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This article will explain in detail how to use RecycleView for you. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

The design pattern of RecycleView is the observer pattern, which will be explored later.

Recycleview has three layouts: (1) waterfall flow StaggeredGridLayoutManager (2) GridLayoutManager (3) Layoutmanager. They all have the function of horizontal and vertical sliding.

Specific implementation:

@ Overrideprotected void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState); setContentView (R.layout.activity_main); initData (); mRecyclerView = (RecyclerView) findViewById (R.id.id_recyclerview); LinearLayoutManager linearLayoutManager = new LinearLayoutManager (this); linearLayoutManager.setOrientation (LinearLayout.VERTICAL); / / set the horizontal and vertical display mRecyclerView.setLayoutManager (linearLayoutManager); mRecyclerView.setAdapter (mAdapter = new HomeAdapter ()); mRecyclerView.addItemDecoration (new MyDecorlation (MainActivity.this, MyDecorlation.VERTICAL_LIST)) MRecyclerView.setItemAnimator (new DefaultItemAnimator ());}

HomeAdapter inherits RecycleView.Adapter and overrides oncreatViewHold (). This method is used to get the layout and set it to Viewhold. OnBindViewHold () is bound to viewhold and gets the controls in the oncreatViewHold () layout through the holder object. The ViewHold class needs to inherit RecycleView.ViewHold, which is used to get the control.

HomeAdapter RecyclerView.Adapter {ViewHold (ViewGroup parentviewType) {View inflate = LayoutInflater. (MainActivity.) .propagate (R.layout.parent) ViewHold viewHold = ViewHold (inflate) viewHold} (ViewHold holderposition) {String data = .get (position) holder..setText (data) holder..setOnClickListener (View.OnClickListener () {(View view) {Log. (+). Remove () notifyItemRemoved () notifyDataSetChanged ()} })} () {.size ()} ViewHold RecyclerView.ViewHolder {TextView (View itemView) {(itemView) = (TextView) itemView.findViewById (R.id.)}

There is only one textview in the layout.

The animation effect uses its default effect, the split line needs to inherit RecycleView.ItemDecoration, and the onDraw () and getitemoffset () methods are overridden. Setting the split line is different when sliding horizontally and longitudinally. The former uses the drawable.draw () method to set the specific size and position of the picture display drawable.setBonds (); the latter method is to set the display position and height of the split line relative to the item.

MyDecorlation RecyclerView.ItemDecoration {= LinearLayoutManager.= LinearLayoutManager. [] = {android.R.attr.} Drawable (Context contextorientation) {TypedArray a = context.obtainStyledAttributes () = a.getDrawable () a.recycle () setItemdecor (orientation)} (orientation) {(orientation! = & & orientation! =) {IllegalArgumentException ()} = orientation} (Canvas cRecyclerView parentRecyclerView.State state) { .onDraw (cparentstate) (= = LinearLayoutManager.) {setHorizontal (cparent)} {setVertical (cparent)}} (Canvas cRecyclerView parent) {left = parent.getPaddingLeft () right = parent.getWidth ()-parent.getPaddingRight () childCount = parent.getChildCount () (I = I < childCounti++) {View child = parent.getChildAt (I) android.support.v7.widget.RecyclerView v = android.support.v7 .widget.RecyclerView (parent.getContext ()) RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child .getLayoutParams () top = child.getBottom () + params.bottom = top + .getIntrinsicHeight (). SetBounds (lefttoprightbottom) .draw (c)} (Canvas cRecyclerView parent) {top = parent.getPaddingTop () bottom = parent.getHeight ()-parent.getPaddingBottom () childCount = parent.getChildCount () (I = I < childCounti++) { View child = parent.getChildAt (I) RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child .getLayoutParams () left = child.getRight () + params.right = left + .getIntrinsicHeight (). SetBounds (lefttoprightbottom) .draw (c)} (Rect outRectView viewRecyclerView parentRecyclerView.State state) {.getItemOffsets (outRectviewparentstate) (= = LinearLayoutManager.) {outRect.set (.getIntriche ight ())} { OutRect.set (.getIntrinsicHeight ())}

When using RecycleView to delete and add item, use notifyItemInserted (position); and notifyItemRemoved (position). But when I use it, the array is out of bounds. The reason is that adapter is not really refreshed. For example, when I click to delete the second item, that is, position is 1, and then click the second item, I will see that I have jumped to the next item. In fact, position is 2 at this time. So the solution is to call notifidatasetchange () again after calling notifyItemInserted or notifyItemRemoved.

This is the end of the article on "how to use RecycleView". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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