Android：RecyclerView嵌套CardView应用

雨点打透心脏的1/2处 2022-08-21 05:51 166阅读 0赞

MainActivity中的代码：

package com.myapplication.cardviewdemo;
    
    import android.os.Bundle;
    import android.support.v7.app.AppCompatActivity;
    import android.support.v7.widget.LinearLayoutManager;
    import android.support.v7.widget.RecyclerView;
    import android.text.TextUtils;
    import android.util.Log;
    
    import com.alibaba.fastjson.JSON;
    import com.alibaba.fastjson.JSONArray;
    import com.alibaba.fastjson.JSONObject;
    import com.squareup.okhttp.Call;
    import com.squareup.okhttp.Callback;
    import com.squareup.okhttp.OkHttpClient;
    import com.squareup.okhttp.Request;
    import com.squareup.okhttp.Response;
    import com.zhy.http.okhttp.OkHttpUtils;
    import com.zhy.http.okhttp.callback.StringCallback;
    
    import java.io.IOException;
    import java.util.ArrayList;
    import java.util.List;
    
    /** * 卡片布局 * 有圆角的布局 * <p/> * RecyclerView基本使用 * 步骤：1.引入依赖的包 * compile 'com.android.support:recyclerview-v7:22.2.1' * 2.在布局里面引入控件 * 3.代码里面查找控件 * 4.创建适配器 * 5.设置适配器 */
    public class MainActivity extends AppCompatActivity { 
        private String path = "http://api.fengniao.com/app_ipad/news_jingxuan.php?appImei=99000505856649&osType=Android&osVersion=4.1.1&page=1";
        private List<Bean> list = new ArrayList<>();
        private RecyclerView recyclerView;
        private MyAdapter adapter;
        //控制布局显示的参数
        private RecyclerView.LayoutManager layoutManager;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            init();
            getHttp(path);
            //getHttpFast(path);
        }
    
        private void init() {
            recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
            //设置显示所要显示的布局
            layoutManager = new LinearLayoutManager(this//上下文
                    , LinearLayoutManager.VERTICAL//线性布局显示的方向
                    , true//设置显示内容是否反转
            );
            //设置布局显示的参数
            recyclerView.setLayoutManager(layoutManager);
    
            adapter = new MyAdapter(list, this);
            recyclerView.setAdapter(adapter);
        }
    
    
        //原生态OkHttp下载工具
        private void getHttp(String path) {
            OkHttpClient okHttpClient = new OkHttpClient();
            Request request = new Request
                    .Builder()
                    .url(path)
                    .build();
            Call call = okHttpClient.newCall(request);
            //请求加入调度
            call.enqueue(new Callback() {
                @Override
                public void onFailure(Request request, IOException e) {
                    Log.e("===", "getHttp_onError" + e.getMessage());
                }
    
                @Override
                public void onResponse(Response response) throws IOException {
                    String jsonString = response.body().string();
                    if (!TextUtils.isEmpty(jsonString)) {
                        List<Bean> beanList = jsonToList(jsonString);
                        list.clear();
                        list.addAll(beanList);
                        //list.addAll(jsonToList(jsonString));
                        //此时是在子线程，通知主线程更新数据
                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                adapter.notifyDataSetChanged();
                            }
                        });
                    }
                }
            });
        }
    
        //用fastJson解析字符串
        private List<Bean> jsonToList(String s) {
            JSONObject object = JSON.parseObject(s);
            JSONArray array = object.getJSONArray("160120");
            List<Bean> beanList = JSON.parseArray(array.toString(), Bean.class);
            return beanList;
        }
    
        //下载json字符串。这是hongyang大神封装好的工具。详见：https://github.com/hongyangAndroid/okhttp-utils
        private void getHttpFast(String path) {
            OkHttpUtils.get()
                    .url(path)
                    .build()
                    .execute(new StringCallback() {
                        @Override
                        public void onError(okhttp3.Call call, Exception e) {
                            Log.e("===", "getHttpFast_onError" + e.getMessage());
                        }
    
                        @Override
                        public void onResponse(String response) {
                            if (!TextUtils.isEmpty(response)) {
                                List<Bean> beanList = jsonToList(response);
                                list.clear();
                                list.addAll(beanList);
                            }
                        }
                    });
        }
    }

MyAdapter中的代码：

package com.myapplication.cardviewdemo;
    
    import android.content.Context;
    import android.graphics.Bitmap;
    import android.support.v7.widget.RecyclerView;
    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.zhy.http.okhttp.OkHttpUtils;
    import com.zhy.http.okhttp.callback.BitmapCallback;
    
    import java.util.List;
    
    import okhttp3.Call;
    
    /** * Created by Administrator on 2016/3/16. * 1.继承RecyclerView.Adapter<这里写holder>(一个写自己创建的，用原生的后面赋值的时候转) * 2.实现继承之后的方法 * <p/> * getItemCount显示条目个数 * onCreateViewHolder创建一个布局holder进行绑定 * onBindViewHolder数据绑定 */
    public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> { 
        private List<Bean> list;
        private LayoutInflater mInflater;
    
        public MyAdapter(List<Bean> list, Context context) {
            this.list = list;
            mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }
    
        //创建holder进行绑定
        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            //加载出item布局
            View view = mInflater.inflate(R.layout.item, parent, false);
            //将创建的布局设置给holder,进行绑定
            MyHolder holder = new MyHolder(view);
            return holder;
        }
    
        //数据设置
        @Override
        public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position) {
            //设置具体数据
            String title = list.get(position).getTitle();//文章标题
            ((MyHolder) holder).textView.setText(title);
            String pic_url = list.get(position).getPic_url();//图片网络地址
            //下载图片
            OkHttpUtils
                    .get()
                    .url(pic_url)
                    .build()
                    .execute(new BitmapCallback() {
                        @Override
                        public void onError(Call call, Exception e) {
                            Log.e("===", "onError" + e.getMessage());
                        }
    
                        @Override
                        public void onResponse(Bitmap response) {
                            ((MyHolder) holder).imageView.setImageBitmap(response);
                        }
                    });
        }
    
        @Override
        public int getItemCount() {
            return list.size();
        }
    
        //写一个自己的holder继承Recyclerview.ViewHolder
        public class MyHolder extends RecyclerView.ViewHolder { 
            private ImageView imageView;
            private TextView textView;
    
            public MyHolder(View itemView) {
                super(itemView);
                imageView = (ImageView) itemView.findViewById(R.id.img_show);
                textView = (TextView) itemView.findViewById(R.id.text_show);
            }
        }
    }

main\_activity中代码：

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout 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" tools:context="com.myapplication.cardviewdemo.MainActivity" >
    
        <android.support.v7.widget.RecyclerView android:id="@+id/recyclerView" android:layout_width="match_parent" android:layout_height="match_parent" />
    </RelativeLayout>

item中的代码：

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:padding="40dp" >
    
        <android.support.v7.widget.CardView xmlns:card="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#ff0000" card:cardCornerRadius="30dp" card:cardElevation="24dp" >
    
            <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" >
    
                <ImageView android:id="@+id/img_show" android:layout_width="50dp" android:layout_height="50dp" android:layout_gravity="center" android:src="@mipmap/ic_launcher" />
    
                <TextView android:id="@+id/text_show" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/img_show" android:layout_gravity="center" />
            </LinearLayout>
        </android.support.v7.widget.CardView>
    </LinearLayout>

注意build.gradle中追加：

dependencies {
        compile fileTree(dir: 'libs', include: ['*.jar'])
        testCompile 'junit:junit:4.12'
        compile 'com.android.support:appcompat-v7:22.2.1'
        compile 'com.android.support:cardview-v7:22.2.1'
        compile 'com.android.support:recyclerview-v7:22.2.1'
        compile 'com.squareup.okhttp:okhttp:2.4.0'
        compile 'com.squareup.okio:okio:1.5.0'
        compile files('libs/okio-1.6.0.jar')
        compile files('libs/fastjson-1.1.33.jar')
        compile 'com.zhy:okhttputils:2.3.8'
    }

libs中添加libs/fastjson-1.1.33.jar