RecyclerView+ButterKnife点击按钮进行布局切换与添加删除

一.先依赖关于ButterKnife的包和RecycleView的包
ButterKnife:
1. 在project下的build.gradle中粘贴以下代码
classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
2.在app下的build.gradle中粘贴以下代码
粘贴在最上面 :
apply plugin: 'android-apt'
粘贴在dependencies{}里:
compile 'com.jakewharton:butterknife:8.4.0'
apt 'com.jakewharton:butterknife-compiler:8.4.0'
RecycleView
在app下的build.gradle中粘贴以下代码

    compile 'com.android.support:mediarouter-v7:25.0.0'
    compile 'com.android.support:appcompat-v7:25.0.0'
    compile 'com.android.support:recyclerview-v7:25.0.0'

二.现在进行写代码

activity_main.XML

    id="@+id/buttons"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        id="@+id/add"
        android:text="添加"
        android:layout_weight="1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

        id="@+id/delete"
            android:text="删除"
            android:layout_weight="1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        id="@+id/list"
            android:text="list"
            android:layout_weight="1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        id="@+id/grid"
            android:text="grid"
            android:layout_weight="1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        id="@+id/flow"
            android:text="flow"
            android:layout_weight="1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

    

    "@+id/buttons"
        android:id="@+id/id_recyclerview"
        android:divider="#ffff0000"
        android:dividerHeight="10dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

item.XML(子布局)

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:background="#44ff0000"
    android:layout_height="wrap_content"
    android:layout_margin="5dp">

    <TextView
        android:id="@+id/id_num"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="1" />
FrameLayout>

创建一个DividerItemDecoration抽象类(这是以listview形式显示)

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.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;

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);
        }
    }

}

创建一个DividerGridItemDecoration类(这是以GridView形式显示)

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;

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());
        }
    }

}

创建一个OnItemClickLitener点击的接口类

public interface OnItemClickLitener
{
    void onItemClick(View view, int position);
    void onItemLongClick(View view , int position);
}

在MainActivity中完成生成ButterKnife,然后进行其他操作

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
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.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;

public class MainActivity extends AppCompatActivity {

    @BindView(R.id.add)
    Button add;
    @BindView(R.id.delete)
    Button delete;
    @BindView(R.id.list)
    Button list;
    @BindView(R.id.grid)
    Button grid;
    @BindView(R.id.flow)
    Button flow;
    @BindView(R.id.activity_main)
    RelativeLayout activityMain;
    private RecyclerView mRecyclerView;
    private List mDatas;
    private HomeAdapter mAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);

        initData();
        mRecyclerView = (RecyclerView) findViewById(R.id.id_recyclerview);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        mRecyclerView.setAdapter(mAdapter = new HomeAdapter());

        /*调用点击事件*/
        mAdapter.setOnItemClickLitener(new OnItemClickLitener() {

            //单击事件
            @Override
            public void onItemClick(View view, int position)
            {
                Toast.makeText(MainActivity.this, position + " click",
                        Toast.LENGTH_SHORT).show();
            }
            //长按事件
            @Override
            public void onItemLongClick(View view, int position)
            {
                Toast.makeText(MainActivity.this, position + " long click",
                        Toast.LENGTH_SHORT).show();
                mAdapter.removeData(position);
            }
        });

    }

    /*模拟数据*/
    protected void initData()
    {
        mDatas = new ArrayList();
        for (int i = 'A'; i < 'z'; i++)
        {
            mDatas.add("" + (char) i);
        }
    }

    /*由ButterKnife生成的快捷按钮*/
    @OnClick({R.id.add, R.id.delete, R.id.list, R.id.grid, R.id.flow})
    public void onViewClicked(View view) {
        switch (view.getId()) {
            case R.id.add:
                mAdapter.addData(1);
                break;
            case R.id.delete:
                mAdapter.removeData(1);
                break;
            case R.id.list:
                mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
                break;
            case R.id.grid:
                mRecyclerView.setLayoutManager(new GridLayoutManager(this, 4));
                break;
            case R.id.flow:
                mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(4, StaggeredGridLayoutManager.VERTICAL));
                break;
        }
    }

    /*适配器*/
    class HomeAdapter extends RecyclerView.Adapter {

        private OnItemClickLitener mOnItemClickLitener;

        public void setOnItemClickLitener(OnItemClickLitener mOnItemClickLitener)
        {
            this.mOnItemClickLitener = mOnItemClickLitener;
        }


        public void addData(int position) {
            mDatas.add(position, "Insert One");
            notifyItemInserted(position);
        }

        public void removeData(int position) {
            mDatas.remove(position);
            notifyItemRemoved(position);
        }

        @Override
        public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            MyViewHolder holder = new MyViewHolder(LayoutInflater.from(
                    MainActivity.this).inflate(R.layout.item, parent,
                    false));

            return holder;
        }

        @Override
        public void onBindViewHolder(final MyViewHolder holder, int position) {
            holder.tv.setText(mDatas.get(position));
            Random radom = new Random();
            ViewGroup.LayoutParams layoutParams = holder.tv.getLayoutParams();
            layoutParams.height = radom.nextInt(200) + 50;
            holder.tv.setLayoutParams(layoutParams);

            // 如果设置了回调，则设置点击事件
            if (mOnItemClickLitener != null)
            {
                holder.itemView.setOnClickListener(new View.OnClickListener()
                {
                    @Override
                    public void onClick(View v)
                    {
                        int pos = holder.getLayoutPosition();
                        mOnItemClickLitener.onItemClick(holder.itemView, pos);
                    }
                });

                holder.itemView.setOnLongClickListener(new View.OnLongClickListener()
                {
                    @Override
                    public boolean onLongClick(View v)
                    {
                        int pos = holder.getLayoutPosition();
                        mOnItemClickLitener.onItemLongClick(holder.itemView, pos);
                        return false;
                    }
                });
            }

        }

        @Override
        public int getItemCount() {
            return mDatas.size();
        }

        class MyViewHolder extends RecyclerView.ViewHolder {

            TextView tv;

            public MyViewHolder(View view) {
                super(view);
                tv = (TextView) view.findViewById(R.id.id_num);
            }
        }
    }

}