RecyclerView 刷新+加载

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    <?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context="mvpframework.bwie.com.a1509arvdemo.MainActivity"><android.support.v4.widget.SwipeRefreshLayout    android:id="@+id/srl"    android:layout_width="match_parent"    android:layout_height="match_parent">    <android.support.v7.widget.RecyclerView        android:id="@+id/rv"        android:layout_width="match_parent"        android:layout_height="match_parent" /></android.support.v4.widget.SwipeRefreshLayout></LinearLayout>

item布局

    <?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/ll"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"><TextView    android:id="@+id/tv"    android:layout_width="match_parent"    android:layout_height="40dp"    android:background="#330000ff"    android:gravity="center" /></LinearLayout>
import android.os.Bundle;        import android.os.Handler;        import android.support.v4.widget.SwipeRefreshLayout;        import android.support.v7.app.AppCompatActivity;        import android.support.v7.widget.DividerItemDecoration;        import android.support.v7.widget.GridLayoutManager;        import android.support.v7.widget.LinearLayoutManager;        import android.support.v7.widget.RecyclerView;        import android.support.v7.widget.StaggeredGridLayoutManager;        import android.widget.Toast;        import java.util.ArrayList;        import java.util.List;public class MainActivity extends AppCompatActivity {    private RecyclerView mRv;    private List<String> list = new ArrayList<>();    private SwipeRefreshLayout mSrl;    private MyAdapter myAdapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        //给rv设置布局管理器        //仿listview//        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);        //仿GridView        GridLayoutManager gridLayoutManager = new GridLayoutManager(this, 3);        //瀑布流        StaggeredGridLayoutManager staggeredGridLayoutManager = new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL);        mRv.setLayoutManager(gridLayoutManager);        //添加分割线        mRv.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL));//        mRv.addItemDecoration(new DividerGridItemDecoration(this));        //设置适配器        for (int i = 0; i < 50; i++) {            list.add("Item" + i);        }        //创建适配器        myAdapter = new MyAdapter(MainActivity.this, list);        mRv.setAdapter(myAdapter);        myAdapter.setOnItemListener(new MyAdapter.OnItemListener() {            @Override            public void onItemClick(String str) {                Toast.makeText(MainActivity.this, "点击：" + str, Toast.LENGTH_SHORT).show();            }            @Override            public void onItemLongClick(String str) {                Toast.makeText(MainActivity.this, "长按" + str, Toast.LENGTH_SHORT).show();            }        });    }    private void initView() {        mRv = (RecyclerView) findViewById(R.id.rv);        mSrl = (SwipeRefreshLayout) findViewById(R.id.srl);        //给SwipeRefreshLayout设置下拉监听        mSrl.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {            @Override            public void onRefresh() {                //模拟耗时操作                new Handler().postDelayed(new Runnable() {                    @Override                    public void run() {                        //停止刷新                        mSrl.setRefreshing(false);                        Toast.makeText(MainActivity.this, "刷新成功", Toast.LENGTH_SHORT).show();                    }                }, 3000);            }        });        mRv.setOnScrollListener(new RecyclerView.OnScrollListener() {            @Override            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {                if (newState == RecyclerView.SCROLL_STATE_IDLE) {                    LinearLayoutManager lm = (LinearLayoutManager) mRv.getLayoutManager();                    if (lm.findLastVisibleItemPosition() == list.size() - 1) {                        List<String> moreList = new ArrayList<String>();                        for (int i = 0; i < 10; i++) {                            moreList.add("新添加的数据" + i);                        }                        myAdapter.addMore(moreList);                    }                }            }            @Override            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {                super.onScrolled(recyclerView, dx, dy);            }        });    }}
import android.content.Context;        import android.support.v7.widget.RecyclerView;        import android.view.LayoutInflater;        import android.view.View;        import android.view.ViewGroup;        import android.widget.LinearLayout;        import android.widget.TextView;        import java.util.List;/** * Created by peng on 2017/11/10. */public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {    private Context context;    private List<String> list;    //2、定义一个属性    private OnItemListener onItemListener;    /**     * 1、定义一个接口     */    public interface OnItemListener {        public void onItemClick(String str);        public void onItemLongClick(String str);    }    //3、定义一个方法    public void setOnItemListener(OnItemListener onItemListener) {        this.onItemListener = onItemListener;    }    public MyAdapter(Context context, List<String> list) {        this.context = context;        this.list = list;    }    //1、RecyclerView.Adapter中哪个方法用来展现视图和它的持有者：    @Override    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        //加载写好的item布局        View view = LayoutInflater.from(context).inflate(R.layout.item, parent, false);        return new MyViewHolder1(view);    }    //3、在RecyclerView中负责绑定数据的方法是    @Override    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {        //获取数据        final String s = list.get(position);        MyViewHolder1 myViewHolder1 = (MyViewHolder1) holder;        myViewHolder1.tv.setText(s);        //给布局设置一个点击和长按时间        myViewHolder1.ll.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                onItemListener.onItemClick(s);            }        });        myViewHolder1.ll.setOnLongClickListener(new View.OnLongClickListener() {            @Override            public boolean onLongClick(View v) {                onItemListener.onItemLongClick(s);                return true;            }        });    }    //RecyclerView返回数据条目数的方法是    @Override    public int getItemCount() {        return list.size();    }    //2、第二个要走的方法    class MyViewHolder1 extends RecyclerView.ViewHolder {        private TextView tv;        private LinearLayout ll;        public MyViewHolder1(View itemView) {            super(itemView);            //查找布局里，要显示数据的组件            tv = itemView.findViewById(R.id.tv);            ll = itemView.findViewById(R.id.ll);        }    }    /**     * 添加更多的方法     *     * @param moreList     */    public void addMore(List<String> moreList) {        list.addAll(moreList);        notifyDataSetChanged();    }}
DividerGridItemDecoration
import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Rect;import android.graphics.drawable.Drawable;import android.support.v7.widget.GridLayoutManager;import android.support.v7.widget.RecyclerView;import android.support.v7.widget.RecyclerView.LayoutManager;import android.support.v7.widget.RecyclerView.State;import android.support.v7.widget.StaggeredGridLayoutManager;import android.view.View;/** *  * @author zhy *  */public class DividerGridItemDecoration extends RecyclerView.ItemDecoration{    private static final int[] ATTRS = new int[] { android.R.attr.listDivider };    private Drawable mDivider;    public DividerGridItemDecoration(Context context) {        final TypedArray a = context.obtainStyledAttributes(ATTRS);        mDivider = a.getDrawable(0);        a.recycle();    }    @Override    public void onDraw(Canvas c, RecyclerView parent, State state) {        drawHorizontal(c, parent);        drawVertical(c, parent);    }    private int getSpanCount(RecyclerView parent) {        // 列数        int spanCount = -1;        LayoutManager layoutManager = parent.getLayoutManager();        if (layoutManager instanceof GridLayoutManager) {            spanCount = ((GridLayoutManager) layoutManager).getSpanCount();        } else if (layoutManager instanceof StaggeredGridLayoutManager) {            spanCount = ((StaggeredGridLayoutManager) layoutManager)                    .getSpanCount();        }        return spanCount;    }    public void drawHorizontal(Canvas c, RecyclerView parent) {        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.getLeft() - params.leftMargin;            final int right = child.getRight() + params.rightMargin                    + mDivider.getIntrinsicWidth();            final int top = child.getBottom() + params.bottomMargin;            final int bottom = top + mDivider.getIntrinsicHeight();            mDivider.setBounds(left, top, right, bottom);            mDivider.draw(c);        }    }    public void drawVertical(Canvas c, RecyclerView parent) {        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 top = child.getTop() - params.topMargin;            final int bottom = child.getBottom() + params.bottomMargin;            final int left = child.getRight() + params.rightMargin;            final int right = left + mDivider.getIntrinsicWidth();            mDivider.setBounds(left, top, right, bottom);            mDivider.draw(c);        }    }    private boolean isLastColum(RecyclerView parent, int pos, int spanCount,            int childCount) {        LayoutManager layoutManager = parent.getLayoutManager();        if (layoutManager instanceof GridLayoutManager) {            if ((pos + 1) % spanCount == 0){// 如果是最后一列，则不需要绘制右边                return true;            }        } else if (layoutManager instanceof StaggeredGridLayoutManager) {            int orientation = ((StaggeredGridLayoutManager) layoutManager)                    .getOrientation();            if (orientation == StaggeredGridLayoutManager.VERTICAL) {                if ((pos + 1) % spanCount == 0){// 如果是最后一列，则不需要绘制右边                    return true;                }            } else {                childCount = childCount - childCount % spanCount;                if (pos >= childCount)// 如果是最后一列，则不需要绘制右边                    return true;            }        }        return false;    }    private boolean isLastRaw(RecyclerView parent, int pos, int spanCount,            int childCount) {        LayoutManager layoutManager = parent.getLayoutManager();        if (layoutManager instanceof GridLayoutManager) {            childCount = childCount - childCount % spanCount;            if (pos >= childCount)// 如果是最后一行，则不需要绘制底部                return true;        } else if (layoutManager instanceof StaggeredGridLayoutManager) {            int orientation = ((StaggeredGridLayoutManager) layoutManager)                    .getOrientation();            // StaggeredGridLayoutManager 且纵向滚动            if (orientation == StaggeredGridLayoutManager.VERTICAL) {                childCount = childCount - childCount % spanCount;                // 如果是最后一行，则不需要绘制底部                if (pos >= childCount)                    return true;            } else{// StaggeredGridLayoutManager 且横向滚动                // 如果是最后一行，则不需要绘制底部                if ((pos + 1) % spanCount == 0) {                    return true;                }            }        }        return false;    }    @Override    public void getItemOffsets(Rect outRect, int itemPosition,            RecyclerView parent) {        int spanCount = getSpanCount(parent);        int childCount = parent.getAdapter().getItemCount();        if (isLastRaw(parent, itemPosition, spanCount, childCount)){// 如果是最后一行，则不需要绘制底部            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);        } else if (isLastColum(parent, itemPosition, spanCount, childCount)){// 如果是最后一列，则不需要绘制右边            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());        } else {            outRect.set(0, 0, mDivider.getIntrinsicWidth(),mDivider.getIntrinsicHeight());        }    }}

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