Android&在recycleview中使用xutils加载网络图片移动开发qq43520913的博客-

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("https://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(); } } }