Android使用ItemTouchHelper实现侧滑删除和拖拽
本文实例为大家分享了如何使用ItemTouchHelper实现侧滑删除和拖拽的具体代码，供大家参考，具体内容如下
1.定义一个简单bean类:
publicclassImgText{
publicintresId;
publicStringdes;
}
2.实现一个RecyclerView.Adapter
publicclassSwipeRecyclerAdapterextendsRecyclerView.Adapter{ privateList mList; publicSwipeRecyclerAdapter(List list){ mList=list; } @Override publicMyHolderonCreateViewHolder(ViewGroupparent,intviewType){ Viewview=LayoutInflater.from(parent.getContext()).inflate(R.layout.item_swipe_recycler,parent,false); returnnewMyHolder(view); } @Override publicvoidonBindViewHolder(MyHolderholder,intposition){ ImgTextimgText=mList.get(position); holder.img.setImageResource(imgText.resId); holder.des.setText(imgText.des); } @Override publicintgetItemCount(){ returnmList.size(); } publicclassMyHolderextendsRecyclerView.ViewHolder{ privateImageViewimg; privateTextViewdes; publicMyHolder(ViewitemView){ super(itemView); img=(ImageView)itemView.findViewById(R.id.img); des=(TextView)itemView.findViewById(R.id.text); } } }
3.绘制分割线:
publicclassDividerItemDecorationextendsRecyclerView.ItemDecoration{
privatestaticfinalint[]ATTRS=newint[]{android.R.attr.listDivider};
publicstaticfinalintHORIZONTAL_LIST=LinearLayoutManager.HORIZONTAL;
publicstaticfinalintVERTICAL_LIST=LinearLayoutManager.VERTICAL;
privateDrawablemDivider;
privateintmOrientation;
publicDividerItemDecoration(Contextcontext,intorientation){
finalTypedArraya=context.obtainStyledAttributes(ATTRS);
mDivider=a.getDrawable(0);
a.recycle();
setOrientation(orientation);
}
publicvoidsetOrientation(intorientation){
if(orientation!=HORIZONTAL_LIST&&orientation!=VERTICAL_LIST){
thrownewIllegalArgumentException("invalidorientation");
}
mOrientation=orientation;
}
@Override
publicvoidonDraw(Canvasc,RecyclerViewparent){
if(mOrientation==VERTICAL_LIST){
drawVertical(c,parent);
}else{
drawHorizontal(c,parent);
}
}
publicvoiddrawVertical(Canvasc,RecyclerViewparent){
finalintleft=parent.getPaddingLeft();
finalintright=parent.getWidth()-parent.getPaddingRight();
finalintchildCount=parent.getChildCount();
for(inti=0;i
4.实现ItemTouchHelper.Callback接口:
publicclassSwipeCallbackextendsItemTouchHelper.Callback{
privateRecyclerView.AdaptermAdapter;
privateListmList;
publicSwipeCallback(RecyclerView.Adapteradapter,Listlist){
mAdapter=adapter;
mList=list;
}
@Override
publicbooleanisLongPressDragEnabled(){
returntrue;
}
@Override
publicbooleanisItemViewSwipeEnabled(){
returntrue;
}
@Override
publicintgetMovementFlags(RecyclerViewrecyclerView,RecyclerView.ViewHolderviewHolder){
intdragFlag=ItemTouchHelper.UP|ItemTouchHelper.DOWN;
intswipeFlags=ItemTouchHelper.END|ItemTouchHelper.START;
returnmakeMovementFlags(dragFlag,swipeFlags);
}
//用于移动item的位置
@Override
publicbooleanonMove(RecyclerViewrecyclerView,RecyclerView.ViewHolderviewHolder,RecyclerView.ViewHoldertarget){
Collections.swap(mList,viewHolder.getAdapterPosition(),target.getAdapterPosition());
mAdapter.notifyItemMoved(viewHolder.getAdapterPosition(),target.getAdapterPosition());
returntrue;
}
//一般用于滑动删除
@Override
publicvoidonSwiped(RecyclerView.ViewHolderviewHolder,intdirection){
mList.remove(viewHolder.getAdapterPosition());
mAdapter.notifyItemRemoved(viewHolder.getAdapterPosition());
}
}
5.编写侧滑删除和拖拽Activity
publicclassSwipeRecyclerViewActivityextendsAppCompatActivity{
privateRecyclerViewmRecyclerView;
privateListmList;
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_swipe_recycler);
mRecyclerView=(RecyclerView)findViewById(R.id.recycler);
mList=newArrayList<>();
for(inti=0;i<20;i++){
ImgTextit=newImgText();
it.resId=R.mipmap.ic_launcher;
it.des=i+"侧滑删除文字";
mList.add(it);
}
finalSwipeRecyclerAdapteradapter=newSwipeRecyclerAdapter(mList);
RecyclerView.LayoutManagermanager=newLinearLayoutManager(this,LinearLayoutManager.VERTICAL,false);
mRecyclerView.setLayoutManager(manager);
mRecyclerView.setItemAnimator(newDefaultItemAnimator());
mRecyclerView.addItemDecoration(newDividerItemDecoration(this,DividerItemDecoration.VERTICAL_LIST));
mRecyclerView.setAdapter(adapter);
ItemTouchHelperswipeItemHelper=newItemTouchHelper(newSwipeCallback<>(adapter,mList));
swipeItemHelper.attachToRecyclerView(mRecyclerView);
}
}
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毛票票。
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