Android Studio配置與使用Gson架構解析json資料

[toc]

這裡使用一個關聯的spinner來示範何如使用Gson解析json資料

一、配置gson環境

單擊Open Module Settings

單擊Dependencies，點選右邊的綠色加号

選擇選項的第一個Library Dependency

輸入GSON關鍵字，點選搜尋

這裡選擇一個合适的版本，然後點選OK

這時候gson架構就加載好了

二、安裝GSON插件

注意插件安裝完畢後請重新開機Android Studio

三、使用Gson插件生成Java Bean類

在src/main目錄下（與java和res同級的目錄下建立一個assets檔案夾）

在此檔案夾下複制一個地區編号的json檔案

百度雲下載下傳位址：http://pan.baidu.com/s/1hrRAeCO

再建立一個bean包

包下建立一個名為AddrBean的類

在此類檔案的任何位置右鍵

在彈出的對話框中将剛才下載下傳檔案的内容複制到這裡

注意，這裡自動生成的是中文的屬性名，為了友善使用，我們将屬性重命名

然後單擊下一步，一個Bean類就建立出來了

package com.doservlet.bean;

import com.google.gson.annotations.SerializedName;

import java.util.List;

/**
 * Created by 陳小默
 * http://my.oschina.net/oschenxiaomo/blog
 * http://blog.csdn.net/qq_32583189
 */
public class AddrBean {

    @SerializedName("城市代碼")
    private List<ProvinceBean> provinceList;

    public List<ProvinceBean> getProvinceList() {
        return provinceList;
    }

    public void setProvinceList(List<ProvinceBean> provinceList) {
        this.provinceList = provinceList;
    }

    public static class ProvinceBean {
        @SerializedName("省")
        private String province;
        /**
         * 市名 : 北京
         * 編碼 : 101010100
         */

        @SerializedName("市")
        private List<CityBean> cityList;

        public String getProvince() {
            return province;
        }

        public void setProvince(String province) {
            this.province = province;
        }

        public List<CityBean> getCityList() {
            return cityList;
        }

        public void setCityList(List<CityBean> cityList) {
            this.cityList = cityList;
        }

        public static class CityBean {
            @SerializedName("市名")
            private String cityName;
            @SerializedName("編碼")
            private String cityCode;

            public String getCityName() {
                return cityName;
            }

            public void setCityName(String cityName) {
                this.cityName = cityName;
            }

            public String getCityCode() {
                return cityCode;
            }

            public void setCityCode(String cityCode) {
                this.cityCode = cityCode;
            }
        }
    }
}
           

四、建立一個布局檔案

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context="com.doservlet.activity.WeatherActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <Spinner
            android:id="@+id/province_list"
            android:layout_width="0dp"
            android:layout_height="40dp"
            android:layout_weight="1"></Spinner>

        <Spinner
            android:id="@+id/city_list"
            android:layout_width="0dp"
            android:layout_height="40dp"
            android:layout_weight="1"></Spinner>
    </LinearLayout>
</LinearLayout>
           

五、為spinner建立擴充卡

顯示省份的擴充卡

package com.doservlet.adapter;

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

import com.doservlet.bean.AddrBean;

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

/**
 * Created by 陳小默
 */
public class ProvinceAdapter extends BaseAdapter {

    private Context context;

    public ProvinceAdapter(Context context) {
        this.context = context;
    }

    private List<AddrBean.ProvinceBean> provinceBeanList = new ArrayList<>();

    public void setProvinceBeanList(List<AddrBean.ProvinceBean> provinceBeanList) {
        this.provinceBeanList = provinceBeanList;
        notifyDataSetChanged();
    }

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

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

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        TextView tv = new TextView(context);
        tv.setText(provinceBeanList.get(position).getProvince());
        return tv;
    }
}
           

市的擴充卡

package com.doservlet.adapter;

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

import com.doservlet.bean.AddrBean;

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

/**
 * Created by 陳小默 on 2016/5/20.
 */
public class CityAdapter extends BaseAdapter {
    private Context context;
    private List<AddrBean.ProvinceBean.CityBean> cityBeanList = new ArrayList<>();

    public void setCityBeanList(List<AddrBean.ProvinceBean.CityBean> cityBeanList) {
        this.cityBeanList = cityBeanList;
        notifyDataSetChanged();
    }

    public CityAdapter(Context context) {
        this.context = context;
    }

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

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

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        TextView tv = new TextView(context);
        tv.setText(cityBeanList.get(position).getCityName());
        return tv;
    }
}
           

六、在Activity中解析資料

package com.doservlet.activity;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Spinner;

import com.doservlet.adapter.CityAdapter;
import com.doservlet.adapter.ProvinceAdapter;
import com.doservlet.bean.AddrBean;
import com.doservlet.bean.Weather;
import com.doservlet.xutilsdemo.R;
import com.google.gson.GsonBuilder;

import org.xutils.common.Callback;
import org.xutils.http.RequestParams;
import org.xutils.x;

import java.io.InputStream;
import java.io.InputStreamReader;

public class WeatherActivity extends AppCompatActivity {
    private Spinner spProvince, spCity;
    private AddrBean addrBean;
    private ProvinceAdapter adpProvince;
    private CityAdapter adpCity;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_weather);
        initView();
        loadData();
        register();
    }

    private void register() {
        spProvince.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                adpCity.setCityBeanList(addrBean.getProvinceList().get(position).getCityList());
            }

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

            }
        });
    }

    private void loadData() {
        try {
            InputStream inputStream = getApplicationContext().getAssets().open("addr_china.json");

            addrBean = new GsonBuilder().create().fromJson(new InputStreamReader(inputStream), AddrBean.class);

            spProvince.setAdapter(adpProvince);
            adpProvince.setProvinceBeanList(addrBean.getProvinceList());

            spCity.setAdapter(adpCity);
            adpCity.setCityBeanList(addrBean.getProvinceList().get().getCityList());
        } catch (Throwable e) {
            e.printStackTrace();
        }
    }

    private void initView() {
        spCity = (Spinner) findViewById(R.id.city_list);
        spProvince = (Spinner) findViewById(R.id.province_list);

        adpProvince = new ProvinceAdapter(this);
        adpCity = new CityAdapter(this);
    }
}
           

好了現在運作就能看到關聯的結果了

• Android Studio配置與使用Gson架構解析json資料
  • 一配置gson環境
  • 二安裝GSON插件
  • 三使用Gson插件生成Java Bean類
  • 四建立一個布局檔案
  • 五為spinner建立擴充卡
  • 六在Activity中解析資料