Android源码+Springboot服务器

https://download.csdn.net/download/xiaoxin0630/11106276

Android-获取json 、解析json、显示json、下拉列表、线程

总体UI的代码适配器重新封装

package dialog.com.binglian.ui;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.Spinner;
import android.widget.TextView;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import dialog.com.binglian.R;
import dialog.com.binglian.entity.Road;
import dialog.com.binglian.utils.JsonAdapter;


public class UrlActivity  extends AppCompatActivity {

    private Spinner spinner;

    private ListView listView;

    private BufferedReader bufferedReader;

    public List<Road> lists=null;

    private Button button;

    private JsonAdapter jsonAdapter;

    final String host="http://binglian066.natapp1.cc/hlv";

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_url);
        listView=(ListView) findViewById(R.id.lv_list1);
        spinner=(Spinner) findViewById(R.id.spinner);

        lists=new ArrayList<>();

        new Thread(new Runnable() {
            @Override
            public void run() {

                try {
                    parseJsonData(readParse(host));

                    System.out.println("dada:"+lists.get(1).getLukou());
                    for(Road news:lists){
                        Log.i("lukou:",news.getLukou());
                    }


                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }).start();

        //这里休眠是为了让子线程结束 lists才有值
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        System.out.println("dare1"+lists.get(1).getLukou());
        jsonAdapter=new JsonAdapter(this,lists);
        listView.setAdapter(jsonAdapter);



        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, final int position, long id) {
                button= findViewById(R.id.btn_paixu);
                button.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        //获取资源下的数组中的Spinner中order下的值
                        getResources().getStringArray(R.array.order);
                        getResources().getStringArray(R.array.order);
                        Log.d("233",""+getResources().getStringArray(R.array.order)[position]);
                    }
                });

            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });
    }


    /**
     * 从指定的URL中获取数组
     * @param urlPath
     * @return
     * @throws Exception
     */
    public static String readParse(String urlPath) throws Exception {
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        byte[] data = new byte[1024];
        int len = 0;
        URL url = new URL(urlPath);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        InputStream inStream = conn.getInputStream();
        while ((len = inStream.read(data)) != -1) {
            outStream.write(data, 0, len);
        }
        inStream.close();
        return new String(outStream.toByteArray());//通过out.Stream.toByteArray获取到写的数据
    }



    
    private void parseJsonData(String string){
        lists = new ArrayList<>();
        try {
            JSONArray jsonArray=new JSONArray(string);
            for(int i=0;i<jsonArray.length();i++){
                JSONObject jsonObject=jsonArray.getJSONObject(i);

                Road road = new Road();
                road.setLukou(jsonObject.getString("lukou"));
                road.setRed(jsonObject.getString("red"));
                road.setYellow(jsonObject.getString("yellwo"));
                road.setGreen(jsonObject.getString("green"));
                lists.add(road);
//                String lukou=jsonObject.getString("lukou");
//                String red=jsonObject.getString("red");
//                String yellwo=jsonObject.getString("yellwo");
//                String green=jsonObject.getString("green");
//                System.out.println("lukou:"+lukou+",red:"+red+",yellow:"+yellwo+",greend:"+green);
        }
            Log.i("Test", "OK,数据存储完成");
            Log.i("Test", "List长度为："+lists.size());

        } catch (JSONException e) {
            e.printStackTrace();
        }

    }


}

封装的适配器

package dialog.com.binglian.utils;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.List;

import dialog.com.binglian.R;
import dialog.com.binglian.entity.Road;

public class JsonAdapter  extends BaseAdapter {

    private List<Road> list;

    private Context context;

    private LayoutInflater inflater;


    public  JsonAdapter(Context context,List<Road> list){
        this.list=list;
        this.context=context;
        inflater=LayoutInflater.from(context);
    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int position) {
        return list.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {


        Holder holder=null;
        if(convertView ==null){
            convertView=inflater.inflate(R.layout.item,null);
            holder=new Holder(convertView);
            convertView.setTag(holder);
        }else{
            holder=(Holder) convertView.getTag();
        }

        Road road=list.get(position);
        holder.Rd.setText(road.getLukou());
        holder.red.setText(road.getRed());
        holder.yello.setText(road.getYellow());
        holder.green.setText(road.getGreen());

        return convertView;
    }

    class Holder{
        private TextView Rd,red,yello,green;

        public  Holder(View view){
            Rd=(TextView) view.findViewById(R.id.tv_road);
            red=(TextView) view.findViewById(R.id.tv_red);
            yello=(TextView) view.findViewById(R.id.tv_yellowlight);
            green=(TextView) view.findViewById(R.id.tv_greenlight);
        }
    }
}

json传过来的实体类

package dialog.com.binglian.entity;

public class Road {

    private String lukou;

    private String red;

    private String yellow;

    private String green;

    public String getLukou() {
        return lukou;
    }

    public void setLukou(String lukou) {
        this.lukou = lukou;
    }

    public String getRed() {
        return red;
    }

    public void setRed(String red) {
        this.red = red;
    }

    public String getYellow() {
        return yellow;
    }

    public void setYellow(String yellow) {
        this.yellow = yellow;
    }

    public String getGreen() {
        return green;
    }

    public void setGreen(String green) {
        this.green = green;
    }
}

<?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">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
    <Spinner
        android:id="@+id/spinner"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:entries="@array/order"/>
        <Button
            android:id="@+id/btn_paixu"
            android:layout_weight="1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="排序"/>

    </LinearLayout>
    <ListView
        android:id="@+id/lv_list1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1" />
</LinearLayout>

listView的item文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <TextView
                android:id="@+id/tv_road"
                android:layout_weight="1"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"

                android:text="路口"/>
            <TextView
                android:id="@+id/tv_red"
                android:layout_weight="1"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="红灯时长/s"/>
            <TextView
                android:id="@+id/tv_greenlight"
                android:layout_weight="1"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"

                android:text="绿灯时长/s"/>
            <TextView
                android:id="@+id/tv_yellowlight"
                android:layout_weight="1"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"

                android:text="黄灯时长/s"/>
        </LinearLayout>
</LinearLayout>

Spinner下拉内容 xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="order">
        <item>红灯将序</item>
        <item>绿灯将序</item>
    </string-array>
</resources>

首先需要获取json数据

json地址是自己写的一个springboot服务器，

当时试了很多获取的方法但是虽然能获取到解析不出来这就是一个问题

我这里使用了这个方法就可以解析到

/**
     * 从指定的URL中获取数组
     * @param urlPath
     * @return
     * @throws Exception
     */
    public static String readParse(String urlPath) throws Exception {
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        byte[] data = new byte[1024];
        int len = 0;
        URL url = new URL(urlPath);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        InputStream inStream = conn.getInputStream();
        while ((len = inStream.read(data)) != -1) {
            outStream.write(data, 0, len);
        }
        inStream.close();
        return new String(outStream.toByteArray());//通过out.Stream.toByteArray获取到写的数据
    }

解析json数据

获取传过来的数据进行解析

JsonArray 传到JSONArray

然后再用jsonArray.getJSONObject一一取出来

然后再给Road对象在添加到list中

private void parseJsonData(String string){
        lists = new ArrayList<>();
        try {
            JSONArray jsonArray=new JSONArray(string);
            for(int i=0;i<jsonArray.length();i++){
                JSONObject jsonObject=jsonArray.getJSONObject(i);

                Road road = new Road();
                road.setLukou(jsonObject.getString("lukou"));
                road.setRed(jsonObject.getString("red"));
                road.setYellow(jsonObject.getString("yellwo"));
                road.setGreen(jsonObject.getString("green"));
                lists.add(road);
//                String lukou=jsonObject.getString("lukou");
//                String red=jsonObject.getString("red");
//                String yellwo=jsonObject.getString("yellwo");
//                String green=jsonObject.getString("green");
//                System.out.println("lukou:"+lukou+",red:"+red+",yellow:"+yellwo+",greend:"+green);
        }
            Log.i("Test", "OK,数据存储完成");
            Log.i("Test", "List长度为："+lists.size());

        } catch (JSONException e) {
            e.printStackTrace();
        }

    }

然后这个是子线程中调用方法

parseJsonData(readParse(host));

这就是传递URL地址获取json数据然后解析数据

这里我当时因为没有学过Android的线程发现只要出了Thread list数据获取不到所需要需要把数据更新到主线程中

new Thread(new Runnable() {
            @Override
            public void run() {

                try {
                    parseJsonData(readParse(host));

                    System.out.println("dada:"+lists.get(1).getLukou());
                    for(Road news:lists){
                        Log.i("lukou:",news.getLukou());
                    }


                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }).start();

我这里用的是休眠的方法

然后我这里设置了设配器需要显示出来把list传递到自定义的适配器

        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }




        System.out.println("dare1"+lists.get(1).getLukou());
        jsonAdapter=new JsonAdapter(this,lists);
        listView.setAdapter(jsonAdapter);

自定义适配器

inflater=Layoutflater.from(context);

这里自定义构造方法传递参数进来

public JsonAdapter(Context context,List<Road> list){
        this.list=list;
        this.context=context;
        inflater=LayoutInflater.from(context);
    }

这里是判断是否第一次缓存运行

Holder holder=null;

if(convertView ==null){
            convertView=inflater.inflate(R.layout.item,null);
            holder=new Holder(convertView);
            convertView.setTag(holder);
        }else{
            holder=(Holder) convertView.getTag();
        }

package dialog.com.binglian.utils;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.List;

import dialog.com.binglian.R;
import dialog.com.binglian.entity.Road;

public class JsonAdapter  extends BaseAdapter {

    private List<Road> list;

    private Context context;

    private LayoutInflater inflater;


    public  JsonAdapter(Context context,List<Road> list){
        this.list=list;
        this.context=context;
        inflater=LayoutInflater.from(context);
    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int position) {
        return list.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {


        Holder holder=null;
        if(convertView ==null){
            convertView=inflater.inflate(R.layout.item,null);
            holder=new Holder(convertView);
            convertView.setTag(holder);
        }else{
            holder=(Holder) convertView.getTag();
        }

        Road road=list.get(position);
        holder.Rd.setText(road.getLukou());
        holder.red.setText(road.getRed());
        holder.yello.setText(road.getYellow());
        holder.green.setText(road.getGreen());

        return convertView;
    }

    class Holder{
        private TextView Rd,red,yello,green;

        public  Holder(View view){
            Rd=(TextView) view.findViewById(R.id.tv_road);
            red=(TextView) view.findViewById(R.id.tv_red);
            yello=(TextView) view.findViewById(R.id.tv_yellowlight);
            green=(TextView) view.findViewById(R.id.tv_greenlight);
        }
    }
}

下拉列表

监听事件

spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, final int position, long id) {
                button= findViewById(R.id.btn_paixu);
                button.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        getResources().getStringArray(R.array.order);
                        getResources().getStringArray(R.array.order);
                        Log.d("233",""+getResources().getStringArray(R.array.order)[position]);
                    }
                });

            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });