Gson的使用——Gson解析json数组并展示在ListView控件上
json
适用于现代 C++ 的 JSON。
项目地址：https://gitcode.com/gh_mirrors/js/json
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类似于解析json数据的框架有很多，常用的就是Gson，使用起来特别的方便，同时，还拥有很好的可操作性，今天就来说说怎么用Gson去解析一个json数组。使用Gson之前，需要下载一个gson.jar的jar包。具体的自己去网上下载，有很多。
首先看看数据源
{
"a": [
{
"numid": "1",
"name": "艾勇",
"abbreviation": "aiyong",
"photo": "/test/qingqixie/Public/Upload/niul7b2sdy.jpg"
},
{
"numid": "2",
"name": "安京哲",
"abbreviation": "anjingzhe",
"photo": "/test/qingqixie/Public/Upload/tfnc4pko7n11ul.jpg"
}
],
"b": [
{
"numid": "351",
"name": "白雪剑",
"abbreviation": "baixuejian",
"photo": "/test/qingqixie/Public/Upload/31dl12sfmjo.png"
},
{
"numid": "3",
"name": "白振亮",
"abbreviation": "baizhenliang",
"photo": "/test/qingqixie/Public/Upload/rrqixinqap.jpg"
},
{
"numid": "4",
"name": "毕伟",
"abbreviation": "biwei",
"photo": "/test/qingqixie/Public/Upload/7rhytjvhmg8q.jpg"
}
],
"c": [
{
"numid": "5",
"name": "曹恒海",
"abbreviation": "caohenghai",
"photo": "/test/qingqixie/Public/Upload/0iru1ef1w0k58.jpg"
},
{
"numid": "6",
"name": "曹润星",
"abbreviation": "caorunxing",
"photo": "/test/qingqixie/Public/Upload/mdk1rliogrk.jpg"
},
{
"numid": "377",
"name": "曹显龙",
"abbreviation": "caoxianlong",
"photo": ""
},
{
"numid": "447",
"name": "测试用户",
"abbreviation": "ceshiyonghu",
"photo": ""
},
{
"numid": "456",
"name": "测试专员",
"abbreviation": "ceshizhuanyuan",
"photo": ""
},
{
"numid": "7",
"name": "柴宁",
"abbreviation": "chaining",
"photo": "/test/qingqixie/Public/Upload/nqyrnb2gahql.jpg"
},
{
"numid": "8",
"name": "常传泉",
"abbreviation": "changchuanquan",
"photo": "/test/qingqixie/Public/Upload/rbbf5xpwn7a.jpg"
},
{
"numid": "453",
"name": "查芃",
"abbreviation": "chapeng",
"photo": ""
},
{
"numid": "13",
"name": "陈锴",
"abbreviation": "chen",
"photo": ""
},
{
"numid": "16",
"name": "陈琪",
"abbreviation": "chen",
"photo": "/test/qingqixie/Public/Upload/agogbyaf9tmfwjqf.jpg"
},
{
"numid": "10",
"name": "陈飞",
"abbreviation": "chenfei",
"photo": "/test/qingqixie/Public/Upload/pi6aa9p5q7envo2k.jpg"
},
{
"numid": "413",
"name": "成建新",
"abbreviation": "chengjianxin",
"photo": ""
},
{
"numid": "21",
"name": "程晟",
"abbreviation": "chengsheng",
"photo": "/test/qingqixie/Public/Upload/hkthw4jent6czg.jpg"
},
{
"numid": "22",
"name": "程树森",
"abbreviation": "chengshusen",
"photo": "/test/qingqixie/Public/Upload/kf7278h7t832u6.jpg"
},
{
"numid": "458",
"name": "程序员",
"abbreviation": "chengxuyuan",
"photo": ""
},
{
"numid": "11",
"name": "陈海滨",
"abbreviation": "chenhaibin",
"photo": ""
},
{
"numid": "432",
"name": "陈捷",
"abbreviation": "chenjie",
"photo": ""
},
{
"numid": "12",
"name": "陈津川",
"abbreviation": "chenjinchuan",
"photo": "/test/qingqixie/Public/Upload/59amjj1fe3f.jpg"
},
{
"numid": "14",
"name": "陈娜娜",
"abbreviation": "chennana",
"photo": "/test/qingqixie/Public/Upload/fq82mj0xpt.jpg"
},
{
"numid": "15",
"name": "陈鹏",
"abbreviation": "chenpeng",
"photo": ""
},
{
"numid": "17",
"name": "陈青溪",
"abbreviation": "chenqingxi",
"photo": "/test/qingqixie/Public/Upload/r9a3wtcf88b.jpg"
},
{
"numid": "19",
"name": "陈奕超",
"abbreviation": "chenyichao",
"photo": "/test/qingqixie/Public/Upload/izsp4r3yx.jpg"
},
{
"numid": "20",
"name": "陈宗敏",
"abbreviation": "chenzongmin",
"photo": "/test/qingqixie/Public/Upload/syewiyta6g42cv8.jpg"
},
{
"numid": "9",
"name": "车永超",
"abbreviation": "cheyongchao",
"photo": "/test/qingqixie/Public/Upload/sj68k9ope6r.jpg"
},
{
"numid": "23",
"name": "迟迅",
"abbreviation": "chixun",
"photo": ""
},
{
"numid": "24",
"name": "褚海涛",
"abbreviation": "chuhaitao",
"photo": "/test/qingqixie/Public/Upload/8bwltpuwf.jpg"
},
{
"numid": "26",
"name": "崔凤祥",
"abbreviation": "cuifengxiang",
"photo": "/test/qingqixie/Public/Upload/g48ihbkfd2itf43.jpg"
},
{
"numid": "27",
"name": "崔锦锋",
"abbreviation": "cuijinfeng",
"photo": ""
},
{
"numid": "28",
"name": "崔亚强",
"abbreviation": "cuiyaqiang",
"photo": "/test/qingqixie/Public/Upload/jcpfeegotnik1pp.jpg"
},
{
"numid": "397",
"name": "崔艺",
"abbreviation": "cuiyi",
"photo": "/test/qingqixie/Public/Upload/3kt4hrsm3qmfb5.jpg"
}
],
"d": [
{
"numid": "29",
"name": "戴新民",
"abbreviation": "daixinmin",
"photo": "/test/qingqixie/Public/Upload/vnndoq3rw8ekk.jpg"
},
{
"numid": "30",
"name": "邓丽",
"abbreviation": "dengli",
"photo": "/test/qingqixie/Public/Upload/hnow6jn58k.jpg"
},
{
"numid": "32",
"name": "丁炜",
"abbreviation": "dingwei",
"photo": "/test/qingqixie/Public/Upload/qt9tsrsied.jpg"
},
{
"numid": "440",
"name": "董梦石",
"abbreviation": "dongmengshi",
"photo": "/test/qingqixie/Public/Upload/r0vsa2w39xq07.png"
},
{
"numid": "33",
"name": "杜锴",
"abbreviation": "du",
"photo": "/test/qingqixie/Public/Upload/ytig406nljeyef.jpg"
},
{
"numid": "34",
"name": "段宝平",
"abbreviation": "duanbaoping",
"photo": "/test/qingqixie/Public/Upload/rv7az0zbo.jpg"
},
{
"numid": "35",
"name": "段海鹰",
"abbreviation": "duanhaiying",
"photo": "/test/qingqixie/Public/Upload/xbquyz6kmga28.jpg"
},
{
"numid": "36",
"name": "段江",
"abbreviation": "duanjiang",
"photo": ""
},
{
"numid": "403",
"name": "段炼",
"abbreviation": "duanlian",
"photo": "/test/qingqixie/Public/Upload/curi2er7ti.jpg"
},
{
"numid": "37",
"name": "段拓文",
"abbreviation": "duantuowen",
"photo": "/test/qingqixie/Public/Upload/jstsdb0afmu4xha.jpg"
}
]
}这个是一个比较具有代表性的json数据。先大体的分析一下数据，最外面的是一个json对象，里面有四个json数组。那么进行第一、步，先建立实体类，当然了，这么多的数据，不可能让我们一个个的去写，我们这里要引用一个工具，他会帮我生成实体类。
网址如下：http://www.bejson.com/json2javapojo/
这里为了方便，我就把这个数据放在了assets目录下，取名为text.txt 。
好了，数据源有了，实体类也建好了，那么就可以开始我们的编码了。首先是从assets取出数据，代码如下：
try {
String data;
InputStream is;
is=getResources().getAssets().open("text.txt");
byte[] b = new byte[is.available()];
is.read(b);
data = new String(b);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}这个data就是我们的json数据了，接下来就是实现解析的操作了。这里我写成了一个方法。具体代码如下：
/*
* 解析数据
*/
public void analysisData(String data) {
try {
// Type listType = new TypeToken<List<Root>>() {
// }.getType();
oList = new ArrayList<Map<String, Object>>();
List<Root> appinfos = new ArrayList<Root>();
Root depts = gson.fromJson(data, Root.class);
appinfos.add(depts);
for (int i = 0; i < appinfos.size(); i++) {
root = appinfos.get(i);
List<A> listA = new ArrayList<A>();
List<B> listB = new ArrayList<B>();
listA = root.getA();
for (int j = 0; j < listA.size(); j++) {
Map<String, Object> map = new HashMap<String, Object>();
a = listA.get(j);
map.put("name", a.getName());
map.put("photo", a.getPhoto());
oList.add(map);
}
listB = root.getB();
oList2 = new ArrayList<Map<String, Object>>();
for (int j = 0; j < listB.size(); j++) {
Map<String, Object> map = new HashMap<String, Object>();
b = listB.get(j);
map.put("name", b.getName());
map.put("photo", b.getPhoto());
oList2.add(map);
}
oList.addAll(oList2);
}
mListView.setAdapter(new MyAdapter(oList, this));
} catch (Exception e) {
e.printStackTrace();
}
}截止目前，这些数据就解析完成了。当然，可能看起来云里雾里，下面贴上所有的代码：
布局文件：activity_main.xml
<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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<ListView
android:id="@+id/listview"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</RelativeLayout>item.xml
<?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="5dip" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="姓名："
android:textSize="20sp" />
<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textSize="18sp" />
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="照片："
android:textSize="20sp" />
<TextView
android:id="@+id/photo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textSize="18sp" />
</LinearLayout>
</LinearLayout>1.MainActivity.java
public class MainActivity extends Activity {
private String data;
private Gson gson;
private Root root;
private A a;
private B b;
private ListView mListView;
private List<Map<String, Object>> oList;
private List<Map<String, Object>> oList2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mListView = (ListView) findViewById(R.id.listview);
gson = new Gson();
a = new A();
b = new B();
root = new Root();
try {
InputStream is = getResources().getAssets().open("text.txt");
byte[] b = new byte[is.available()];
is.read(b);
data = new String(b);
analysisData(data);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/*
* 解析数据
*/
public void analysisData(String data) {
try {
// Type listType = new TypeToken<List<Root>>() {
// }.getType();
oList = new ArrayList<Map<String, Object>>();
List<Root> appinfos = new ArrayList<Root>();
Root depts = gson.fromJson(data, Root.class);
appinfos.add(depts);
for (int i = 0; i < appinfos.size(); i++) {
root = appinfos.get(i);
List<A> listA = new ArrayList<A>();
List<B> listB = new ArrayList<B>();
listA = root.getA();
for (int j = 0; j < listA.size(); j++) {
Map<String, Object> map = new HashMap<String, Object>();
a = listA.get(j);
map.put("name", a.getName());
map.put("photo", a.getPhoto());
oList.add(map);
}
listB = root.getB();
oList2 = new ArrayList<Map<String, Object>>();
for (int j = 0; j < listB.size(); j++) {
Map<String, Object> map = new HashMap<String, Object>();
b = listB.get(j);
map.put("name", b.getName());
map.put("photo", b.getPhoto());
oList2.add(map);
}
oList.addAll(oList2);
}
mListView.setAdapter(new MyAdapter(oList, this));
} catch (Exception e) {
e.printStackTrace();
}
}
}实体类的代码如下：
A.java
public class A {
private String numid;
private String name;
private String abbreviation;
private String photo;
public void setNumid(String numid) {
this.numid = numid;
}
public String getNumid() {
return this.numid;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return this.name;
}
public void setAbbreviation(String abbreviation) {
this.abbreviation = abbreviation;
}
public String getAbbreviation() {
return this.abbreviation;
}
public void setPhoto(String photo) {
this.photo = photo;
}
public String getPhoto() {
return this.photo;
}
}B、C、D的跟A一样，就不再赘述了。
还有一个Roor.java:
public class Root {
private List<A> a;
private List<B> b;
private List<C> c;
private List<D> d;
public void setA(List<A> a) {
this.a = a;
}
public List<A> getA() {
return this.a;
}
public void setB(List<B> b) {
this.b = b;
}
public List<B> getB() {
return this.b;
}
public void setC(List<C> c) {
this.c = c;
}
public List<C> getC() {
return this.c;
}
public void setD(List<D> d) {
this.d = d;
}
public List<D> getD() {
return this.d;
}
}适配器代码：MAdapter.java
public class MyAdapter extends BaseAdapter {
private List<Map<String, Object>> roots;
private Context mContext;
private LayoutInflater inflater;
private Root root;
public MyAdapter(List<Map<String, Object>> roots, Context mContext) {
this.roots = roots;
this.mContext = mContext;
inflater = LayoutInflater.from(mContext);
}
@Override
public int getCount() {
return roots.size();
}
@Override
public Object getItem(int position) {
return roots.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
viewHonder honder = null;
if (convertView == null) {
convertView = inflater.inflate(R.layout.item, null);
honder = new viewHonder();
honder.mName = (TextView) convertView.findViewById(R.id.name);
honder.mPhoto = (TextView) convertView.findViewById(R.id.photo);
convertView.setTag(honder);
} else {
honder = (viewHonder) convertView.getTag();
}
Map<String, Object> map = new HashMap<String, Object>();
map = roots.get(position);
honder.mName.setText(map.get("name") + "");
honder.mPhoto.setText(map.get("photo") + "");
return convertView;
}
class viewHonder {
TextView mName;
TextView mPhoto;
}
}好了。这时候已经可以实现这个功能了。
GitHub 加速计划 / js / json
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适用于现代 C++ 的 JSON。
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