RecyClerView和CardView的使用

RecyClerView和CardView已经出来很久了,只是一直没有时间去研究,最近公司做的项目个人感觉ui实在太丑...屋里吐槽

 

 

代码实现,RecyClerView替代ListView   CardView可以看成是一个布局 

    记得一定要导入相关的包,否则无法运行

 

 

主布局文件

<android.support.v7.widget.RecyclerView
     xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/recyclerView"
        android:scrollbars="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"

        />

 

list的布局文件  一定要加上 xmlns:card_view="http://schemas.android.com/apk/res-auto"  否则card_view的属性无法添加

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    card_view:cardBackgroundColor="@color/material_blue_grey_800"
    card_view:cardCornerRadius="5dp"
    card_view:cardPreventCornerOverlap="true"

    >

    <RelativeLayout
        android:layout_marginTop="10dp"
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:background="#f7f7f7"
        android:id="@+id/recyclerView_list_id">


        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/imageView"
            android:src="@drawable/sc_action_left"
            android:layout_centerVertical="true"
             />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:text="中间的文字"
            android:id="@+id/textView"
            android:layout_above="@+id/textView2"
            android:layout_toLeftOf="@+id/textView2"
            android:layout_toStartOf="@+id/textView2"
            android:layout_marginRight="57dp"
             />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:text="后面的文字"
            android:id="@+id/textView2"
            android:layout_alignBottom="@+id/imageView"
            android:layout_alignParentRight="true"

             />
    </RelativeLayout>

</android.support.v7.widget.CardView>

 

 

Activity的代码

package com.example.administrator.degsin;

import android.app.Activity;
import android.os.Bundle;
import android.os.SystemClock;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

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

/**
 * RecyclerView的使用,话说这个类可以替代ListView,还可以实现下拉刷新,感觉很强大有没有
 */
public class MainActivity extends Activity {

    private RecyclerView recyclerView;
    private LinearLayoutManager linearLayoutManager;
    private RecyclerViewAdapter adapter;
    private List<User> mlist = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //1,创建对象
        recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        //将RecyclerView设置成横向(竖向也可以)
        //2,创建布局管理器
        linearLayoutManager = new LinearLayoutManager(MainActivity.this);
        //3,设置布局管理器的组件方向
        // linearLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);//水平方向
        linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);//垂直方向
        //4,设置RecyclerView的布局管理
        recyclerView.setLayoutManager(linearLayoutManager);

        //设置原始数据
        if (mlist == null) {
            mlist = new ArrayList<User>();
            for (int i = 0; i < 20; i++) {
                User u = new User();
                u.setT_date("" + SystemClock.elapsedRealtime());
                u.setT_user("百合不是茶");
                mlist.add(u);
            }
        }

        //5,设置数据源,使用RecyclerView的Adapter
        adapter = new RecyclerViewAdapter();
        //设置数据源
        recyclerView.setAdapter(adapter);
    }

    /**
     * RecyclerView的适配器类
     * 快速导入相关的包快捷键 ctrl+o
     * 格式化形式优化代码 ctrl+alt+l
     */
    class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {

        //创建ViewHolder继承RecyclerView.ViewHolder类
        public class ViewHolder extends RecyclerView.ViewHolder {
            private ImageView imageView;
            private TextView t1;
            private TextView t2;

            public ViewHolder(View view_list) {
                super(view_list);
                imageView = (ImageView) view_list.findViewById(R.id.imageView);
                t1 = (TextView) view_list.findViewById(R.id.textView);
                t2 = (TextView) view_list.findViewById(R.id.textView2);
            }
        }


        @Override
        public int getItemCount() {
            //判断是否为0
            if (mlist.size() == 0) {
                return 0;
            }
            return mlist.size();
        }

        @Override
        public void onBindViewHolder(RecyclerViewAdapter.ViewHolder viewHolder, int i) {
           User obj =mlist.get(i);
            viewHolder.t1.setText(obj.getT_date());
            viewHolder.t2.setText(obj.getT_user()+i);
        }


        @Override
        public RecyclerViewAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
            //获得布局对象,类似与ListView中的getView()

            View view_list = LayoutInflater.from(MainActivity.this).inflate(R.layout.recyclerview_list, null);

            ViewHolder viewHolder = new ViewHolder(view_list);
            return viewHolder;
        }

        public void add_list(User item, int position) {
            mlist.add(position, item);
            notifyItemInserted(position);
        }

        public void removes(User item) {
            int position = mlist.indexOf(item);
            mlist.remove(position);
            notifyItemRemoved(position);
        }
    }


    class User {
        private String t_date;
        private String t_user = "百合不是茶";

        public String getT_date() {
            return t_date;
        }

        public String getT_user() {
            return t_user;
        }

        public void setT_date(String t_date) {
            this.t_date = t_date;
        }

        public void setT_user(String t_user) {
            this.t_user = t_user;
        }


    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}