenter.onClick(view)}"
                android:text="删除第2条"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@id/btn_move_2_4" />

            <Button
                android:id="@+id/btn_remove_234"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="@{(view)->presenter.onClick(view)}"
                android:text="删除第2,3,4条"
                app:layout_constraintStart_toEndOf="@id/btn_remove_2"
                app:layout_constraintTop_toBottomOf="@id/btn_move_2_4" />
        </androidx.constraintlayout.widget.ConstraintLayout>

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/rv_list"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:overScrollMode="never"
            android:scrollbars="none" />
    </LinearLayout>
</layout>

2、对应的适配器代码如下

/**
 * @Author: ly
 * @Date: 2023/3/9
 * @Description: 适配器
 */
public class NotifyDataAdapter extends RecyclerView.Adapter<NotifyDataAdapter.NotifyDataViewHolder> {
    private List<NotifyModel> notifyModels = new ArrayList<>();

    public NotifyDataAdapter(List<NotifyModel> notifyModels) {
        this.notifyModels = notifyModels;
    }

    @NonNull
    @Override
    public NotifyDataViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        ItemNotifyDataBinding binding = DataBindingUtil.inflate(LayoutInflater.from(parent.getContext()), R.layout.item_notify_data, parent, false);
        Log.i("TAG", "onCreateViewHolder: ");
        return new NotifyDataViewHolder(binding);
    }

    @Override
    public void onBindViewHolder(@NonNull NotifyDataViewHolder holder, int position) {
        Log.i("TAG", "onBindViewHolder:两个参数 " + position);
        holder.bindData(position);
    }


    @Override
    public void onBindViewHolder(@NonNull NotifyDataViewHolder holder, int position, @NonNull List<Object> payloads) {
        Log.i("TAG", "onBindViewHolder:三个参数 " + position);
        if (payloads.isEmpty()) {/** payloads为空说明不需要局部刷新,走原有的onBindViewHolder(holder, position) */
            onBindViewHolder(holder, position);
        } else {
            for (Object o : payloads) {
                String payload = (String) o;
                if ("title".equals(payload)) { /** 只刷新title字段 */
                    holder.binding.tvTitle.setText(notifyModels.get(position).getTitle());
                } else if ("content".equals(payload)) {/** 只刷新content字段 */
                    holder.binding.tvContent.setText(notifyModels.get(position).getContent());
                }
            }
        }
    }

    @Override
    public int getItemCount() {
        Log.i("TAG", "getItemCount: " + notifyModels.size());
        return notifyModels.size();
    }

    @Override
    public int getItemViewType(int position) {
        Log.i("TAG", "getItemViewType: " + position);
        return super.getItemViewType(position);
    }

    public class NotifyDataViewHolder extends RecyclerView.ViewHolder {
        ItemNotifyDataBinding binding;

        public NotifyDataViewHolder(@NonNull ItemNotifyDataBinding itemView) {
            super(itemView.getRoot());
            binding = itemView;
        }

        public void bindData(int position) {
            binding.setModel(notifyModels.get(position));
        }
    }
}

Activity对应的代码如下，关于notify方法已经在注释中给出：

/**
 * @Author: ly
 * @Date: 2023/3/11
 * @Description: RecyclerView常用notify方法
 */
public class RecyclerViewActivity extends AppCompatActivity {
    private ActivityRecyclerViewBinding binding;
    private NotifyDataAdapter adapter;
    private List<NotifyModel> notifyModels = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = DataBindingUtil.setContentView(this, R.layout.activity_recycler_view);
        binding.setPresenter(new Presenter());
        initData();
//        binding.rvList.setItemAnimator(null);//去掉默认动画
//        binding.rvList.setItemAnimator(new SlideInLeftAnimator());
        binding.rvList.setLayoutManager(new LinearLayoutManager(this));
        adapter = new NotifyDataAdapter(notifyModels);
        binding.rvList.setAdapter(adapter);
    }

    private void initData() {
        notifyModels.clear();
        for (int i = 0; i < 5; i++) {
            notifyModels.add(new NotifyModel("第" + i + "个标题", "第" + i + "条详细内容,详细的信息"));
        }
    }

    public class Presenter {
        public void onClick(View view) {
            if (view == binding.btnReset) {
                reset();
            } else if (view == binding.btnRefreshAll) {
                notifyAllData();
            } else if (view == binding.btnRefresh2) {
                notify_2();
            } else if (view == binding.btnRefresh234) {
                notify_234();
            } else if (view == binding.btnPartRefresh2) {
                notifyPart_2();
            } else if (view == binding.btnPartRefresh234) {
                notifyPart_234();
            } else if (view == binding.btnInsert11) {
                insert_1_1();
            } else if (view == binding.btnInsert32) {
                insert_3_2();
            } else if (view == binding.btnMove24) {
                move_2_4();
            } else if (view == binding.btnRemove2) {
                remove2();
            } else if (view == binding.btnRemove234) {
                remove234();
            }
        }
    }

    /**
     * 删除索引为2,3,4条的数据
     */
    private void remove234() {
        for (NotifyModel model : notifyModels) {
            model.setTitle("remove234" + model.getTitle());
            model.setContent("remove234" + model.getContent());
        }
        NotifyModel model2 = notifyModels.get(2);
        NotifyModel model3 = notifyModels.get(3);
        NotifyModel model4 = notifyModels.get(4);
        notifyModels.remove(model2);
        notifyModels.remove(model3);
        notifyModels.remove(model4);
        //notifyItemRangeRemoved(int positionStart, int itemCount)
        //从positionStart位置，itemCount数量的数据进行删除
        adapter.notifyItemRangeRemoved(2, 3);
    }

    /**
     * 删除索引为2的条目数据
     */
    private void remove2() {
        for (NotifyModel model : notifyModels) {
            model.setTitle("remove2" + model.getTitle());
            model.setContent("remove2" + model.getContent());
        }
        notifyModels.remove(2);
        //notifyItemRemoved(int position)：列表position位置移除一条数据时调用。
        adapter.notifyItemRemoved(2);
    }

    /**
     * 2的位置移动到4
     */
    private void move_2_4() {
        for (NotifyModel model : notifyModels) {
            model.setTitle("move_2_4" + model.getTitle());
            model.setContent("move_2_4" + model.getContent());
        }
        //notifyItemMoved(int fromPosition, int toPosition)：将条目下标为fromPosition的位置
        //移动到toPosition位置时调用。
        adapter.notifyItemMoved(2, 4);
    }

    /**
     * 在索引位置为3的位置，添加了两条数据
     */
    private void insert_3_2() {
        for (NotifyModel model : notifyModels) {
            model.setTitle("insert_3_2" + model.getTitle());
            model.setContent("insert_3_2" + model.getContent());
        }
        NotifyModel model = new NotifyModel("insert_3_2 add 3", "insert_3_2 add 3");
        notifyModels.add(3, model);//在索引为3的位置，添加了一条数据
        NotifyModel model1 = new NotifyModel("insert_3_2 add 4", "insert_3_2 add 4");
        notifyModels.add(4, model1);//在索引为3的位置，添加了一条数据
        //notifyItemRangeInserted(int positionStart, int itemCount)
        //从指定的位置开始刷新，添加itemCount个数据
        adapter.notifyItemRangeInserted(3, 2);
    }

    /**
     * 索引为1处，插入1条数据
     */
    private void insert_1_1() {
        for (NotifyModel model : notifyModels) {
            model.setTitle("insert_1_1" + model.getTitle());
            model.setContent("insert_1_1" + model.getContent());
        }
        NotifyModel model = new NotifyModel("insert_1_1 add", "insert_1_1 add");
        notifyModels.add(1, model);//在索引为1的位置，添加了一条数据
        //notifyItemInserted(position):在position位置添加一条数据
        adapter.notifyItemInserted(1);
    }

    /**
     * 局部更新，下标为2开始的三条数据(包含2 那么其实就是2,3,4)
     */
    private void notifyPart_234() {
        for (NotifyModel model : notifyModels) {
            model.setTitle("notifyPart_234" + model.getTitle());
            model.setContent("notifyPart_234" + model.getContent());
        }
        NotifyModel model = new NotifyModel("notifyPart_234 add", "notifyPart_234 add");
        notifyModels.add(model);
        // notifyItemRangeChanged(int positionStart, int itemCount,
        //                @Nullable Object payload):从指定的位置开始刷新，指定个item
        //payload用来标记需要局部刷新的部分。
        adapter.notifyItemRangeChanged(2, 3, "content");
    }

    /**
     * 局部更新，更新下标索引为2的条目，刷新其中的一个字段
     */
    private void notifyPart_2() {
        for (NotifyModel model : notifyModels) {
            model.setTitle("notifyPart_2" + model.getTitle());
            model.setContent("notifyPart_2" + model.getContent());
        }
        NotifyModel model = new NotifyModel("notifyPart_2 add", "notifyPart_2 add");
        notifyModels.add(model);
        //notifyItemChanged(int position, @Nullable Object payload):刷新指定位置
        //payload用来标记需要局部刷新的部分。
        adapter.notifyItemChanged(2, "title");//只局部刷新下标为2的条目数据 数据又新增了一条，这时也会被加载出来。
    }

    /**
     * 刷新下标为2开始的三条数据(包含2 那么其实就是2,3,4)
     */
    private void notify_234() {
        for (NotifyModel model : notifyModels) {
            model.setTitle("notify_2" + model.getTitle());
            model.setContent("notify_2" + model.getContent());
        }
        NotifyModel model = new NotifyModel("notify_2 add", "notify_2 add");
        notifyModels.add(model);
        //notifyItemRangeChanged(int positionStart, int itemCount):从指定的位置开始刷新，指定个item
        //item传1等价于notifyItemChanged(position)
        adapter.notifyItemRangeChanged(2, 3);
    }

    /**
     * 刷新下标位置为2的条目数据
     */
    private void notify_2() {
        for (NotifyModel model : notifyModels) {
            model.setTitle("notify_2" + model.getTitle());
            model.setContent("notify_2" + model.getContent());
        }
        NotifyModel model = new NotifyModel("notify_2 add", "notify_2 add");
        notifyModels.add(model);
        //notifyItemChanged(position):刷新指定位置
        adapter.notifyItemChanged(2);//只刷新下标为2的条目数据 数据又新增了一条，这时也会被加载出来。
    }

    /**
     * 重置
     */
    private void reset() {
        initData();
        adapter.notifyDataSetChanged();
    }

    /**
     * 刷新全部
     */
    public void notifyAllData() {
        for (NotifyModel model : notifyModels) {
            model.setTitle("notifyAll" + model.getTitle());
            model.setContent("notifyAll" + model.getContent());
        }
        NotifyModel model = new NotifyModel("notifyAll add", "notifyAll add");
        notifyModels.add(model);
        adapter.notifyDataSetChanged();//刷新全部item
    }

}

下面是调用不同的notify方法适配器执行的方法顺序如下：
对应上文
1、执行notifyAllData(),实际调用的是 notifyDataSetChanged 刷新全部，适配器执行方法如下

getItemCount: 6
getItemCount: 6
getItemCount: 6
getItemViewType: 0
onBindViewHolder:三个参数
onBindViewHolder:两个参数
getItemCount: 6
getItemViewType: 1
onBindViewHolder:三个参数
onBindViewHolder:两个参数
getItemCount: 6
getItemViewType: 2
onBindViewHolder:三个参数
onBindViewHolder:两个参数
getItemCount: 6
getItemViewType: 3
onBindViewHolder:三个参数
onBindViewHolder:两个参数
getItemCount: 6
getItemViewType: 4
onBindViewHolder:三个参数
onBindViewHolder:两个参数
getItemCount: 6
getItemViewType: 5
onCreateViewHolder: 
onBindViewHolder:三个参数
onBindViewHolder:两个参数
getItemCount: 6
getItemCount: 6
getItemViewType: 0
getItemCount: 6
getItemViewType: 1
getItemCount: 6
getItemViewType: 2
getItemCount: 6
getItemViewType: 3
getItemCount: 6
getItemViewType: 4
getItemCount: 6
getItemViewType: 5

2、执行notify_2(),实际调用的是 notifyItemChanged(2)，适配器执行方法如下

getItemCount: 6
getItemCount: 6
getItemViewType: 0
getItemCount: 6
getItemViewType: 1
getItemCount: 6
getItemViewType: 2
onCreateViewHolder: 
onBindViewHolder:三个参数
onBindViewHolder:两个参数
getItemCount: 6
getItemViewType: 3
getItemCount: 6
getItemViewType: 4
getItemCount: 6
getItemViewType: 5
onCreateViewHolder: 
onBindViewHolder:三个参数
onBindViewHolder:两个参数
getItemCount: 6
getItemCount: 6
getItemViewType: 0
getItemCount: 6
getItemViewType: 1
getItemCount: 6
getItemViewType: 2
getItemCount: 6
getItemViewType: 3
getItemCount: 6
getItemViewType: 4
getItemCount: 6
getItemViewType: 5

3、执行notify_234(),实际调用的是 notifyItemRangeChanged(2, 3);，适配器执行方法如下

 getItemCount: 6
 getItemCount: 6
 getItemViewType: 0
 getItemCount: 6
 getItemViewType: 1
 getItemCount: 6
 getItemViewType: 2
 onCreateViewHolder: 
 onBindViewHolder:三个参数
 onBindViewHolder:两个参数
 getItemCount: 6
 getItemViewType: 3
 onCreateViewHolder: 
 onBindViewHolder:三个参数
 onBindViewHolder:两个参数
 getItemCount: 6
 getItemViewType: 4
 onCreateViewHolder: 
 onBindViewHolder:三个参数
 onBindViewHolder:两个参数
 getItemCount: 6
 getItemViewType: 5
 onCreateViewHolder: 
 onBindViewHolder:三个参数
 onBindViewHolder:两个参数
 getItemCount: 6
 getItemCount: 6
 getItemViewType: 0
 getItemCount: 6
 getItemViewType: 1
 getItemCount: 6
 getItemViewType: 2
 getItemCount: 6
 getItemViewType: 3
 getItemCount: 6
 getItemViewType: 4
 getItemCount: 6
 getItemViewType: 5

4、执行notifyPart_2(),实际调用的是 notifyItemChanged(2, “title”);，适配器执行方法如下

getItemCount: 6
getItemCount: 6
getItemViewType: 0
getItemCount: 6
getItemViewType: 1
getItemCount: 6
getItemViewType: 2
onBindViewHolder:三个参数
getItemCount: 6
getItemViewType: 3
getItemCount: 6
getItemViewType: 4
getItemCount: 6
getItemViewType: 5
onCreateViewHolder: 
onBindViewHolder:三个参数
onBindViewHolder:两个参数
getItemCount: 6
getItemCount: 6
getItemViewType: 0
getItemCount: 6
getItemViewType: 1
getItemCount: 6
getItemViewType: 2
getItemCount: 6
getItemViewType: 3
getItemCount: 6
getItemViewType: 4
getItemCount: 6
getItemViewType: 5

5、执行notifyPart_234(),实际调用的是notifyItemRangeChanged(2, 3, “content”);，适配器执行方法如下

getItemCount: 6
getItemCount: 6
getItemViewType: 0
getItemCount: 6
getItemViewType: 1
getItemCount: 6
getItemViewType: 2
onBindViewHolder:三个参数
getItemCount: 6
getItemViewType: 3
onBindViewHolder:三个参数
getItemCount: 6
getItemViewType: 4
onBindViewHolder:三个参数
getItemCount: 6
getItemViewType: 5
onCreateViewHolder: 
onBindViewHolder:三个参数
onBindViewHolder:两个参数
getItemCount: 6
getItemCount: 6
getItemViewType: 0
getItemCount: 6
getItemViewType: 1
getItemCount: 6
getItemViewType: 2
getItemCount: 6
getItemViewType: 3
getItemCount: 6
getItemViewType: 4
getItemCount: 6
getItemViewType: 5

6、执行insert_1_1(),实际调用的是notifyItemInserted(1);，适配器执行方法如下

getItemCount: 6
getItemCount: 6
getItemViewType: 0
getItemCount: 6
getItemViewType: 1
onCreateViewHolder: 
onBindViewHolder:三个参数
onBindViewHolder:两个参数
getItemCount: 6
getItemViewType: 2
getItemCount: 6
getItemViewType: 3
getItemCount: 6
getItemViewType: 4
getItemCount: 6
getItemViewType: 5
getItemCount: 6
getItemCount: 6
getItemViewType: 0
getItemCount: 6
getItemViewType: 1
getItemCount: 6
getItemViewType: 2
getItemCount: 6
getItemViewType: 3
getItemCount: 6
getItemViewType: 4
getItemCount: 6
getItemViewType: 5

7、执行insert_3_2(),实际调用的是notifyItemRangeInserted(3, 2);，适配器执行方法如下

getItemCount: 7
getItemCount: 7
getItemViewType: 0
getItemCount: 7
getItemViewType: 1
getItemCount: 7
getItemViewType: 2
getItemCount: 7
getItemViewType: 3
onCreateViewHolder: 
onBindViewHolder:三个参数
onBindViewHolder:两个参数
getItemCount: 7
getItemViewType: 4
onCreateViewHolder: 
onBindViewHolder:三个参数
onBindViewHolder:两个参数
getItemCount: 7
getItemViewType: 5
getItemCount: 7
getItemViewType: 6
getItemCount: 7
getItemCount: 7
getItemViewType: 0
getItemCount: 7
getItemViewType: 1
getItemCount: 7
getItemViewType: 2
getItemCount: 7
getItemViewType: 3
getItemCount: 7
getItemViewType: 4
getItemCount: 7
getItemViewType: 5
getItemCount: 7
getItemViewType: 6

7、执行move_2_4(),实际调用的是notifyItemMoved(2, 4);，适配器执行方法如下

getItemCount: 5
getItemCount: 5
getItemViewType: 0
getItemCount: 5
getItemViewType: 1
getItemCount: 5
getItemViewType: 2
getItemCount: 5
getItemViewType: 3
getItemCount: 5
getItemViewType: 4
getItemCount: 5
getItemCount: 5
getItemViewType: 0
getItemCount: 5
getItemViewType: 1
getItemCount: 5
getItemViewType: 2
getItemCount: 5
getItemViewType: 3
getItemCount: 5
getItemViewType: 4

8、执行remove2(),实际调用的是notifyItemRemoved(2);，适配器执行方法如下

getItemCount: 4
getItemCount: 4
getItemViewType: 0
getItemCount: 4
getItemViewType: 1
getItemCount: 4
getItemViewType: 2
getItemCount: 4
getItemViewType: 3
getItemCount: 4
getItemCount: 4
getItemViewType: 0
getItemCount: 4
getItemViewType: 1
getItemCount: 4
getItemViewType: 2
getItemCount: 4
getItemViewType: 3

9、执行remove234(),实际调用的是notifyItemRangeRemoved(2, 3);，适配器执行方法如下

getItemCount: 2
getItemCount: 2
getItemViewType: 0
getItemCount: 2
getItemViewType: 1
getItemCount: 2
getItemCount: 2
getItemViewType: 0
getItemCount: 2
getItemViewType: 1

RecyclerView动画可以选择使用三方库

Github地址

https://github.com/wasabeef/recyclerview-animators

Android RecyclerView的notify方法和动画的刷新详解

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