Android 拖放RecyclerView-将触摸限制到特定的viewholder
我正在尝试在recyclerview中实现拖放。我成功地实现了它。但是我有一个小问题。只有当我拖动特定的viewHolder(ImageView)时,才能进行拖放操作。但在我的recyclerview中,当我触摸行的任何部分并拖动时,项目开始拖动。我只希望在触摸ImageView并拖动时拖动行或项目 我遵循了本教程: 代码:Android 拖放RecyclerView-将触摸限制到特定的viewholder,android,android-recyclerview,drag-and-drop,Android,Android Recyclerview,Drag And Drop,我正在尝试在recyclerview中实现拖放。我成功地实现了它。但是我有一个小问题。只有当我拖动特定的viewHolder(ImageView)时,才能进行拖放操作。但在我的recyclerview中,当我触摸行的任何部分并拖动时,项目开始拖动。我只希望在触摸ImageView并拖动时拖动行或项目 我遵循了本教程: 代码: public class EditItemTouchHelperCallback extends ItemTouchHelper.Callback { private f
public class EditItemTouchHelperCallback extends ItemTouchHelper.Callback {
private final PlaylistUserAdapter mAdapter;
public EditItemTouchHelperCallback(PlaylistUserAdapter adapter) {
mAdapter = adapter;
}
@Override
public boolean isLongPressDragEnabled() {
return true;
}
@Override
public boolean isItemViewSwipeEnabled() {
return true;
}
@Override
public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
int swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END;
return makeMovementFlags(dragFlags, swipeFlags);
}
@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder,
RecyclerView.ViewHolder target) {
mAdapter.onItemMove(viewHolder.getAdapterPosition(), target.getAdapterPosition());
return true;
}
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
mAdapter.onItemDismiss(viewHolder.getAdapterPosition());
}
适配器:
public class PlaylistUserAdapter extends RecyclerView.Adapter<PlaylistUserAdapter.ViewHolder> implements ItemTouchHelperAdapter{
private Context context;
private ArrayList<SongInfoModel> SongList = new ArrayList<>();
private RecyclerItemClickListener listener;
private final OnStartDragListener mDragStartListener;
private SparseBooleanArray expandState = new SparseBooleanArray();
public PlaylistUserAdapter(Context context, ArrayList<SongInfoModel> songList,OnStartDragListener dragListner,RecyclerItemClickListener listener) {
this.context = context;
SongList = songList;
this.listener = listener;
mDragStartListener = dragListner;
}
@Override
public PlaylistUserAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.row_song, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(final PlaylistUserAdapter.ViewHolder holder, int position) {
final SongInfoModel songInfoModel = SongList.get(position);
final boolean isExpanded = expandState.get(position);
holder.expandableLayout.setVisibility(isExpanded?View.VISIBLE:View.GONE);
holder.songName.setText(songInfoModel.SongName);
holder.artistName.setText(songInfoModel.ArtistName);
holder.duration.setText(String.valueOf(songInfoModel.duration));
String duration = Utility.convertDuration(songInfoModel.getDuration());
holder.duration.setText(duration);
Picasso.with(context).load(songInfoModel.getAlbumIDArtwork()).placeholder(R.drawable.ic_launcher).into(holder.iv_artwork);
Picasso.with(context).load(R.mipmap.drag).into(holder.expandArrow);
holder.bind(songInfoModel, listener);
holder.expandArrow.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
if (MotionEventCompat.getActionMasked(motionEvent) == MotionEvent.ACTION_DOWN) {
mDragStartListener.onStartDrag(holder,songInfoModel);}
return false;
}
});
}
@Override
public int getItemCount() {
return SongList.size();
}
@Override
public boolean onItemMove(int fromPosition, int toPosition) {
ContentResolver cr = context.getContentResolver();
if (fromPosition < SongList.size() && toPosition < SongList.size()) {
if (fromPosition < toPosition) {
for (int i = fromPosition; i < toPosition; i++) {
Collections.swap(SongList, i, i + 1);
}
} else {
for (int i = fromPosition; i > toPosition; i--) {
Collections.swap(SongList, i, i - 1);
}
}
notifyItemMoved(fromPosition, toPosition);
}
PlayListUser.trackMoved(fromPosition,toPosition, cr, SongList);
return true;
}
@Override
public void onItemDismiss(int position) {
SongList.remove(position);
notifyItemRemoved(position);
}
public class ViewHolder extends RecyclerView.ViewHolder implements ItemTouchHelperViewHolder {
private TextView songName;
private TextView artistName;
private TextView duration;
private ImageView iv_artwork;
private ImageView expandArrow;
private RelativeLayout expandableLayout;
private CardView card_view;
private LinearLayout PlaySongLayout;
private LinearLayout AddPlayListLayout;
private LinearLayout EditTag;
private LinearLayout RingtoneLayout;
private LinearLayout ShareLayout;
private LinearLayout DeleteLayout;
public ViewHolder(View itemView) {
super(itemView);
songName = (TextView)itemView.findViewById(R.id.SongName);
artistName= (TextView)itemView.findViewById(R.id.ArtistName);
duration = (TextView) itemView.findViewById(R.id.duration);
iv_artwork = (ImageView) itemView.findViewById(R.id.iv_artwork);
expandableLayout = itemView.findViewById(R.id.expandableLayout);
card_view = itemView.findViewById(R.id.card_view);
expandArrow=itemView.findViewById(R.id.expandArrow);
PlaySongLayout = itemView.findViewById(R.id.PlaySongLayout);
AddPlayListLayout = itemView.findViewById(R.id.AddPlayListLayout);
EditTag = itemView.findViewById(R.id.EditTag);
RingtoneLayout = itemView.findViewById(R.id.RingtoneLayout);
ShareLayout = itemView.findViewById(R.id.ShareLayout);
DeleteLayout = itemView.findViewById(R.id.DeleteLayout);
}
public void bind(final SongInfoModel songInfoModel, final RecyclerItemClickListener listener) {
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
listener.onClickListener(songInfoModel, getLayoutPosition());
}
});
itemView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View view) {
listener.onLongClickListener(songInfoModel, getLayoutPosition(),view);
onClickButton(expandableLayout,getLayoutPosition(),card_view);
return true;
}
});
}
@Override
public void onItemSelected() {
itemView.setBackgroundColor(Color.LTGRAY);
}
@Override
public void onItemClear() {
itemView.setBackgroundColor(0);
}
公共类PlayUserAdapter扩展了RecyclerView。适配器实现ItemTouchHelperAdapter{
私人语境;
private ArrayList SongList=new ArrayList();
私有RecyclerItemClickListener侦听器;
私人决赛开始时,主持人;
私有SparseBooleanArray expandState=新SparseBooleanArray();
公共播放用户适配器(上下文上下文、ArrayList歌曲列表、OnStartDragListener dragListner、RecyclerItemClickListener侦听器){
this.context=上下文;
歌曲列表=歌曲列表;
this.listener=listener;
MdragListener=dragListner;
}
@凌驾
公共播放列表UserAdapter.ViewHolder onCreateViewHolder(视图组父级,int-viewType){
视图=LayoutFlater.from(上下文)。充气(R.layout.row_song,父项,false);
返回新的ViewHolder(视图);
}
@凌驾
public void onBindViewHolder(最终播放列表UserAdapter.ViewHolder,int位置){
final SongInfoModel SongInfoModel=SongList.get(位置);
最终布尔值isExpanded=expandState.get(位置);
holder.expandableLayout.setVisibility(isExpanded?View.VISIBLE:View.GONE);
holder.songName.setText(songInfoModel.songName);
holder.artistName.setText(songInfoModel.artistName);
holder.duration.setText(String.valueOf(songInfoModel.duration));
字符串duration=Utility.convertDuration(songInfoModel.getDuration());
holder.duration.setText(持续时间);
毕加索.with(context).load(songInfoModel.getAlbumIDArtwork()).placeholder(R.drawable.ic_launcher).into(holder.iv_artwork);
毕加索.with(context).load(R.mipmap.drag).into(holder.expandArrow);
holder.bind(songInfoModel、listener);
holder.expandArrow.setOnTouchListener(新视图.OnTouchListener(){
@凌驾
公共布尔onTouch(视图、运动事件、运动事件){
if(MotionEventCompat.getActionMasked(motionEvent)==motionEvent.ACTION\u DOWN){
mDragStartListener.onStartDrag(holder,songInfoModel);}
返回false;
}
});
}
@凌驾
public int getItemCount(){
返回SongList.size();
}
@凌驾
公共布尔onItemMove(int-fromPosition,int-toPosition){
ContentResolver cr=context.getContentResolver();
if(fromPositiontoPosition;i--){
收藏。交换(歌曲列表,i,i-1);
}
}
已移动的项目(从位置、位置);
}
playliuser.trackMoved(fromPosition、toPosition、cr、SongList);
返回true;
}
@凌驾
公共空间和公共空间(内部位置){
歌曲列表。删除(位置);
已移除(位置)的项目;
}
公共类ViewHolder扩展了RecyclerView.ViewHolder实现了ItemTouchHelperViewer{
私有文本视图songName;
私有文本视图艺术家名称;
私有文本视图持续时间;
私人ImageView iv_艺术品;
私有图像视图扩展箭头;
私密的可扩展布局;
私人卡视图卡视图;
私人线路布局播放歌曲布局;
专用线路布局;
私人线路布局编辑标签;
私人线路布局铃声;
私人线路布局股份布局;
私人线路布局图;
公共视图持有者(视图项视图){
超级(项目视图);
songName=(TextView)itemView.findViewById(R.id.songName);
artistName=(TextView)itemView.findViewById(R.id.artistName);
duration=(TextView)itemView.findViewById(R.id.duration);
iv_artwork=(ImageView)itemView.findViewById(R.id.iv_artwork);
expandableLayout=itemView.findviewbyd(R.id.expandableLayout);
card\u view=itemView.findviewbyd(R.id.card\u view);
expandArrow=itemView.findviewbyd(R.id.expandArrow);
PlaySongLayout=itemView.findViewById(R.id.PlaySongLayout);
AddPlaylayLayout=itemView.findViewById(R.id.AddPlaylayLayout);
EditTag=itemView.findViewById(R.id.EditTag);
RingtoneLayout=itemView.findviewbyd(R.id.RingtoneLayout);
ShareLayout=itemView.findViewById(R.id.ShareLayout);
DeleteLayout=itemView.findViewById(R.id.DeleteLayout);
}
公共void绑定(最终SongInfoModel SongInfoModel、最终RecyclerItemClickListener侦听器){
itemView.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
onClickListener(songInfoModel,getLayoutPosition());
}
});
itemView.setOnLongClickListener(新视图.OnLongClickListener(){
@凌驾
仅长按公共布尔值(视图){
onLongClickListener(songInfoModel,getLayoutPosition(),view);
onClick按钮(expandableLayout,getLayoutPosition(),卡片视图);
返回true;
}
});
}
@凌驾
已选定的公共文件(){
itemView.setBackgroundColor(Color.LTGRAY);
}
@凌驾
公共许可证{
itemView.setBackgroundColor(0);
}
如教程所述
创建OnStartDragListener接口
import android.support.v7.widget.RecyclerView;
public interface OnStartDragListener {
void onStartDrag(RecyclerView.ViewHolder viewHolder);
}
并在从片段/活动创建适配器时将其传递给适配器
myAdapteradapter = new myAdapteradapter (new OnStartDragListener() {
@Override
public void onStartDrag(RecyclerView.ViewHolder viewHolder) {
mItemTouchHelper.startDrag(viewHolder);
}
});
在安宾维
holder.imageReorder.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getActionMasked() == MotionEvent.ACTION_DOWN) {
mDragStartListener.onStartDrag(holder);
return true;
}
return false;
}
});