RecycleView 最小实现

package com.example.myapplication;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

import com.example.myapplication.recycleviewdemo.RecycleDemoAdapter;

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

import butterknife.BindView;
import butterknife.ButterKnife;

public class MainActivity extends AppCompatActivity {

    String TAG = "MainActivity";

    @BindView(R.id.recycleview)
    RecyclerView recycleview;

    List<Object> list = new ArrayList<>() ;

    RecycleDemoAdapter adapter ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.rr3);
        ButterKnife.bind(this);

        for(int i=0 ;i<20;i++){
            list.add(new Object()) ;
        }

        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        recycleview.setLayoutManager(layoutManager);

        //可以变化为gridview
        //recycleview.setLayoutManager(new GridLayoutManager(this,1));
        adapter = new RecycleDemoAdapter(this,list);
        recycleview.setAdapter(adapter);
    }


}

 

package com.example.myapplication.recycleviewdemo;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.myapplication.R;
import java.util.List;
import butterknife.BindView;
import butterknife.ButterKnife;

//recycleview  adapter                  泛型传入的类型 就是这个适配器的内部类
public class RecycleDemoAdapter extends RecyclerView.Adapter<RecycleDemoAdapter.ViewHolder> {

    Context content;
    List<Object> list;

    public RecycleDemoAdapter(Context content, List<Object> list) {
        this.content = content;
        this.list = list;
    }

    //创建view holder 的地方
    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(content).inflate(R.layout.rr,viewGroup,false);
        ViewHolder viewHolder = new ViewHolder(view) ;
        return viewHolder;
    }

    //操作item  给item赋值的地方
    @Override
    public void onBindViewHolder(@NonNull ViewHolder viewHolder, int i) {
        viewHolder.textView5.setText(String.valueOf(i)+"  -----");
    }

    //获取数量
    @Override
    public int getItemCount() {
        return list.size();
    }


    class ViewHolder extends RecyclerView.ViewHolder{
        @BindView(R.id.imageView2)
        ImageView imageView2;
        @BindView(R.id.textView3)
        TextView textView3;
        @BindView(R.id.textView4)
        TextView textView4;
        @BindView(R.id.textView5)
        TextView textView5;
        @BindView(R.id.textView6)
        TextView textView6;

         ViewHolder(View view) {
             super(view);
            ButterKnife.bind(this, view);
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:background="@android:color/white"
    android:orientation="vertical"
    android:paddingTop="@dimen/qb_px_5"
    android:paddingBottom="@dimen/qb_px_5"
    android:paddingLeft="@dimen/qb_px_15"
    android:paddingRight="@dimen/qb_px_15"
    android:layout_width="match_parent" android:layout_height="@dimen/qb_px_95">


    <ImageView
        android:id="@+id/imageView2"
        android:scaleType="fitXY"
        android:layout_width="@dimen/qb_px_125"
        android:layout_height="@dimen/qb_px_85"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@mipmap/imag" />

    <TextView
        android:layout_marginStart="@dimen/qb_px_7"
        android:layout_marginLeft="@dimen/qb_px_7"
        android:id="@+id/textView3"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:ellipsize="end"
        android:textSize="@dimen/qb_px_13"
        android:maxLines="1"
        android:text="########"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintLeft_toRightOf="@+id/imageView2"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintStart_toEndOf="@+id/imageView2"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView4"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/qb_px_7"
        android:layout_marginLeft="@dimen/qb_px_7"
        android:layout_marginTop="@dimen/qb_px_6"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:textColor="#A8A5A5"
        android:textSize="@dimen/qb_px_11"
        android:text="80㎡  |  16/16"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/imageView2"
        app:layout_constraintTop_toBottomOf="@+id/textView3" />

    <TextView
        android:id="@+id/textView5"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/qb_px_7"
        android:layout_marginLeft="@dimen/qb_px_7"
        android:layout_marginTop="@dimen/qb_px_7"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:textSize="@dimen/qb_px_11"
        android:textColor="#A8A5A5"
        android:text="随时签约"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/imageView2"
        app:layout_constraintTop_toBottomOf="@+id/textView4" />

    <TextView
        android:id="@+id/textView6"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/qb_px_7"
        android:layout_marginLeft="@dimen/qb_px_7"
        android:text="纯写字楼"
        android:textColor="#A8A5A5"
        android:textSize="@dimen/qb_px_11"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/imageView2" />


</android.support.constraint.ConstraintLayout>

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

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycleview"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    </android.support.v7.widget.RecyclerView>

</LinearLayout>