冲刺二

今天是冲刺的第二天吧，主要做了笔记展示界面的简要设计，效率比较低。

遇到的困难：采用的是recyclerview+卡片式布局，自己光想着展示笔记的详细信息，而没有考虑到安卓屏幕的限制，导致一篇笔记占据屏幕空间过大，而且界面也不好看。

解决思路：只展示笔记的简要信息和标题，具体内容放在另一个界面，通过点击标题进行笔记的查看。

明天计划完成的任务：页面实现下拉刷新

附上编写的代码：

分享大厅主界面（采用recyclerview）：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="作者"
            android:textSize="16sp"/>
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="学科"
            android:textSize="16sp"/>
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="时间"

            android:textSize="16sp"/>
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="年级"
            android:textSize="16sp"/>
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            />
    </LinearLayout>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="搜索"
        android:textSize="16sp">
    </Button>

    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
        android:id="@+id/swipe_refresh_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        >

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/recyclerView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_gravity="center_horizontal|center_vertical"
            >
        </androidx.recyclerview.widget.RecyclerView>

    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
</LinearLayout>

卡片式布局(recyclerview中每个item对应的布局)：

<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="8dp"
    android:id="@+id/cv_item"
    card_view:cardCornerRadius="8dp">
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <ImageView
            android:id="@+id/icon"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:layout_margin="10dp"
            card_view:srcCompat="@drawable/user_logo"
            >
        </ImageView>

        <TextView
            android:id="@+id/writer_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="嘻哈二怪"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="23dp"
            android:textSize="16sp"
            android:layout_toRightOf="@+id/icon"
            >
        </TextView>

        <ImageView
            android:id="@+id/collect"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:layout_margin="5dp"
            card_view:srcCompat="@drawable/shoucang"
            android:layout_alignParentRight="true"
            >
        </ImageView>

        <TextView
            android:id="@+id/course"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="高数"
            android:textSize="17sp"
            android:layout_marginTop="23dp"
            android:layout_marginRight="40dp"
            android:layout_toLeftOf="@+id/collect"
            android:layout_alignBottom="@+id/writer_name"
            />

        <TextView
            android:id="@+id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="15dp"
            android:text="大一上高数第一次整理笔记"
            android:textSize="18sp"
            android:layout_below="@+id/icon"
            android:layout_alignParentLeft="true"
            />
        <TextView
            android:id="@+id/date"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="2020-04-17"
            android:textSize="16sp"
            android:layout_marginTop="20dp"
            android:layout_alignRight="@+id/collect"
            android:layout_marginRight="15dp"
            android:layout_marginBottom="10dp"
            android:layout_alignParentRight="true"
            android:layout_below="@+id/icon"
            />
    </RelativeLayout>
</androidx.cardview.widget.CardView>

适配器

package com.itheima.cloudnotes.adapter;

import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.itheima.cloudnotes.Activity.Detail;
import com.itheima.cloudnotes.R;
import com.itheima.cloudnotes.enity.Note;

import java.util.List;

public class NoteAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>
{
    private List<Note> mNoteList;
    private Context mContext;

    @NonNull
    @Override
    //onCreateViewHolder负责承载每个子项的布局。它有两个参数，其中一个是 int viewType;
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType)
    {
        mContext=parent.getContext();
            View view=LayoutInflater.from(parent.getContext()).inflate(R.layout.recyclerview_item,parent,false);
            return new  RecyclerViewHolder(view);
    }

    //onBindViewHolder负责将每个子项holder绑定数据,俩参数分别是RecyclerView.ViewHolder holder, int position；
    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position)
    {
            RecyclerViewHolder recyclerViewHolder = (RecyclerViewHolder) holder;
            final Note note=mNoteList.get(position);
            recyclerViewHolder.icon.setImageResource(note.getIcon());
            recyclerViewHolder.tv_writer_name.setText(note.getWriter_name());
            recyclerViewHolder.tv_course.setText(note.getCourse());
            recyclerViewHolder.collect.setImageResource(note.getCollect());
            recyclerViewHolder.tv_title.setText(note.getTitle());
            recyclerViewHolder.tv_date.setText(note.getDate());

            recyclerViewHolder.tv_title.setOnClickListener(new View.OnClickListener( ) {
                @Override
                public void onClick(View v) {
                    Intent intent=new Intent(mContext,Detail.class);
                    intent.putExtra("writer_name",note.getWriter_name());
                    mContext.startActivity(intent);
                }
            });

            recyclerViewHolder.collect.setOnClickListener(new View.OnClickListener( ) {
                @Override
                public void onClick(View v) {

                }
            });
       
    }

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

    public NoteAdapter(List<Note> mNoteList) {
        this.mNoteList = mNoteList;
    }

    private class  RecyclerViewHolder extends RecyclerView.ViewHolder{
        View NoteView;
        ImageView icon;
        TextView tv_writer_name;
        TextView tv_course;
        ImageView collect;
        TextView tv_title;
        TextView tv_date;

        public  RecyclerViewHolder(@NonNull View itemView) {
            super(itemView);
            NoteView=itemView;
            icon=itemView.findViewById(R.id.icon);
            tv_writer_name=itemView.findViewById(R.id.writer_name);
            tv_course=itemView.findViewById(R.id.course);
            collect=itemView.findViewById(R.id.collect);
            tv_title=itemView.findViewById(R.id.title);
            tv_date=itemView.findViewById(R.id.date);
        }
    }

}

详细信息页面（很粗糙）

活动加载布局

package com.itheima.cloudnotes;

import android.annotation.SuppressLint;
import android.os.Bundle;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;

import com.itheima.cloudnotes.listener.EndlessRecyclerOnScrollListener;
import com.itheima.cloudnotes.adapter.NoteAdapter;
import com.itheima.cloudnotes.enity.Note;

import java.util.ArrayList;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;

public class MainActivity extends AppCompatActivity {

    private List<Note> noteList=new ArrayList<>();
    private SwipeRefreshLayout srl;
    private RecyclerView recyclerView;
    private NoteAdapter noteAdapter;


    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
    }

 public void init()
    {
        initNotes();
        recyclerView=findViewById(R.id.recyclerView);
        LinearLayoutManager linearLayoutManager=new LinearLayoutManager(this);
        recyclerView.setLayoutManager(linearLayoutManager);
        noteAdapter=new NoteAdapter(noteList);
        recyclerView.setAdapter(noteAdapter);
    }

 public void initNotes()
    {
        for(int i=0;i<5;i++)
        {
            Note note=new Note(R.drawable.user_logo,"胖乎乎瘦高高","高数",R.drawable.shoucang,"常用定积分公式","2020-04-18");
            noteList.add(note);
        }
    }