安卓recyclerview的基本使用 _recyclerview

春衣少年当酒歌，起舞四顾以笑和。这篇文章主要讲述安卓recyclerview的基本使用相关的知识，希望能为你提供帮助。
1.先在布局文件中写

< android.support.v7.widget.RecyclerView android:id="@+id/my_recycler_view" android:scrollbars="vertical" android:layout_width="match_parent" android:layout_height="match_parent"/>

2.mainactivity

public class MainActivity extends AppCompatActivity { private RecyclerView mRecyclerView; private ArrayList< String> mDatas=new ArrayList< > (); private MyAdapter myAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mRecyclerView = findViewById(R.id.my_recycler_view); initDatas(); myAdapter =new MyAdapter(mDatas); mRecyclerView.setAdapter(myAdapter); mRecyclerView.setLayoutManager(new LinearLayoutManager(this)); //mRecyclerView.setLayoutManager(new GridLayoutManager(this,4)); // mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(4,StaggeredGridLayoutManager.HORIZONTAL)); //配置分割线 mRecyclerView.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL_LIST)); //事件监听myAdapter.setOnItemClickListener(new MyAdapter.OnItemClickListener() { @Override public void onClick(View v, int position, String city) { Toast.makeText(MainActivity.this,city,Toast.LENGTH_SHORT).show(); } }); int size =mDatas.size(); //添加数据到头部 myAdapter.addData(size,"adddddddddd"); //删除数据 myAdapter.removeData(0); }private static final String TAG = "MainActivity"; private void initDatas(){ mDatas.add("aa"); mDatas.add("cv"); mDatas.add("cv1"); mDatas.add("cv112"); mDatas.add("cv112"); mDatas.add("cv112"); mDatas.add("cv112"); mDatas.add("cv112"); mDatas.add("cv112"); mDatas.add("cv112"); mDatas.add("cv112"); mDatas.add("cv112"); mDatas.add("cv112"); mDatas.add("cv112"); }}

3.adpter

public class MyAdapter extends RecyclerView.Adapter< MyAdapter.ViewHolder> { private static List< String> mData; private static OnItemClickListener mListener; public void setOnItemClickListener (OnItemClickListener listener){ mListener=listener; }public MyAdapter(List< String> data) { mData = https://www.songbingjia.com/android/data; }@Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { // 实例化展示的view View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.view_rv_item, parent, false); // 实例化viewholder ViewHolder viewHolder = new ViewHolder(v); return viewHolder; }@Override public void onBindViewHolder(ViewHolder holder, int position) { // 绑定数据 holder.mTv.setText(mData.get(position)); }@Override public int getItemCount() { return mData == null ? 0 : mData.size(); }public static class ViewHolder extends RecyclerView.ViewHolder {TextView mTv; public ViewHolder(View itemView) { super(itemView); mTv = (TextView) itemView.findViewById(R.id.item_tv); itemView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if(mListener!=null){ mListener.onClick(view,getLayoutPosition(),mData.get(getLayoutPosition())); } } }); } }interface OnItemClickListener{ void onClick(View v,int position,String city); }/* *@param 添加的位置 *@param 添加的数据 * */ public void addData(int position,String city){ mData.add(position,city); notifyItemInserted(position); }public void removeData(int position){ mData.remove(position); notifyItemRemoved(position); } }

单独创建item的布局，view_rv_item.xml

< ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="45dp"> < TextView android:id="@+id/item_tv" android:gravity="center" android:layout_width="match_parent" android:layout_height="wrap_content" /> < /LinearLayout>

item的下划线，要自己写一个类，有点麻烦，直接抄了网上

public class DividerItemDecoration extends RecyclerView.ItemDecoration {private static final int[] ATTRS = new int[]{ android.R.attr.listDivider }; public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL; public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL; private Drawable mDivider; private int mOrientation; public DividerItemDecoration(Context context, int orientation) { final TypedArray a = context.obtainStyledAttributes(ATTRS); mDivider = a.getDrawable(0); a.recycle(); setOrientation(orientation); }public void setOrientation(int orientation) { if (orientation != HORIZONTAL_LIST & & orientation != VERTICAL_LIST) { throw new IllegalArgumentException("invalid orientation"); } mOrientation = orientation; }@Override public void onDraw(Canvas c, RecyclerView parent) { //Log.v("recyclerview - itemdecoration", "onDraw()"); if (mOrientation == VERTICAL_LIST) { drawVertical(c, parent); } else { drawHorizontal(c, parent); }}public void drawVertical(Canvas c, RecyclerView parent) { final int left = parent.getPaddingLeft(); final int right = parent.getWidth() - parent.getPaddingRight(); final int childCount = parent.getChildCount(); for (int i = 0; i < childCount; i++) { final View child = parent.getChildAt(i); android.support.v7.widget.RecyclerView v = new android.support.v7.widget.RecyclerView(parent.getContext()); final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child .getLayoutParams(); final int top = child.getBottom() + params.bottomMargin; final int bottom = top + mDivider.getIntrinsicHeight(); mDivider.setBounds(left, top, right, bottom); mDivider.draw(c); } }public void drawHorizontal(Canvas c, RecyclerView parent) { final int top = parent.getPaddingTop(); final int bottom = parent.getHeight() - parent.getPaddingBottom(); final int childCount = parent.getChildCount(); for (int i = 0; i < childCount; i++) { final View child = parent.getChildAt(i); final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child .getLayoutParams(); final int left = child.getRight() + params.rightMargin; final int right = left + mDivider.getIntrinsicHeight(); mDivider.setBounds(left, top, right, bottom); mDivider.draw(c); } }@Override public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) { if (mOrientation == VERTICAL_LIST) { outRect.set(0, 0, 0, mDivider.getIntrinsicHeight()); } else { outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0); } } }

对了，使用之前要配置先的