android - RecyclerView长按拖动以重新排列摆动效果

如何在gridlayoutmanager的recyclerview中长时间点击某个项目并拖动以重新排序时实现类似this的抖动效果，这很好。当物品掉落时，效果应该停止。
这是我的适配器类

public class ClassGridAdapter extends RecyclerView.Adapter<ClusterGridAdapter.ViewHolder> implements ItemTouchHelperCluster {
private ArrayList<Class> mClassList = new ArrayList<>();
private Context mContext;

public ClassGridAdapter(Context context, ArrayList<Class> mClusters) {
    this.mClassList = mClusters;
    this.mContext = context;
}

@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    LayoutInflater inflater = LayoutInflater.from(mContext);
    View view = inflater.inflate(R.layout.grid_item, parent, false);
    return new ViewHolder(view);
}

@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
    holder.mClusterName.setText(mClassList.get(position).getName());
    holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View view) {
            mDragStartListener.onStartDrag(holder);
            return true;
        }
    });
}

@Override
public int getItemCount() {
    return mClusters.size();
}

@Override
public boolean onItemMove(int fromPosition, int toPosition) {
    Collections.swap(mClassList, fromPosition, toPosition);
    notifyItemMoved(fromPosition, toPosition);
    return true;
}

class ViewHolder extends RecyclerView.ViewHolder {
    TextView mClusterName;
    public ViewHolder(View itemView) {
        super(itemView);
        mClusterName = (TextView) itemView.findViewById(R.id.tv_cluster);
    }
}

}

最佳答案

在@cheticamp的帮助下，通过以下代码修复了它。
类GridAdapter.java

public class ClassGridAdapter extends RecyclerView.Adapter<ClusterGridAdapter.ViewHolder> implements ItemTouchHelperCluster {
private ArrayList<Class> mClassList = new ArrayList<>();
private Context mContext;
boolean isAnimate = false;
Animation animation;

public ClassGridAdapter(Context context, ArrayList<Class> mClusters) {
    this.mClassList = mClusters;
    this.mContext = context;
    animation = AnimationUtils.loadAnimation(mContext, R.anim.wobble);
    setHasStableIds(true);
}

@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    LayoutInflater inflater = LayoutInflater.from(mContext);
    View view = inflater.inflate(R.layout.grid_item, parent, false);
    return new ViewHolder(view);
}

@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
    holder.mClusterName.setText(mClassList.get(position).getName());
    if (isAnimate)
        holder.itemView.startAnimation(animation);
    else
        holder.itemView.clearAnimation();
    holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View view) {
            mDragStartListener.onStartDrag(holder);
            isAnimate = true;
            notifyDataSetChanged();
            return true;
        }
    });
}

@Override
public int getItemCount() {
    return mClusters.size();
}

@Override
public boolean onItemMove(int fromPosition, int toPosition) {
    Collections.swap(mClassList, fromPosition, toPosition);
    notifyItemMoved(fromPosition, toPosition);
    return true;
}

@Override
public void onItemRelease() {
    isAnimate = false;
    notifyDataSetChanged();
}

class ViewHolder extends RecyclerView.ViewHolder {
    TextView mClusterName;
    public ViewHolder(View itemView) {
        super(itemView);
        mClusterName = (TextView) itemView.findViewById(R.id.tv_cluster);
    }
}

}
摇摆.xml

<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="100"
android:fromDegrees="-5"
android:pivotX="50%"
android:pivotY="50%"
android:repeatCount="infinite"
android:repeatMode="reverse"
android:toDegrees="5" />

simpleTimeTouchhelperCallback.java

public class SimpleItemTouchHelperCallback extends ItemTouchHelper.Callback {

public static final float ALPHA_FULL = 1.0f;

private final ItemTouchHelperCluster mAdapter;

public SimpleItemTouchHelperCallback(ItemTouchHelperCluster adapter) {
    mAdapter = adapter;
}

@Override
public boolean isLongPressDragEnabled() {
    return false;
}

@Override
public boolean isItemViewSwipeEnabled() {
    return false;
}

@Override
public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
    // Set movement flags based on the layout manager
    if (recyclerView.getLayoutManager() instanceof GridLayoutManager) {
        final int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;
        final int swipeFlags = 0;
        return makeMovementFlags(dragFlags, swipeFlags);
    } else {
        final int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
        final int swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END;
        return makeMovementFlags(dragFlags, swipeFlags);
    }
}

@Override
public boolean onMove(RecyclerView recyclerView,
 RecyclerView.ViewHolder source, RecyclerView.ViewHolder target) {
    System.out.println("SimpleItemTouchHelperCallback.onMove");
    if (source.getItemViewType() != target.getItemViewType()) {
        return false;
    }

    // Notify the adapter of the move
    mAdapter.onItemMove(source.getAdapterPosition(),
target.getAdapterPosition());
    return true;
}

@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int i) {
    System.out.println("SimpleItemTouchHelperCallback.onSwiped");
    // Notify the adapter of the dismissal
    //        mAdapter.onItemDismiss(viewHolder.getAdapterPosition());
}

@Override
public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
    if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
        // Fade out the view as it is swiped out of the parent's bounds
        final float alpha = ALPHA_FULL - Math.abs(dX) / (float) v .
 iewHolder.itemView.getWidth();
        viewHolder.itemView.setAlpha(alpha);
        viewHolder.itemView.setTranslationX(dX);
    } else {
        super.onChildDraw(c, recyclerView, viewHolder, dX, dY,
 actionState, isCurrentlyActive);
    }
}

@Override
public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int
actionState) {
    // We only want the active item to change
    if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) {
        if (viewHolder instanceof ItemTouchHelperViewHolder) {
            // Let the view holder know that this item is being moved
 or dragged
            ItemTouchHelperViewHolder itemViewHolder =
 (ItemTouchHelperViewHolder) viewHolder;
            itemViewHolder.onItemSelected();
        }
    }

    super.onSelectedChanged(viewHolder, actionState);
}

@Override
public void clearView(RecyclerView recyclerView,
RecyclerView.ViewHolder viewHolder) {
    super.clearView(recyclerView, viewHolder);
    System.out.println("SimpleItemTouchHelperCallback.clearView");
    viewHolder.itemView.setAlpha(ALPHA_FULL);
    mAdapter.onItemRelease();
    if (viewHolder instanceof ItemTouchHelperViewHolder) {
        // Tell the view holder it's time to restore the idle state
        ItemTouchHelperViewHolder itemViewHolder = (ItemTouchHelperViewHolder) viewHolder;
        itemViewHolder.onItemClear();
    }
}
}

关于android - RecyclerView长按拖动以重新排列摆动效果，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/48790655/