展示一下今天要給大家分享的程式碼效果

先整個xml佈局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height
 
="match_parent"
    tools:context="sizu.wuxiaorui20171013.MainActivity">
    <LinearLayout
        android:id="@+id/app_top"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <Button
            android:id
 
="@+id/add"
            style="@style/AppButton"
            android:text="新增"
            />
        <Button
            android:id="@+id/del"
            style="@style/AppButton"
            android:text="刪除"
            />
        <Button
            android:id="@+id/list"
            style="@style/AppButton"
 

            android:text="List"
            />
        <Button
            android:id="@+id/grid"
            style="@style/AppButton"
            android:text="Grid"
            />
        <Button
            android:id="@+id/flow"
            style="@style/AppButton"
            android:text="流氏"
            />
    </LinearLayout>
    <android.support.v7.widget.RecyclerView
        android:id="@+id/id_recyclerview"
        android:dividerHeight="10dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/app_top"
        />
</RelativeLayout>

然後把OKhttp要是用的工具包utils與app工具包複製到工程

擴充套件butterknife 工具使用

第一步（工程裡的buildgradle）

classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'

app專案中的buildgradle

apply plugin: 'android-apt'

app專案中的buildgradle加的依賴

compile 'com.jakewharton:butterknife:8.2.1'
apt 'com.jakewharton:butterknife-compiler:8.2.1'

主類裡面初始化
以下是app專案中的buildgradle加的所有依賴

    testCompile 'junit:junit:4.12'
    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'
    compile 'com.jakewharton:butterknife:8.2.1'
    apt 'com.jakewharton:butterknife-compiler:8.2.1'
    compile files('libs/universal-image-loader-1.9.3.jar')
    compile 'com.squareup.okio:okio:1.5.0'
    compile 'com.squareup.okhttp3:okhttp:3.2.0'
    compile 'com.squareup.okhttp3:logging-interceptor:3.4.1'
    compile files('libs/gson-2.3.1.jar')

在配置清單中新增許可權

<uses-permission android:name="android.permission.INTERNET"></uses-permission>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>

在application中加app的許可權

android:name="MyApp.MyApp"

然後建立幾個工具類

DividerGridItemDecoration

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, RecyclerView.State state)
    {

        drawHorizontal(c, parent);
        drawVertical(c, parent);

    }

    private int getSpanCount(RecyclerView parent)
    {
        // 列數
        int spanCount = -1;
        RecyclerView.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)
    {
        RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
        if (layoutManager instanceof GridLayoutManager)
        {
            if ((pos + 1) % spanCount == 0)// 如果是最後一列，則不需要繪製右邊
            {
                return true;
            }
        } else if (layoutManager instanceof StaggeredGridLayoutManager)
        {
            int orientation = ((StaggeredGridLayoutManager) layoutManager)
                    .getOrientation();
            if (orientation == StaggeredGridLayoutManager.VERTICAL)
            {
                if ((pos + 1) % spanCount == 0)// 如果是最後一列，則不需要繪製右邊
                {
                    return true;
                }
            } else
            {
                childCount = childCount - childCount % spanCount;
                if (pos >= childCount)// 如果是最後一列，則不需要繪製右邊
                    return true;
            }
        }
        return false;
    }

    private boolean isLastRaw(RecyclerView parent, int pos, int spanCount,
                              int childCount)
    {
        RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
        if (layoutManager instanceof GridLayoutManager)
        {
            childCount = childCount - childCount % spanCount;
            if (pos >= childCount)// 如果是最後一行，則不需要繪製底部
                return true;
        } else if (layoutManager instanceof StaggeredGridLayoutManager)
        {
            int orientation = ((StaggeredGridLayoutManager) layoutManager)
                    .getOrientation();
            // StaggeredGridLayoutManager 且縱向滾動
            if (orientation == StaggeredGridLayoutManager.VERTICAL)
            {
                childCount = childCount - childCount % spanCount;
                // 如果是最後一行，則不需要繪製底部
                if (pos >= childCount)
                    return true;
            } else
            // StaggeredGridLayoutManager 且橫向滾動
            {
                // 如果是最後一行，則不需要繪製底部
                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))// 如果是最後一行，則不需要繪製底部
        {
            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
        } else if (isLastColum(parent, itemPosition, spanCount, childCount))// 如果是最後一列，則不需要繪製右邊
        {
            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
        } else
        {
            outRect.set(0, 0, mDivider.getIntrinsicWidth(),
                    mDivider.getIntrinsicHeight());
        }
    }

DividerItemDecoration

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) {

        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);
        }
    }

SpacesItemDecoration（設定間距）

public class SpacesItemDecoration extends RecyclerView.ItemDecoration {

    private int space;

    public SpacesItemDecoration(int space) {
        this.space=space;
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        outRect.left=space;
        outRect.right=space;
        outRect.bottom=space;
        if(parent.getChildAdapterPosition(view)==0){
            outRect.top=space;
        }
    }

OnItemClickLitener

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

MainActivity

private RecyclerView mRecyclerView;
    private List<String> mDatas;
    private HomeAdapter mAdapter;
    private String gsonFrom="你的網路資料介面";
    private boolean isPubu = false;
    private List<MyGsonFr.NewslistBean> data;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        /*獲得RecyclerView的id*/
        mRecyclerView = (RecyclerView) findViewById(R.id.id_recyclerview);
        initData();

        /*自定義分割線*/
        mRecyclerView.addItemDecoration(new DividerGridItemDecoration(this));

        //設定Item增加、移除動畫
        mRecyclerView.setItemAnimator(new DefaultItemAnimator());

//設定item之間的間隔
        SpacesItemDecoration decoration = new SpacesItemDecoration(16);
        mRecyclerView.addItemDecoration(decoration);




    }

    protected void initData() {
        /*mDatas = new ArrayList<String>();
        for (int i = 'A'; i < 'z'; i++) {
            mDatas.add("" + (char) i);
        }*/
        OkHttp3Utils.getInstance().doGet(gsonFrom, new GsonObjectCallback<MyGsonFr>(){

            @Override
            public void onUi(MyGsonFr myGsonfr) {
                data=new ArrayList<MyGsonFr.NewslistBean>();
                data=myGsonfr.getNewslist();
                mRecyclerView.setAdapter(mAdapter = new HomeAdapter());
                mAdapter.setOnItemClickLitener(new OnItemClickLitener()
                {

                    @Override
                    public void onItemClick(View view, int position)
                    {
                        Toast.makeText(MainActivity.this, position + " click",
                                Toast.LENGTH_SHORT).show();
                    }

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

            }

            @Override
            public void onFailed(Call call, IOException e) {

            }
        });
    }

    @OnClick({R.id.add, R.id.del, R.id.list, R.id.grid, R.id.flow})
    public void onViewClicked(View view) {
        switch (view.getId()) {
            case R.id.add:
                mDatas.add(1, "Insert One");
                mAdapter.notifyItemInserted(1);
                break;
            case R.id.del:
                data.remove(1);
                mAdapter.notifyItemRemoved(1);
                break;
            case R.id.list:
                isPubu = false;
                //        listview佈局
                mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
                break;
            case R.id.grid:
                isPubu = false;
                //        Gridview佈局
                mRecyclerView.setLayoutManager(new GridLayoutManager(this,4));
                break;
            case R.id.flow:
                isPubu = true;
                //        瀑布式佈局
                mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL));
                break;
        }
    }

    class HomeAdapter extends RecyclerView.Adapter<HomeAdapter.MyViewHolder> {

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


        private OnItemClickLitener mOnItemClickLitener;

        public void setOnItemClickLitener(OnItemClickLitener mOnItemClickLitener)
        {
            this.mOnItemClickLitener = mOnItemClickLitener;
        }
        @Override
        public void onBindViewHolder(final MyViewHolder holder, int position) {
            holder.tv.setText(data.get(position).getTitle());
            if (isPubu){
                ViewGroup.LayoutParams layoutParams = holder.tv.getLayoutParams();
                double v = Math.random() * 100;
                layoutParams.height = (int) v;
                holder.tv.setLayoutParams(layoutParams);
            }
            // 如果設定了回撥，則設定點選事件
            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 data.size();
        }
        public void addData(int position) {
            data.add(position, new MyGsonFr.NewslistBean("Insert One","","","",""));
            notifyItemInserted(position);
        }

        public void removeData(int position) {
            data.remove(position);
            notifyItemRemoved(position);
        }
        class MyViewHolder extends RecyclerView.ViewHolder {

            TextView tv;

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

item_home（item中的佈局）

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:background="#44ff0000"
    android:layout_height="wrap_content" >

    <TextView
        android:id="@+id/id_num"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:gravity="center"
        android:text="1" />
</FrameLayout>

drawable（樣式）

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >

    <gradient
        android:centerColor="#ff00ff00"
        android:endColor="#ff0000ff"
        android:startColor="#ffff0000"
        android:type="linear" />
    <size android:height="4dp"/>

</shape>

最後提醒：網路資料介面您自己供應

謝謝觀看，小編祝大家生活愉快！(多多關注小編，會有非常之多精彩分享哦！)