Android&在recycleview中使用xutils加载网络图片

在recycleview中使用xutils加载网络图片，关于xutils
的使用可以在这篇博客去学习，先看看效果图

在这里直接将java代码讲解，在这里有个刷新的功能，需要添加依赖

 implementation 'com.scwang.smartrefresh:SmartRefreshLayout:1.1.2'  //1.0.5及以前版本的老用户升级需谨慎，API改动过大
    implementation 'com.scwang.smartrefresh:SmartRefreshHeader:1.1.2'  //没有使用特殊Header，可以不加这行

在activity布局中

    <com.scwang.smartrefresh.layout.SmartRefreshLayout
        android:id="@+id/refreshLayout"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintTop_toBottomOf="@+id/search"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintVertical_bias="0.0"
        tools:layout_editor_absoluteX="0dp"
        >

        <com.scwang.smartrefresh.layout.header.ClassicsHeader
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

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

    </com.scwang.smartrefresh.layout.SmartRefreshLayout>

如果不需要则将带Refreshlayout代码删去

import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import com.scwang.smartrefresh.layout.api.RefreshLayout;
import com.scwang.smartrefresh.layout.listener.OnLoadMoreListener;
import com.scwang.smartrefresh.layout.listener.OnRefreshListener;
import com.scwang.smartrefresh.layout.listener.OnRefreshLoadMoreListener;

import org.xutils.common.Callback;
import org.xutils.common.util.DensityUtil;
import org.xutils.http.RequestParams;
import org.xutils.image.ImageOptions;
import org.xutils.view.annotation.ContentView;
import org.xutils.view.annotation.ViewInject;
import org.xutils.x;

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

@ContentView(R.layout.activity_main4_1)
public class Main4Activity_1 extends AppCompatActivity {

    RecyclerView recyclerView;

    MyAdapter myAdapter;

    Message message;


    @ViewInject(R.id.textView33)
    TextView textView3_1;
    @ViewInject(R.id.textView333)
    TextView textView3_2;
    @ViewInject(R.id.textView3333)
    TextView textView3_3;



    List<Message>list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main4_1);

        x.Ext.init(getApplication());
        x.Ext.setDebug(BuildConfig.DEBUG);// 是否输出debug日志, 开启debug会影响性能.
        x.view().inject(Main4Activity_1.this);//没有用到view注解可以先不用
	
	//网络连接
        RequestParams params = new RequestParams("http://148.70.46.9/chatlist");
        x.http().get(params, new Callback.CommonCallback<String>() {
            @Override
            public void onSuccess(String result) {//主线程

	//解析json，获得数据
                Gson gson=new Gson();
                 message=gson.fromJson(result,Message.class);
                Log.i("Main", "onSuccess: "+message.chatlist.get(0).name);
//加载图片
                CircleImageView  headimg3 =findViewById(R.id.headimg);
                ImageOptions imageOptions;
                imageOptions = new ImageOptions.Builder()
                        .setSize(DensityUtil.dip2px(120), DensityUtil.dip2px(120))
                        .setRadius(DensityUtil.dip2px(5))
// 如果ImageView的大小不是定义为wrap_content, 不要crop.
                        .setCrop(true) // 很多时候设置了合适的scaleType也不需要它.
// 加载中或错误图片的ScaleType
//.setPlaceholderScaleType(ImageView.ScaleType.MATRIX)
                        .setImageScaleType(ImageView.ScaleType.CENTER_CROP)
                        .setLoadingDrawableId(R.mipmap.ic_launcher)
                        .setFailureDrawableId(R.mipmap.ic_launcher)
                        .build();
                x.image().bind(headimg3, message.headimg, imageOptions);//一般使用到这就可以


//进行recycleview的设置与实现
                myAdapter = new MyAdapter();
                recyclerView =findViewById(R.id.recycleview);
                recyclerView.setAdapter(new MyAdapter());
                recyclerView.setLayoutManager(new LinearLayoutManager(Main4Activity_1.this));



            }
            @Override
            public void onError(Throwable ex, boolean isOnCallback) {
                Log.i("Main", "onError: "+ex.getMessage());
            }
            @Override
            public void onCancelled(CancelledException cex) {
            }
            @Override
            public void onFinished() {
            }
        });






        recyclerView =findViewById(R.id.recycleview);






        RefreshLayout refreshLayout = findViewById(R.id.refreshLayout);
        refreshLayout.setOnRefreshListener(new OnRefreshListener() {
            @Override
            public void onRefresh(RefreshLayout refreshlayout) {




                myAdapter.notifyDataSetChanged();
                refreshlayout.finishRefresh(2000/*,false*/);//传入false表示刷新失败
            }
        });
        refreshLayout.setOnLoadMoreListener(new OnLoadMoreListener() {
            @Override
            public void onLoadMore(RefreshLayout refreshlayout) {


                myAdapter.notifyDataSetChanged();
                refreshlayout.finishLoadMore(2000/*,false*/);//传入false表示加载失败

            }
        });


    }
    public  class MyViewHolder extends  RecyclerView.ViewHolder{//用来包装每个子项的布局信息
        public TextView textView1;
        public TextView textView2;
        public TextView textView3;
        public  CircleImageView headimag;
        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            textView1 = itemView.findViewById(R.id.textView33);
            textView2 = itemView.findViewById(R.id.textView333);
            textView3 = itemView.findViewById(R.id.textView3333);
            headimag=itemView.findViewById(R.id.headimg3);

        }
    }
    public class  MyAdapter extends RecyclerView.Adapter<MyViewHolder>{
//用来配合recycleview进行加载子项以及填充子项的数据
        @NonNull
        @Override
        public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(Main4Activity_1.this).inflate(R.layout.messages,parent,false);
            MyViewHolder myViewHolder = new MyViewHolder(view);
            return myViewHolder;
        }

        @Override
        public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {//在这里进行子项的文本图片数据填充
            holder.textView1.setText(message.chatlist.get(position).name);
            holder.textView2.setText(message.chatlist.get(position).content);
            holder.textView3.setText(message.chatlist.get(position).time);

            ImageOptions imageOptions;
            imageOptions = new ImageOptions.Builder()
                    .setSize(DensityUtil.dip2px(120), DensityUtil.dip2px(120))
                    .setRadius(DensityUtil.dip2px(5))
// 如果ImageView的大小不是定义为wrap_content, 不要crop.
                    .setCrop(true) // 很多时候设置了合适的scaleType也不需要它.
// 加载中或错误图片的ScaleType
//.setPlaceholderScaleType(ImageView.ScaleType.MATRIX)
                    .setImageScaleType(ImageView.ScaleType.CENTER_CROP)
                    .setLoadingDrawableId(R.mipmap.ic_launcher)
                    .setFailureDrawableId(R.mipmap.ic_launcher)
                    .build();
            x.image().bind(holder.headimag, message.chatlist.get(position).head, imageOptions);//一般使用到这就可以



        }

        @Override
        public int getItemCount() {//返回子项的数目，即加载多少列表项
            return message.chatlist.size();
        }
    }
 }