RecyclerView实现拖拽排序效果

时间：2022-06-01 22:14:44

效果就是这样，RecyclerView列表可拖拽排序，可删除，可添加；

RecyclerView实现拖拽排序效果

RecyclerView给我们提供了一个手势器：

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ItemTouchHelper helper = new ItemTouchHelper(new ItemTouchHelper.Callback() {
  @Override
  public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
   int dragFrlg = 0;
   if (recyclerView.getLayoutManager() instanceof GridLayoutManager){
    dragFrlg = ItemTouchHelper.UP|ItemTouchHelper.DOWN|ItemTouchHelper.LEFT|ItemTouchHelper.RIGHT;
   }else if(recyclerView.getLayoutManager() instanceof LinearLayoutManager){
    dragFrlg = ItemTouchHelper.UP|ItemTouchHelper.DOWN;
   }
   return makeMovementFlags(dragFrlg,0);
  }
 
  @Override
  public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
   //滑动事件 下面注释的代码，滑动后数据和条目错乱，被舍弃
//   Collections.swap(datas,viewHolder.getAdapterPosition(),target.getAdapterPosition());
//   ap.notifyItemMoved(viewHolder.getAdapterPosition(),target.getAdapterPosition());
 
   //得到当拖拽的viewHolder的Position
   int fromPosition = viewHolder.getAdapterPosition();
   //拿到当前拖拽到的item的viewHolder
   int toPosition = target.getAdapterPosition();
   if (fromPosition < toPosition) {
    for (int i = fromPosition; i < toPosition; i++) {
     Collections.swap(datas, i, i + 1);
    }
   } else {
    for (int i = fromPosition; i > toPosition; i--) {
     Collections.swap(datas, i, i - 1);
    }
   }
   ap.notifyItemMoved(fromPosition, toPosition);
   return true;
  }
 
  @Override
  public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
    //侧滑删除可以使用；
  }
 
  @Override
  public boolean isLongPressDragEnabled() {
   return true;
  }
  /**
   * 长按选中Item的时候开始调用
   * 长按高亮
   * @param viewHolder
   * @param actionState
   */
  @Override
  public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
   if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) {
    viewHolder.itemView.setBackgroundColor(Color.RED);
    //获取系统震动服务//震动70毫秒
    Vibrator vib = (Vibrator) getSystemService(Service.VIBRATOR_SERVICE);
    vib.vibrate(70);
   }
   super.onSelectedChanged(viewHolder, actionState);
  }
 
  /**
   * 手指松开的时候还原高亮
   * @param recyclerView
   * @param viewHolder
   */
  @Override
  public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
   super.clearView(recyclerView, viewHolder);
   viewHolder.itemView.setBackgroundColor(0);
   ap.notifyDataSetChanged(); //完成拖动后刷新适配器，这样拖动后删除就不会错乱
  }
 });

设置给RecyclerView即可：

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helper.attachToRecyclerView(rv);

下面是完整的代码和Xml布局文件：

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public class MainActivity extends AppCompatActivity implements View.OnClickListener {
 private final String TAG = this.getClass().getSimpleName();
 private List<String> d = Arrays.asList(
   "A","B","C","D","E","F","G"
   ,"H","I","J","K","L","M","N"
   ,"O","P","Q","R","S","T"
   ,"U","V","W","X","Y","Z");
 private RecyclerView rv ;
 private Ap<String> ap;
 private List<String> datas;
 private EditText edAdd;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  initData();
  rv = findViewById(R.id.rv);
  edAdd =findViewById(R.id.et_add);
  rv.setLayoutManager(new GridLayoutManager(this,3));
//  rv.setLayoutManager(new LinearLayoutManager(this));
  ap = new Ap(this, datas);
  rv.setAdapter(ap);
  helper.attachToRecyclerView(rv);
  findViewById(R.id.tv).setOnClickListener(this);
  findViewById(R.id.tv_add).setOnClickListener(this);
 }
 
 private void initData() {
  datas = new ArrayList<>();
//  直接用d操作集合会崩溃，Arrays.asList集合不可增删改；详细可以看我的博客
  for (int i = 0; i < d.size(); i++) {
   datas.add(d.get(i));
  }
 }
 
 @Override
 public void onClick(View view) {
  switch (view.getId()){
   case R.id.tv:
    for (int i = 0; i < datas.size(); i++) {
     Log.i(TAG, "onClick: ____"+datas.get(i));
    }
    break;
   case R.id.tv_add:
    ap.add(edAdd.getText().toString().trim());
    edAdd.setText(null);
    break;
  }
 }
 
 
 class Ap<T> extends RecyclerView.Adapter<Ap.Vh>{
  private Context context;
  public List<T> stringList;
  public Ap(Context context, List<T> stringList) {
   this.context = context;
   this.stringList = stringList;
  }
 
  @Override
  public Ap.Vh onCreateViewHolder(ViewGroup parent, int viewType) {
   return new Vh(LayoutInflater.from(context).inflate(R.layout.item_rv,null));
  }
 
  @Override
  public void onBindViewHolder(Ap.Vh holder, final int position) {
   holder.tv.setText(stringList.get(position).toString());
   holder.iv.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
     remove(position);
    }
   });
  }
 
  @Override
  public int getItemCount() {
   return stringList.size();
  }
 
  public void add(T item){
   int position = stringList.size();
   stringList.add(item);
   notifyItemInserted(position);
  }
 
  public void add(int position,T item){
   stringList.add(position,item);
   notifyItemInserted(position);
  }
//  public void remove(T item) {
//   final int position = stringList.indexOf(item);
//   if (-1 == position)
//    return;
//   stringList.remove(item);
//   notifyItemRemoved(position);
//  }
 
  public void remove(int position) {
   stringList.remove(position);
   notifyItemRemoved(position);
   notifyItemRangeChanged(position,stringList.size());
  }
 
  class Vh extends RecyclerView.ViewHolder {
 
   public Vh(View itemView) {
    super(itemView);
    tv = itemView.findViewById(R.id.tv);
    iv = itemView.findViewById(R.id.iv_delete);
   }
   public TextView tv;
   public ImageView iv;
  }
 }
 
 ItemTouchHelper helper = new ItemTouchHelper(new ItemTouchHelper.Callback() {
  @Override
  public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
   int dragFrlg = 0;
   if (recyclerView.getLayoutManager() instanceof GridLayoutManager){
    dragFrlg = ItemTouchHelper.UP|ItemTouchHelper.DOWN|ItemTouchHelper.LEFT|ItemTouchHelper.RIGHT;
   }else if(recyclerView.getLayoutManager() instanceof LinearLayoutManager){
    dragFrlg = ItemTouchHelper.UP|ItemTouchHelper.DOWN;
   }
   return makeMovementFlags(dragFrlg,0);
  }
 
  @Override
  public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
   //滑动事件 下面注释的代码，滑动后数据和条目错乱，被舍弃
//   Collections.swap(datas,viewHolder.getAdapterPosition(),target.getAdapterPosition());
//   ap.notifyItemMoved(viewHolder.getAdapterPosition(),target.getAdapterPosition());
 
   //得到当拖拽的viewHolder的Position
   int fromPosition = viewHolder.getAdapterPosition();
   //拿到当前拖拽到的item的viewHolder
   int toPosition = target.getAdapterPosition();
   if (fromPosition < toPosition) {
    for (int i = fromPosition; i < toPosition; i++) {
     Collections.swap(datas, i, i + 1);
    }
   } else {
    for (int i = fromPosition; i > toPosition; i--) {
     Collections.swap(datas, i, i - 1);
    }
   }
   ap.notifyItemMoved(fromPosition, toPosition);
   return true;
  }
 
  @Override
  public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
    //侧滑删除可以使用；
  }
 
  @Override
  public boolean isLongPressDragEnabled() {
   return true;
  }
  /**
   * 长按选中Item的时候开始调用
   * 长按高亮
   * @param viewHolder
   * @param actionState
   */
  @Override
  public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
   if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) {
    viewHolder.itemView.setBackgroundColor(Color.RED);
    //获取系统震动服务//震动70毫秒
    Vibrator vib = (Vibrator) getSystemService(Service.VIBRATOR_SERVICE);
    vib.vibrate(70);
   }
   super.onSelectedChanged(viewHolder, actionState);
  }
 
  /**
   * 手指松开的时候还原高亮
   * @param recyclerView
   * @param viewHolder
   */
  @Override
  public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
   super.clearView(recyclerView, viewHolder);
   viewHolder.itemView.setBackgroundColor(0);
   ap.notifyDataSetChanged(); //完成拖动后刷新适配器，这样拖动后删除就不会错乱
  }
 });
}

Xml布局文件：

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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context="com.ccb.pactera.dragrecyclerviewdemo.MainActivity">
 
 <LinearLayout
  android:id="@+id/ll"
  android:background="#eeeeee"
  android:orientation="horizontal"
  android:layout_width="match_parent"
  android:layout_height="48dp">
  <TextView
   android:layout_width="0dp"
   android:layout_weight="1"
   android:layout_height="48dp"
   android:id="@+id/tv"
   android:text="查看数据"
   android:textColor="#fff"
   android:textSize="16dp"
   android:gravity="center"
   android:background="@color/colorAccent"
   />
  <EditText
   android:id="@+id/et_add"
   android:layout_width="0dp"
   android:layout_height="match_parent"
   android:layout_weight="1"/>
  <TextView
   android:layout_width="0dp"
   android:layout_weight="1"
   android:layout_height="48dp"
   android:id="@+id/tv_add"
   android:text="添加数据"
   android:textColor="#fff"
   android:textSize="16dp"
   android:gravity="center"
   android:background="#fc1"
   />
 </LinearLayout>
 <android.support.v7.widget.RecyclerView
  android:id="@+id/rv"
  android:layout_below="@id/ll"
  android:layout_width="match_parent"
  android:layout_height="match_parent" />
 
</RelativeLayout>

RecyclerView的Item：

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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:background="#f1f1f1"
 android:layout_height="match_parent">
 <RelativeLayout
  android:layout_width="match_parent"
  android:background="#fff"
  android:layout_margin="0.5dp"
  android:layout_height="match_parent">
 <ImageView
  android:layout_width="match_parent"
  android:layout_height="50dp"
  android:src="@mipmap/icon"
  android:id="@+id/iv"
  android:layout_marginTop="10dp"
  />
<TextView
 android:id="@+id/tv"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:textSize="16dp"
 android:layout_below="@id/iv"
 android:gravity="center_horizontal"
 android:layout_marginBottom="10dp"
 />
 <ImageView
  android:layout_width="25dp"
  android:layout_height="25dp"
  android:layout_alignParentRight="true"
  android:src="@mipmap/detele"
  android:id="@+id/iv_delete"
  />
 </RelativeLayout>
</RelativeLayout>

资源链接Github

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。

原文链接：https://blog.csdn.net/qq_35605213/article/details/80541461

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