recyclerview的使用

Posted 2021-03-17 wang-jingyuan

首先初始化

private RecyclerView recycler_view;

private MyAdapter mAdapter;//适配器

recycler_view = (RecyclerView) findViewById(R.id.recycler_view);
        //设置布局管理器
        LinearLayoutManager mLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
        recycler_view.setLayoutManager(mLayoutManager);

　　　　　mAdapter = new MyAdapter(myFeedback);
　　　　　recycler_view.setAdapter(mAdapter);

　　这是要实现的布局

布局

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffffff">

    <include
        android:id="@+id/include"
        layout="@layout/title" />

    <com.scwang.smartrefresh.layout.SmartRefreshLayout
        android:id="@+id/srl_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/include"
        app:srlEnableAutoLoadMore="false">

        <com.scwang.smartrefresh.layout.header.ClassicsHeader
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:srlTextRelease="@string/Refresh" />
        <android.support.v7.widget.RecyclerView
            android:id="@+id/recycler_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_below="@id/include"
            android:fadeScrollbars="false"
            android:nestedScrollingEnabled="false"
            android:scrollbars="none"
            android:visibility="visible" />

        <com.scwang.smartrefresh.layout.footer.ClassicsFooter
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:srlTextPulling="@string/up"
            app:srlTextRelease="@string/Release" />
    </com.scwang.smartrefresh.layout.SmartRefreshLayout>


    <ImageView
        android:id="@+id/iv_add"
        android:layout_width="52dp"
        android:layout_height="52dp"
        android:layout_alignParentRight="true"
        android:layout_alignParentBottom="true"
        android:layout_marginRight="27dp"
        android:layout_marginBottom="16dp"
        android:src="@mipmap/add" />
</RelativeLayout>

　　recyclerview适配器

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    private List<MyFeedbackModel> mydata;

//提供点击事件接口
    public interface OnItemClickLitener {
        void onItemClick(View view, int position);

        void onItemLongClick(View view, int position);
    }

    private OnItemClickLitener mOnItemClickLitener;

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

    public MyAdapter(List<MyFeedbackModel> myFeedback) {
        this.mydata = myFeedback;
    }


    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        // 实例化展示的view
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.item, parent, false);
        // 实例化viewholder
        ViewHolder viewHolder = new ViewHolder(v);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(final ViewHolder holder, int position) {
        // 绑定数据
        MyFeedbackModel myFeedbackModel = mydata.get(position);
        holder.tv_date.setText(getUserDate(myFeedbackModel.getFeedbackTime()));
        holder.tv_reply.setText(myFeedbackModel.getRead());
        holder.tv_who.setText(myFeedbackModel.getSource());
        holder.tv_text.setText(myFeedbackModel.getContent());
        if (myFeedbackModel.getState() == 1){
            holder.tv_solve.setVisibility(View.VISIBLE);

        }else {
            holder.tv_solve.setVisibility(View.GONE);
        }
        if (myFeedbackModel.getMessage().equals("null")) {
            holder.rl_new.setVisibility(View.GONE);
            holder.tv_text2.setVisibility(View.VISIBLE);
            //用户无回复
            holder.tv_text2.setTextColor(0xffbebebe);
            holder.tv_text2.setPadding(14, 6, 14, 6);
//                holder.tv_text2.setBackgroundResource(R.drawable.read);
            holder.tv_text2.setText("暂无回复");
        } else {
            holder.rl_new.setVisibility(View.VISIBLE);
            holder.tv_text2.setVisibility(View.GONE);
            if (myFeedbackModel.getCreateTime().equals("null")) {
                holder.tv_date1.setText("0");
            } else {
                holder.tv_date1.setText(getUserDate(Long.parseLong(myFeedbackModel.getCreateTime())));
            }
            //0：用户 1：平台
            if (myFeedbackModel.getSource().equals("0")) {
                holder.tv_who1.setText("我:");
                holder.tv_who1.setTextColor(0xff333333);
                //用户
                String[] strArray = myFeedbackModel.getMessage().split(".");
                int suffixIndex = strArray.length - 1;
//            System.out.println(strArray[suffixIndex]);
                if (strArray[suffixIndex].equals("png") || strArray[suffixIndex].equals("jpg")) {
                    holder.tv_text1.setText("[图片]");
                    holder.tv_text1.setTextColor(0xff333333);
                } else {
                    holder.tv_text1.setText(myFeedbackModel.getMessage());
                    holder.tv_text1.setTextColor(0xff333333);
                }
            } else {
                //平台
                String[] strArray = myFeedbackModel.getMessage().split(".");
                int suffixIndex = strArray.length - 1;
                if (strArray[suffixIndex].equals("png") || strArray[suffixIndex].equals("jpg")) {
                    holder.tv_text1.setText("[图片]");
                    holder.tv_text1.setTextColor(0xff5973f6);
                } else {
                    holder.tv_text1.setText(myFeedbackModel.getMessage());
                    holder.tv_text1.setTextColor(0xff5973f6);
                }
                holder.tv_who1.setText("客服:");
                holder.tv_who1.setTextColor(0xff5973f6);
            }

            if (myFeedbackModel.getSource().equals("0")) {
            } else {
                if (myFeedbackModel.getRead().equals("0")) {
                    //top3  left7
                    holder.tv_reply1.setTextColor(0xfffefefe);
                    holder.tv_reply1.setPadding(14, 0, 14, 0);
                    holder.tv_reply1.setBackgroundResource(R.drawable.unread);
                    holder.tv_reply1.setText("未读");
                } else if (myFeedbackModel.getRead().equals("1")) {
                    holder.tv_reply1.setTextColor(0xfffefefe);
                    holder.tv_reply1.setPadding(14, 0, 14, 0);
                    holder.tv_reply1.setBackgroundResource(R.drawable.read);
                    holder.tv_reply1.setText("已读");
                } else {
                    holder.tv_reply1.setTextColor(0xffbebebe);
                    holder.tv_reply1.setPadding(14, 0, 14, 0);
                    holder.tv_reply1.setBackgroundResource(R.drawable.read);
                    holder.tv_reply1.setText("暂无回复");
                }
            }
        }
        // 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;
                }
            });
        }
    }

//用于转换时间
    public static String getUserDate(long sformat) {
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String sd = formatter.format(new Date(sformat));   // 时间戳转换成时间     (这里也是毫秒时间戳)
        return sd;
    }


    @Override
//判断有多少个item
//问号表达式说明

形式：条件表达式 ？程序块1 ：程序块2 ；

含义：如果条件表达式为真，则本程序语句执行程序块1，程序块1的值即为整个表达式的值， 否则为表达式2的值。

value.toArray(new String[value==null?0:value.size()]));

    public int getItemCount() {
        return mydata == null ? 0 : mydata.size();
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {

        TextView tv_date, tv_reply, tv_who, tv_text, tv_date1, tv_reply1, tv_who1, tv_text1, tv_text2,tv_solve;
        RelativeLayout rl_new;

        public ViewHolder(View itemView) {
            super(itemView);
            //日期
            tv_date = (TextView) itemView.findViewById(R.id.tv_date);
            //暂无回复
            tv_reply = (TextView) itemView.findViewById(R.id.tv_reply);
            //谁说的话
            tv_who = (TextView) itemView.findViewById(R.id.tv_who1);
            //文本
            tv_text = (TextView) itemView.findViewById(R.id.tv_text);
            //新消息日期
            tv_date1 = itemView.findViewById(R.id.tv_date1);
            //标签
            tv_reply1 = itemView.findViewById(R.id.tv_reply1);
            //平台 or 用户
            tv_who1 = itemView.findViewById(R.id.tv_who1);
            //新消息
            tv_text1 = itemView.findViewById(R.id.tv_text1);
            //新消息布局
            rl_new = itemView.findViewById(R.id.rl_new);
            //平台和用户都没有消息显示这个
            tv_text2 = itemView.findViewById(R.id.tv_text2);
            //已解决
            tv_solve = itemView.findViewById(R.id.tv_solve);
        }
    }
}

　　工具类自己写 主要是从接口获取到的数据（写完参数快捷生成get，set方法 Alt+insert）

第一个参数是创建 构造函数

第四个是创建get，set方法

public class MyFeedbackModel {
    //反馈序列号
    String serialNumber;
    //回复时间
    String createTime;
    //当前返回状态(0:未解决；1:已解决；2:已搁置)
    int state;
    //最新回复内容
    String message;
    //反馈内容
    String content;
    //0:未读；1:已读
    String read;
    //消息类型(0:文本；1:图片；；2：系统)
    String type;
    //消息来源(0:用户；1:平台)
    String source;
    //反馈创建时间
    long feedbackTime;
    private String img1;
    private String img2;
    private String img3;

    public MyFeedbackModel(String serialNumber, String createTime, int state, String message, String content, String read, String type, String source, long feedbackTime, String img1, String img2, String img3) {
        this.serialNumber = serialNumber;
        this.createTime = createTime;
        this.state = state;
        this.message = message;
        this.content = content;
        this.read = read;
        this.type = type;
        this.source = source;
        this.feedbackTime = feedbackTime;
        this.img1 = img1;
        this.img2 = img2;
        this.img3 = img3;
    }

    public String getImg1() {
        return img1;
    }

    public void setImg1(String img1) {
        this.img1 = img1;
    }

    public String getImg2() {
        return img2;
    }

    public void setImg2(String img2) {
        this.img2 = img2;
    }

    public String getImg3() {
        return img3;
    }

    public void setImg3(String img3) {
        this.img3 = img3;
    }

    public String getSerialNumber() {
        return serialNumber;
    }

    public void setSerialNumber(String serialNumber) {
        this.serialNumber = serialNumber;
    }

    public String getCreateTime() {
        return createTime;
    }

    public void setCreateTime(String createTime) {
        this.createTime = createTime;
    }

    public int getState() {
        return state;
    }

    public void setState(int state) {
        this.state = state;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public String getRead() {
        return read;
    }

    public void setRead(String read) {
        this.read = read;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public String getSource() {
        return source;
    }

    public void setSource(String source) {
        this.source = source;
    }

    public long getFeedbackTime() {
        return feedbackTime;
    }

    public void setFeedbackTime(long feedbackTime) {
        this.feedbackTime = feedbackTime;
    }
}